Merge pull request #373 from adafruit/add-issue-template

add issue template

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -0,0 +1,95 @@
+name: Bug Report
+description: Report a problem
+labels: 'Bug'
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this bug report!
+        It's okay to leave some blank if it doesn't apply to your problem.
+
+  - type: dropdown
+    attributes:
+      label: Operating System
+      options:
+              - Linux
+              - MacOS
+              - RaspberryPi OS
+              - Windows 7
+              - Windows 10
+              - Windows 11
+              - Others
+    validations:
+      required: true
+
+  - type: input
+    attributes:
+      label: Arduino IDE version
+      placeholder: e.g Arduino 1.8.15
+    validations:
+      required: true
+
+  - type: input
+    attributes:
+      label: Board
+      placeholder: e.g Metro M4 Express
+    validations:
+      required: true
+      
+  - type: input
+    attributes:
+      label: ArduinoCore version
+      description: Can be found under "Board Manager" menu
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Sketch as ATTACHED TXT
+      placeholder: |
+        e.g examples/MassStorage/msc_ramdisk.
+        If it is custom sketch, please provide it as **ATTACHED** files or link to it.
+        Pasting raw long code that hurts readability can get your issue **closed**
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Compiled Log as ATTACHED TXT
+      placeholder: |
+        Compiled log from Arduino IDE as **ATTACHED** txt.
+        Pasting raw long log that hurts readability can get your issue **closed**
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: What happened ?
+      placeholder: A clear and concise description of what the bug is.
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: How to reproduce ?
+      placeholder: |
+        1. Go to '...'
+        2. Click on '....'
+        3. See error      
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Debug Log as ATTACHED TXT
+      placeholder: |
+        Debug log where the issue occurred as attached txt file, best with comments to explain the actual events.
+    validations:
+      required: false
+
+  - type: textarea
+    attributes:
+      label: Screenshots
+      description: If applicable, add screenshots to help explain your problem.
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,5 @@
+blank_issues_enabled: false
+contact_links:
+  - name: Adafruit Support Forum
+    url: https://forums.adafruit.com
+    about: If you have other questions or need help, post it here.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,20 @@
+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: Feature
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/workflows/githubci.yml

@@ -0,0 +1,61 @@
+name: Build
+
+on: [pull_request, push]
+
+jobs:
+  build:
+    strategy:
+      fail-fast: false
+      matrix:
+        board:
+          # Alphabetical order
+          - 'circuitplayground_m0'
+          - 'feather_m4_can'
+          - 'hallowing'
+          - 'hallowing_m4'
+          - 'metro_m0'
+          - 'metro_m4'
+          - 'pybadge_m4'
+          - 'pygamer_m4'
+          - 'pyportal_m4'
+          - 'pyportal_m4_titano'
+          # with TinyUSB
+          - 'metro_m0:usbstack=tinyusb'
+          - 'metro_m4:speed=120,usbstack=tinyusb'
+
+    runs-on: ubuntu-latest
+    
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+      with:
+        submodules: 'true'
+
+    - name: Install Arduino CLI and Tools
+      run: |
+        # make all our directories we need for files and libraries
+        mkdir $HOME/.arduino15
+        mkdir $HOME/.arduino15/packages
+        mkdir $HOME/Arduino
+        mkdir $HOME/Arduino/libraries
+        curl -fsSL https://raw.githubusercontent.com/arduino/arduino-cli/master/install.sh | sh
+        echo "$GITHUB_WORKSPACE/bin" >> $GITHUB_PATH
+        
+    - name: Install BSP and Libraries
+      env:
+        BSP_URL: https://adafruit.github.io/arduino-board-index/package_adafruit_index.json
+        BSP_PATH: .arduino15/packages/adafruit/hardware/samd
+      run: |
+        arduino-cli config init
+        arduino-cli core update-index
+        arduino-cli core update-index --additional-urls $BSP_URL        
+        arduino-cli core install arduino:samd --additional-urls $BSP_URL
+        arduino-cli core install adafruit:samd --additional-urls $BSP_URL
+        # Replace release BSP with our code
+        BSP_VERSION=`eval ls $HOME/$BSP_PATH`
+        rm -r $HOME/$BSP_PATH/*
+        ln -s $GITHUB_WORKSPACE $HOME/$BSP_PATH/$BSP_VERSION
+        arduino-cli lib install "Adafruit NeoPixel" "Adafruit seesaw Library" "Adafruit SPIFlash" "FlashStorage" "MIDI Library" "SD" "SdFat - Adafruit Fork"
+
+    - name: Build examples
+      run: python3 tools/build_all.py ${{ matrix.board }}

.gitignore

@@ -3,3 +3,4 @@
 
 bootloaders/*/build/
 *~
+/libraries/**/build/

.gitmodules

@@ -0,0 +1,6 @@
+[submodule "libraries/Adafruit_TinyUSB_Arduino"]
+	path = libraries/Adafruit_TinyUSB_Arduino
+	url = https://github.com/adafruit/Adafruit_TinyUSB_Arduino.git
+[submodule "libraries/Adafruit_ZeroDMA"]
+	path = libraries/Adafruit_ZeroDMA
+	url = https://github.com/adafruit/Adafruit_ZeroDMA

CHANGELOG

@@ -1,3 +1,83 @@
+SAMD CORE ?.?.?? ????.??.??
+
+SAMD CORE 1.6.21 2019.04.01
+
+* MKR boards: changed I2C to sercom2, SPI1 + Serial2 to sercom4
+* Improved accuracy of delay() function. Thanks @BenF
+* MKR 1500: Changed SARA module to be powered off on boot
+
+SAMD CORE 1.6.20 2018.11.28
+
+* Replaced boolean type with bool in examples. Thanks @per1234
+* Added c++ linker command to allow to include libstdc++ when linking. Thanks @helmut64
+* CPX driver fixes. Thanks @dhalbert
+* I2S: Changed library to use 8 MHz oscillator source if 48MHz divider does not fit in 8 bits
+* UART: Added frame error handling
+* USB: Fixed memory leak on reconnects
+* SDU: Added support for Arduino M0. Thanks @jandrassy
+* Added arduinoOTA upload keys for Arduino M0. Thanks @jandrassy
+* USB: Fixed USB Host failures and fixed memory overwrite in USBHost. Thanks @gdsports
+* USB: Added method to return USB error code. Thanks @MarkFischer
+* CDC: Clear line state on end()
+* USB: Added USB device end() method
+* Removed requirement that the DAC is on A0. Thanks @GabrielNotman
+* Added alternate ports 44, 45 to make the SWCLK and SWDIO pins available on the Zero. Thanks @helmut64
+* Added defines for MKR pin layout
+* Fixed freeze in tone()
+* Added MKR NB 1500 variant and bootloader
+* Increased the default serial buffer size to 256
+
+SAMD CORE 1.6.19 2018.07.11
+
+* Fixed bootloader tools for .org boards
+* M0: Updated pin definitions for D6, D7 and D13 to match Zero
+* SPI: Fixed interrupt mask to block. Thanks @ggajoch
+* Added MKR WiFi 1010 variant and bootloader
+* Updated Windows Drivers to 1.4.0 and re-signed Adafruit_Circuit_Playground_Express.inf
+
+SAMD CORE 1.6.18 2018.03.05
+
+* Wire: Added support for general call (broadcast)
+* SPI: Added SPI.notUsingInterrupt(...) API
+* Fixed build errors if variant disabled USB
+* Wire: TX and RX buffers are now 256 bytes (previously was 64 bytes)
+* Added samd21e sercom compatibility. Thanks @mitchellpontague
+* Fixed lock ups when outputting to UART during ISR
+* Wire: correct I2C frequency calculations, and allow variant to overide default pull up resistor rise time
+* USB: Fixed build errors when CDC_ENABLED was not set. Thanks @gdsports
+
+SAMD CORE 1.6.17 2017.11.29
+
+* More accurate approximation for multiplication factor of PLL to make 48Mhz. Thanks @joverbee
+* Fix changing trigger mode (RISING/FALLING/...) in attachInterrupt(..) during runtime. Thanks @joverbee
+* Improved ISR response time. Thanks @joverbee
+* USB power current can now be overridden in the variant. Thanks @awatterott
+* UART's now support optional RTS and CTS pins defined in the variant.
+* Added support for MKR GSM 1400 and MKR WAN 1300
+
+SAMD CORE 1.6.16 2017.08.23
+
+* Is now possible to use PWM on D7 (though it can't be used with PWM on D12 at the same time). Thanks @Adminius
+* PWMs now can perform real 16-bit resolution if analogWriteResolution(16) is set. Thanks @Adminius
+* USB CDC: fixed issue of available() getting stuck when receiving ZLP's
+* Serial (UART) tx is now buffered.
+* Improved CRYSTALLESS stability. Thanks @tannewt
+* Some fixes to Adafruit Circuit Playground Express variant. Thanks @ladyada
+* Updated Stream and Print class
+* Native USB now supports USB Serial Number
+* Fixed pgm_read_ptr compatibility macro. Thanks @nkrkv
+
+SAMD CORE 1.6.15 2017.04.27
+
+* Added missing Windows driver for MKRFox1200
+* Added SDU support for MKRFox1200
+
+SAMD CORE 1.6.14 2017.04.04
+
+* Fixed platform definition for openocd
+* Added bootloader definitions for MKRFox1200
+* Added lowpower function on USB subsystem
+
 SAMD CORE 1.6.13 2017.03.31
 
 * Added SDU (SD card Updater) library.

README.md

@@ -1,43 +1,14 @@
 # Arduino Core for SAMD21 and SAMD51 CPU
 
+[![Build Status](https://github.com/adafruit/ArduinoCore-samd/workflows/Build/badge.svg)](https://github.com/adafruit/ArduinoCore-samd/actions)
+
 This repository contains the source code and configuration files of the Arduino Core
 for Atmel's SAMD21 and SAMD51 processor (used on the Arduino/Genuino Zero, MKR1000 and MKRZero boards).
 
 In particular, this adds support for the Adafruit SAMD Boards such as the Feather M0
 
-## ATSAMD51 Installation on Arduino IDE
-
-The ATSAMD51 is a significantly new chip, so this is a detailed process for now! For the SAMD21, please install via the board manager (no extra steps required)
-
-1. Install Arduino IDE 1.8.5 or greater
-2. Install/update the Adafruit SAMD board support package if you have installed it
-3. Now we need to update CMSIS! Download https://github.com/adafruit/ArduinoModule-CMSIS-Atmel/archive/master.zip and unzip
-4. Find your Arduino CMSIS, in Mac its "~/Library/Arduino15/packages/arduino/tools/CMSIS-Atmel/1.1.0/CMSIS" version # may vary, you'll need "Go to folder..." feature in the Finder to get to " ~/Library/Arduino15" as it is hidden. In Windows it is "C:\Users\yourusername\AppData\Local\Arduino15\packages\arduino\tools\CMSIS-Atmel\1.1.0\CMSIS" Inside is a folder named Device
-
-For Linux: the Arduino stuff is located in ~/.arduino15/packages/arduino/tools/CMSIS-Atmel/1.1.0/CMSIS
-
-5. Inside the downloaded CMSIS zip, go into the CMSIS-Atmel/CMSIS folder, you should see a folder named Device. *DRAG THE DEVICE FOLDER ONLY* from the zip to your arduino Library folder so that Device is merged with Device. It will replace a bunch of files.
-
-For Linux, it may be better to just delete the original Device Folder then copy over the new one - the drag/drop worked ok on MACOS, but not so well on my Linux box.  
-
-6. You will also need to replace bossac. For Windows or Mac: Go here https://github.com/adafruit/BOSSA/releases and download either windows exe or mac app of latest bossac. unzip.  Go to Step 12.
-
-For Linux users it is best to build a copy of bossac locally - 
-clone the Adafruit Repostitory to somewhere on your local machine.
-```
-git clone https://github.com/adafruit/BOSSA.git
-change to the arduino branch
-git checkout arduino
-```
-Follow the instructions to build bossac in README.md or at https://github.com/adafruit/BOSSA/tree/arduino.
-
-7. Replace the binary at ".../Library/Arduino15/packages/arduino/tools/bossac/1.7.0/bossac" or "...\AppData\Local\Arduino15\packages\arduino\tools\bossac\1.7.0\bossac"
-8. On Windows 7 you will also need to install the updated serial driver, download https://github.com/adafruit/Adafruit_Windows_Drivers/archive/master.zip to get all the drivers, and point the Device Manager to the unzipped folder. It isn't signed, so just approve the installation manually.
-13. That's it!
-
 ## Bugs or Issues
 
-## Known Issues for SAMD51:
 * AREF must be tied to 3.3V for dac to work. This is a bug in the SAMD51 silicon.
 * USB host mode doesn't work yet
 

bootloaders/metroM4/METRO_M4_sam_ba.hex

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bootloaders/metroM4/Makefile

@@ -0,0 +1,165 @@
+# Copyright (c) 2015 Atmel Corporation/Thibaut VIARD.  All right reserved.
+# Copyright (c) 2015 Arduino LLC.  All right reserved.
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# See the GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+# -----------------------------------------------------------------------------
+# Paths
+ifeq ($(OS),Windows_NT)
+  # Are we using mingw/msys/msys2/cygwin?
+  ifeq ($(TERM),xterm)
+    T=$(shell cygpath -u $(LOCALAPPDATA))
+    MODULE_PATH?=$(T)/Arduino15/packages/arduino
+    RM=rm
+    SEP=/
+  else
+    MODULE_PATH?=$(LOCALAPPDATA)/Arduino15/packages/arduino
+    RM=rm
+    SEP=\\
+  endif
+else
+  UNAME_S := $(shell uname -s)
+
+  ifeq ($(UNAME_S),Linux)
+    MODULE_PATH?=$(HOME)/.arduino15/packages/arduino
+    RM=rm
+    SEP=/
+  endif
+
+  ifeq ($(UNAME_S),Darwin)
+    MODULE_PATH?=$(HOME)/Library/Arduino15/packages/arduino/
+    RM=rm
+    SEP=/
+  endif
+endif
+
+ARM_GCC_PATH?=$(MODULE_PATH)/tools/arm-none-eabi-gcc/4.8.3-2014q1/bin/arm-none-eabi-
+BUILD_PATH=build
+
+# -----------------------------------------------------------------------------
+# Tools
+CC=$(ARM_GCC_PATH)gcc
+OBJCOPY=$(ARM_GCC_PATH)objcopy
+NM=$(ARM_GCC_PATH)nm
+SIZE=$(ARM_GCC_PATH)size
+
+# -----------------------------------------------------------------------------
+# Compiler options
+CFLAGS_EXTRA=-D$(BOARD_CHIP) -DBOARD_ID_$(BOARD_ID)
+CFLAGS=-mthumb -mcpu=cortex-m4 -c -std=gnu99 -MD -MP -MF "$(@:%.o=%.d)" -MT"$(@:%.o=%.d)" -MT"$(@:%.o=%.o)" -ffunction-sections -fdata-sections -nostdlib -nostartfiles --param max-inline-insns-single=500
+ifdef DEBUG
+  CFLAGS+=-g3 -O1 -DDEBUG=1
+else
+  CFLAGS+=-Os -DDEBUG=0
+endif
+
+ELF=$(BOARD_ID)_sam_ba.elf
+BIN=$(BOARD_ID)_sam_ba.bin
+HEX=$(BOARD_ID)_sam_ba.hex
+
+
+INCLUDES=-I"$(MODULE_PATH)/tools/CMSIS/4.5.0/CMSIS/Include/" -I"$(MODULE_PATH)/tools/CMSIS-Atmel/1.1.0/CMSIS/Device/ATMEL/"
+
+# -----------------------------------------------------------------------------
+# Linker options
+LDFLAGS=-mthumb -mcpu=cortex-m4 -Wall -Wl,--cref -Wl,--check-sections -Wl,--gc-sections -Wl,--unresolved-symbols=report-all
+LDFLAGS+=-Wl,--warn-common -Wl,--warn-section-align -Wl,--warn-unresolved-symbols --specs=nano.specs --specs=nosys.specs
+
+# -----------------------------------------------------------------------------
+# Source files and objects
+SOURCES= \
+  board_driver_led.c \
+  board_driver_serial.c \
+  board_driver_usb.c \
+  board_init.c \
+  board_startup.c \
+  main.c \
+  sam_ba_usb.c \
+  sam_ba_cdc.c \
+  sam_ba_monitor.c \
+  sam_ba_serial.c
+
+OBJECTS=$(addprefix $(BUILD_PATH)/, $(SOURCES:.c=.o))
+DEPS=$(addprefix $(BUILD_PATH)/, $(SOURCES:.c=.d))
+
+ifneq "test$(AVRSTUDIO_EXE_PATH)" "test"
+  AS_BUILD=copy_for_atmel_studio
+  AS_CLEAN=clean_for_atmel_studio
+else
+  AS_BUILD=
+  AS_CLEAN=
+endif
+
+
+all: print_info $(SOURCES) $(BIN) $(HEX) $(AS_BUILD)
+
+$(ELF): Makefile $(BUILD_PATH) $(OBJECTS)
+	@echo ----------------------------------------------------------
+	@echo Creating ELF binary
+	"$(CC)" -L. -L$(BUILD_PATH) $(LDFLAGS) -Os -Wl,--gc-sections -save-temps -Tbootloader_$(BOARD_ID).ld -Wl,-Map,"$(BUILD_PATH)/$(NAME).map" -o "$(BUILD_PATH)/$(ELF)" -Wl,--start-group $(OBJECTS) -lm -Wl,--end-group
+	"$(NM)" "$(BUILD_PATH)/$(ELF)" >"$(BUILD_PATH)/$(NAME)_symbols.txt"
+	"$(SIZE)" --format=sysv -t -x $(BUILD_PATH)/$(ELF)
+
+$(BIN): $(ELF)
+	@echo ----------------------------------------------------------
+	@echo Creating flash binary
+	"$(OBJCOPY)" -O binary $(BUILD_PATH)/$< $@
+
+$(HEX): $(ELF)
+	@echo ----------------------------------------------------------
+	@echo Creating flash binary
+	"$(OBJCOPY)" -O ihex $(BUILD_PATH)/$< $@
+
+$(BUILD_PATH)/%.o: %.c
+	@echo ----------------------------------------------------------
+	@echo Compiling $< to $@
+	"$(CC)" $(CFLAGS) $(CFLAGS_EXTRA) $(INCLUDES) $< -o $@
+	@echo ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+
+$(BUILD_PATH):
+	@echo ----------------------------------------------------------
+	@echo Creating build folder
+	-mkdir $(BUILD_PATH)
+
+print_info:
+	@echo ----------------------------------------------------------
+	@echo Compiling bootloader using
+	@echo BASE PATH = $(MODULE_PATH)
+	@echo GCC  PATH = $(ARM_GCC_PATH)
+#	@echo OS        = $(OS)
+#	@echo SHELL     = $(SHELL)
+#	@echo TERM      = $(TERM)
+#	"$(CC)" -v
+#	env
+
+copy_for_atmel_studio: $(BIN) $(HEX)
+	@echo ----------------------------------------------------------
+	@echo Atmel Studio detected, copying ELF to project root for debug
+	cp $(BUILD_PATH)/$(ELF) .
+
+clean_for_atmel_studio:
+	@echo ----------------------------------------------------------
+	@echo Atmel Studio detected, cleaning ELF from project root
+	-$(RM) ./$(ELF)
+
+clean: $(AS_CLEAN)
+	@echo ----------------------------------------------------------
+	@echo Cleaning project
+	-$(RM) $(BIN)
+	-$(RM) $(HEX)
+	-$(RM) $(BUILD_PATH)/*.*
+	-rmdir $(BUILD_PATH)
+
+.phony: print_info $(BUILD_PATH)

bootloaders/metroM4/README.md

@@ -0,0 +1,86 @@
+# Metro M4 Bootloader
+
+## 1- Prerequisites
+
+The project build is based on Makefile system.
+Makefile is present at project root and try to handle multi-platform cases.
+
+Multi-plaform GCC is provided by ARM here: https://launchpad.net/gcc-arm-embedded/+download
+
+Atmel Studio contains both make and ARM GCC toolchain. You don't need to install them in this specific use case.
+
+### Windows
+
+* Native command line
+Make binary can be obtained here: http://gnuwin32.sourceforge.net/packages/make.htm
+
+* Cygwin/MSys/MSys2/Babun/etc...
+It is available natively in all distributions.
+
+* Atmel Studio
+An Atmel Studio **7** Makefile-based project is present at project root, just open samd21_sam_ba.atsln file in AS7.
+
+### Linux
+
+Make is usually available by default.
+
+### OS X
+
+Make is available through XCode package.
+
+
+## 2- Selecting available SAM-BA interfaces
+
+By default both USB and UART are made available, but this parameter can be modified in sam_ba_monitor.h, line 31:
+
+Set the define SAM_BA_INTERFACE to
+* SAM_BA_UART_ONLY for only UART interface
+* SAM_BA_USBCDC_ONLY for only USB CDC interface
+* SAM_BA_BOTH_INTERFACES for enabling both the interfaces
+
+## 3- Behaviour
+
+This bootloader implements the double-tap on Reset button.
+By quickly pressing this button two times, the board will reset and stay in bootloader, waiting for communication on either USB or USART.
+
+The USB port in use is the USB Native port, close to the Reset button.
+
+The USART in use is the one available on pins D0/D1, labelled respectively RX/TX. Communication parameters are a baudrate at 115200, 8bits of data, no parity and 1 stop bit (8N1).
+
+## 4- Description
+
+**Pinmap**
+
+The following pins are used by the program :
+PA25 : input/output (USB DP)
+PA24 : input/output (USB DM)
+
+PA23 : input (USART RX)
+PA22 : output (USART TX)
+
+The application board shall avoid driving the PA25, PA24, PB23 and PB22 signals while the boot program is running (after a POR for example).
+
+**Clock system**
+
+CPU runs at 48MHz from Generic Clock Generator 0 on DFLL48M.
+
+Generic Clock Generator 1 is using external 32kHz oscillator and is the source of DFLL48M.
+
+USB and USART are using Generic Clock Generator 0 also.
+
+**Memory Mapping**
+
+Bootloader code will be located at 0x0 and executed before any applicative code.
+
+Applications compiled to be executed along with the bootloader will start at 0x2000 (see linker script bootloader_samdx1.ld).
+
+Before jumping to the application, the bootloader changes the VTOR register to use the interrupt vectors of the application @0x2000.<- not required as application code is taking care of this.
+
+## 5- How to build
+
+If not specified the makefile builds for **Metro M4**:
+
+```
+make
+```
+

bootloaders/metroM4/board_definitions.h

@@ -0,0 +1,32 @@
+/*
+  Copyright (c) 2015 Arduino LLC.  All right reserved.
+  Copyright (c) 2015 Atmel Corporation/Thibaut VIARD.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#if defined(BOARD_ID_METRO_M4)
+	#include "board_definitions_metro_m4.h"
+#elif defined(BOARD_ID_FEATHER_M4)
+	#include "board_definitions_feather_m4.h"
+#else
+  #error You must define a BOARD_ID and add the corresponding definitions in board_definitions.h
+#endif
+
+// Common definitions
+// ------------------
+
+#define BOOT_PIN_MASK (1U << (BOOT_LOAD_PIN & 0x1f))
+

bootloaders/metroM4/board_definitions_feather_m4.h

@@ -0,0 +1,82 @@
+/*
+  Copyright (c) 2015 Arduino LLC.  All right reserved.
+  Copyright (c) 2015 Atmel Corporation/Thibaut VIARD.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#ifndef _BOARD_DEFINITIONS_H_
+#define _BOARD_DEFINITIONS_H_
+
+/*
+ * USB device definitions
+ */
+#define STRING_PRODUCT "Feather M4"
+#define USB_VID_HIGH   0x23
+#define USB_VID_LOW    0x9A
+#define USB_PID_HIGH   0x00
+#define USB_PID_LOW    0x22
+
+/*
+ * If BOOT_DOUBLE_TAP_ADDRESS is defined the bootloader is started by
+ * quickly tapping two times on the reset button.
+ * BOOT_DOUBLE_TAP_ADDRESS must point to a free SRAM cell that must not
+ * be touched from the loaded application.
+ */
+#define BOOT_DOUBLE_TAP_ADDRESS           (HSRAM_ADDR + HSRAM_SIZE - 4)
+#define BOOT_DOUBLE_TAP_DATA              (*((volatile uint32_t *)BOOT_DOUBLE_TAP_ADDRESS))
+
+/*
+ * If BOOT_LOAD_PIN is defined the bootloader is started if the selected
+ * pin is tied LOW.
+ */
+//#define BOOT_LOAD_PIN                     PIN_PA21 // Pin 7
+//#define BOOT_LOAD_PIN                     PIN_PA15 // Pin 5
+
+#define GPIO(port, pin) ((((port)&0x7u) << 5) + ((pin)&0x1Fu))
+
+#define BOOK_USART_MASK					  APBAMASK
+#define BOOT_USART_MODULE                 SERCOM0
+#define BOOT_USART_BUS_CLOCK_INDEX        MCLK_APBAMASK_SERCOM0
+#define BOOT_GCLK_ID_CORE				  SERCOM0_GCLK_ID_CORE
+#define BOOT_GCLK_ID_SLOW				  SERCOM0_GCLK_ID_SLOW
+#define BOOT_USART_PAD_SETTINGS           UART_RX_PAD3_TX_PAD2
+#define BOOT_USART_PAD3                   PINMUX_UNUSED
+#define BOOT_USART_PAD2                   PINMUX_UNUSED
+
+#define BOOT_USART_PAD1                   PINMUX_PA10C_SERCOM0_PAD2
+#define BOOT_USART_PAD0                   PINMUX_PA11C_SERCOM0_PAD3
+
+/* Master clock frequency */
+#define CPU_FREQUENCY                     (48000000ul)
+#define VARIANT_MCK                       CPU_FREQUENCY
+
+/* Frequency of the board main oscillator */
+#define VARIANT_MAINOSC                   (32768ul)
+
+/* Calibration values for DFLL48 pll */
+#define NVM_SW_CALIB_DFLL48M_COARSE_VAL   (58)
+#define NVM_SW_CALIB_DFLL48M_FINE_VAL     (64)
+
+#define BOARD_LED_PORT                    (0)
+#define BOARD_LED_PIN                     (17)
+
+#define BOARD_LEDRX_PORT                  (1)
+#define BOARD_LEDRX_PIN                   (3)
+
+#define BOARD_LEDTX_PORT                  (0)
+#define BOARD_LEDTX_PIN                   (27)
+
+#endif // _BOARD_DEFINITIONS_H_

bootloaders/metroM4/board_definitions_metro_m4.h

@@ -0,0 +1,82 @@
+/*
+  Copyright (c) 2015 Arduino LLC.  All right reserved.
+  Copyright (c) 2015 Atmel Corporation/Thibaut VIARD.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#ifndef _BOARD_DEFINITIONS_H_
+#define _BOARD_DEFINITIONS_H_
+/*
+ * USB device definitions
+ */
+#define STRING_PRODUCT "Metro M4"
+#define USB_VID_HIGH   0x23
+#define USB_VID_LOW    0x9A
+#define USB_PID_HIGH   0x00
+#define USB_PID_LOW    0x20
+
+
+/*
+ * If BOOT_DOUBLE_TAP_ADDRESS is defined the bootloader is started by
+ * quickly tapping two times on the reset button.
+ * BOOT_DOUBLE_TAP_ADDRESS must point to a free SRAM cell that must not
+ * be touched from the loaded application.
+ */
+#define BOOT_DOUBLE_TAP_ADDRESS           (HSRAM_ADDR + HSRAM_SIZE - 4)
+#define BOOT_DOUBLE_TAP_DATA              (*((volatile uint32_t *)BOOT_DOUBLE_TAP_ADDRESS))
+
+/*
+ * If BOOT_LOAD_PIN is defined the bootloader is started if the selected
+ * pin is tied LOW.
+ */
+//#define BOOT_LOAD_PIN                     PIN_PA21 // Pin 7
+//#define BOOT_LOAD_PIN                     PIN_PA15 // Pin 5
+
+#define GPIO(port, pin) ((((port)&0x7u) << 5) + ((pin)&0x1Fu))
+
+#define BOOK_USART_MASK					  APBAMASK
+#define BOOT_USART_MODULE                 SERCOM0
+#define BOOT_USART_BUS_CLOCK_INDEX        MCLK_APBAMASK_SERCOM0
+#define BOOT_GCLK_ID_CORE				  SERCOM0_GCLK_ID_CORE
+#define BOOT_GCLK_ID_SLOW				  SERCOM0_GCLK_ID_SLOW
+#define BOOT_USART_PAD_SETTINGS           UART_RX_PAD3_TX_PAD2
+#define BOOT_USART_PAD3                   PINMUX_UNUSED
+#define BOOT_USART_PAD2                   PINMUX_UNUSED
+
+#define BOOT_USART_PAD1                   PINMUX_PA10C_SERCOM0_PAD2
+#define BOOT_USART_PAD0                   PINMUX_PA11C_SERCOM0_PAD3
+
+/* Master clock frequency */
+#define CPU_FREQUENCY                     (48000000ul)
+#define VARIANT_MCK                       CPU_FREQUENCY
+
+/* Frequency of the board main oscillator */
+#define VARIANT_MAINOSC                   (32768ul)
+
+/* Calibration values for DFLL48 pll */
+#define NVM_SW_CALIB_DFLL48M_COARSE_VAL   (58)
+#define NVM_SW_CALIB_DFLL48M_FINE_VAL     (64)
+
+#define BOARD_LED_PORT                    (0)
+#define BOARD_LED_PIN                     (21)
+
+#define BOARD_LEDRX_PORT                  (1)
+#define BOARD_LEDRX_PIN                   (6)
+
+#define BOARD_LEDTX_PORT                  (0)
+#define BOARD_LEDTX_PIN                   (27)
+
+#endif // _BOARD_DEFINITIONS_H_

bootloaders/metroM4/board_driver_led.c

@@ -0,0 +1,42 @@
+/*
+  Copyright (c) 2015 Arduino LLC.  All right reserved.
+  Copyright (c) 2015 Atmel Corporation/Thibaut VIARD.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#include "board_driver_led.h"
+
+volatile uint8_t ledKeepValue = 0;
+volatile uint8_t ledTargetValue = 20;
+volatile int8_t ledDirection = 1;
+
+inline void LED_pulse()
+{
+  if (ledKeepValue == 0) {
+    ledTargetValue += ledDirection;
+    LED_toggle();
+  }
+  ledKeepValue ++;
+
+  if (ledTargetValue > 240 || ledTargetValue < 10) {
+    ledDirection = -ledDirection;
+    ledTargetValue += ledDirection;
+  }
+
+  if (ledKeepValue == ledTargetValue) {
+    LED_toggle();
+  }
+}

bootloaders/metroM4/board_driver_led.h

@@ -0,0 +1,63 @@
+/*
+  Copyright (c) 2015 Arduino LLC.  All right reserved.
+  Copyright (c) 2015 Atmel Corporation/Thibaut VIARD.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#ifndef _BOARD_DRIVER_LED_
+#define _BOARD_DRIVER_LED_
+
+#include <sam.h>
+#include "board_definitions.h"
+
+#if defined(BOARD_LED_PORT)
+inline void LED_init(void) { PORT->Group[BOARD_LED_PORT].DIRSET.reg = (1<<BOARD_LED_PIN); }
+inline void LED_on(void) { PORT->Group[BOARD_LED_PORT].OUTSET.reg = (1<<BOARD_LED_PIN); }
+inline void LED_off(void) { PORT->Group[BOARD_LED_PORT].OUTCLR.reg = (1<<BOARD_LED_PIN); }
+inline void LED_toggle(void) { PORT->Group[BOARD_LED_PORT].OUTTGL.reg = (1<<BOARD_LED_PIN); }
+#else
+inline void LED_init(void) { }
+inline void LED_on(void) { }
+inline void LED_off(void) { }
+inline void LED_toggle(void) { }
+#endif
+void LED_pulse();
+
+#if defined(BOARD_LEDRX_PORT)
+inline void LEDRX_init(void) { PORT->Group[BOARD_LEDRX_PORT].DIRSET.reg = (1<<BOARD_LEDRX_PIN); }
+inline void LEDRX_on(void) { PORT->Group[BOARD_LEDRX_PORT].OUTCLR.reg = (1<<BOARD_LEDRX_PIN); }
+inline void LEDRX_off(void) { PORT->Group[BOARD_LEDRX_PORT].OUTSET.reg = (1<<BOARD_LEDRX_PIN); }
+inline void LEDRX_toggle(void) { PORT->Group[BOARD_LEDRX_PORT].OUTTGL.reg = (1<<BOARD_LEDRX_PIN); }
+#else
+inline void LEDRX_init(void) { }
+inline void LEDRX_on(void) { }
+inline void LEDRX_off(void) { }
+inline void LEDRX_toggle(void) { }
+#endif
+
+#if defined(BOARD_LEDTX_PORT)
+inline void LEDTX_init(void) { PORT->Group[BOARD_LEDTX_PORT].DIRSET.reg = (1<<BOARD_LEDTX_PIN); }
+inline void LEDTX_on(void) { PORT->Group[BOARD_LEDTX_PORT].OUTCLR.reg = (1<<BOARD_LEDTX_PIN); }
+inline void LEDTX_off(void) { PORT->Group[BOARD_LEDTX_PORT].OUTSET.reg = (1<<BOARD_LEDTX_PIN); }
+inline void LEDTX_toggle(void) { PORT->Group[BOARD_LEDTX_PORT].OUTTGL.reg = (1<<BOARD_LEDTX_PIN); }
+#else
+inline void LEDTX_init(void) { }
+inline void LEDTX_on(void) { }
+inline void LEDTX_off(void) { }
+inline void LEDTX_toggle(void) { }
+#endif
+
+#endif // _BOARD_DRIVER_LED_

bootloaders/metroM4/board_driver_serial.c

@@ -0,0 +1,104 @@
+ /*
+  Copyright (c) 2015 Arduino LLC.  All right reserved.
+  Copyright (c) 2015 Atmel Corporation/Thibaut VIARD.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#include "board_driver_serial.h"
+
+bool uart_drv_error_flag = false;
+
+void uart_basic_init(Sercom *sercom, uint16_t baud_val, enum uart_pad_settings pad_conf)
+{
+	/* Wait for synchronization */
+	while(sercom->USART.SYNCBUSY.bit.ENABLE);
+	/* Disable the SERCOM UART module */
+	sercom->USART.CTRLA.bit.ENABLE = 0;
+	/* Wait for synchronization */
+	while(sercom->USART.SYNCBUSY.bit.SWRST);
+	/* Perform a software reset */
+	sercom->USART.CTRLA.bit.SWRST = 1;
+	/* Wait for synchronization */
+	while(sercom->USART.CTRLA.bit.SWRST);
+	/* Wait for synchronization */
+	while(sercom->USART.SYNCBUSY.bit.SWRST || sercom->USART.SYNCBUSY.bit.ENABLE);
+	/* Update the UART pad settings, mode and data order settings */
+	sercom->USART.CTRLA.reg = pad_conf | SERCOM_USART_CTRLA_MODE(1) | SERCOM_USART_CTRLA_DORD;
+	/* Wait for synchronization */
+	while(sercom->USART.SYNCBUSY.bit.CTRLB);
+	/* Enable transmit and receive and set data size to 8 bits */
+	sercom->USART.CTRLB.reg = SERCOM_USART_CTRLB_RXEN | SERCOM_USART_CTRLB_TXEN | SERCOM_USART_CTRLB_CHSIZE(0);
+	/* Load the baud value */
+	sercom->USART.BAUD.reg = baud_val;
+	///* Wait for synchronization */
+	while(sercom->USART.SYNCBUSY.bit.ENABLE);
+	/* Enable SERCOM UART */
+	sercom->USART.CTRLA.bit.ENABLE = 1;
+}
+
+void uart_disable(Sercom *sercom)
+{
+	/* Wait for synchronization */
+	while(sercom->USART.SYNCBUSY.bit.ENABLE);
+	/* Disable SERCOM UART */
+	sercom->USART.CTRLA.bit.ENABLE = 0;
+}
+
+void uart_write_byte(Sercom *sercom, uint8_t data)
+{
+	/* Wait for Data Register Empty flag */
+	while(!sercom->USART.INTFLAG.bit.DRE);
+	/* Write the data to DATA register */
+	sercom->USART.DATA.reg = (uint16_t)data;
+}
+
+uint8_t uart_read_byte(Sercom *sercom)
+{
+	/* Wait for Receive Complete flag */
+	while(!sercom->USART.INTFLAG.bit.RXC);
+	/* Check for errors */
+	if (sercom->USART.STATUS.bit.PERR || sercom->USART.STATUS.bit.FERR || sercom->USART.STATUS.bit.BUFOVF)
+		/* Set the error flag */
+		uart_drv_error_flag = true;
+	/* Return the read data */
+	return((uint8_t)sercom->USART.DATA.reg);
+}
+
+void uart_write_buffer_polled(Sercom *sercom, uint8_t *ptr, uint16_t length)
+{
+	/* Do the following for specified length */
+	do {
+		/* Wait for Data Register Empty flag */
+		while(!sercom->USART.INTFLAG.bit.DRE);
+		/* Send data from the buffer */
+		sercom->USART.DATA.reg = (uint16_t)*ptr++;
+	} while (length--);
+}
+
+void uart_read_buffer_polled(Sercom *sercom, uint8_t *ptr, uint16_t length)
+{
+	/* Do the following for specified length */
+	do {
+		/* Wait for Receive Complete flag */
+		while(!sercom->USART.INTFLAG.bit.RXC);
+		/* Check for errors */
+		if (sercom->USART.STATUS.bit.PERR || sercom->USART.STATUS.bit.FERR || sercom->USART.STATUS.bit.BUFOVF)
+			/* Set the error flag */
+			uart_drv_error_flag = true;
+		/* Store the read data to the buffer */
+		*ptr++ = (uint8_t)sercom->USART.DATA.reg;
+	} while (length--);
+}

bootloaders/metroM4/board_driver_serial.h

@@ -0,0 +1,89 @@
+/*
+  Copyright (c) 2015 Arduino LLC.  All right reserved.
+  Copyright (c) 2015 Atmel Corporation/Thibaut VIARD.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#ifndef UART_DRIVER_H
+#define UART_DRIVER_H
+
+#include <stdio.h>
+#include <stdbool.h>
+#include <sam.h>
+
+#define PINMUX_UNUSED          0xFFFFFFFF
+
+/* SERCOM UART available pad settings */
+enum uart_pad_settings {
+	UART_RX_PAD0_TX_PAD2 = SERCOM_USART_CTRLA_RXPO(0) | SERCOM_USART_CTRLA_TXPO(1),
+	UART_RX_PAD1_TX_PAD2 = SERCOM_USART_CTRLA_RXPO(1) | SERCOM_USART_CTRLA_TXPO(1),
+	UART_RX_PAD2_TX_PAD0 = SERCOM_USART_CTRLA_RXPO(2),
+	UART_RX_PAD3_TX_PAD0 = SERCOM_USART_CTRLA_RXPO(3),
+	UART_RX_PAD1_TX_PAD0 = SERCOM_USART_CTRLA_RXPO(1),
+	UART_RX_PAD3_TX_PAD2 = SERCOM_USART_CTRLA_RXPO(3) | SERCOM_USART_CTRLA_TXPO(1),
+};
+
+/**
+ * \brief Initializes the UART
+ *
+ * \param Pointer to SERCOM instance
+ * \param Baud value corresponding to the desired baudrate
+ * \param SERCOM pad settings
+ */
+void uart_basic_init(Sercom *sercom, uint16_t baud_val, enum uart_pad_settings pad_conf);
+
+/**
+ * \brief Disables UART interface
+ *
+ * \param Pointer to SERCOM instance
+ */
+void uart_disable(Sercom *sercom);
+
+/**
+ * \brief Sends a single byte through UART interface
+ *
+ * \param Pointer to SERCOM instance
+ * \param Data to send
+ */
+void uart_write_byte(Sercom *sercom, uint8_t data);
+
+/**
+ * \brief Reads a single character from UART interface
+ *
+ * \param Pointer to SERCOM instance
+ * \return Data byte read
+ */
+uint8_t uart_read_byte(Sercom *sercom);
+
+/**
+ * \brief Sends buffer on UART interface
+ *
+ * \param Pointer to SERCOM instance
+ * \param Pointer to data to send
+ * \param Number of bytes to send
+ */
+void uart_write_buffer_polled(Sercom *sercom, uint8_t *ptr, uint16_t length);
+
+/**
+ * \brief Reads data on UART interface
+ *
+ * \param Pointer to SERCOM instance
+ * \param Pointer to store read data
+ * \param Number of bytes to read
+ */
+void uart_read_buffer_polled(Sercom *sercom, uint8_t *ptr, uint16_t length);
+
+#endif

bootloaders/metroM4/board_driver_usb.c

@@ -0,0 +1,359 @@
+/*
+  Copyright (c) 2015 Arduino LLC.  All right reserved.
+  Copyright (c) 2015 Atmel Corporation/Thibaut VIARD.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#include <string.h>
+#include "board_driver_usb.h"
+#include "sam_ba_usb.h"
+#include "sam_ba_cdc.h"
+
+#define NVM_USB_PAD_TRANSN_POS 32
+#define NVM_USB_PAD_TRANSN_SIZE 5
+#define NVM_USB_PAD_TRANSP_POS 37
+#define NVM_USB_PAD_TRANSP_SIZE 5
+#define NVM_USB_PAD_TRIM_POS 42
+#define NVM_USB_PAD_TRIM_SIZE 3
+
+__attribute__((__aligned__(4))) UsbDeviceDescriptor usb_endpoint_table[MAX_EP]; // Initialized to zero in USB_Init
+__attribute__((__aligned__(4))) uint8_t udd_ep_out_cache_buffer[2][64]; //1 for CTRL, 1 for BULK
+__attribute__((__aligned__(4))) uint8_t udd_ep_in_cache_buffer[2][64]; //1 for CTRL, 1 for BULK
+
+static volatile bool read_job = false;
+
+/*----------------------------------------------------------------------------
+ * \brief
+ */
+P_USB_CDC USB_Open(P_USB_CDC pCdc, Usb *pUsb)
+{
+  pCdc->pUsb = pUsb;
+  pCdc->currentConfiguration = 0;
+  pCdc->currentConnection    = 0;
+  pCdc->IsConfigured = USB_IsConfigured;
+//  pCdc->Write        = USB_Write;
+//  pCdc->Read         = USB_Read;
+
+  pCdc->pUsb->HOST.CTRLA.bit.ENABLE = true;
+  
+  while( pCdc->pUsb->HOST.SYNCBUSY.reg & USB_SYNCBUSY_ENABLE ); //wait for sync
+
+  return pCdc;
+}
+
+
+/**
+ * \brief Load USB calibration value from NVM
+ */
+static void USB_load_calib(void)
+{
+	Usb *    hw = USB;
+	uint32_t pad_transn
+	    = (*((uint32_t *)(NVMCTRL_SW0) + (NVM_USB_PAD_TRANSN_POS / 32)) >> (NVM_USB_PAD_TRANSN_POS % 32))
+	      & ((1 << NVM_USB_PAD_TRANSN_SIZE) - 1);
+	uint32_t pad_transp
+	    = (*((uint32_t *)(NVMCTRL_SW0) + (NVM_USB_PAD_TRANSP_POS / 32)) >> (NVM_USB_PAD_TRANSP_POS % 32))
+	      & ((1 << NVM_USB_PAD_TRANSP_SIZE) - 1);
+	uint32_t pad_trim = (*((uint32_t *)(NVMCTRL_SW0) + (NVM_USB_PAD_TRIM_POS / 32)) >> (NVM_USB_PAD_TRIM_POS % 32))
+	                    & ((1 << NVM_USB_PAD_TRIM_SIZE) - 1);
+	if (pad_transn == 0 || pad_transn == 0x1F) {
+		pad_transn = 9;
+	}
+	if (pad_transp == 0 || pad_transp == 0x1F) {
+		pad_transp = 25;
+	}
+	if (pad_trim == 0 || pad_trim == 0x7) {
+		pad_trim = 6;
+	}
+
+	hw->DEVICE.PADCAL.reg = USB_PADCAL_TRANSN(pad_transn) | USB_PADCAL_TRANSP(pad_transp) | USB_PADCAL_TRIM(pad_trim);
+
+	hw->DEVICE.QOSCTRL.bit.CQOS = 3;
+	hw->DEVICE.QOSCTRL.bit.DQOS = 3;
+}
+
+/*----------------------------------------------------------------------------
+ * \brief Initializes USB
+ */
+void USB_Init(void)
+{
+  uint32_t pad_transn, pad_transp, pad_trim;
+
+  /* Enable USB clock */
+  MCLK->APBBMASK.bit.USB_ = 1;
+
+  /* Set up the USB DP/DN pins */
+  PORT->Group[0].PINCFG[PIN_PA24H_USB_DM].bit.PMUXEN = 1;
+  PORT->Group[0].PMUX[PIN_PA24H_USB_DM/2].reg &= ~(0xF << (4 * (PIN_PA24H_USB_DM & 0x01u)));
+  PORT->Group[0].PMUX[PIN_PA24H_USB_DM/2].reg |= MUX_PA24H_USB_DM << (4 * (PIN_PA24H_USB_DM & 0x01u));
+  PORT->Group[0].PINCFG[PIN_PA25H_USB_DP].bit.PMUXEN = 1;
+  PORT->Group[0].PMUX[PIN_PA25H_USB_DP/2].reg &= ~(0xF << (4 * (PIN_PA25H_USB_DP & 0x01u)));
+  PORT->Group[0].PMUX[PIN_PA25H_USB_DP/2].reg |= MUX_PA25H_USB_DP << (4 * (PIN_PA25H_USB_DP & 0x01u));
+
+  /* ----------------------------------------------------------------------------------------------
+   * Put Generic Clock Generator 0 as source for Generic Clock Multiplexer 6 (USB reference)
+   *
+	*/
+  GCLK->PCHCTRL[USB_GCLK_ID].reg = GCLK_PCHCTRL_GEN_GCLK0_Val | (1 << GCLK_PCHCTRL_CHEN_Pos);
+  MCLK->APBBMASK.reg |= MCLK_APBBMASK_USB;
+  while(GCLK->SYNCBUSY.bit.GENCTRL0)
+  {
+    /* Wait for synchronization */
+  }
+
+  /* Reset */
+  USB->DEVICE.CTRLA.bit.SWRST = 1;
+  while (USB->DEVICE.SYNCBUSY.bit.SWRST)
+  {
+    /* Sync wait */
+  }
+
+  USB_load_calib();
+
+  /* Set the configuration */
+  /* Set mode to Device mode */
+  USB->HOST.CTRLA.bit.MODE = 0;
+  /* Enable Run in Standby */
+  USB->HOST.CTRLA.bit.RUNSTDBY = true;
+  /* Set the descriptor address */
+  USB->HOST.DESCADD.reg = (uint32_t)(&usb_endpoint_table[0]);
+  /* Set speed configuration to Full speed */
+  USB->DEVICE.CTRLB.bit.SPDCONF = USB_DEVICE_CTRLB_SPDCONF_FS_Val;
+  /* Attach to the USB host */
+  USB->DEVICE.CTRLB.reg &= ~USB_DEVICE_CTRLB_DETACH;
+
+  /* Initialize endpoint table RAM location to a known value 0 */
+  memset((uint8_t *)(&usb_endpoint_table[0]), 0, sizeof(usb_endpoint_table));
+}
+
+uint32_t USB_Write(Usb *pUsb, const char *pData, uint32_t length, uint8_t ep_num)
+{
+  uint32_t data_address;
+  uint8_t buf_index;
+
+  /* Set buffer index */
+  buf_index = (ep_num == 0) ? 0 : 1;
+
+  /* Check for requirement for multi-packet or auto zlp */
+  if (length >= (1 << (usb_endpoint_table[ep_num].DeviceDescBank[1].PCKSIZE.bit.SIZE + 3)))
+  {
+    /* Update the EP data address */
+    data_address = (uint32_t) pData;
+    /* Enable auto zlp */
+    usb_endpoint_table[ep_num].DeviceDescBank[1].PCKSIZE.bit.AUTO_ZLP = true;
+  }
+  else
+  {
+    /* Copy to local buffer */
+    memcpy(udd_ep_in_cache_buffer[buf_index], pData, length);
+    /* Update the EP data address */
+    data_address = (uint32_t) &udd_ep_in_cache_buffer[buf_index];
+  }
+
+  /* Set the buffer address for ep data */
+  usb_endpoint_table[ep_num].DeviceDescBank[1].ADDR.reg = data_address;
+  /* Set the byte count as zero */
+  usb_endpoint_table[ep_num].DeviceDescBank[1].PCKSIZE.bit.BYTE_COUNT = length;
+  /* Set the multi packet size as zero for multi-packet transfers where length > ep size */
+  usb_endpoint_table[ep_num].DeviceDescBank[1].PCKSIZE.bit.MULTI_PACKET_SIZE = 0;
+  /* Clear the transfer complete flag  */
+  pUsb->DEVICE.DeviceEndpoint[ep_num].EPINTFLAG.reg = USB_DEVICE_EPINTFLAG_TRCPT1;
+  /* Set the bank as ready */
+  pUsb->DEVICE.DeviceEndpoint[ep_num].EPSTATUSSET.bit.BK1RDY = true;
+
+  /* Wait for transfer to complete */
+  while ( (pUsb->DEVICE.DeviceEndpoint[ep_num].EPINTFLAG.bit.TRCPT1) == 0 );
+
+  return length;
+}
+
+/*----------------------------------------------------------------------------
+ * \brief Read available data from Endpoint OUT
+ */
+uint32_t USB_Read(Usb *pUsb, char *pData, uint32_t length)
+{
+  uint32_t packetSize = 0;
+
+  if (!read_job)
+  {
+    /* Set the buffer address for ep data */
+    usb_endpoint_table[USB_EP_OUT].DeviceDescBank[0].ADDR.reg = (uint32_t)&udd_ep_out_cache_buffer[USB_EP_OUT-1];
+    /* Set the byte count as zero */
+    usb_endpoint_table[USB_EP_OUT].DeviceDescBank[0].PCKSIZE.bit.BYTE_COUNT = 0;
+    /* Set the byte count as zero */
+    usb_endpoint_table[USB_EP_OUT].DeviceDescBank[0].PCKSIZE.bit.MULTI_PACKET_SIZE = 0;
+    /* Start the reception by clearing the bank 0 ready bit */
+    pUsb->DEVICE.DeviceEndpoint[USB_EP_OUT].EPSTATUSCLR.bit.BK0RDY = true;
+    /* set the user flag */
+    read_job = true;
+  }
+
+  /* Check for Transfer Complete 0 flag */
+  if ( pUsb->DEVICE.DeviceEndpoint[USB_EP_OUT].EPINTFLAG.bit.TRCPT0 )
+  {
+    /* Set packet size */
+    packetSize = SAM_BA_MIN(usb_endpoint_table[USB_EP_OUT].DeviceDescBank[0].PCKSIZE.bit.BYTE_COUNT, length);
+    /* Copy read data to user buffer */
+    memcpy(pData, udd_ep_out_cache_buffer[USB_EP_OUT-1], packetSize);
+    /* Clear the Transfer Complete 0 flag */
+    pUsb->DEVICE.DeviceEndpoint[USB_EP_OUT].EPINTFLAG.reg = USB_DEVICE_EPINTFLAG_TRCPT0;
+    /* Clear the user flag */
+    read_job = false;
+  }
+
+  return packetSize;
+}
+
+uint32_t USB_Read_blocking(Usb *pUsb, char *pData, uint32_t length)
+{
+  if (read_job)
+  {
+    /* Stop the reception by setting the bank 0 ready bit */
+    pUsb->DEVICE.DeviceEndpoint[USB_EP_OUT].EPSTATUSSET.bit.BK0RDY = true;
+    /* Clear the user flag */
+    read_job = false;
+  }
+
+  /* Set the buffer address for ep data */
+  usb_endpoint_table[USB_EP_OUT].DeviceDescBank[0].ADDR.reg = ((uint32_t)pData);
+  /* Set the byte count as zero */
+  usb_endpoint_table[USB_EP_OUT].DeviceDescBank[0].PCKSIZE.bit.BYTE_COUNT = 0;
+  /* Set the multi packet size as zero for multi-packet transfers where length > ep size */
+  usb_endpoint_table[USB_EP_OUT].DeviceDescBank[0].PCKSIZE.bit.MULTI_PACKET_SIZE = length;
+  /* Clear the bank 0 ready flag */
+  pUsb->DEVICE.DeviceEndpoint[USB_EP_OUT].EPSTATUSCLR.bit.BK0RDY = true;
+  /* Wait for transfer to complete */
+  while (!( pUsb->DEVICE.DeviceEndpoint[USB_EP_OUT].EPINTFLAG.bit.TRCPT0 ));
+  /* Clear Transfer complete 0 flag */
+  pUsb->DEVICE.DeviceEndpoint[USB_EP_OUT].EPINTFLAG.reg = USB_DEVICE_EPINTFLAG_TRCPT0;
+
+  return length;
+}
+
+/*----------------------------------------------------------------------------
+ * \brief Test if the device is configured and handle enumeration
+ */
+uint8_t USB_IsConfigured(P_USB_CDC pCdc)
+{
+  Usb *pUsb = pCdc->pUsb;
+
+  /* Check for End of Reset flag */
+  if (pUsb->DEVICE.INTFLAG.reg & USB_DEVICE_INTFLAG_EORST)
+  {
+    /* Clear the flag */
+    pUsb->DEVICE.INTFLAG.reg = USB_DEVICE_INTFLAG_EORST;
+    /* Set Device address as 0 */
+    pUsb->DEVICE.DADD.reg = USB_DEVICE_DADD_ADDEN | 0;
+    /* Configure endpoint 0 */
+    /* Configure Endpoint 0 for Control IN and Control OUT */
+    pUsb->DEVICE.DeviceEndpoint[0].EPCFG.reg = USB_DEVICE_EPCFG_EPTYPE0(1) | USB_DEVICE_EPCFG_EPTYPE1(1);
+    pUsb->DEVICE.DeviceEndpoint[0].EPSTATUSSET.reg = USB_DEVICE_EPSTATUSSET_BK0RDY;
+    pUsb->DEVICE.DeviceEndpoint[0].EPSTATUSCLR.reg = USB_DEVICE_EPSTATUSCLR_BK1RDY;
+    /* Configure control OUT Packet size to 64 bytes */
+    usb_endpoint_table[0].DeviceDescBank[0].PCKSIZE.bit.SIZE = 3;
+    /* Configure control IN Packet size to 64 bytes */
+    usb_endpoint_table[0].DeviceDescBank[1].PCKSIZE.bit.SIZE = 3;
+    /* Configure the data buffer address for control OUT */
+    usb_endpoint_table[0].DeviceDescBank[0].ADDR.reg = (uint32_t)&udd_ep_out_cache_buffer[0];
+    /* Configure the data buffer address for control IN */
+    usb_endpoint_table[0].DeviceDescBank[1].ADDR.reg = (uint32_t)&udd_ep_in_cache_buffer[0];
+    /* Set Multipacket size to 8 for control OUT and byte count to 0*/
+    usb_endpoint_table[0].DeviceDescBank[0].PCKSIZE.bit.MULTI_PACKET_SIZE = 8;
+    usb_endpoint_table[0].DeviceDescBank[0].PCKSIZE.bit.BYTE_COUNT = 0;
+    pUsb->DEVICE.DeviceEndpoint[0].EPSTATUSCLR.reg = USB_DEVICE_EPSTATUSCLR_BK0RDY;
+
+    // Reset current configuration value to 0
+    pCdc->currentConfiguration = 0;
+  }
+  else
+  {
+    if (pUsb->DEVICE.DeviceEndpoint[0].EPINTFLAG.reg & USB_DEVICE_EPINTFLAG_RXSTP)
+    {
+      sam_ba_usb_CDC_Enumerate(pCdc);
+    }
+  }
+
+  return pCdc->currentConfiguration;
+}
+
+/*----------------------------------------------------------------------------
+ * \brief Stall the control endpoint
+ */
+void USB_SendStall(Usb *pUsb, bool direction_in)
+{
+  /* Check the direction */
+  if (direction_in)
+  {
+    /* Set STALL request on IN direction */
+    pUsb->DEVICE.DeviceEndpoint[0].EPSTATUSSET.bit.STALLRQ1 = 1;
+  }
+  else
+  {
+    /* Set STALL request on OUT direction */
+    pUsb->DEVICE.DeviceEndpoint[0].EPSTATUSSET.bit.STALLRQ0 = 1;
+  }
+}
+
+/*----------------------------------------------------------------------------
+ * \brief Send zero length packet through the control endpoint
+ */
+void USB_SendZlp(Usb *pUsb)
+{
+  /* Set the byte count as zero */
+  usb_endpoint_table[0].DeviceDescBank[1].PCKSIZE.bit.BYTE_COUNT = 0;
+  /* Clear the transfer complete flag  */
+  pUsb->DEVICE.DeviceEndpoint[0].EPINTFLAG.reg = USB_DEVICE_EPINTFLAG_TRCPT1;
+  /* Set the bank as ready */
+  pUsb->DEVICE.DeviceEndpoint[0].EPSTATUSSET.bit.BK1RDY = true;
+  /* Wait for transfer to complete */
+  while (!( pUsb->DEVICE.DeviceEndpoint[0].EPINTFLAG.bit.TRCPT1 ));
+}
+
+/*----------------------------------------------------------------------------
+ * \brief Set USB device address obtained from host
+ */
+void USB_SetAddress(Usb *pUsb, uint16_t wValue)
+{
+  pUsb->DEVICE.DADD.reg = USB_DEVICE_DADD_ADDEN | wValue;
+}
+
+/*----------------------------------------------------------------------------
+ * \brief Configure USB device
+ */
+void USB_Configure(Usb *pUsb)
+{
+  /* Configure BULK OUT endpoint for CDC Data interface*/
+  pUsb->DEVICE.DeviceEndpoint[USB_EP_OUT].EPCFG.reg = USB_DEVICE_EPCFG_EPTYPE0(3);
+  /* Set maximum packet size as 64 bytes */
+  usb_endpoint_table[USB_EP_OUT].DeviceDescBank[0].PCKSIZE.bit.SIZE = 3;
+  pUsb->DEVICE.DeviceEndpoint[USB_EP_OUT].EPSTATUSSET.reg = USB_DEVICE_EPSTATUSSET_BK0RDY;
+  /* Configure the data buffer */
+  usb_endpoint_table[USB_EP_OUT].DeviceDescBank[0].ADDR.reg = (uint32_t)&udd_ep_out_cache_buffer[1];
+
+  /* Configure BULK IN endpoint for CDC Data interface */
+  pUsb->DEVICE.DeviceEndpoint[USB_EP_IN].EPCFG.reg = USB_DEVICE_EPCFG_EPTYPE1(3);
+  /* Set maximum packet size as 64 bytes */
+  usb_endpoint_table[USB_EP_IN].DeviceDescBank[1].PCKSIZE.bit.SIZE = 3;
+  pUsb->DEVICE.DeviceEndpoint[USB_EP_IN].EPSTATUSCLR.reg = USB_DEVICE_EPSTATUSCLR_BK1RDY;
+  /* Configure the data buffer */
+  usb_endpoint_table[USB_EP_IN].DeviceDescBank[1].ADDR.reg = (uint32_t)&udd_ep_in_cache_buffer[1];
+
+  /* Configure INTERRUPT IN endpoint for CDC COMM interface*/
+  pUsb->DEVICE.DeviceEndpoint[USB_EP_COMM].EPCFG.reg = USB_DEVICE_EPCFG_EPTYPE1(4);
+  /* Set maximum packet size as 64 bytes */
+  usb_endpoint_table[USB_EP_COMM].DeviceDescBank[1].PCKSIZE.bit.SIZE = 0;
+  pUsb->DEVICE.DeviceEndpoint[USB_EP_COMM].EPSTATUSCLR.reg = USB_DEVICE_EPSTATUSCLR_BK1RDY;
+}

bootloaders/metroM4/board_driver_usb.h

@@ -0,0 +1,45 @@
+/*
+  Copyright (c) 2015 Arduino LLC.  All right reserved.
+  Copyright (c) 2015 Atmel Corporation/Thibaut VIARD.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#ifndef _BOARD_DRIVER_USB_H_
+#define _BOARD_DRIVER_USB_H_
+
+#include "sam_ba_cdc.h"
+
+extern UsbDeviceDescriptor usb_endpoint_table[MAX_EP];
+extern uint8_t udd_ep_out_cache_buffer[2][64]; //1 for CTRL, 1 for BULK
+extern uint8_t udd_ep_in_cache_buffer[2][64]; //1 for CTRL, 1 for BULK
+
+P_USB_CDC USB_Open(P_USB_CDC pCdc, Usb *pUsb);
+
+void USB_Init(void);
+
+uint32_t USB_Write(Usb *pUsb, const char *pData, uint32_t length, uint8_t ep_num);
+uint32_t USB_Read(Usb *pUsb, char *pData, uint32_t length);
+uint32_t USB_Read_blocking(Usb *pUsb, char *pData, uint32_t length);
+
+uint8_t USB_IsConfigured(P_USB_CDC pCdc);
+
+void USB_SendStall(Usb *pUsb, bool direction_in);
+void USB_SendZlp(Usb *pUsb);
+
+void USB_SetAddress(Usb *pUsb, uint16_t wValue);
+void USB_Configure(Usb *pUsb);
+
+#endif // _BOARD_DRIVER_USB_H_

bootloaders/metroM4/board_init.c

@@ -0,0 +1,145 @@
+/*
+  Copyright (c) 2015 Arduino LLC.  All right reserved.
+  Copyright (c) 2015 Atmel Corporation/Thibaut VIARD.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#include <sam.h>
+#include "board_definitions.h"
+
+/**
+ * \brief system_init() configures the needed clocks and according Flash Read Wait States.
+ * We need to:
+ * 1) Enable XOSC32K clock (External on-board 32.768Hz oscillator), will be used as DFLL48M reference.
+ * 2) Put XOSC32K as source of Generic Clock Generator 3
+ * 3) Put Generic Clock Generator 3 as source for Generic Clock Multiplexer 0 (DFLL48M reference)
+ * 4) Enable DFLL48M clock
+ * 5) Switch Generic Clock Generator 0 to DFLL48M. CPU will run at 48MHz.
+ */
+// Constants for Clock generators
+#define GENERIC_CLOCK_GENERATOR_MAIN      (0u)
+#define GENERIC_CLOCK_GENERATOR_XOSC32K   (3u)
+#define GENERIC_CLOCK_GENERATOR_OSCULP32K (2u) /* Initialized at reset for WDT */
+//#define GENERIC_CLOCK_GENERATOR_OSC8M     (3u)
+// Constants for Clock multiplexers
+#define GENERIC_CLOCK_MULTIPLEXER_DFLL48M (0u)
+
+void board_init(void)
+{
+	
+  /* Set 1 Flash Wait State for 48MHz */
+  NVMCTRL->CTRLA.reg |= NVMCTRL_CTRLA_RWS(0);
+
+  /* ----------------------------------------------------------------------------------------------
+   * 1) Enable XOSC32K clock (External on-board 32.768Hz oscillator)
+   */
+	OSC32KCTRL->XOSC32K.reg = OSC32KCTRL_XOSC32K_ENABLE | OSC32KCTRL_XOSC32K_EN32K | OSC32KCTRL_XOSC32K_EN32K | OSC32KCTRL_XOSC32K_CGM_XT | OSC32KCTRL_XOSC32K_XTALEN;
+	
+	while( (OSC32KCTRL->STATUS.reg & OSC32KCTRL_STATUS_XOSC32KRDY) == 0 ){
+		/* Wait for oscillator to be ready */
+	}
+	
+	OSC32KCTRL->RTCCTRL.bit.RTCSEL = OSC32KCTRL_RTCCTRL_RTCSEL_ULP1K;
+
+
+  /* Software reset the module to ensure it is re-initialized correctly */
+  /* Note: Due to synchronization, there is a delay from writing CTRL.SWRST until the reset is complete.
+   * CTRL.SWRST and STATUS.SYNCBUSY will both be cleared when the reset is complete
+   */
+  GCLK->CTRLA.bit.SWRST = 1;
+  while ( GCLK->SYNCBUSY.reg & GCLK_SYNCBUSY_SWRST ){
+	  /* wait for reset to complete */
+  }
+  
+	/* ----------------------------------------------------------------------------------------------
+	* 2) Put XOSC32K as source of Generic Clock Generator 3
+	*/
+	GCLK->GENCTRL[GENERIC_CLOCK_GENERATOR_XOSC32K].reg = GCLK_GENCTRL_SRC(GCLK_GENCTRL_SRC_XOSC32K) | //generic clock gen 3
+									GCLK_GENCTRL_GENEN;
+
+	while ( GCLK->SYNCBUSY.reg & GCLK_SYNCBUSY_GENCTRL3 ){
+		/* Wait for synchronization */
+	}
+  
+	/* ----------------------------------------------------------------------------------------------
+	* 3) Put Generic Clock Generator 3 as source for Generic Clock Gen 0 (DFLL48M reference)
+	*/
+	GCLK->GENCTRL[0].reg = GCLK_GENCTRL_SRC(GCLK_GENCTRL_SRC_OSCULP32K) | GCLK_GENCTRL_GENEN;
+	
+	/* ----------------------------------------------------------------------------------------------
+	* 4) Enable DFLL48M clock
+	*/
+
+	/* DFLL Configuration in Open Loop mode */
+
+	OSCCTRL->DFLLCTRLA.reg = 0;
+	//GCLK->PCHCTRL[OSCCTRL_GCLK_ID_DFLL48].reg = (1 << GCLK_PCHCTRL_CHEN_Pos) | GCLK_PCHCTRL_GEN(GCLK_PCHCTRL_GEN_GCLK3_Val);
+
+	OSCCTRL->DFLLMUL.reg = OSCCTRL_DFLLMUL_CSTEP( 0x1 ) |
+						OSCCTRL_DFLLMUL_FSTEP( 0x1 ) |
+						OSCCTRL_DFLLMUL_MUL( 0 );
+
+	while ( OSCCTRL->DFLLSYNC.reg & OSCCTRL_DFLLSYNC_DFLLMUL )
+	{
+	/* Wait for synchronization */
+	}
+  
+	OSCCTRL->DFLLCTRLB.reg = 0;
+	while ( OSCCTRL->DFLLSYNC.reg & OSCCTRL_DFLLSYNC_DFLLCTRLB )
+	{
+		/* Wait for synchronization */
+	}
+  
+	OSCCTRL->DFLLCTRLA.reg |= OSCCTRL_DFLLCTRLA_ENABLE;
+	while ( OSCCTRL->DFLLSYNC.reg & OSCCTRL_DFLLSYNC_ENABLE )
+	{
+		/* Wait for synchronization */
+	}
+	
+	OSCCTRL->DFLLVAL.reg = OSCCTRL->DFLLVAL.reg;
+	while( OSCCTRL->DFLLSYNC.bit.DFLLVAL );
+  
+  OSCCTRL->DFLLCTRLB.reg = OSCCTRL_DFLLCTRLB_WAITLOCK |
+  OSCCTRL_DFLLCTRLB_CCDIS | OSCCTRL_DFLLCTRLB_USBCRM ;
+  
+	while ( !OSCCTRL->STATUS.bit.DFLLRDY )
+	{
+		/* Wait for synchronization */
+	}
+
+  /* ----------------------------------------------------------------------------------------------
+   * 5) Switch Generic Clock Generator 0 to DFLL48M. CPU will run at 48MHz.
+   */
+	GCLK->GENCTRL[GENERIC_CLOCK_GENERATOR_MAIN].reg = GCLK_GENCTRL_SRC(GCLK_GENCTRL_SRC_DFLL) |
+					GCLK_GENCTRL_IDC |
+					GCLK_GENCTRL_OE |
+					GCLK_GENCTRL_GENEN;
+
+  while ( GCLK->SYNCBUSY.reg & GCLK_SYNCBUSY_GENCTRL0 )
+  {
+    /* Wait for synchronization */
+  }
+  
+  
+  /* Turn on the digital interface clock */
+  //MCLK->APBAMASK.reg |= MCLK_APBAMASK_GCLK;
+
+  /*
+   * Now that all system clocks are configured, we can set CLKDIV .
+   * These values are normally the ones present after Reset.
+   */
+	MCLK->CPUDIV.reg = MCLK_CPUDIV_DIV_DIV1;
+}

bootloaders/metroM4/board_startup.c

@@ -0,0 +1,160 @@
+/*
+  Copyright (c) 2015 Arduino LLC.  All right reserved.
+  Copyright (c) 2015 Atmel Corporation/Thibaut VIARD.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#include <sam.h>
+
+struct ConstVectors
+{
+  /* Stack pointer */
+  void* pvStack;
+
+  /* Cortex-M handlers */
+  void* pfnReset_Handler;
+  void* pfnNMI_Handler;
+  void* pfnHardFault_Handler;
+  void* pfnMemManage_Handler;
+  void* pfnBusFault_Handler;
+  void* pfnUsageFault_Handler;
+  void* pvReservedM9;
+  void* pvReservedM8;
+  void* pvReservedM7;
+  void* pvReservedM6;
+  void* pfnSVC_Handler;
+  void* pfnDebugMon_Handler;
+  void* pvReservedM3;
+  void* pfnPendSV_Handler;
+  void* pfnSysTick_Handler;
+};
+
+/* Symbols exported from linker script */
+extern uint32_t __etext ;
+extern uint32_t __data_start__ ;
+extern uint32_t __data_end__ ;
+extern uint32_t __bss_start__ ;
+extern uint32_t __bss_end__ ;
+extern uint32_t __StackTop;
+
+extern int main(void);
+extern void __libc_init_array(void);
+
+/* Exception Table */
+__attribute__ ((section(".isr_vector")))
+const struct ConstVectors exception_table =
+{
+  /* Configure Initial Stack Pointer, using linker-generated symbols */
+  .pvStack = (void*) (&__StackTop),
+
+  .pfnReset_Handler      = (void*) Reset_Handler,
+  .pfnNMI_Handler        = (void*) NMI_Handler,
+  .pfnHardFault_Handler  = (void*) HardFault_Handler,
+  .pfnMemManage_Handler        = (void*) MemManage_Handler,
+  .pfnBusFault_Handler        = (void*) BusFault_Handler,
+  .pfnUsageFault_Handler        = (void*) UsageFault_Handler,
+  .pvReservedM9         = (void*) (0UL), /* Reserved */
+  .pvReservedM8         = (void*) (0UL), /* Reserved */
+  .pvReservedM7         = (void*) (0UL), /* Reserved */
+  .pvReservedM6         = (void*) (0UL), /* Reserved */
+  .pfnSVC_Handler        = (void*) SVC_Handler,
+  .pfnDebugMon_Handler         = (void*) (0UL),
+  .pvReservedM3         = (void*) (0UL), /* Reserved */
+  .pfnPendSV_Handler     = (void*) PendSV_Handler,
+  .pfnSysTick_Handler    = (void*) SysTick_Handler,
+  
+};
+
+/**
+ * \brief This is the code that gets called on processor reset.
+ * Initializes the device and call the main() routine.
+ */
+void Reset_Handler( void )
+{
+  uint32_t *pSrc, *pDest;
+
+  /* Initialize the initialized data section */
+  pSrc = &__etext;
+  pDest = &__data_start__;
+
+  if ( (&__data_start__ != &__data_end__) && (pSrc != pDest) )
+  {
+    for (; pDest < &__data_end__ ; pDest++, pSrc++ )
+    {
+      *pDest = *pSrc ;
+    }
+  }
+
+  /* Clear the zero section */
+  if ( &__bss_start__ != &__bss_end__ )
+  {
+    for ( pDest = &__bss_start__ ; pDest < &__bss_end__ ; pDest++ )
+    {
+      *pDest = 0ul ;
+    }
+  }
+
+//  board_init(); // will be done in main() after app check
+
+  /* Initialize the C library */
+//  __libc_init_array();
+
+  main();
+
+  while (1);
+}
+
+void NMI_Handler(void)
+{
+  __BKPT(14);
+  while (1);
+}
+
+void HardFault_Handler(void)
+{
+  __BKPT(13);
+  while (1);
+}
+
+void MemManage_Handler(void)
+{
+  __BKPT(13);
+  while (1);
+}
+
+void BusFault_Handler(void)
+{
+  __BKPT(13);
+  while (1);
+}
+
+void UsageFault_Handler(void)
+{
+  __BKPT(13);
+  while (1);
+}
+
+void SVC_Handler(void)
+{
+  __BKPT(5);
+  while (1);
+}
+
+void PendSV_Handler(void)
+{
+  __BKPT(2);
+  while (1);
+}

bootloaders/metroM4/bootloader_FEATHER_M4.ld

@@ -0,0 +1,222 @@
+/*
+  Copyright (c) 2014-2015 Arduino LLC.  All right reserved.
+  Copyright (c) 2015 Atmel Corporation/Thibaut VIARD.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+/* Linker script to configure memory regions.
+ * Need modifying for a specific board.
+ *   FLASH.ORIGIN: starting address of flash
+ *   FLASH.LENGTH: length of flash
+ *   RAM.ORIGIN: starting address of RAM bank 0
+ *   RAM.LENGTH: length of RAM bank 0
+ */
+
+MEMORY
+{
+  FLASH (rx) : ORIGIN = 0x00000000, LENGTH = 0x4000 /* First 16KB used by bootloader */
+  RAM (rwx) : ORIGIN = 0x20000000, LENGTH = 0x00030000-0x0004 /* 4 bytes used by bootloader to keep data between resets */
+}
+
+/* Linker script to place sections and symbol values. Should be used together
+ * with other linker script that defines memory regions FLASH and RAM.
+ * It references following symbols, which must be defined in code:
+ *   Reset_Handler : Entry of reset handler
+ *
+ * It defines following symbols, which code can use without definition:
+ *   __exidx_start
+ *   __exidx_end
+ *   __copy_table_start__
+ *   __copy_table_end__
+ *   __zero_table_start__
+ *   __zero_table_end__
+ *   __etext
+ *   __data_start__
+ *   __preinit_array_start
+ *   __preinit_array_end
+ *   __init_array_start
+ *   __init_array_end
+ *   __fini_array_start
+ *   __fini_array_end
+ *   __data_end__
+ *   __bss_start__
+ *   __bss_end__
+ *   __end__
+ *   end
+ *   __HeapLimit
+ *   __StackLimit
+ *   __StackTop
+ *   __stack
+ *   __sketch_vectors_ptr
+ */
+ENTRY(Reset_Handler)
+
+SECTIONS
+{
+  . = ORIGIN(FLASH);
+
+  .vectors :
+  {
+    KEEP(*(.isr_vector))
+  } > FLASH
+
+	.text :
+	{
+		*(.text*)
+
+		KEEP(*(.init))
+		KEEP(*(.fini))
+
+		/* .ctors */
+		*crtbegin.o(.ctors)
+		*crtbegin?.o(.ctors)
+		*(EXCLUDE_FILE(*crtend?.o *crtend.o) .ctors)
+		*(SORT(.ctors.*))
+		*(.ctors)
+
+		/* .dtors */
+ 		*crtbegin.o(.dtors)
+ 		*crtbegin?.o(.dtors)
+ 		*(EXCLUDE_FILE(*crtend?.o *crtend.o) .dtors)
+ 		*(SORT(.dtors.*))
+ 		*(.dtors)
+
+		*(.rodata*)
+
+		KEEP(*(.eh_frame*))
+	} > FLASH
+
+	.ARM.extab :
+	{
+		*(.ARM.extab* .gnu.linkonce.armextab.*)
+	} > FLASH
+
+	__exidx_start = .;
+	.ARM.exidx :
+	{
+		*(.ARM.exidx* .gnu.linkonce.armexidx.*)
+	} > FLASH
+	__exidx_end = .;
+
+	/* To copy multiple ROM to RAM sections,
+	 * uncomment .copy.table section and,
+	 * define __STARTUP_COPY_MULTIPLE in startup_ARMCMx.S */
+	/*
+	.copy.table :
+	{
+		. = ALIGN(4);
+		__copy_table_start__ = .;
+		LONG (__etext)
+		LONG (__data_start__)
+		LONG (__data_end__ - __data_start__)
+		LONG (__etext2)
+		LONG (__data2_start__)
+		LONG (__data2_end__ - __data2_start__)
+		__copy_table_end__ = .;
+	} > FLASH
+	*/
+
+	/* To clear multiple BSS sections,
+	 * uncomment .zero.table section and,
+	 * define __STARTUP_CLEAR_BSS_MULTIPLE in startup_ARMCMx.S */
+	/*
+	.zero.table :
+	{
+		. = ALIGN(4);
+		__zero_table_start__ = .;
+		LONG (__bss_start__)
+		LONG (__bss_end__ - __bss_start__)
+		LONG (__bss2_start__)
+		LONG (__bss2_end__ - __bss2_start__)
+		__zero_table_end__ = .;
+	} > FLASH
+	*/
+
+	__etext = .;
+  PROVIDE(__sketch_vectors_ptr = ORIGIN(FLASH) + LENGTH(FLASH));
+
+
+	.data : AT (__etext)
+	{
+		__data_start__ = .;
+		*(vtable)
+		*(.data*)
+
+		. = ALIGN(4);
+		/* preinit data */
+		PROVIDE_HIDDEN (__preinit_array_start = .);
+		KEEP(*(.preinit_array))
+		PROVIDE_HIDDEN (__preinit_array_end = .);
+
+		. = ALIGN(4);
+		/* init data */
+		PROVIDE_HIDDEN (__init_array_start = .);
+		KEEP(*(SORT(.init_array.*)))
+		KEEP(*(.init_array))
+		PROVIDE_HIDDEN (__init_array_end = .);
+
+
+		. = ALIGN(4);
+		/* finit data */
+		PROVIDE_HIDDEN (__fini_array_start = .);
+		KEEP(*(SORT(.fini_array.*)))
+		KEEP(*(.fini_array))
+		PROVIDE_HIDDEN (__fini_array_end = .);
+
+		KEEP(*(.jcr*))
+		. = ALIGN(4);
+		/* All data end */
+		__data_end__ = .;
+
+	} > RAM
+
+	.bss :
+	{
+		. = ALIGN(4);
+		__bss_start__ = .;
+		*(.bss*)
+		*(COMMON)
+		. = ALIGN(4);
+		__bss_end__ = .;
+	} > RAM
+
+	.heap (COPY):
+	{
+		__end__ = .;
+		PROVIDE(end = .);
+		*(.heap*)
+		__HeapLimit = .;
+	} > RAM
+
+	/* .stack_dummy section doesn't contains any symbols. It is only
+	 * used for linker to calculate size of stack sections, and assign
+	 * values to stack symbols later */
+	.stack_dummy (COPY):
+	{
+		*(.stack*)
+	} > RAM
+
+	/* Set stack top to end of RAM, and stack limit move down by
+	 * size of stack_dummy section */
+	__StackTop = ORIGIN(RAM) + LENGTH(RAM);
+	__StackLimit = __StackTop - SIZEOF(.stack_dummy);
+	PROVIDE(__stack = __StackTop);
+
+	__ram_end__ = ORIGIN(RAM) + LENGTH(RAM) -1 ;
+
+	/* Check if data + heap + stack exceeds RAM limit */
+	ASSERT(__StackLimit >= __HeapLimit, "region RAM overflowed with stack")
+}

bootloaders/metroM4/bootloader_METRO_M4.ld

@@ -0,0 +1,222 @@
+/*
+  Copyright (c) 2014-2015 Arduino LLC.  All right reserved.
+  Copyright (c) 2015 Atmel Corporation/Thibaut VIARD.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+/* Linker script to configure memory regions.
+ * Need modifying for a specific board.
+ *   FLASH.ORIGIN: starting address of flash
+ *   FLASH.LENGTH: length of flash
+ *   RAM.ORIGIN: starting address of RAM bank 0
+ *   RAM.LENGTH: length of RAM bank 0
+ */
+
+MEMORY
+{
+  FLASH (rx) : ORIGIN = 0x00000000, LENGTH = 0x4000 /* First 16KB used by bootloader */
+  RAM (rwx) : ORIGIN = 0x20000000, LENGTH = 0x00030000-0x0004 /* 4 bytes used by bootloader to keep data between resets */
+}
+
+/* Linker script to place sections and symbol values. Should be used together
+ * with other linker script that defines memory regions FLASH and RAM.
+ * It references following symbols, which must be defined in code:
+ *   Reset_Handler : Entry of reset handler
+ *
+ * It defines following symbols, which code can use without definition:
+ *   __exidx_start
+ *   __exidx_end
+ *   __copy_table_start__
+ *   __copy_table_end__
+ *   __zero_table_start__
+ *   __zero_table_end__
+ *   __etext
+ *   __data_start__
+ *   __preinit_array_start
+ *   __preinit_array_end
+ *   __init_array_start
+ *   __init_array_end
+ *   __fini_array_start
+ *   __fini_array_end
+ *   __data_end__
+ *   __bss_start__
+ *   __bss_end__
+ *   __end__
+ *   end
+ *   __HeapLimit
+ *   __StackLimit
+ *   __StackTop
+ *   __stack
+ *   __sketch_vectors_ptr
+ */
+ENTRY(Reset_Handler)
+
+SECTIONS
+{
+  . = ORIGIN(FLASH);
+
+  .vectors :
+  {
+    KEEP(*(.isr_vector))
+  } > FLASH
+
+	.text :
+	{
+		*(.text*)
+
+		KEEP(*(.init))
+		KEEP(*(.fini))
+
+		/* .ctors */
+		*crtbegin.o(.ctors)
+		*crtbegin?.o(.ctors)
+		*(EXCLUDE_FILE(*crtend?.o *crtend.o) .ctors)
+		*(SORT(.ctors.*))
+		*(.ctors)
+
+		/* .dtors */
+ 		*crtbegin.o(.dtors)
+ 		*crtbegin?.o(.dtors)
+ 		*(EXCLUDE_FILE(*crtend?.o *crtend.o) .dtors)
+ 		*(SORT(.dtors.*))
+ 		*(.dtors)
+
+		*(.rodata*)
+
+		KEEP(*(.eh_frame*))
+	} > FLASH
+
+	.ARM.extab :
+	{
+		*(.ARM.extab* .gnu.linkonce.armextab.*)
+	} > FLASH
+
+	__exidx_start = .;
+	.ARM.exidx :
+	{
+		*(.ARM.exidx* .gnu.linkonce.armexidx.*)
+	} > FLASH
+	__exidx_end = .;
+
+	/* To copy multiple ROM to RAM sections,
+	 * uncomment .copy.table section and,
+	 * define __STARTUP_COPY_MULTIPLE in startup_ARMCMx.S */
+	/*
+	.copy.table :
+	{
+		. = ALIGN(4);
+		__copy_table_start__ = .;
+		LONG (__etext)
+		LONG (__data_start__)
+		LONG (__data_end__ - __data_start__)
+		LONG (__etext2)
+		LONG (__data2_start__)
+		LONG (__data2_end__ - __data2_start__)
+		__copy_table_end__ = .;
+	} > FLASH
+	*/
+
+	/* To clear multiple BSS sections,
+	 * uncomment .zero.table section and,
+	 * define __STARTUP_CLEAR_BSS_MULTIPLE in startup_ARMCMx.S */
+	/*
+	.zero.table :
+	{
+		. = ALIGN(4);
+		__zero_table_start__ = .;
+		LONG (__bss_start__)
+		LONG (__bss_end__ - __bss_start__)
+		LONG (__bss2_start__)
+		LONG (__bss2_end__ - __bss2_start__)
+		__zero_table_end__ = .;
+	} > FLASH
+	*/
+
+	__etext = .;
+  PROVIDE(__sketch_vectors_ptr = ORIGIN(FLASH) + LENGTH(FLASH));
+
+
+	.data : AT (__etext)
+	{
+		__data_start__ = .;
+		*(vtable)
+		*(.data*)
+
+		. = ALIGN(4);
+		/* preinit data */
+		PROVIDE_HIDDEN (__preinit_array_start = .);
+		KEEP(*(.preinit_array))
+		PROVIDE_HIDDEN (__preinit_array_end = .);
+
+		. = ALIGN(4);
+		/* init data */
+		PROVIDE_HIDDEN (__init_array_start = .);
+		KEEP(*(SORT(.init_array.*)))
+		KEEP(*(.init_array))
+		PROVIDE_HIDDEN (__init_array_end = .);
+
+
+		. = ALIGN(4);
+		/* finit data */
+		PROVIDE_HIDDEN (__fini_array_start = .);
+		KEEP(*(SORT(.fini_array.*)))
+		KEEP(*(.fini_array))
+		PROVIDE_HIDDEN (__fini_array_end = .);
+
+		KEEP(*(.jcr*))
+		. = ALIGN(4);
+		/* All data end */
+		__data_end__ = .;
+
+	} > RAM
+
+	.bss :
+	{
+		. = ALIGN(4);
+		__bss_start__ = .;
+		*(.bss*)
+		*(COMMON)
+		. = ALIGN(4);
+		__bss_end__ = .;
+	} > RAM
+
+	.heap (COPY):
+	{
+		__end__ = .;
+		PROVIDE(end = .);
+		*(.heap*)
+		__HeapLimit = .;
+	} > RAM
+
+	/* .stack_dummy section doesn't contains any symbols. It is only
+	 * used for linker to calculate size of stack sections, and assign
+	 * values to stack symbols later */
+	.stack_dummy (COPY):
+	{
+		*(.stack*)
+	} > RAM
+
+	/* Set stack top to end of RAM, and stack limit move down by
+	 * size of stack_dummy section */
+	__StackTop = ORIGIN(RAM) + LENGTH(RAM);
+	__StackLimit = __StackTop - SIZEOF(.stack_dummy);
+	PROVIDE(__stack = __StackTop);
+
+	__ram_end__ = ORIGIN(RAM) + LENGTH(RAM) -1 ;
+
+	/* Check if data + heap + stack exceeds RAM limit */
+	ASSERT(__StackLimit >= __HeapLimit, "region RAM overflowed with stack")
+}

bootloaders/metroM4/build_all_bootloaders.sh

@@ -0,0 +1,20 @@
+#!/bin/bash -ex
+
+BOARD_ID=arduino_zero NAME=samd21_sam_ba make clean all
+
+BOARD_ID=genuino_zero NAME=samd21_sam_ba_genuino make clean all
+
+BOARD_ID=arduino_mkr1000 NAME=samd21_sam_ba_arduino_mkr1000 make clean all
+mv -v samd21_sam_ba_arduino_mkr1000.* ../mkr1000/
+
+BOARD_ID=genuino_mkr1000 NAME=samd21_sam_ba_genuino_mkr1000 make clean all
+mv -v samd21_sam_ba_genuino_mkr1000.* ../mkr1000/
+
+BOARD_ID=arduino_mkrzero NAME=samd21_sam_ba_arduino_mkrzero make clean all
+mv -v samd21_sam_ba_arduino_mkrzero.* ../mkrzero/
+
+BOARD_ID=arduino_mkrfox1200 NAME=samd21_sam_ba_arduino_mkrfox1200 make clean all
+mv -v samd21_sam_ba_arduino_mkrfox1200.* ../mkrfox1200/
+
+echo Done building bootloaders!
+

bootloaders/metroM4/main.c

@@ -0,0 +1,235 @@
+/*
+  Copyright (c) 2015 Arduino LLC.  All right reserved.
+  Copyright (c) 2015 Atmel Corporation/Thibaut VIARD.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#include <stdio.h>
+#include <sam.h>
+#include "sam_ba_monitor.h"
+#include "sam_ba_serial.h"
+#include "board_definitions.h"
+#include "board_driver_led.h"
+#include "sam_ba_usb.h"
+#include "sam_ba_cdc.h"
+
+extern uint32_t __sketch_vectors_ptr; // Exported value from linker script
+extern void board_init(void);
+
+#if (defined DEBUG) && (DEBUG == 1)
+volatile uint32_t* pulSketch_Start_Address;
+#endif
+
+static volatile bool main_b_cdc_enable = false;
+
+/**
+ * \brief Check the application startup condition
+ *
+ */
+static void check_start_application(void)
+{
+//  LED_init();
+//  LED_off();
+
+#if (!defined DEBUG) || ((defined DEBUG) && (DEBUG == 0))
+uint32_t* pulSketch_Start_Address;
+#endif
+
+  /*
+   * Test sketch stack pointer @ &__sketch_vectors_ptr
+   * Stay in SAM-BA if value @ (&__sketch_vectors_ptr) == 0xFFFFFFFF (Erased flash cell value)
+   */
+  if (__sketch_vectors_ptr == 0xFFFFFFFF)
+  {
+    /* Stay in bootloader */
+    return;
+  }
+
+  /*
+   * Load the sketch Reset Handler address
+   * __sketch_vectors_ptr is exported from linker script and point on first 32b word of sketch vector table
+   * First 32b word is sketch stack
+   * Second 32b word is sketch entry point: Reset_Handler()
+   */
+  pulSketch_Start_Address = &__sketch_vectors_ptr ;
+  pulSketch_Start_Address++ ;
+
+  /*
+   * Test vector table address of sketch @ &__sketch_vectors_ptr
+   * Stay in SAM-BA if this function is not aligned enough, ie not valid
+   */
+  if ( ((uint32_t)(&__sketch_vectors_ptr) & ~SCB_VTOR_TBLOFF_Msk) != 0x00)
+  {
+    /* Stay in bootloader */
+    return;
+  }
+
+#if defined(BOOT_DOUBLE_TAP_ADDRESS)
+  #define DOUBLE_TAP_MAGIC 0xf01669efUL
+  //if (PM->RCAUSE.bit.POR)
+  if( RSTC->RCAUSE.bit.POR )
+  {
+    /* On power-on initialize double-tap */
+    BOOT_DOUBLE_TAP_DATA = 0;
+  }
+  else
+  {
+    if (BOOT_DOUBLE_TAP_DATA == DOUBLE_TAP_MAGIC)
+    {
+      /* Second tap, stay in bootloader */
+      BOOT_DOUBLE_TAP_DATA = 0;
+      return;
+    }
+
+    /* First tap */
+    BOOT_DOUBLE_TAP_DATA = DOUBLE_TAP_MAGIC;
+
+    /* Wait 0.5sec to see if the user tap reset again.
+     * The loop value is based on SAMD51 default 48Mhz clock @ reset.
+     */
+    for (uint32_t i=0; i<6000000; i++) /* 500ms */
+      /* force compiler to not optimize this... */
+      __asm__ __volatile__("");
+
+    /* Timeout happened, continue boot... */
+    BOOT_DOUBLE_TAP_DATA = 0;
+  }
+#endif
+
+/*
+#if defined(BOOT_LOAD_PIN)
+  volatile PortGroup *boot_port = (volatile PortGroup *)(&(PORT->Group[BOOT_LOAD_PIN / 32]));
+  volatile bool boot_en;
+
+  // Enable the input mode in Boot GPIO Pin
+  boot_port->DIRCLR.reg = BOOT_PIN_MASK;
+  boot_port->PINCFG[BOOT_LOAD_PIN & 0x1F].reg = PORT_PINCFG_INEN | PORT_PINCFG_PULLEN;
+  boot_port->OUTSET.reg = BOOT_PIN_MASK;
+  // Read the BOOT_LOAD_PIN status
+  boot_en = (boot_port->IN.reg) & BOOT_PIN_MASK;
+
+  // Check the bootloader enable condition
+  if (!boot_en)
+  {
+    // Stay in bootloader
+    return;
+  }
+#endif
+*/
+
+//  LED_on();
+
+  /* Rebase the Stack Pointer */
+  __set_MSP( (uint32_t)(__sketch_vectors_ptr) );
+
+  /* Rebase the vector table base address */
+  SCB->VTOR = ((uint32_t)(&__sketch_vectors_ptr) & SCB_VTOR_TBLOFF_Msk);
+
+  /* Jump to application Reset Handler in the application */
+  asm("bx %0"::"r"(*pulSketch_Start_Address));
+}
+
+#if DEBUG_ENABLE
+#	define DEBUG_PIN_HIGH 	port_pin_set_output_level(BOOT_LED, 1)
+#	define DEBUG_PIN_LOW 	port_pin_set_output_level(BOOT_LED, 0)
+#else
+#	define DEBUG_PIN_HIGH 	do{}while(0)
+#	define DEBUG_PIN_LOW 	do{}while(0)
+#endif
+
+/**
+ *  \brief SAMDx1 SAM-BA Main loop.
+ *  \return Unused (ANSI-C compatibility).
+ */
+int main(void)
+{
+#if SAM_BA_INTERFACE == SAM_BA_USBCDC_ONLY  ||  SAM_BA_INTERFACE == SAM_BA_BOTH_INTERFACES
+  P_USB_CDC pCdc;
+#endif
+  DEBUG_PIN_HIGH;
+
+  /* Jump in application if condition is satisfied */
+  check_start_application();
+
+  /* We have determined we should stay in the monitor. */
+  /* System initialization */
+  board_init();
+  __enable_irq();
+
+#if SAM_BA_INTERFACE == SAM_BA_UART_ONLY  ||  SAM_BA_INTERFACE == SAM_BA_BOTH_INTERFACES
+  /* UART is enabled in all cases */
+  serial_open();
+#endif
+
+#if SAM_BA_INTERFACE == SAM_BA_USBCDC_ONLY  ||  SAM_BA_INTERFACE == SAM_BA_BOTH_INTERFACES
+  pCdc = usb_init();
+#endif
+
+  DEBUG_PIN_LOW;
+
+  /* Initialize LEDs */
+  LED_init();
+  LEDRX_init();
+  LEDRX_off();
+  LEDTX_init();
+  LEDTX_off();
+
+  /* Start the sys tick (1 ms) */
+  SysTick_Config(1000);
+  
+  /* Wait for a complete enum on usb or a '#' char on serial line */
+  while (1)
+  {
+	  
+	  #if SAM_BA_INTERFACE == SAM_BA_USBCDC_ONLY  ||  SAM_BA_INTERFACE == SAM_BA_BOTH_INTERFACES
+	  if (pCdc->IsConfigured(pCdc) != 0)
+	  {
+		  main_b_cdc_enable = true;
+	  }
+
+	  /* Check if a USB enumeration has succeeded and if comm port has been opened */
+	  if (main_b_cdc_enable)
+	  {
+		  sam_ba_monitor_init(SAM_BA_INTERFACE_USBCDC);
+		  /* SAM-BA on USB loop */
+		  while( 1 )
+		  {
+			  sam_ba_monitor_run();
+		  }
+	  }
+	  #endif
+
+	  #if SAM_BA_INTERFACE == SAM_BA_UART_ONLY  ||  SAM_BA_INTERFACE == SAM_BA_BOTH_INTERFACES
+	  /* Check if a '#' has been received */
+	  if (!main_b_cdc_enable && serial_sharp_received())
+	  {
+		  sam_ba_monitor_init(SAM_BA_INTERFACE_USART);
+		  /* SAM-BA on Serial loop */
+		  while(1)
+		  {
+			  sam_ba_monitor_run();
+		  }
+	  }
+	  #endif
+  } 
+}
+
+void SysTick_Handler(void)
+{
+  LED_pulse();
+
+  sam_ba_monitor_sys_tick();
+}

bootloaders/metroM4/sam_ba_cdc.c

@@ -0,0 +1,98 @@
+/*
+  Copyright (c) 2015 Arduino LLC.  All right reserved.
+  Copyright (c) 2015 Atmel Corporation/Thibaut VIARD.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#include "sam_ba_cdc.h"
+#include "board_driver_usb.h"
+
+usb_cdc_line_coding_t line_coding=
+{
+  115200, // baudrate
+  0,      // 1 Stop Bit
+  0,      // None Parity
+  8     // 8 Data bits
+};
+
+#define pCdc (&sam_ba_cdc)
+
+int cdc_putc(/*P_USB_CDC pCdc,*/ int value)
+{
+  /* Send single byte on USB CDC */
+  USB_Write(pCdc->pUsb, (const char *)&value, 1, USB_EP_IN);
+
+  return 1;
+}
+
+int cdc_getc(/*P_USB_CDC pCdc*/void)
+{
+  uint8_t rx_char;
+
+  /* Read singly byte on USB CDC */
+  USB_Read(pCdc->pUsb, (char *)&rx_char, 1);
+
+  return (int)rx_char;
+}
+
+bool cdc_is_rx_ready(/*P_USB_CDC pCdc*/void)
+{
+  /* Check whether the device is configured */
+  if ( !USB_IsConfigured(pCdc) )
+    return 0;
+
+  /* Return transfer complete 0 flag status */
+  return (pCdc->pUsb->DEVICE.DeviceEndpoint[USB_EP_OUT].EPINTFLAG.bit.TRCPT0);
+}
+
+uint32_t cdc_write_buf(/*P_USB_CDC pCdc,*/ void const* data, uint32_t length)
+{
+  /* Send the specified number of bytes on USB CDC */
+  USB_Write(pCdc->pUsb, (const char *)data, length, USB_EP_IN);
+  return length;
+}
+
+uint32_t cdc_read_buf(/*P_USB_CDC pCdc,*/ void* data, uint32_t length)
+{
+  /* Check whether the device is configured */
+  if ( !USB_IsConfigured(pCdc) )
+    return 0;
+
+  /* Read from USB CDC */
+  return USB_Read(pCdc->pUsb, (char *)data, length);
+}
+
+uint32_t cdc_read_buf_xmd(/*P_USB_CDC pCdc,*/ void* data, uint32_t length)
+{
+  /* Check whether the device is configured */
+  if ( !USB_IsConfigured(pCdc) )
+    return 0;
+
+  /* Blocking read till specified number of bytes is received */
+  // XXX: USB_Read_blocking is not reliable
+  // return USB_Read_blocking(pCdc, (char *)data, length);
+
+  char *dst = (char *)data;
+  uint32_t remaining = length;
+  while (remaining)
+  {
+    uint32_t readed = USB_Read(pCdc->pUsb, (char *)dst, remaining);
+    remaining -= readed;
+    dst += readed;
+  }
+
+  return length;
+}

bootloaders/metroM4/sam_ba_cdc.h

@@ -0,0 +1,91 @@
+/*
+  Copyright (c) 2015 Arduino LLC.  All right reserved.
+  Copyright (c) 2015 Atmel Corporation/Thibaut VIARD.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#ifndef _SAM_BA_USB_CDC_H_
+#define _SAM_BA_USB_CDC_H_
+
+#include <stdint.h>
+#include "sam_ba_usb.h"
+
+typedef struct
+{
+	uint32_t dwDTERate;
+	uint8_t bCharFormat;
+	uint8_t bParityType;
+	uint8_t bDataBits;
+} usb_cdc_line_coding_t;
+
+/* CDC Class Specific Request Code */
+#define GET_LINE_CODING               0x21A1
+#define SET_LINE_CODING               0x2021
+#define SET_CONTROL_LINE_STATE        0x2221
+
+extern usb_cdc_line_coding_t line_coding;
+
+
+/**
+ * \brief Sends a single byte through USB CDC
+ *
+ * \param Data to send
+ * \return number of data sent
+ */
+int cdc_putc(/*P_USB_CDC pCdc,*/ int value);
+
+/**
+ * \brief Reads a single byte through USB CDC
+ *
+ * \return Data read through USB
+ */
+int cdc_getc(/*P_USB_CDC pCdc*/);
+
+/**
+ * \brief Checks if a character has been received on USB CDC
+ *
+ * \return \c 1 if a byte is ready to be read.
+ */
+bool cdc_is_rx_ready(/*P_USB_CDC pCdc*/);
+
+/**
+ * \brief Sends buffer on USB CDC
+ *
+ * \param data pointer
+ * \param number of data to send
+ * \return number of data sent
+ */
+uint32_t cdc_write_buf(/*P_USB_CDC pCdc,*/ void const* data, uint32_t length);
+
+/**
+ * \brief Gets data on USB CDC
+ *
+ * \param data pointer
+ * \param number of data to read
+ * \return number of data read
+ */
+uint32_t cdc_read_buf(/*P_USB_CDC pCdc,*/ void* data, uint32_t length);
+
+/**
+ * \brief Gets specified number of bytes on USB CDC
+ *
+ * \param data pointer
+ * \param number of data to read
+ * \return number of data read
+ */
+uint32_t cdc_read_buf_xmd(/*P_USB_CDC pCdc,*/ void* data, uint32_t length);
+
+#endif // _SAM_BA_USB_CDC_H_

bootloaders/metroM4/sam_ba_monitor.c

@@ -0,0 +1,552 @@
+/*
+  Copyright (c) 2015 Arduino LLC.  All right reserved.
+  Copyright (c) 2015 Atmel Corporation/Thibaut VIARD.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#include "sam.h"
+#include <string.h>
+#include "sam_ba_monitor.h"
+#include "sam_ba_serial.h"
+#include "board_driver_serial.h"
+#include "board_driver_usb.h"
+#include "sam_ba_usb.h"
+#include "sam_ba_cdc.h"
+#include "board_driver_led.h"
+
+const char RomBOOT_Version[] = SAM_BA_VERSION;
+const char RomBOOT_ExtendedCapabilities[] = "[Arduino:XYZ]";
+
+/* Provides one common interface to handle both USART and USB-CDC */
+typedef struct
+{
+  /* send one byte of data */
+  int (*put_c)(int value);
+  /* Get one byte */
+  int (*get_c)(void);
+  /* Receive buffer not empty */
+  bool (*is_rx_ready)(void);
+  /* Send given data (polling) */
+  uint32_t (*putdata)(void const* data, uint32_t length);
+  /* Get data from comm. device */
+  uint32_t (*getdata)(void* data, uint32_t length);
+  /* Send given data (polling) using xmodem (if necessary) */
+  uint32_t (*putdata_xmd)(void const* data, uint32_t length);
+  /* Get data from comm. device using xmodem (if necessary) */
+  uint32_t (*getdata_xmd)(void* data, uint32_t length);
+} t_monitor_if;
+
+#if SAM_BA_INTERFACE == SAM_BA_UART_ONLY  ||  SAM_BA_INTERFACE == SAM_BA_BOTH_INTERFACES
+/* Initialize structures with function pointers from supported interfaces */
+const t_monitor_if uart_if =
+{
+  .put_c =       serial_putc,
+  .get_c =       serial_getc,
+  .is_rx_ready = serial_is_rx_ready,
+  .putdata =     serial_putdata,
+  .getdata =     serial_getdata,
+  .putdata_xmd = serial_putdata_xmd,
+  .getdata_xmd = serial_getdata_xmd
+};
+#endif
+
+#if SAM_BA_INTERFACE == SAM_BA_USBCDC_ONLY  ||  SAM_BA_INTERFACE == SAM_BA_BOTH_INTERFACES
+//Please note that USB doesn't use Xmodem protocol, since USB already includes flow control and data verification
+//Data are simply forwarded without further coding.
+const t_monitor_if usbcdc_if =
+{
+  .put_c =         cdc_putc,
+  .get_c =         cdc_getc,
+  .is_rx_ready =   cdc_is_rx_ready,
+  .putdata =       cdc_write_buf,
+  .getdata =       cdc_read_buf,
+  .putdata_xmd =   cdc_write_buf,
+  .getdata_xmd =   cdc_read_buf_xmd
+};
+#endif
+
+/* The pointer to the interface object use by the monitor */
+t_monitor_if * ptr_monitor_if;
+
+/* b_terminal_mode mode (ascii) or hex mode */
+volatile bool b_terminal_mode = false;
+volatile bool b_sam_ba_interface_usart = false;
+
+/* Pulse generation counters to keep track of the time remaining for each pulse type */
+#define TX_RX_LED_PULSE_PERIOD 100
+volatile uint16_t txLEDPulse = 0; // time remaining for Tx LED pulse
+volatile uint16_t rxLEDPulse = 0; // time remaining for Rx LED pulse
+
+void sam_ba_monitor_init(uint8_t com_interface)
+{
+#if SAM_BA_INTERFACE == SAM_BA_UART_ONLY  ||  SAM_BA_INTERFACE == SAM_BA_BOTH_INTERFACES
+  //Selects the requested interface for future actions
+  if (com_interface == SAM_BA_INTERFACE_USART)
+  {
+    ptr_monitor_if = (t_monitor_if*) &uart_if;
+    b_sam_ba_interface_usart = true;
+  }
+#endif
+#if SAM_BA_INTERFACE == SAM_BA_USBCDC_ONLY  ||  SAM_BA_INTERFACE == SAM_BA_BOTH_INTERFACES
+  if (com_interface == SAM_BA_INTERFACE_USBCDC)
+  {
+    ptr_monitor_if = (t_monitor_if*) &usbcdc_if;
+  }
+#endif
+}
+
+/*
+ * Central SAM-BA monitor putdata function using the board LEDs
+ */
+static uint32_t sam_ba_putdata(t_monitor_if* pInterface, void const* data, uint32_t length)
+{
+	uint32_t result ;
+
+	result=pInterface->putdata(data, length);
+
+	LEDTX_on();
+	txLEDPulse = TX_RX_LED_PULSE_PERIOD;
+
+	return result;
+}
+
+/*
+ * Central SAM-BA monitor getdata function using the board LEDs
+ */
+static uint32_t sam_ba_getdata(t_monitor_if* pInterface, void* data, uint32_t length)
+{
+	uint32_t result ;
+
+	result=pInterface->getdata(data, length);
+
+	if (result)
+	{
+		LEDRX_on();
+		rxLEDPulse = TX_RX_LED_PULSE_PERIOD;
+	}
+
+	return result;
+}
+
+/*
+ * Central SAM-BA monitor putdata function using the board LEDs
+ */
+static uint32_t sam_ba_putdata_xmd(t_monitor_if* pInterface, void const* data, uint32_t length)
+{
+	uint32_t result ;
+
+	result=pInterface->putdata_xmd(data, length);
+
+	LEDTX_on();
+	txLEDPulse = TX_RX_LED_PULSE_PERIOD;
+
+	return result;
+}
+
+/*
+ * Central SAM-BA monitor getdata function using the board LEDs
+ */
+static uint32_t sam_ba_getdata_xmd(t_monitor_if* pInterface, void* data, uint32_t length)
+{
+	uint32_t result ;
+
+	result=pInterface->getdata_xmd(data, length);
+
+	if (result)
+	{
+		LEDRX_on();
+		rxLEDPulse = TX_RX_LED_PULSE_PERIOD;
+	}
+
+	return result;
+}
+
+/**
+ * \brief This function allows data emission by USART
+ *
+ * \param *data  Data pointer
+ * \param length Length of the data
+ */
+void sam_ba_putdata_term(uint8_t* data, uint32_t length)
+{
+  uint8_t temp, buf[12], *data_ascii;
+  uint32_t i, int_value;
+
+  if (b_terminal_mode)
+  {
+    if (length == 4)
+      int_value = *(uint32_t *) data;
+    else if (length == 2)
+      int_value = *(uint16_t *) data;
+    else
+      int_value = *(uint8_t *) data;
+
+    data_ascii = buf + 2;
+    data_ascii += length * 2 - 1;
+
+    for (i = 0; i < length * 2; i++)
+    {
+      temp = (uint8_t) (int_value & 0xf);
+
+      if (temp <= 0x9)
+        *data_ascii = temp | 0x30;
+      else
+        *data_ascii = temp + 0x37;
+
+      int_value >>= 4;
+      data_ascii--;
+    }
+    buf[0] = '0';
+    buf[1] = 'x';
+    buf[length * 2 + 2] = '\n';
+    buf[length * 2 + 3] = '\r';
+    sam_ba_putdata(ptr_monitor_if, buf, length * 2 + 4);
+  }
+  else
+    sam_ba_putdata(ptr_monitor_if, data, length);
+  return;
+}
+
+volatile uint32_t sp;
+void call_applet(uint32_t address)
+{
+  uint32_t app_start_address;
+
+  __disable_irq();
+
+  sp = __get_MSP();
+
+  /* Rebase the Stack Pointer */
+  __set_MSP(*(uint32_t *) address);
+
+  /* Load the Reset Handler address of the application */
+  app_start_address = *(uint32_t *)(address + 4);
+
+  /* Jump to application Reset Handler in the application */
+  asm("bx %0"::"r"(app_start_address));
+}
+
+uint32_t current_number;
+uint32_t i, length;
+uint8_t command, *ptr_data, *ptr, data[SIZEBUFMAX];
+uint8_t j;
+uint32_t u32tmp;
+
+uint32_t PAGE_SIZE, PAGES, MAX_FLASH;
+
+// Prints a 32-bit integer in hex.
+static void put_uint32(uint32_t n)
+{
+  char buff[8];
+  int i;
+  for (i=0; i<8; i++)
+  {
+    int d = n & 0XF;
+    n = (n >> 4);
+
+    buff[7-i] = d > 9 ? 'A' + d - 10 : '0' + d;
+  }
+  sam_ba_putdata( ptr_monitor_if, buff, 8);
+}
+
+static void sam_ba_monitor_loop(void)
+{
+  length = sam_ba_getdata(ptr_monitor_if, data, SIZEBUFMAX);
+  ptr = data;
+
+  for (i = 0; i < length; i++, ptr++)
+  {
+    if (*ptr == 0xff) continue;
+
+    if (*ptr == '#')
+    {
+      if (b_terminal_mode)
+      {
+        sam_ba_putdata(ptr_monitor_if, "\n\r", 2);
+      }
+      if (command == 'S')
+      {
+        //Check if some data are remaining in the "data" buffer
+        if(length>i)
+        {
+          //Move current indexes to next avail data (currently ptr points to "#")
+          ptr++;
+          i++;
+
+          //We need to add first the remaining data of the current buffer already read from usb
+          //read a maximum of "current_number" bytes
+          if ((length-i) < current_number)
+          {
+            u32tmp=(length-i);
+          }
+          else
+          {
+            u32tmp=current_number;
+          }
+
+          memcpy(ptr_data, ptr, u32tmp);
+          i += u32tmp;
+          ptr += u32tmp;
+          j = u32tmp;
+        }
+        //update i with the data read from the buffer
+        i--;
+        ptr--;
+        //Do we expect more data ?
+        if(j<current_number)
+          sam_ba_getdata_xmd(ptr_monitor_if, ptr_data, current_number-j);
+
+        __asm("nop");
+      }
+      else if (command == 'R')
+      {
+        sam_ba_putdata_xmd(ptr_monitor_if, ptr_data, current_number);
+      }
+      else if (command == 'O')
+      {
+        *ptr_data = (char) current_number;
+      }
+      else if (command == 'H')
+      {
+        *((uint16_t *) ptr_data) = (uint16_t) current_number;
+      }
+      else if (command == 'W')
+      {
+        *((int *) ptr_data) = current_number;
+      }
+      else if (command == 'o')
+      {
+        sam_ba_putdata_term(ptr_data, 1);
+      }
+      else if (command == 'h')
+      {
+        current_number = *((uint16_t *) ptr_data);
+        sam_ba_putdata_term((uint8_t*) &current_number, 2);
+      }
+      else if (command == 'w')
+      {
+        current_number = *((uint32_t *) ptr_data);
+        sam_ba_putdata_term((uint8_t*) &current_number, 4);
+      }
+      else if (command == 'G')
+      {
+        call_applet(current_number);
+        /* Rebase the Stack Pointer */
+        __set_MSP(sp);
+        __enable_irq();
+        if (b_sam_ba_interface_usart) {
+          ptr_monitor_if->put_c(0x6);
+        }
+      }
+      else if (command == 'T')
+      {
+        b_terminal_mode = 1;
+        sam_ba_putdata(ptr_monitor_if, "\n\r", 2);
+      }
+      else if (command == 'N')
+      {
+        if (b_terminal_mode == 0)
+        {
+          sam_ba_putdata( ptr_monitor_if, "\n\r", 2);
+        }
+        b_terminal_mode = 0;
+      }
+      else if (command == 'V')
+      {
+        sam_ba_putdata( ptr_monitor_if, "v", 1);
+        sam_ba_putdata( ptr_monitor_if, (uint8_t *) RomBOOT_Version, strlen(RomBOOT_Version));
+        sam_ba_putdata( ptr_monitor_if, " ", 1);
+        sam_ba_putdata( ptr_monitor_if, (uint8_t *) RomBOOT_ExtendedCapabilities, strlen(RomBOOT_ExtendedCapabilities));
+        sam_ba_putdata( ptr_monitor_if, " ", 1);
+        ptr = (uint8_t*) &(__DATE__);
+        i = 0;
+        while (*ptr++ != '\0')
+          i++;
+        sam_ba_putdata( ptr_monitor_if, (uint8_t *) &(__DATE__), i);
+        sam_ba_putdata( ptr_monitor_if, " ", 1);
+        i = 0;
+        ptr = (uint8_t*) &(__TIME__);
+        while (*ptr++ != '\0')
+          i++;
+        sam_ba_putdata( ptr_monitor_if, (uint8_t *) &(__TIME__), i);
+        sam_ba_putdata( ptr_monitor_if, "\n\r", 2);
+      }
+      else if (command == 'X')
+      {
+        // Syntax: X[ADDR]#
+        // Erase the flash memory starting from ADDR to the end of flash.
+		
+		//block size 16 pages
+
+        uint32_t dst_addr = current_number; // starting address
+
+        while (dst_addr < MAX_FLASH)
+        {
+		  while (NVMCTRL->STATUS.bit.READY == 0);
+          // Execute "EB" Erase Block
+		  NVMCTRL->ADDR.reg = dst_addr;
+          NVMCTRL->CTRLB.reg = NVMCTRL_CTRLB_CMDEX_KEY | NVMCTRL_CTRLB_CMD_EB;
+		  while (NVMCTRL->STATUS.bit.READY == 0);
+		  
+          dst_addr += PAGE_SIZE * 16; // Skip a block
+        }
+
+        // Notify command completed
+        sam_ba_putdata( ptr_monitor_if, "X\n\r", 3);
+      }
+      else if (command == 'Y')
+      {
+        // This command writes the content of a buffer in SRAM into flash memory.
+
+        // Syntax: Y[ADDR],0#
+        // Set the starting address of the SRAM buffer.
+
+        // Syntax: Y[ROM_ADDR],[SIZE]#
+        // Write the first SIZE bytes from the SRAM buffer (previously set) into
+        // flash memory starting from address ROM_ADDR
+
+        static uint32_t *src_buff_addr = NULL;
+
+        if (current_number == 0)
+        {
+          // Set buffer address
+          src_buff_addr = (uint32_t*)ptr_data;
+        }
+        else
+        {
+          // Write to flash
+          uint32_t size = current_number/4;
+          uint32_t *src_addr = src_buff_addr;
+          uint32_t *dst_addr = (uint32_t*)ptr_data;
+
+          // Set automatic page write
+		  NVMCTRL->CTRLA.reg |= NVMCTRL_CTRLA_WMODE(NVMCTRL_CTRLA_WMODE_AP);
+
+          // Do writes in pages
+          while (size)
+          {
+            // Execute "PBC" Page Buffer Clear
+			NVMCTRL->CTRLB.reg = NVMCTRL_CTRLB_CMDEX_KEY | NVMCTRL_CTRLB_CMD_PBC;
+			while (NVMCTRL->STATUS.bit.READY == 0)
+              ;
+
+            // Fill page buffer
+            uint32_t i;
+            for (i=0; i<(PAGE_SIZE/4) && i<size; i++)
+            {
+              dst_addr[i] = src_addr[i];
+            }
+
+            // Execute "WP" Write Page
+			NVMCTRL->ADDR.reg = ((uint32_t)dst_addr);
+			NVMCTRL->CTRLB.reg = NVMCTRL_CTRLB_CMDEX_KEY | NVMCTRL_CTRLB_CMD_WP;
+			while (NVMCTRL->STATUS.bit.READY == 0)
+              ;
+
+            // Advance to next page
+            dst_addr += i;
+            src_addr += i;
+            size     -= i;
+          }
+        }
+
+        // Notify command completed
+        sam_ba_putdata( ptr_monitor_if, "Y\n\r", 3);
+      }
+      else if (command == 'Z')
+      {
+        // This command calculate CRC for a given area of memory.
+        // It's useful to quickly check if a transfer has been done
+        // successfully.
+
+        // Syntax: Z[START_ADDR],[SIZE]#
+        // Returns: Z[CRC]#
+
+        uint8_t *data = (uint8_t *)ptr_data;
+        uint32_t size = current_number;
+        uint16_t crc = 0;
+        uint32_t i = 0;
+        for (i=0; i<size; i++)
+          crc = serial_add_crc(*data++, crc);
+
+        // Send response
+        sam_ba_putdata( ptr_monitor_if, "Z", 1);
+        put_uint32(crc);
+        sam_ba_putdata( ptr_monitor_if, "#\n\r", 3);
+      }
+
+      command = 'z';
+      current_number = 0;
+
+      if (b_terminal_mode)
+      {
+        sam_ba_putdata( ptr_monitor_if, ">", 1);
+      }
+    }
+    else
+    {
+      if (('0' <= *ptr) && (*ptr <= '9'))
+      {
+        current_number = (current_number << 4) | (*ptr - '0');
+      }
+      else if (('A' <= *ptr) && (*ptr <= 'F'))
+      {
+        current_number = (current_number << 4) | (*ptr - 'A' + 0xa);
+      }
+      else if (('a' <= *ptr) && (*ptr <= 'f'))
+      {
+        current_number = (current_number << 4) | (*ptr - 'a' + 0xa);
+      }
+      else if (*ptr == ',')
+      {
+        ptr_data = (uint8_t *) current_number;
+        current_number = 0;
+      }
+      else
+      {
+        command = *ptr;
+        current_number = 0;
+      }
+    }
+  }
+}
+
+void sam_ba_monitor_sys_tick(void)
+{
+	/* Check whether the TX or RX LED one-shot period has elapsed.  if so, turn off the LED */
+	if (txLEDPulse && !(--txLEDPulse))
+		LEDTX_off();
+	if (rxLEDPulse && !(--rxLEDPulse))
+		LEDRX_off();
+}
+
+/**
+ * \brief This function starts the SAM-BA monitor.
+ */
+void sam_ba_monitor_run(void)
+{
+  uint32_t pageSizes[] = { 8, 16, 32, 64, 128, 256, 512, 1024 };
+  PAGE_SIZE = pageSizes[NVMCTRL->PARAM.bit.PSZ];
+  PAGES = NVMCTRL->PARAM.bit.NVMP;
+  MAX_FLASH = PAGE_SIZE * PAGES;
+
+  ptr_data = NULL;
+  command = 'z';
+  while (1)
+  {
+    sam_ba_monitor_loop();
+  }
+}

bootloaders/metroM4/sam_ba_monitor.h

@@ -0,0 +1,72 @@
+/*
+  Copyright (c) 2015 Arduino LLC.  All right reserved.
+  Copyright (c) 2015 Atmel Corporation/Thibaut VIARD.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#ifndef _MONITOR_SAM_BA_H_
+#define _MONITOR_SAM_BA_H_
+
+#define SAM_BA_VERSION              "2.0"
+
+/* Enable the interfaces to save code size */
+#define SAM_BA_BOTH_INTERFACES      0
+#define SAM_BA_UART_ONLY            1
+#define SAM_BA_USBCDC_ONLY          2
+
+#ifndef SAM_BA_INTERFACE
+#define SAM_BA_INTERFACE    SAM_BA_BOTH_INTERFACES
+#endif
+
+/* Selects USB as the communication interface of the monitor */
+#define SAM_BA_INTERFACE_USBCDC     0
+/* Selects USART as the communication interface of the monitor */
+#define SAM_BA_INTERFACE_USART      1
+
+/* Selects USB as the communication interface of the monitor */
+#define SIZEBUFMAX                  64
+
+/**
+ * \brief Initialize the monitor
+ *
+ */
+void sam_ba_monitor_init(uint8_t com_interface);
+
+/**
+ * \brief System tick function of the SAM-BA Monitor
+ *
+ */
+void sam_ba_monitor_sys_tick(void);
+
+/**
+ * \brief Main function of the SAM-BA Monitor
+ *
+ */
+void sam_ba_monitor_run(void);
+
+/**
+ * \brief
+ *
+ */
+void sam_ba_putdata_term(uint8_t* data, uint32_t length);
+
+/**
+ * \brief
+ *
+ */
+void call_applet(uint32_t address);
+
+#endif // _MONITOR_SAM_BA_H_

bootloaders/metroM4/sam_ba_serial.c

@@ -0,0 +1,529 @@
+/*
+  Copyright (c) 2015 Arduino LLC.  All right reserved.
+  Copyright (c) 2015 Atmel Corporation/Thibaut VIARD.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#include <sam.h>
+#include "board_definitions.h"
+#include "sam_ba_serial.h"
+#include "board_driver_serial.h"
+
+/* Local reference to current Usart instance in use with this driver */
+//struct usart_module usart_sam_ba;
+
+/* Variable to let the main task select the appropriate communication interface */
+volatile uint8_t b_sharp_received;
+
+/* RX and TX Buffers + rw pointers for each buffer */
+volatile uint8_t buffer_rx_usart[USART_BUFFER_SIZE];
+
+volatile uint8_t idx_rx_read;
+volatile uint8_t idx_rx_write;
+
+volatile uint8_t buffer_tx_usart[USART_BUFFER_SIZE];
+
+volatile uint8_t idx_tx_read;
+volatile uint8_t idx_tx_write;
+
+/* Test for timeout in AT91F_GetChar */
+uint8_t error_timeout;
+uint16_t size_of_data;
+uint8_t mode_of_transfer;
+
+#define BOOT_USART_PAD(n) BOOT_USART_PAD##n
+
+#define GPIO_PIN(n) (((n)&0x1Fu) << 0)
+#define GPIO_PORT(n) ((n) >> 5)
+
+/**
+ * \brief Open the given USART
+ */
+void serial_open(void)
+{
+	uint32_t port;
+	uint32_t pin;
+	  
+	GCLK->PCHCTRL[BOOT_GCLK_ID_CORE].reg = GCLK_PCHCTRL_GEN_GCLK0_Val | (1 << GCLK_PCHCTRL_CHEN_Pos);
+	GCLK->PCHCTRL[BOOT_GCLK_ID_SLOW].reg = GCLK_PCHCTRL_GEN_GCLK3_Val | (1 << GCLK_PCHCTRL_CHEN_Pos);
+	
+	MCLK->BOOK_USART_MASK.reg |= BOOT_USART_BUS_CLOCK_INDEX ;
+	
+	/* Configure the port pins for SERCOM_USART */
+	if (BOOT_USART_PAD0 != PINMUX_UNUSED)
+  {
+		/* Mask 6th bit in pin number to check whether it is greater than 32 i.e., PORTB pin */
+		port = (BOOT_USART_PAD0 & 0x200000) >> 21;
+		pin = (BOOT_USART_PAD0 >> 16);
+		PORT->Group[port].PINCFG[(pin - (port*32))].bit.PMUXEN = 1;
+		PORT->Group[port].PMUX[(pin - (port*32))/2].reg &= ~(0xF << (4 * (pin & 0x01u)));
+		PORT->Group[port].PMUX[(pin - (port*32))/2].reg |= (BOOT_USART_PAD0 & 0xFF) << (4 * (pin & 0x01u));
+	}
+
+	if (BOOT_USART_PAD1 != PINMUX_UNUSED)
+  {
+		/* Mask 6th bit in pin number to check whether it is greater than 32 i.e., PORTB pin */
+		port = (BOOT_USART_PAD1 & 0x200000) >> 21;
+		pin = BOOT_USART_PAD1 >> 16;
+		PORT->Group[port].PINCFG[(pin - (port*32))].bit.PMUXEN = 1;
+		PORT->Group[port].PMUX[(pin - (port*32))/2].reg &= ~(0xF << (4 * (pin & 0x01u)));
+		PORT->Group[port].PMUX[(pin - (port*32))/2].reg |= (BOOT_USART_PAD1 & 0xFF) << (4 * (pin & 0x01u));
+	}
+
+	if (BOOT_USART_PAD2 != PINMUX_UNUSED)
+  {
+		/* Mask 6th bit in pin number to check whether it is greater than 32 i.e., PORTB pin */
+		port = (BOOT_USART_PAD2 & 0x200000) >> 21;
+		pin = BOOT_USART_PAD2 >> 16;
+		PORT->Group[port].PINCFG[(pin - (port*32))].bit.PMUXEN = 1;
+		PORT->Group[port].PMUX[(pin - (port*32))/2].reg &= ~(0xF << (4 * (pin & 0x01u)));
+		PORT->Group[port].PMUX[(pin - (port*32))/2].reg |= (BOOT_USART_PAD2 & 0xFF) << (4 * (pin & 0x01u));
+	}
+
+	if (BOOT_USART_PAD3 != PINMUX_UNUSED)
+  {
+		/* Mask 6th bit in pin number to check whether it is greater than 32 i.e., PORTB pin */
+		port = (BOOT_USART_PAD3 & 0x200000) >> 21;
+		pin = BOOT_USART_PAD3 >> 16;
+		PORT->Group[port].PINCFG[(pin - (port*32))].bit.PMUXEN = 1;
+		PORT->Group[port].PMUX[(pin - (port*32))/2].reg &= ~(0xF << (4 * (pin & 0x01u)));
+		PORT->Group[port].PMUX[(pin - (port*32))/2].reg |= (BOOT_USART_PAD3 & 0xFF) << (4 * (pin & 0x01u));
+	}
+
+	/* Baud rate 115200 - clock 48MHz -> BAUD value-63018 */
+	uart_basic_init(BOOT_USART_MODULE, 63018, BOOT_USART_PAD_SETTINGS);
+
+	//Initialize flag
+	b_sharp_received = false;
+	idx_rx_read = 0;
+	idx_rx_write = 0;
+	idx_tx_read = 0;
+	idx_tx_write = 0;
+
+	error_timeout = 0;
+}
+
+/**
+ * \brief Close communication line
+ */
+void serial_close(void)
+{
+	uart_disable(BOOT_USART_MODULE);
+}
+
+/**
+ * \brief Puts a byte on usart line
+ * The type int is used to support printf redirection from compiler LIB.
+ *
+ * \param value      Value to put
+ *
+ * \return \c 1 if function was successfully done, otherwise \c 0.
+ */
+int serial_putc(int value)
+{	
+	uart_write_byte(BOOT_USART_MODULE, (uint8_t)value);
+	return 1;
+}
+
+int serial_getc(void)
+{
+	uint16_t retval;
+	//Wait until input buffer is filled
+	while(!(serial_is_rx_ready()));
+	retval = (uint16_t)uart_read_byte(BOOT_USART_MODULE);
+	//usart_read_wait(&usart_sam_ba, &retval);
+	return (int)retval;
+
+}
+
+int serial_sharp_received(void)
+{
+	if (serial_is_rx_ready())
+  {
+		if (serial_getc() == SHARP_CHARACTER)
+			return (true);
+	}
+	return (false);
+}
+
+bool serial_is_rx_ready(void)
+{
+	return (BOOT_USART_MODULE->USART.INTFLAG.reg & SERCOM_USART_INTFLAG_RXC);
+}
+
+int serial_readc(void)
+{
+	int retval;
+	retval = buffer_rx_usart[idx_rx_read];
+	idx_rx_read = (idx_rx_read + 1) & (USART_BUFFER_SIZE - 1);
+	return (retval);
+}
+
+//Send given data (polling)
+uint32_t serial_putdata(void const* data, uint32_t length)
+{
+	uint32_t i;
+	uint8_t* ptrdata;
+	ptrdata = (uint8_t*) data;
+	for (i = 0; i < length; i++)
+  {
+		serial_putc(*ptrdata);
+		ptrdata++;
+	}
+	return (i);
+}
+
+//Get data from comm. device
+uint32_t serial_getdata(void* data, uint32_t length)
+{
+	uint8_t* ptrdata;
+	ptrdata = (uint8_t*) data;
+	*ptrdata = serial_getc();
+	return (1);
+}
+
+static const uint16_t crc16Table[256]=
+{
+	0x0000,0x1021,0x2042,0x3063,0x4084,0x50a5,0x60c6,0x70e7,
+	0x8108,0x9129,0xa14a,0xb16b,0xc18c,0xd1ad,0xe1ce,0xf1ef,
+	0x1231,0x0210,0x3273,0x2252,0x52b5,0x4294,0x72f7,0x62d6,
+	0x9339,0x8318,0xb37b,0xa35a,0xd3bd,0xc39c,0xf3ff,0xe3de,
+	0x2462,0x3443,0x0420,0x1401,0x64e6,0x74c7,0x44a4,0x5485,
+	0xa56a,0xb54b,0x8528,0x9509,0xe5ee,0xf5cf,0xc5ac,0xd58d,
+	0x3653,0x2672,0x1611,0x0630,0x76d7,0x66f6,0x5695,0x46b4,
+	0xb75b,0xa77a,0x9719,0x8738,0xf7df,0xe7fe,0xd79d,0xc7bc,
+	0x48c4,0x58e5,0x6886,0x78a7,0x0840,0x1861,0x2802,0x3823,
+	0xc9cc,0xd9ed,0xe98e,0xf9af,0x8948,0x9969,0xa90a,0xb92b,
+	0x5af5,0x4ad4,0x7ab7,0x6a96,0x1a71,0x0a50,0x3a33,0x2a12,
+	0xdbfd,0xcbdc,0xfbbf,0xeb9e,0x9b79,0x8b58,0xbb3b,0xab1a,
+	0x6ca6,0x7c87,0x4ce4,0x5cc5,0x2c22,0x3c03,0x0c60,0x1c41,
+	0xedae,0xfd8f,0xcdec,0xddcd,0xad2a,0xbd0b,0x8d68,0x9d49,
+	0x7e97,0x6eb6,0x5ed5,0x4ef4,0x3e13,0x2e32,0x1e51,0x0e70,
+	0xff9f,0xefbe,0xdfdd,0xcffc,0xbf1b,0xaf3a,0x9f59,0x8f78,
+	0x9188,0x81a9,0xb1ca,0xa1eb,0xd10c,0xc12d,0xf14e,0xe16f,
+	0x1080,0x00a1,0x30c2,0x20e3,0x5004,0x4025,0x7046,0x6067,
+	0x83b9,0x9398,0xa3fb,0xb3da,0xc33d,0xd31c,0xe37f,0xf35e,
+	0x02b1,0x1290,0x22f3,0x32d2,0x4235,0x5214,0x6277,0x7256,
+	0xb5ea,0xa5cb,0x95a8,0x8589,0xf56e,0xe54f,0xd52c,0xc50d,
+	0x34e2,0x24c3,0x14a0,0x0481,0x7466,0x6447,0x5424,0x4405,
+	0xa7db,0xb7fa,0x8799,0x97b8,0xe75f,0xf77e,0xc71d,0xd73c,
+	0x26d3,0x36f2,0x0691,0x16b0,0x6657,0x7676,0x4615,0x5634,
+	0xd94c,0xc96d,0xf90e,0xe92f,0x99c8,0x89e9,0xb98a,0xa9ab,
+	0x5844,0x4865,0x7806,0x6827,0x18c0,0x08e1,0x3882,0x28a3,
+	0xcb7d,0xdb5c,0xeb3f,0xfb1e,0x8bf9,0x9bd8,0xabbb,0xbb9a,
+	0x4a75,0x5a54,0x6a37,0x7a16,0x0af1,0x1ad0,0x2ab3,0x3a92,
+	0xfd2e,0xed0f,0xdd6c,0xcd4d,0xbdaa,0xad8b,0x9de8,0x8dc9,
+	0x7c26,0x6c07,0x5c64,0x4c45,0x3ca2,0x2c83,0x1ce0,0x0cc1,
+	0xef1f,0xff3e,0xcf5d,0xdf7c,0xaf9b,0xbfba,0x8fd9,0x9ff8,
+	0x6e17,0x7e36,0x4e55,0x5e74,0x2e93,0x3eb2,0x0ed1,0x1ef0
+};
+
+//*----------------------------------------------------------------------------
+//* \brief Compute the CRC
+//*----------------------------------------------------------------------------
+unsigned short serial_add_crc(char ptr, unsigned short crc)
+{
+	return (crc << 8) ^ crc16Table[((crc >> 8) ^ ptr) & 0xff];
+}
+
+//*----------------------------------------------------------------------------
+//* \brief
+//*----------------------------------------------------------------------------
+static uint16_t getbytes(uint8_t *ptr_data, uint16_t length)
+{
+	uint16_t crc = 0;
+	uint16_t cpt;
+	uint8_t c;
+
+	for (cpt = 0; cpt < length; ++cpt)
+  {
+		c = serial_getc();
+		if (error_timeout)
+			return 1;
+		crc = serial_add_crc(c, crc);
+		//crc = (crc << 8) ^ xcrc16tab[(crc>>8) ^ c];
+		if (size_of_data || mode_of_transfer)
+    {
+			*ptr_data++ = c;
+			if (length == PKTLEN_128)
+				size_of_data--;
+		}
+	}
+
+	return crc;
+}
+
+//*----------------------------------------------------------------------------
+//* \brief Used by Xup to send packets.
+//*----------------------------------------------------------------------------
+static int putPacket(uint8_t *tmppkt, uint8_t sno)
+{
+	uint32_t i;
+	uint16_t chksm;
+	uint8_t data;
+
+	chksm = 0;
+
+	serial_putc(SOH);
+
+	serial_putc(sno);
+	serial_putc((uint8_t) ~(sno));
+
+	for (i = 0; i < PKTLEN_128; i++)
+  {
+		if (size_of_data || mode_of_transfer)
+    {
+			data = *tmppkt++;
+			size_of_data--;
+		}
+    else
+			data = 0x00;
+
+		serial_putc(data);
+
+		//chksm = (chksm<<8) ^ xcrc16tab[(chksm>>8)^data];
+		chksm = serial_add_crc(data, chksm);
+	}
+
+	/* An "endian independent way to extract the CRC bytes. */
+	serial_putc((uint8_t) (chksm >> 8));
+	serial_putc((uint8_t) chksm);
+
+	return (serial_getc()); /* Wait for ack */
+}
+
+//*----------------------------------------------------------------------------
+//* \brief Called when a transfer from target to host is being made (considered
+//*        an upload).
+//*----------------------------------------------------------------------------
+//Send given data (polling) using xmodem (if necessary)
+uint32_t serial_putdata_xmd(void const* data, uint32_t length)
+{
+	uint8_t c, sno = 1;
+	uint8_t done;
+	uint8_t * ptr_data = (uint8_t *) data;
+	error_timeout = 0;
+	if (!length)
+		mode_of_transfer = 1;
+	else
+  {
+		size_of_data = length;
+		mode_of_transfer = 0;
+	}
+
+	if (length & (PKTLEN_128 - 1))
+  {
+		length += PKTLEN_128;
+		length &= ~(PKTLEN_128 - 1);
+	}
+
+	/* Startup synchronization... */
+	/* Wait to receive a NAK or 'C' from receiver. */
+	done = 0;
+	while (!done) {
+		c = (uint8_t) serial_getc();
+		if (error_timeout)
+    { // Test for timeout in serial_getc
+			error_timeout = 0;
+			c = (uint8_t) serial_getc();
+			if (error_timeout)
+      {
+				error_timeout = 0;
+				return (0);
+			}
+		}
+		switch (c)
+    {
+      case NAK:
+        done = 1;
+        // ("CSM");
+			break;
+      case 'C':
+        done = 1;
+        // ("CRC");
+			break;
+      case 'q': /* ELS addition, not part of XMODEM spec. */
+        return (0);
+      default:
+			break;
+		}
+	}
+
+	done = 0;
+	sno = 1;
+	while (!done)
+  {
+		c = (uint8_t) putPacket((uint8_t *) ptr_data, sno);
+		if (error_timeout)
+    { // Test for timeout in serial_getc
+			error_timeout = 0;
+			return (0);
+		}
+		switch (c)
+    {
+      case ACK:
+        ++sno;
+        length -= PKTLEN_128;
+        ptr_data += PKTLEN_128;
+        // ("A");
+			break;
+
+      case NAK:
+        // ("N");
+			break;
+
+      case CAN:
+      case EOT:
+      default:
+        done = 0;
+			break;
+		}
+
+		if (!length)
+    {
+			serial_putc(EOT);
+			serial_getc(); /* Flush the ACK */
+			break;
+		}
+		// ("!");
+	}
+
+	mode_of_transfer = 0;
+	// ("Xup_done.");
+	return (1);
+	//    return(0);
+}
+
+/*----------------------------------------------------------------------------
+ * \brief Used by serial_getdata_xmd to retrieve packets.
+ */
+static uint8_t getPacket(uint8_t *ptr_data, uint8_t sno)
+{
+	uint8_t seq[2];
+	uint16_t crc, xcrc;
+
+	getbytes(seq, 2);
+	xcrc = getbytes(ptr_data, PKTLEN_128);
+	if (error_timeout)
+		return (false);
+
+	/* An "endian independent way to combine the CRC bytes. */
+	crc = (uint16_t) serial_getc() << 8;
+	crc += (uint16_t) serial_getc();
+
+	if (error_timeout == 1)
+		return (false);
+
+	if ((crc != xcrc) || (seq[0] != sno) || (seq[1] != (uint8_t) (~sno)))
+  {
+		serial_putc(CAN);
+		return (false);
+	}
+
+	serial_putc(ACK);
+	return (true);
+}
+
+//*----------------------------------------------------------------------------
+//* \brief Called when a transfer from host to target is being made (considered
+//*        an download).
+//*----------------------------------------------------------------------------
+//Get data from comm. device using xmodem (if necessary)
+uint32_t serial_getdata_xmd(void* data, uint32_t length)
+{
+	uint32_t timeout;
+	char c;
+	uint8_t * ptr_data = (uint8_t *) data;
+	uint32_t b_run, nbr_of_timeout = 100;
+	uint8_t sno = 0x01;
+	uint32_t data_transfered = 0;
+
+	//Copied from legacy source code ... might need some tweaking
+	uint32_t loops_per_second = CPU_FREQUENCY/60;
+
+	error_timeout = 0;
+
+	if (length == 0)
+		mode_of_transfer = 1;
+	else
+  {
+		size_of_data = length;
+		mode_of_transfer = 0;
+	}
+
+	/* Startup synchronization... */
+	/* Continuously send NAK or 'C' until sender responds. */
+	// ("Xdown");
+	while (1)
+  {
+		serial_putc('C');
+		timeout = loops_per_second;
+		while (!(serial_is_rx_ready()) && timeout)
+			timeout--;
+		if (timeout)
+			break;
+
+		if (!(--nbr_of_timeout))
+			return (0);
+//            return -1;
+	}
+
+	b_run = true;
+	// ("Got response");
+	while (b_run != false)
+  {
+		c = (char) serial_getc();
+		if (error_timeout)
+    { // Test for timeout in serial_getc
+			error_timeout = 0;
+			return (0);
+//            return (-1);
+		}
+		switch (c)
+    {
+      case SOH: /* 128-byte incoming packet */
+        // ("O");
+        b_run = getPacket(ptr_data, sno);
+        if (error_timeout)
+        { // Test for timeout in serial_getc
+          error_timeout = 0;
+          return (0);
+  //                return (-1);
+        }
+        if (b_run == true)
+        {
+          ++sno;
+          ptr_data += PKTLEN_128;
+          data_transfered += PKTLEN_128;
+        }
+			break;
+      case EOT: // ("E");
+        serial_putc(ACK);
+        b_run = false;
+			break;
+      case CAN: // ("C");
+      case ESC: /* "X" User-invoked abort */
+      default:
+        b_run = false;
+			break;
+		}
+		// ("!");
+	}
+	mode_of_transfer = 0;
+	return (true);
+//    return(b_run);
+}
+

bootloaders/metroM4/sam_ba_serial.h

@@ -0,0 +1,143 @@
+/*
+  Copyright (c) 2015 Arduino LLC.  All right reserved.
+  Copyright (c) 2015 Atmel Corporation/Thibaut VIARD.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#ifndef _SAM_BA_SERIAL_H_
+#define _SAM_BA_SERIAL_H_
+
+#include <stdint.h>
+#include <stdbool.h>
+
+
+/* USART buffer size (must be a power of two) */
+#define USART_BUFFER_SIZE        (128)
+
+/* Define the default time-out value for USART. */
+#define USART_DEFAULT_TIMEOUT    (1000)
+
+/* Xmodem related defines */
+/* CRC16  polynomial */
+#define CRC16POLY                (0x1021)
+
+#define SHARP_CHARACTER          '#'
+
+/* X/Ymodem protocol: */
+#define SOH                      (0x01)
+//#define STX                    (0x02)
+#define EOT                      (0x04)
+#define ACK                      (0x06)
+#define NAK                      (0x15)
+#define CAN                      (0x18)
+#define ESC                      (0x1b)
+
+#define PKTLEN_128               (128)
+
+
+/**
+ * \brief Open the given USART
+ */
+void serial_open(void);
+
+/**
+ * \brief Stops the USART
+ */
+void serial_close(void);
+
+/**
+ * \brief Puts a byte on usart line
+ *
+ * \param value      Value to put
+ *
+ * \return \c 1 if function was successfully done, otherwise \c 0.
+ */
+int serial_putc(int value);
+
+/**
+ * \brief Waits and gets a value on usart line
+ *
+ * \return value read on usart line
+ */
+int serial_getc(void);
+
+/**
+ * \brief Returns true if the SAM-BA Uart received the sharp char
+ *
+ * \return Returns true if the SAM-BA Uart received the sharp char
+ */
+int serial_sharp_received(void);
+
+/**
+ * \brief This function checks if a character has been received on the usart line
+ *
+ * \return \c 1 if a byte is ready to be read.
+ */
+bool serial_is_rx_ready(void);
+
+/**
+ * \brief Gets a value on usart line
+ *
+ * \return value read on usart line
+ */
+int serial_readc(void);
+
+/**
+ * \brief Send buffer on usart line
+ *
+ * \param data pointer
+ * \param number of data to send
+ * \return number of data sent
+ */
+uint32_t serial_putdata(void const* data, uint32_t length); //Send given data (polling)
+
+/**
+ * \brief Gets data from usart line
+ *
+ * \param data pointer
+ * \param number of data to get
+ * \return value read on usart line
+ */
+uint32_t serial_getdata(void* data, uint32_t length); //Get data from comm. device
+
+/**
+ * \brief Send buffer on usart line using Xmodem protocol
+ *
+ * \param data pointer
+ * \param number of data to send
+ * \return number of data sent
+ */
+uint32_t serial_putdata_xmd(void const* data, uint32_t length); //Send given data (polling) using xmodem (if necessary)
+
+/**
+ * \brief Gets data from usart line using Xmodem protocol
+ *
+ * \param data pointer
+ * \param number of data to get
+ * \return value read on usart line
+ */
+uint32_t serial_getdata_xmd(void* data, uint32_t length); //Get data from comm. device using xmodem (if necessary)
+
+/**
+ * \brief Compute the CRC
+ *
+ * \param Char to add to CRC
+ * \param Previous CRC
+ * \return The new computed CRC
+ */
+unsigned short serial_add_crc(char c, unsigned short crc);
+
+#endif // _SAM_BA_SERIAL_H_

bootloaders/metroM4/sam_ba_usb.c

@@ -0,0 +1,436 @@
+/*
+  Copyright (c) 2015 Arduino LLC.  All right reserved.
+  Copyright (c) 2015 Atmel Corporation/Thibaut VIARD.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#include <stdint.h>
+#include <string.h>
+#include "board_definitions.h"
+#include "sam_ba_usb.h"
+#include "board_driver_usb.h"
+#include "sam_ba_cdc.h"
+
+/* This data array will be copied into SRAM as its length is inferior to 64 bytes,
+ * and so can stay in flash.
+ */
+static __attribute__((__aligned__(4)))
+const char devDescriptor[] =
+{
+  /* Device descriptor */
+  0x12,   // bLength
+  0x01,   // bDescriptorType
+  0x00,   // bcdUSB L
+  0x02,   // bcdUSB H
+  0x02,   // bDeviceClass:    CDC class code
+  0x00,   // bDeviceSubclass: CDC class sub code
+  0x00,   // bDeviceProtocol: CDC Device protocol
+  0x40,   // bMaxPacketSize0
+  USB_VID_LOW,   // idVendor L
+  USB_VID_HIGH,   // idVendor H
+  USB_PID_LOW,   // idProduct L
+  USB_PID_HIGH,  // idProduct H
+  0x00,   // bcdDevice L, here matching SAM-BA version
+  0x02,   // bcdDevice H
+  STRING_INDEX_MANUFACTURER,   // iManufacturer
+  STRING_INDEX_PRODUCT,        // iProduct
+  0x00,   // SerialNumber, should be based on product unique ID
+  0x01    // bNumConfigs
+};
+
+/* This data array will be consumed directly by USB_Write() and must be in SRAM.
+ * We cannot send data from product internal flash.
+ */
+static __attribute__((__aligned__(4)))
+char cfgDescriptor[] =
+{
+  /* ============== CONFIGURATION 1 =========== */
+  /* Configuration 1 descriptor */
+  0x09,   // CbLength
+  0x02,   // CbDescriptorType
+  0x43,   // CwTotalLength 2 EP + Control
+  0x00,
+  0x02,   // CbNumInterfaces
+  0x01,   // CbConfigurationValue
+  0x00,   // CiConfiguration
+  0x80,   // CbmAttributes Bus powered without remote wakeup: 0x80, Self powered without remote wakeup: 0xc0
+  0x32,   // CMaxPower, report using 100mA, enough for a bootloader
+
+  /* Communication Class Interface Descriptor Requirement */
+  0x09, // bLength
+  0x04, // bDescriptorType
+  0x00, // bInterfaceNumber
+  0x00, // bAlternateSetting
+  0x01, // bNumEndpoints
+  0x02, // bInterfaceClass
+  0x02, // bInterfaceSubclass
+  0x00, // bInterfaceProtocol
+  0x00, // iInterface
+
+  /* Header Functional Descriptor */
+  0x05, // bFunction Length
+  0x24, // bDescriptor type: CS_INTERFACE
+  0x00, // bDescriptor subtype: Header Func Desc
+  0x10, // bcdCDC:1.1
+  0x01,
+
+  /* ACM Functional Descriptor */
+  0x04, // bFunctionLength
+  0x24, // bDescriptor Type: CS_INTERFACE
+  0x02, // bDescriptor Subtype: ACM Func Desc
+  0x00, // bmCapabilities
+
+  /* Union Functional Descriptor */
+  0x05, // bFunctionLength
+  0x24, // bDescriptorType: CS_INTERFACE
+  0x06, // bDescriptor Subtype: Union Func Desc
+  0x00, // bMasterInterface: Communication Class Interface
+  0x01, // bSlaveInterface0: Data Class Interface
+
+  /* Call Management Functional Descriptor */
+  0x05, // bFunctionLength
+  0x24, // bDescriptor Type: CS_INTERFACE
+  0x01, // bDescriptor Subtype: Call Management Func Desc
+  0x00, // bmCapabilities: D1 + D0
+  0x01, // bDataInterface: Data Class Interface 1
+
+  /* Endpoint 1 descriptor */
+  0x07,   // bLength
+  0x05,   // bDescriptorType
+  0x83,   // bEndpointAddress, Endpoint 03 - IN
+  0x03,   // bmAttributes      INT
+  0x08,   // wMaxPacketSize
+  0x00,
+  0xFF,   // bInterval
+
+  /* Data Class Interface Descriptor Requirement */
+  0x09, // bLength
+  0x04, // bDescriptorType
+  0x01, // bInterfaceNumber
+  0x00, // bAlternateSetting
+  0x02, // bNumEndpoints
+  0x0A, // bInterfaceClass
+  0x00, // bInterfaceSubclass
+  0x00, // bInterfaceProtocol
+  0x00, // iInterface
+
+  /* First alternate setting */
+  /* Endpoint 1 descriptor */
+  0x07,   // bLength
+  0x05,   // bDescriptorType
+  0x81,   // bEndpointAddress, Endpoint 01 - IN
+  0x02,   // bmAttributes      BULK
+  USB_EP_IN_SIZE,   // wMaxPacketSize
+  0x00,
+  0x00,   // bInterval
+
+  /* Endpoint 2 descriptor */
+  0x07,   // bLength
+  0x05,   // bDescriptorType
+  0x02,   // bEndpointAddress, Endpoint 02 - OUT
+  0x02,   // bmAttributes      BULK
+  USB_EP_OUT_SIZE,   // wMaxPacketSize
+  0x00,
+  0x00    // bInterval
+};
+
+#ifndef STRING_MANUFACTURER
+#  define STRING_MANUFACTURER "Arduino LLC"
+#endif
+
+#ifndef STRING_PRODUCT
+#  define STRING_PRODUCT "Arduino Zero"
+#endif
+
+USB_CDC sam_ba_cdc;
+
+/*----------------------------------------------------------------------------
+ * \brief This function is a callback invoked when a SETUP packet is received
+ */
+void sam_ba_usb_CDC_Enumerate(P_USB_CDC pCdc)
+{
+  Usb *pUsb = pCdc->pUsb;
+  static volatile uint8_t bmRequestType, bRequest, dir;
+  static volatile uint16_t wValue, wIndex, wLength, wStatus;
+
+  /* Clear the Received Setup flag */
+  pUsb->DEVICE.DeviceEndpoint[0].EPINTFLAG.reg = USB_DEVICE_EPINTFLAG_RXSTP;
+
+  /* Read the USB request parameters */
+  bmRequestType = udd_ep_out_cache_buffer[0][0];
+  bRequest      = udd_ep_out_cache_buffer[0][1];
+  wValue        = (udd_ep_out_cache_buffer[0][2] & 0xFF);
+  wValue       |= (udd_ep_out_cache_buffer[0][3] << 8);
+  wIndex        = (udd_ep_out_cache_buffer[0][4] & 0xFF);
+  wIndex       |= (udd_ep_out_cache_buffer[0][5] << 8);
+  wLength       = (udd_ep_out_cache_buffer[0][6] & 0xFF);
+  wLength      |= (udd_ep_out_cache_buffer[0][7] << 8);
+
+  /* Clear the Bank 0 ready flag on Control OUT */
+  pUsb->DEVICE.DeviceEndpoint[0].EPSTATUSCLR.reg = USB_DEVICE_EPSTATUSCLR_BK0RDY;
+
+  /* Handle supported standard device request Cf Table 9-3 in USB specification Rev 1.1 */
+  switch ((bRequest << 8) | bmRequestType)
+  {
+    case STD_GET_DESCRIPTOR:
+      if (wValue>>8 == STD_GET_DESCRIPTOR_DEVICE)
+      {
+        /* Return Device Descriptor */
+        USB_Write(pCdc->pUsb, devDescriptor, SAM_BA_MIN(sizeof(devDescriptor), wLength), USB_EP_CTRL);
+      }
+      else if (wValue>>8 == STD_GET_DESCRIPTOR_CONFIGURATION)
+      {
+        /* Return Configuration Descriptor */
+        USB_Write(pCdc->pUsb, cfgDescriptor, SAM_BA_MIN(sizeof(cfgDescriptor), wLength), USB_EP_CTRL);
+      }
+      else if (wValue>>8 == STD_GET_DESCRIPTOR_STRING)
+      {
+        switch ( wValue & 0xff )
+        {
+          case STRING_INDEX_LANGUAGES: {
+            uint16_t STRING_LANGUAGE[2] = { (STD_GET_DESCRIPTOR_STRING<<8) | 4, 0x0409 };
+
+            USB_Write(pCdc->pUsb, (const char*)STRING_LANGUAGE, SAM_BA_MIN(sizeof(STRING_LANGUAGE), wLength), USB_EP_CTRL);
+          }
+          break;
+
+          case STRING_INDEX_MANUFACTURER:
+            USB_SendString(pCdc->pUsb, STRING_MANUFACTURER, wLength );
+          break;
+
+          case STRING_INDEX_PRODUCT:
+            USB_SendString(pCdc->pUsb, STRING_PRODUCT, wLength );
+          break;
+          default:
+            /* Stall the request */
+            USB_SendStall(pUsb, true);
+          break;
+        }
+      }
+      else
+      {
+        /* Stall the request */
+        USB_SendStall(pUsb, true);
+      }
+    break;
+
+    case STD_SET_ADDRESS:
+      /* Send ZLP */
+      USB_SendZlp(pUsb);
+      /* Set device address to the newly received address from host */
+      USB_SetAddress(pCdc->pUsb, wValue);
+    break;
+
+    case STD_SET_CONFIGURATION:
+      /* Store configuration */
+      pCdc->currentConfiguration = (uint8_t)wValue;
+
+      /* Send ZLP */
+      USB_SendZlp(pUsb);
+
+      /* Configure the 3 needed endpoints */
+      USB_Configure(pUsb);
+    break;
+
+    case STD_GET_CONFIGURATION:
+      /* Return current configuration value */
+      USB_Write(pCdc->pUsb, (char *) &(pCdc->currentConfiguration), sizeof(pCdc->currentConfiguration), USB_EP_CTRL);
+    break;
+
+    case STD_GET_STATUS_ZERO:
+      wStatus = 0;
+      USB_Write(pCdc->pUsb, (char *) &wStatus, sizeof(wStatus), USB_EP_CTRL);
+    break;
+
+    case STD_GET_STATUS_INTERFACE:
+      wStatus = 0;
+      USB_Write(pCdc->pUsb, (char *) &wStatus, sizeof(wStatus), USB_EP_CTRL);
+    break;
+
+    case STD_GET_STATUS_ENDPOINT:
+      wStatus = 0;
+      dir = wIndex & 80;
+      wIndex &= 0x0F;
+      if (wIndex <= 3)
+      {
+        if (dir)
+        {
+          wStatus = (pUsb->DEVICE.DeviceEndpoint[wIndex].EPSTATUS.reg & USB_DEVICE_EPSTATUSSET_STALLRQ1) ? 1 : 0;
+        }
+        else
+        {
+          wStatus = (pUsb->DEVICE.DeviceEndpoint[wIndex].EPSTATUS.reg & USB_DEVICE_EPSTATUSSET_STALLRQ0) ? 1 : 0;
+        }
+        /* Return current status of endpoint */
+        USB_Write(pCdc->pUsb, (char *) &wStatus, sizeof(wStatus), USB_EP_CTRL);
+      }
+      else
+      {
+        /* Stall the request */
+        USB_SendStall(pUsb, true);
+      }
+    break;
+
+    case STD_SET_FEATURE_ZERO:
+      /* Stall the request */
+      USB_SendStall(pUsb, true);
+    break;
+
+    case STD_SET_FEATURE_INTERFACE:
+      /* Send ZLP */
+      USB_SendZlp(pUsb);
+    break;
+
+    case STD_SET_FEATURE_ENDPOINT:
+      dir = wIndex & 0x80;
+      wIndex &= 0x0F;
+      if ((wValue == 0) && wIndex && (wIndex <= 3))
+      {
+        /* Set STALL request for the endpoint */
+        if (dir)
+        {
+          pUsb->DEVICE.DeviceEndpoint[wIndex].EPSTATUSSET.reg = USB_DEVICE_EPSTATUSSET_STALLRQ1;
+        }
+        else
+        {
+          pUsb->DEVICE.DeviceEndpoint[wIndex].EPSTATUSSET.reg = USB_DEVICE_EPSTATUSSET_STALLRQ0;
+        }
+
+        /* Send ZLP */
+        USB_SendZlp(pUsb);
+      }
+      else
+      {
+        /* Stall the request */
+        USB_SendStall(pUsb, true);
+      }
+    break;
+
+    case STD_SET_INTERFACE:
+    case STD_CLEAR_FEATURE_ZERO:
+      /* Stall the request */
+      USB_SendStall(pUsb, true);
+    break;
+
+    case STD_CLEAR_FEATURE_INTERFACE:
+      /* Send ZLP */
+      USB_SendZlp(pUsb);
+    break;
+
+    case STD_CLEAR_FEATURE_ENDPOINT:
+      dir = wIndex & 0x80;
+      wIndex &= 0x0F;
+
+      if ((wValue == 0) && wIndex && (wIndex <= 3))
+      {
+        if (dir)
+        {
+          if (pUsb->DEVICE.DeviceEndpoint[wIndex].EPSTATUS.bit.STALLRQ1)
+          {
+            // Remove stall request
+            pUsb->DEVICE.DeviceEndpoint[wIndex].EPSTATUSCLR.reg = USB_DEVICE_EPSTATUSCLR_STALLRQ1;
+            if (pUsb->DEVICE.DeviceEndpoint[wIndex].EPINTFLAG.bit.STALL1)
+            {
+              pUsb->DEVICE.DeviceEndpoint[wIndex].EPINTFLAG.reg = USB_DEVICE_EPINTFLAG_STALL1;
+              // The Stall has occurred, then reset data toggle
+              pUsb->DEVICE.DeviceEndpoint[wIndex].EPSTATUSCLR.reg = USB_DEVICE_EPSTATUSSET_DTGLIN;
+            }
+          }
+        }
+        else
+        {
+          if (pUsb->DEVICE.DeviceEndpoint[wIndex].EPSTATUS.bit.STALLRQ0)
+          {
+            // Remove stall request
+            pUsb->DEVICE.DeviceEndpoint[wIndex].EPSTATUSCLR.reg = USB_DEVICE_EPSTATUSCLR_STALLRQ0;
+            if (pUsb->DEVICE.DeviceEndpoint[wIndex].EPINTFLAG.bit.STALL0)
+            {
+              pUsb->DEVICE.DeviceEndpoint[wIndex].EPINTFLAG.reg = USB_DEVICE_EPINTFLAG_STALL0;
+              // The Stall has occurred, then reset data toggle
+              pUsb->DEVICE.DeviceEndpoint[wIndex].EPSTATUSCLR.reg = USB_DEVICE_EPSTATUSSET_DTGLOUT;
+            }
+          }
+        }
+        /* Send ZLP */
+        USB_SendZlp(pUsb);
+      }
+      else
+      {
+        USB_SendStall(pUsb, true);
+      }
+    break;
+
+    // handle CDC class requests
+    case SET_LINE_CODING:
+      /* Send ZLP */
+      USB_SendZlp(pUsb);
+    break;
+
+    case GET_LINE_CODING:
+      /* Send current line coding */
+      USB_Write(pCdc->pUsb, (char *) &line_coding, SAM_BA_MIN(sizeof(usb_cdc_line_coding_t), wLength), USB_EP_CTRL);
+    break;
+
+    case SET_CONTROL_LINE_STATE:
+      /* Store the current connection */
+      pCdc->currentConnection = wValue;
+      /* Send ZLP */
+      USB_SendZlp(pUsb);
+    break;
+
+    default:
+      /* Stall the request */
+      USB_SendStall(pUsb, true);
+    break;
+  }
+}
+
+/*----------------------------------------------------------------------------
+ * \brief
+ */
+P_USB_CDC usb_init(void)
+{
+  sam_ba_cdc.pUsb = USB;
+
+  /* Initialize USB */
+  USB_Init();
+  /* Get the default CDC structure settings */
+  USB_Open(&sam_ba_cdc, sam_ba_cdc.pUsb);
+
+  return &sam_ba_cdc;
+}
+
+/*----------------------------------------------------------------------------
+ * \brief Send a USB descriptor string.
+ *
+ * The input string is plain ASCII but is sent out as UTF-16 with the correct 2-byte prefix.
+ */
+uint32_t USB_SendString(Usb *pUsb, const char* ascii_string, uint8_t maxLength)
+{
+  uint8_t string_descriptor[255]; // Max USB-allowed string length
+  uint16_t* unicode_string=(uint16_t*)(string_descriptor+2); // point on 3 bytes of descriptor
+  int resulting_length;
+
+  string_descriptor[0] = (strlen(ascii_string)<<1) + 2;
+  string_descriptor[1] = STD_GET_DESCRIPTOR_STRING;
+
+  for ( resulting_length = 1 ; *ascii_string && (resulting_length<maxLength>>1) ; resulting_length++ )
+  {
+    *unicode_string++ = (uint16_t)(*ascii_string++);
+  }
+
+  return USB_Write(pUsb, (const char*)string_descriptor, resulting_length<<1, USB_EP_CTRL);
+}

bootloaders/metroM4/sam_ba_usb.h

@@ -0,0 +1,103 @@
+/*
+  Copyright (c) 2015 Arduino LLC.  All right reserved.
+  Copyright (c) 2015 Atmel Corporation/Thibaut VIARD.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#ifndef CDC_ENUMERATE_H
+#define CDC_ENUMERATE_H
+
+#include <sam.h>
+#include <stdbool.h>
+
+#define USB_EP_CTRL             (0u)
+#define USB_EP_OUT              (2u)
+#define USB_EP_OUT_SIZE         (0x40u)
+#define USB_EP_IN               (1u)
+#define USB_EP_IN_SIZE          (0x40u)
+#define USB_EP_COMM             (3u)
+#define MAX_EP                  (4u)
+
+/* USB standard request code */
+#define STD_GET_STATUS_ZERO            (0x0080u)
+#define STD_GET_STATUS_INTERFACE       (0x0081u)
+#define STD_GET_STATUS_ENDPOINT        (0x0082u)
+
+#define STD_CLEAR_FEATURE_ZERO         (0x0100u)
+#define STD_CLEAR_FEATURE_INTERFACE    (0x0101u)
+#define STD_CLEAR_FEATURE_ENDPOINT     (0x0102u)
+
+#define STD_SET_FEATURE_ZERO           (0x0300u)
+#define STD_SET_FEATURE_INTERFACE      (0x0301u)
+#define STD_SET_FEATURE_ENDPOINT       (0x0302u)
+
+#define STD_SET_ADDRESS                (0x0500u)
+#define STD_GET_DESCRIPTOR             (0x0680u)
+#define STD_SET_DESCRIPTOR             (0x0700u)
+#define STD_GET_CONFIGURATION          (0x0880u)
+#define STD_SET_CONFIGURATION          (0x0900u)
+#define STD_GET_INTERFACE              (0x0A81u)
+#define STD_SET_INTERFACE              (0x0B01u)
+#define STD_SYNCH_FRAME                (0x0C82u)
+
+#define STD_GET_DESCRIPTOR_DEVICE                          (1u)
+#define STD_GET_DESCRIPTOR_CONFIGURATION                   (2u)
+#define STD_GET_DESCRIPTOR_STRING                          (3u)
+#define STD_GET_DESCRIPTOR_INTERFACE                       (4u)
+#define STD_GET_DESCRIPTOR_ENDPOINT                        (5u)
+#define STD_GET_DESCRIPTOR_DEVICE_QUALIFIER                (6u)
+#define STD_GET_DESCRIPTOR_OTHER_SPEED_CONFIGURATION       (7u)
+#define STD_GET_DESCRIPTOR_INTERFACE_POWER1                (8u)
+
+#define FEATURE_ENDPOINT_HALT          (0u)
+#define FEATURE_DEVICE_REMOTE_WAKEUP   (1u)
+#define FEATURE_TEST_MODE              (2u)
+
+#define STRING_INDEX_LANGUAGES         (0x00u)
+#define STRING_INDEX_MANUFACTURER      (0x01u)
+#define STRING_INDEX_PRODUCT           (0x02u)
+
+#define SAM_BA_MIN(a, b) (((a) < (b)) ? (a) : (b))
+
+
+typedef struct _USB_CDC
+{
+	// Private members
+	Usb *pUsb;
+	uint8_t currentConfiguration;
+	uint8_t currentConnection;
+	// Public Methods:
+	uint8_t (*IsConfigured)(struct _USB_CDC *pCdc);
+//	uint32_t (*Write) (Usb *pUsb, const char *pData, uint32_t length, uint8_t ep_num);
+//	uint32_t (*Read)  (Usb *pUsb, char *pData, uint32_t length);
+} USB_CDC, *P_USB_CDC;
+
+/**
+ * \brief Initializes the USB module
+ *
+ * \return Pointer to the USB CDC structure
+ */
+P_USB_CDC usb_init(void);
+
+void sam_ba_usb_CDC_Enumerate(P_USB_CDC pCdc);
+
+uint32_t USB_SendString(Usb *pUsb, const char* ascii_string, uint8_t maxLength);
+
+extern USB_CDC sam_ba_cdc;
+
+
+
+#endif // CDC_ENUMERATE_H

bootloaders/metroM4/samd51_sam_ba.componentinfo.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Store xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="AtmelPackComponentManagement">
+	<ProjectComponents />
+</Store>

bootloaders/metroM4/samd51_sam_ba.cproj

@@ -0,0 +1,300 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="14.0">
+  <PropertyGroup>
+    <SchemaVersion>2.0</SchemaVersion>
+    <ProjectVersion>7.0</ProjectVersion>
+    <ToolchainName>com.Atmel.ARMGCC.C</ToolchainName>
+    <ProjectGuid>dce6c7e3-ee26-4d79-826b-08594b9ad897</ProjectGuid>
+    <avrdevice>ATSAMD51J19A</avrdevice>
+    <avrdeviceseries>none</avrdeviceseries>
+    <OutputType>Executable</OutputType>
+    <Language>C</Language>
+    <OutputFileName>$(MSBuildProjectName)</OutputFileName>
+    <OutputFileExtension>.elf</OutputFileExtension>
+    <OutputDirectory>$(MSBuildProjectDirectory)\$(Configuration)</OutputDirectory>
+    <AssemblyName>samd21_sam_ba</AssemblyName>
+    <Name>samd51_sam_ba</Name>
+    <RootNamespace>samd21_sam_ba</RootNamespace>
+    <ToolchainFlavour>Native</ToolchainFlavour>
+    <KeepTimersRunning>true</KeepTimersRunning>
+    <OverrideVtor>false</OverrideVtor>
+    <CacheFlash>true</CacheFlash>
+    <ProgFlashFromRam>true</ProgFlashFromRam>
+    <RamSnippetAddress>0x20000000</RamSnippetAddress>
+    <UncachedRange />
+    <preserveEEPROM>true</preserveEEPROM>
+    <OverrideVtorValue>exception_table</OverrideVtorValue>
+    <BootSegment>2</BootSegment>
+    <eraseonlaunchrule>0</eraseonlaunchrule>
+    <ExternalProgrammingToolCommand />
+    <AsfFrameworkConfig>
+      <framework-data xmlns="">
+        <options />
+        <configurations />
+        <files />
+        <documentation help="" />
+        <offline-documentation help="" />
+        <dependencies>
+          <content-extension eid="atmel.asf" uuidref="Atmel.ASF" version="3.27.3" />
+        </dependencies>
+      </framework-data>
+    </AsfFrameworkConfig>
+    <avrtool>com.atmel.avrdbg.tool.edbg</avrtool>
+    <avrtoolserialnumber>00000000EZE000006352</avrtoolserialnumber>
+    <avrdeviceexpectedsignature>0x60060005</avrdeviceexpectedsignature>
+    <avrtoolinterface>SWD</avrtoolinterface>
+    <com_atmel_avrdbg_tool_atmelice>
+      <ToolOptions>
+        <InterfaceProperties>
+          <SwdClock>0</SwdClock>
+        </InterfaceProperties>
+        <InterfaceName>SWD</InterfaceName>
+      </ToolOptions>
+      <ToolType>com.atmel.avrdbg.tool.atmelice</ToolType>
+      <ToolNumber>J41800001895</ToolNumber>
+      <ToolName>Atmel-ICE</ToolName>
+    </com_atmel_avrdbg_tool_atmelice>
+    <avrtoolinterfaceclock>2000000</avrtoolinterfaceclock>
+    <com_atmel_avrdbg_tool_edbg>
+      <ToolOptions>
+        <InterfaceProperties>
+          <SwdClock>2000000</SwdClock>
+        </InterfaceProperties>
+        <InterfaceName>SWD</InterfaceName>
+      </ToolOptions>
+      <ToolType>com.atmel.avrdbg.tool.edbg</ToolType>
+      <ToolNumber>00000000EZE000006352</ToolNumber>
+      <ToolName>EDBG</ToolName>
+    </com_atmel_avrdbg_tool_edbg>
+    <UseGdb>True</UseGdb>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)' == 'Release' ">
+    <ToolchainSettings>
+      <ArmGcc>
+  <armgcc.common.outputfiles.hex>True</armgcc.common.outputfiles.hex>
+  <armgcc.common.outputfiles.lss>True</armgcc.common.outputfiles.lss>
+  <armgcc.common.outputfiles.eep>True</armgcc.common.outputfiles.eep>
+  <armgcc.common.outputfiles.bin>True</armgcc.common.outputfiles.bin>
+  <armgcc.common.outputfiles.srec>True</armgcc.common.outputfiles.srec>
+  <armgcc.compiler.symbols.DefSymbols>
+    <ListValues>
+      <Value>NDEBUG</Value>
+    </ListValues>
+  </armgcc.compiler.symbols.DefSymbols>
+  <armgcc.compiler.optimization.level>Optimize for size (-Os)</armgcc.compiler.optimization.level>
+  <armgcc.compiler.optimization.PrepareFunctionsForGarbageCollection>True</armgcc.compiler.optimization.PrepareFunctionsForGarbageCollection>
+  <armgcc.compiler.warnings.AllWarnings>True</armgcc.compiler.warnings.AllWarnings>
+  <armgcc.linker.libraries.Libraries>
+    <ListValues>
+      <Value>libm</Value>
+    </ListValues>
+  </armgcc.linker.libraries.Libraries>
+  <armgcc.linker.optimization.GarbageCollectUnusedSections>True</armgcc.linker.optimization.GarbageCollectUnusedSections>
+  <armgcc.linker.miscellaneous.LinkerFlags>-Tsamd21j18a_flash.ld</armgcc.linker.miscellaneous.LinkerFlags>
+</ArmGcc>
+    </ToolchainSettings>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)' == 'Debug' ">
+    <ToolchainSettings>
+      <ArmGcc>
+  <armgcc.common.outputfiles.hex>True</armgcc.common.outputfiles.hex>
+  <armgcc.common.outputfiles.lss>True</armgcc.common.outputfiles.lss>
+  <armgcc.common.outputfiles.eep>True</armgcc.common.outputfiles.eep>
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+  <armgcc.compiler.symbols.DefSymbols>
+    <ListValues>
+      <Value>DEBUG</Value>
+    </ListValues>
+  </armgcc.compiler.symbols.DefSymbols>
+  <armgcc.compiler.optimization.level>Optimize (-O1)</armgcc.compiler.optimization.level>
+  <armgcc.compiler.optimization.PrepareFunctionsForGarbageCollection>True</armgcc.compiler.optimization.PrepareFunctionsForGarbageCollection>
+  <armgcc.compiler.optimization.DebugLevel>Maximum (-g3)</armgcc.compiler.optimization.DebugLevel>
+  <armgcc.compiler.warnings.AllWarnings>True</armgcc.compiler.warnings.AllWarnings>
+  <armgcc.linker.libraries.Libraries>
+    <ListValues>
+      <Value>libm</Value>
+    </ListValues>
+  </armgcc.linker.libraries.Libraries>
+  <armgcc.linker.optimization.GarbageCollectUnusedSections>True</armgcc.linker.optimization.GarbageCollectUnusedSections>
+  <armgcc.linker.miscellaneous.LinkerFlags>-Tsamd21j18a_flash.ld</armgcc.linker.miscellaneous.LinkerFlags>
+  <armgcc.assembler.debugging.DebugLevel>Default (-g)</armgcc.assembler.debugging.DebugLevel>
+  <armgcc.preprocessingassembler.debugging.DebugLevel>Default (-Wa,-g)</armgcc.preprocessingassembler.debugging.DebugLevel>
+</ArmGcc>
+    </ToolchainSettings>
+    <UsesExternalMakeFile>True</UsesExternalMakeFile>
+    <OutputDirectory />
+    <BuildTarget>DEBUG=1 all</BuildTarget>
+    <CleanTarget>clean</CleanTarget>
+    <ExternalMakeFilePath>Makefile</ExternalMakeFilePath>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)' == 'featherm4' ">
+    <ToolchainSettings>
+      <ArmGcc>
+  <armgcc.common.outputfiles.hex>True</armgcc.common.outputfiles.hex>
+  <armgcc.common.outputfiles.lss>True</armgcc.common.outputfiles.lss>
+  <armgcc.common.outputfiles.eep>True</armgcc.common.outputfiles.eep>
+  <armgcc.common.outputfiles.bin>True</armgcc.common.outputfiles.bin>
+  <armgcc.common.outputfiles.srec>True</armgcc.common.outputfiles.srec>
+  <armgcc.compiler.symbols.DefSymbols>
+    <ListValues>
+      <Value>DEBUG</Value>
+    </ListValues>
+  </armgcc.compiler.symbols.DefSymbols>
+  <armgcc.compiler.optimization.level>Optimize (-O1)</armgcc.compiler.optimization.level>
+  <armgcc.compiler.optimization.PrepareFunctionsForGarbageCollection>True</armgcc.compiler.optimization.PrepareFunctionsForGarbageCollection>
+  <armgcc.compiler.optimization.DebugLevel>Maximum (-g3)</armgcc.compiler.optimization.DebugLevel>
+  <armgcc.compiler.warnings.AllWarnings>True</armgcc.compiler.warnings.AllWarnings>
+  <armgcc.linker.libraries.Libraries>
+    <ListValues>
+      <Value>libm</Value>
+    </ListValues>
+  </armgcc.linker.libraries.Libraries>
+  <armgcc.linker.optimization.GarbageCollectUnusedSections>True</armgcc.linker.optimization.GarbageCollectUnusedSections>
+  <armgcc.linker.miscellaneous.LinkerFlags>-Tsamd21j18a_flash.ld</armgcc.linker.miscellaneous.LinkerFlags>
+  <armgcc.assembler.debugging.DebugLevel>Default (-g)</armgcc.assembler.debugging.DebugLevel>
+  <armgcc.preprocessingassembler.debugging.DebugLevel>Default (-Wa,-g)</armgcc.preprocessingassembler.debugging.DebugLevel>
+</ArmGcc>
+    </ToolchainSettings>
+    <UsesExternalMakeFile>True</UsesExternalMakeFile>
+    <OutputDirectory />
+    <BuildTarget>DEBUG=1 all BOARD_ID=FEATHER_M4 BOARD_CHIP=__SAMD51G19A__</BuildTarget>
+    <CleanTarget>clean BOARD_ID=FEATHER_M4</CleanTarget>
+    <ExternalMakeFilePath>Makefile</ExternalMakeFilePath>
+    <OutputPath>bin\featherm4\</OutputPath>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)' == 'metrom4' ">
+    <ToolchainSettings>
+      <ArmGcc>
+  <armgcc.common.outputfiles.hex>True</armgcc.common.outputfiles.hex>
+  <armgcc.common.outputfiles.lss>True</armgcc.common.outputfiles.lss>
+  <armgcc.common.outputfiles.eep>True</armgcc.common.outputfiles.eep>
+  <armgcc.common.outputfiles.bin>True</armgcc.common.outputfiles.bin>
+  <armgcc.common.outputfiles.srec>True</armgcc.common.outputfiles.srec>
+  <armgcc.compiler.symbols.DefSymbols>
+    <ListValues>
+      <Value>DEBUG</Value>
+    </ListValues>
+  </armgcc.compiler.symbols.DefSymbols>
+  <armgcc.compiler.optimization.level>Optimize (-O1)</armgcc.compiler.optimization.level>
+  <armgcc.compiler.optimization.PrepareFunctionsForGarbageCollection>True</armgcc.compiler.optimization.PrepareFunctionsForGarbageCollection>
+  <armgcc.compiler.optimization.DebugLevel>Maximum (-g3)</armgcc.compiler.optimization.DebugLevel>
+  <armgcc.compiler.warnings.AllWarnings>True</armgcc.compiler.warnings.AllWarnings>
+  <armgcc.linker.libraries.Libraries>
+    <ListValues>
+      <Value>libm</Value>
+    </ListValues>
+  </armgcc.linker.libraries.Libraries>
+  <armgcc.linker.optimization.GarbageCollectUnusedSections>True</armgcc.linker.optimization.GarbageCollectUnusedSections>
+  <armgcc.linker.miscellaneous.LinkerFlags>-Tsamd21j18a_flash.ld</armgcc.linker.miscellaneous.LinkerFlags>
+  <armgcc.assembler.debugging.DebugLevel>Default (-g)</armgcc.assembler.debugging.DebugLevel>
+  <armgcc.preprocessingassembler.debugging.DebugLevel>Default (-Wa,-g)</armgcc.preprocessingassembler.debugging.DebugLevel>
+</ArmGcc>
+    </ToolchainSettings>
+    <UsesExternalMakeFile>True</UsesExternalMakeFile>
+    <OutputDirectory />
+    <BuildTarget>DEBUG=0 all BOARD_ID=METRO_M4 BOARD_CHIP=__SAMD51J19A__</BuildTarget>
+    <CleanTarget>clean BOARD_ID=METRO_M4</CleanTarget>
+    <ExternalMakeFilePath>Makefile</ExternalMakeFilePath>
+    <OutputPath>bin\metrom4\</OutputPath>
+    <OutputFileName>METRO_M4_sam_ba</OutputFileName>
+    <OutputFileExtension>.elf</OutputFileExtension>
+  </PropertyGroup>
+  <ItemGroup>
+    <Compile Include="board_definitions.h">
+      <SubType>compile</SubType>
+      <Link>board_definitions.h</Link>
+    </Compile>
+    <Compile Include="board_definitions_feather_m4.h">
+      <SubType>compile</SubType>
+    </Compile>
+    <Compile Include="board_definitions_metro_m4.h">
+      <SubType>compile</SubType>
+    </Compile>
+    <Compile Include="board_driver_led.c">
+      <SubType>compile</SubType>
+      <Link>board_driver_led.c</Link>
+    </Compile>
+    <Compile Include="board_driver_led.h">
+      <SubType>compile</SubType>
+      <Link>board_driver_led.h</Link>
+    </Compile>
+    <Compile Include="board_driver_serial.c">
+      <SubType>compile</SubType>
+      <Link>board_driver_serial.c</Link>
+    </Compile>
+    <Compile Include="board_driver_serial.h">
+      <SubType>compile</SubType>
+      <Link>board_driver_serial.h</Link>
+    </Compile>
+    <Compile Include="board_driver_usb.c">
+      <SubType>compile</SubType>
+      <Link>board_driver_usb.c</Link>
+    </Compile>
+    <Compile Include="board_driver_usb.h">
+      <SubType>compile</SubType>
+      <Link>board_driver_usb.h</Link>
+    </Compile>
+    <Compile Include="board_init.c">
+      <SubType>compile</SubType>
+      <Link>board_init.c</Link>
+    </Compile>
+    <Compile Include="board_startup.c">
+      <SubType>compile</SubType>
+      <Link>board_startup.c</Link>
+    </Compile>
+    <Compile Include="main.c">
+      <SubType>compile</SubType>
+      <Link>main.c</Link>
+    </Compile>
+    <Compile Include="sam_ba_cdc.c">
+      <SubType>compile</SubType>
+      <Link>sam_ba_cdc.c</Link>
+    </Compile>
+    <Compile Include="sam_ba_cdc.h">
+      <SubType>compile</SubType>
+      <Link>sam_ba_cdc.h</Link>
+    </Compile>
+    <Compile Include="sam_ba_monitor.c">
+      <SubType>compile</SubType>
+      <Link>sam_ba_monitor.c</Link>
+    </Compile>
+    <Compile Include="sam_ba_monitor.h">
+      <SubType>compile</SubType>
+      <Link>sam_ba_monitor.h</Link>
+    </Compile>
+    <Compile Include="sam_ba_serial.c">
+      <SubType>compile</SubType>
+      <Link>sam_ba_serial.c</Link>
+    </Compile>
+    <Compile Include="sam_ba_serial.h">
+      <SubType>compile</SubType>
+      <Link>sam_ba_serial.h</Link>
+    </Compile>
+    <Compile Include="sam_ba_usb.c">
+      <SubType>compile</SubType>
+      <Link>sam_ba_usb.c</Link>
+    </Compile>
+    <Compile Include="sam_ba_usb.h">
+      <SubType>compile</SubType>
+      <Link>sam_ba_usb.h</Link>
+    </Compile>
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="bootloader_FEATHER_M4.ld">
+      <SubType>compile</SubType>
+    </None>
+    <None Include="bootloader_METRO_M4.ld">
+      <SubType>compile</SubType>
+    </None>
+    <None Include="Makefile">
+      <SubType>compile</SubType>
+      <Link>Makefile</Link>
+    </None>
+    <None Include="README.md">
+      <SubType>compile</SubType>
+      <Link>README.md</Link>
+    </None>
+  </ItemGroup>
+  <Import Project="$(AVRSTUDIO_EXE_PATH)\\Vs\\Compiler.targets" />
+</Project>

bootloaders/metroM4/samdx1_sam_ba.atsln

@@ -0,0 +1,22 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Atmel Studio Solution File, Format Version 11.00
+VisualStudioVersion = 14.0.23107.0
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{54F91283-7BC4-4236-8FF9-10F437C3AD48}") = "samd51_sam_ba", "samd51_sam_ba.cproj", "{DCE6C7E3-EE26-4D79-826B-08594B9AD897}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|ARM = Debug|ARM
+		Release|ARM = Release|ARM
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{DCE6C7E3-EE26-4D79-826B-08594B9AD897}.Debug|ARM.ActiveCfg = metrom4|ARM
+		{DCE6C7E3-EE26-4D79-826B-08594B9AD897}.Debug|ARM.Build.0 = metrom4|ARM
+		{DCE6C7E3-EE26-4D79-826B-08594B9AD897}.Release|ARM.ActiveCfg = Release|ARM
+		{DCE6C7E3-EE26-4D79-826B-08594B9AD897}.Release|ARM.Build.0 = Release|ARM
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal

bootloaders/mkrfox1200/samd21_sam_ba_arduino_mkrfox1200.hex

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+:101E50007676154634564CD96DC90EF92FE9C899D6
+:101E6000E9898AB9ABA94458654806782768C0183B
+:101E7000E1088238A3287DCB5CDB3FEB1EFBF98BAE
+:101E8000D89BBBAB9ABB754A545A376A167AF10A8B
+:101E9000D01AB32A923A2EFD0FED6CDD4DCDAABDBE
+:101EA0008BADE89DC98D267C076C645C454CA23CDB
+:101EB000832CE01CC10C1FEF3EFF5DCF7CDF9BAF8E
+:101EC000BABFD98FF89F176E367E554E745E932E2B
+:0C1ED000B23ED10EF01E00000000000029
+:101EDC0001140000090243000201008032090400D1
+:101EEC000001020200000524001001042402000578
+:101EFC00240600010524010001070583030800FFE7
+:101F0C0009040100020A00000007058102400000DC
+:101F1C00070502024000000000C20100000008009A
+:0C1F2C00690000004100000000000000FF
+:0400000300000B816D
+:00000001FF

bootloaders/mzero/Bootloader_D21/src/ASF/sam0/utils/cmsis/samd21/include/samd21e15a.h

@@ -218,7 +218,11 @@ void I2S_Handler                 ( void );
  * \brief Configuration of the Cortex-M0+ Processor and Core Peripherals
  */
 
-#define LITTLE_ENDIAN          1        
+#if defined(LITTLE_ENDIAN) && (LITTLE_ENDIAN != 1)
+  #error "Little Endian is already defined, but to different value than expected?!"
+#else
+  #define LITTLE_ENDIAN          1
+#endif
 #define __CM0PLUS_REV          1         /*!< Core revision r0p1 */
 #define __MPU_PRESENT          0         /*!< MPU present or not */
 #define __NVIC_PRIO_BITS       2         /*!< Number of bits used for Priority Levels */

bootloaders/mzero/Bootloader_D21/src/ASF/sam0/utils/cmsis/samd21/include/samd21e16a.h

@@ -218,7 +218,11 @@ void I2S_Handler                 ( void );
  * \brief Configuration of the Cortex-M0+ Processor and Core Peripherals
  */
 
-#define LITTLE_ENDIAN          1        
+#if defined(LITTLE_ENDIAN) && (LITTLE_ENDIAN != 1)
+  #error "Little Endian is already defined, but to different value than expected?!"
+#else
+  #define LITTLE_ENDIAN          1
+#endif
 #define __CM0PLUS_REV          1         /*!< Core revision r0p1 */
 #define __MPU_PRESENT          0         /*!< MPU present or not */
 #define __NVIC_PRIO_BITS       2         /*!< Number of bits used for Priority Levels */

bootloaders/mzero/Bootloader_D21/src/ASF/sam0/utils/cmsis/samd21/include/samd21e17a.h

@@ -218,7 +218,11 @@ void I2S_Handler                 ( void );
  * \brief Configuration of the Cortex-M0+ Processor and Core Peripherals
  */
 
-#define LITTLE_ENDIAN          1        
+#if defined(LITTLE_ENDIAN) && (LITTLE_ENDIAN != 1)
+  #error "Little Endian is already defined, but to different value than expected?!"
+#else
+  #define LITTLE_ENDIAN          1
+#endif
 #define __CM0PLUS_REV          1         /*!< Core revision r0p1 */
 #define __MPU_PRESENT          0         /*!< MPU present or not */
 #define __NVIC_PRIO_BITS       2         /*!< Number of bits used for Priority Levels */

bootloaders/mzero/Bootloader_D21/src/ASF/sam0/utils/cmsis/samd21/include/samd21e18a.h

@@ -218,7 +218,11 @@ void I2S_Handler                 ( void );
  * \brief Configuration of the Cortex-M0+ Processor and Core Peripherals
  */
 
-#define LITTLE_ENDIAN          1        
+#if defined(LITTLE_ENDIAN) && (LITTLE_ENDIAN != 1)
+  #error "Little Endian is already defined, but to different value than expected?!"
+#else
+  #define LITTLE_ENDIAN          1
+#endif
 #define __CM0PLUS_REV          1         /*!< Core revision r0p1 */
 #define __MPU_PRESENT          0         /*!< MPU present or not */
 #define __NVIC_PRIO_BITS       2         /*!< Number of bits used for Priority Levels */

bootloaders/mzero/Bootloader_D21/src/ASF/sam0/utils/cmsis/samd21/include/samd21g15a.h

@@ -222,7 +222,11 @@ void I2S_Handler                 ( void );
  * \brief Configuration of the Cortex-M0+ Processor and Core Peripherals
  */
 
-#define LITTLE_ENDIAN          1        
+#if defined(LITTLE_ENDIAN) && (LITTLE_ENDIAN != 1)
+  #error "Little Endian is already defined, but to different value than expected?!"
+#else
+  #define LITTLE_ENDIAN          1
+#endif
 #define __CM0PLUS_REV          1         /*!< Core revision r0p1 */
 #define __MPU_PRESENT          0         /*!< MPU present or not */
 #define __NVIC_PRIO_BITS       2         /*!< Number of bits used for Priority Levels */

bootloaders/mzero/Bootloader_D21/src/ASF/sam0/utils/cmsis/samd21/include/samd21g16a.h

@@ -222,7 +222,11 @@ void I2S_Handler                 ( void );
  * \brief Configuration of the Cortex-M0+ Processor and Core Peripherals
  */
 
-#define LITTLE_ENDIAN          1        
+#if defined(LITTLE_ENDIAN) && (LITTLE_ENDIAN != 1)
+  #error "Little Endian is already defined, but to different value than expected?!"
+#else
+  #define LITTLE_ENDIAN          1
+#endif
 #define __CM0PLUS_REV          1         /*!< Core revision r0p1 */
 #define __MPU_PRESENT          0         /*!< MPU present or not */
 #define __NVIC_PRIO_BITS       2         /*!< Number of bits used for Priority Levels */

bootloaders/mzero/Bootloader_D21/src/ASF/sam0/utils/cmsis/samd21/include/samd21g17a.h

@@ -222,7 +222,11 @@ void I2S_Handler                 ( void );
  * \brief Configuration of the Cortex-M0+ Processor and Core Peripherals
  */
 
-#define LITTLE_ENDIAN          1        
+#if defined(LITTLE_ENDIAN) && (LITTLE_ENDIAN != 1)
+  #error "Little Endian is already defined, but to different value than expected?!"
+#else
+  #define LITTLE_ENDIAN          1
+#endif
 #define __CM0PLUS_REV          1         /*!< Core revision r0p1 */
 #define __MPU_PRESENT          0         /*!< MPU present or not */
 #define __NVIC_PRIO_BITS       2         /*!< Number of bits used for Priority Levels */

bootloaders/mzero/Bootloader_D21/src/ASF/sam0/utils/cmsis/samd21/include/samd21g18a.h

@@ -222,7 +222,11 @@ void I2S_Handler                 ( void );
  * \brief Configuration of the Cortex-M0+ Processor and Core Peripherals
  */
 
-#define LITTLE_ENDIAN          1        
+#if defined(LITTLE_ENDIAN) && (LITTLE_ENDIAN != 1)
+  #error "Little Endian is already defined, but to different value than expected?!"
+#else
+  #define LITTLE_ENDIAN          1
+#endif
 #define __CM0PLUS_REV          1         /*!< Core revision r0p1 */
 #define __MPU_PRESENT          0         /*!< MPU present or not */
 #define __NVIC_PRIO_BITS       2         /*!< Number of bits used for Priority Levels */

bootloaders/mzero/Bootloader_D21/src/ASF/sam0/utils/cmsis/samd21/include/samd21j15a.h

@@ -226,7 +226,11 @@ void I2S_Handler                 ( void );
  * \brief Configuration of the Cortex-M0+ Processor and Core Peripherals
  */
 
-#define LITTLE_ENDIAN          1        
+#if defined(LITTLE_ENDIAN) && (LITTLE_ENDIAN != 1)
+  #error "Little Endian is already defined, but to different value than expected?!"
+#else
+  #define LITTLE_ENDIAN          1
+#endif
 #define __CM0PLUS_REV          1         /*!< Core revision r0p1 */
 #define __MPU_PRESENT          0         /*!< MPU present or not */
 #define __NVIC_PRIO_BITS       2         /*!< Number of bits used for Priority Levels */

bootloaders/mzero/Bootloader_D21/src/ASF/sam0/utils/cmsis/samd21/include/samd21j16a.h

@@ -226,7 +226,11 @@ void I2S_Handler                 ( void );
  * \brief Configuration of the Cortex-M0+ Processor and Core Peripherals
  */
 
-#define LITTLE_ENDIAN          1        
+#if defined(LITTLE_ENDIAN) && (LITTLE_ENDIAN != 1)
+  #error "Little Endian is already defined, but to different value than expected?!"
+#else
+  #define LITTLE_ENDIAN          1
+#endif
 #define __CM0PLUS_REV          1         /*!< Core revision r0p1 */
 #define __MPU_PRESENT          0         /*!< MPU present or not */
 #define __NVIC_PRIO_BITS       2         /*!< Number of bits used for Priority Levels */

bootloaders/mzero/Bootloader_D21/src/ASF/sam0/utils/cmsis/samd21/include/samd21j17a.h

@@ -226,7 +226,11 @@ void I2S_Handler                 ( void );
  * \brief Configuration of the Cortex-M0+ Processor and Core Peripherals
  */
 
-#define LITTLE_ENDIAN          1        
+#if defined(LITTLE_ENDIAN) && (LITTLE_ENDIAN != 1)
+  #error "Little Endian is already defined, but to different value than expected?!"
+#else
+  #define LITTLE_ENDIAN          1
+#endif
 #define __CM0PLUS_REV          1         /*!< Core revision r0p1 */
 #define __MPU_PRESENT          0         /*!< MPU present or not */
 #define __NVIC_PRIO_BITS       2         /*!< Number of bits used for Priority Levels */

bootloaders/mzero/Bootloader_D21/src/ASF/sam0/utils/cmsis/samd21/include/samd21j18a.h

@@ -226,7 +226,11 @@ void I2S_Handler                 ( void );
  * \brief Configuration of the Cortex-M0+ Processor and Core Peripherals
  */
 
-#define LITTLE_ENDIAN          1        
+#if defined(LITTLE_ENDIAN) && (LITTLE_ENDIAN != 1)
+  #error "Little Endian is already defined, but to different value than expected?!"
+#else
+  #define LITTLE_ENDIAN          1
+#endif
 #define __CM0PLUS_REV          1         /*!< Core revision r0p1 */
 #define __MPU_PRESENT          0         /*!< MPU present or not */
 #define __NVIC_PRIO_BITS       2         /*!< Number of bits used for Priority Levels */