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

@@ -1,5 +1,40 @@
 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)

README.md

@@ -1,48 +1,17 @@
 # Arduino Core for SAMD21 and SAMD51 CPU
 
-## Known Issues:
-* gcc optimizations must be off for sketches to work consistently. We are working to track this down.
-* 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
-* I2S doesn't work yet
+[![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
 
+* 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
+
 If you find a bug you can submit an issue here on github:
 
 https://github.com/adafruit/ArduinoCore-samd

bootloaders/mkrnb1500/samd21_sam_ba_arduino_mkrnb1500.hex

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+:101F080009040100020A00000007058102400000E0
+:101F1800070502024000000000C20100000008009E
+:0C1F280069000000410000000000000003
+: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
  */
 
+#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
  */
 
+#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
  */
 
+#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
  */
 
+#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
  */
 
+#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
  */
 
+#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
  */
 
+#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
  */
 
+#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
  */
 
+#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
  */
 
+#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
  */
 
+#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
  */
 
+#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/sofia/Bootloader_D21_Sofia_V2.1/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
  */
 
+#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/sofia/Bootloader_D21_Sofia_V2.1/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
  */
 
+#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/sofia/Bootloader_D21_Sofia_V2.1/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
  */
 
+#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/sofia/Bootloader_D21_Sofia_V2.1/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
  */
 
+#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/sofia/Bootloader_D21_Sofia_V2.1/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
  */
 
+#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/sofia/Bootloader_D21_Sofia_V2.1/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
  */
 
+#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/sofia/Bootloader_D21_Sofia_V2.1/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
  */
 
+#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/sofia/Bootloader_D21_Sofia_V2.1/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
  */
 
+#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/sofia/Bootloader_D21_Sofia_V2.1/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
  */
 
+#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/sofia/Bootloader_D21_Sofia_V2.1/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
  */
 
+#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/sofia/Bootloader_D21_Sofia_V2.1/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
  */
 
+#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/sofia/Bootloader_D21_Sofia_V2.1/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
  */
 
+#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/zero/board_definitions.h

@@ -20,6 +20,35 @@
 #ifndef _BOARD_DEFINITIONS_H_
 #define _BOARD_DEFINITIONS_H_
 
+#if defined(BOARD_ID_arduino_zero)
+  #include "board_definitions_arduino_zero.h"
+#elif defined(BOARD_ID_genuino_zero)
+  #include "board_definitions_genuino_zero.h"
+#elif defined(BOARD_ID_arduino_mkr1000)
+  #include "board_definitions_arduino_mkr1000.h"
+#elif defined(BOARD_ID_genuino_mkr1000)
+  #include "board_definitions_genuino_mkr1000.h"
+#elif defined(BOARD_ID_arduino_mkrzero)
+  #include "board_definitions_arduino_mkrzero.h"
+#elif defined(BOARD_ID_arduino_mkrfox1200)
+  #include "board_definitions_arduino_mkrfox1200.h"
+#elif defined(BOARD_ID_arduino_mkrgsm1400)
+  #include "board_definitions_arduino_mkrgsm1400.h"
+#elif defined(BOARD_ID_arduino_mkrwan1300)
+  #include "board_definitions_arduino_mkrwan1300.h"
+#elif defined(BOARD_ID_arduino_mkrwifi1010)
+  #include "board_definitions_arduino_mkrwifi1010.h"
+#elif defined(BOARD_ID_arduino_mkrnb1500)
+  #include "board_definitions_arduino_mkrnb1500.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))
+
 /*
  * If BOOT_DOUBLE_TAP_ADDRESS is defined the bootloader is started by
  * quickly tapping two times on the reset button.

bootloaders/zero/board_definitions_arduino_mkrnb1500.h

@@ -0,0 +1,86 @@
+/*
+  Copyright (c) 2016 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
+*/
+
+#ifndef _BOARD_DEFINITIONS_H_
+#define _BOARD_DEFINITIONS_H_
+
+/*
+ * USB device definitions
+ */
+#define STRING_PRODUCT "Arduino MKR NB 1500"
+#define USB_VID_HIGH   0x23
+#define USB_VID_LOW    0x41
+#define USB_PID_HIGH   0x00
+#define USB_PID_LOW    0x55
+
+/*
+ * 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           (0x20007FFCul)
+#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
+//#define BOOT_LOAD_PIN                     PIN_PA15
+
+#define BOOT_USART_MODULE                 SERCOM5
+#define BOOT_USART_BUS_CLOCK_INDEX        PM_APBCMASK_SERCOM5
+#define BOOT_USART_PER_CLOCK_INDEX        GCLK_CLKCTRL_ID_SERCOM5_CORE_Val
+#define BOOT_USART_PAD_SETTINGS           UART_RX_PAD3_TX_PAD2
+#define BOOT_USART_PAD3                   PINMUX_PB23D_SERCOM5_PAD3
+#define BOOT_USART_PAD2                   PINMUX_PB22D_SERCOM5_PAD2
+#define BOOT_USART_PAD1                   PINMUX_UNUSED
+#define BOOT_USART_PAD0                   PINMUX_UNUSED
+
+/* 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)
+
+/*
+ * LEDs definitions
+ */
+// PA20 (digital pin 6)
+#define BOARD_LED_PORT                    (0)
+#define BOARD_LED_PIN                     (20)
+
+#define CONFIGURE_PMIC                    1
+#define PMIC_PIN_SCL                      12
+#define PMIC_PIN_SDA                      11
+#define PMIC_SERCOM                       SERCOM0                      
+
+// No RX/TX led
+//#define BOARD_LEDRX_PORT
+//#define BOARD_LEDRX_PIN
+
+//#define BOARD_LEDTX_PORT
+//#define BOARD_LEDTX_PIN
+
+#endif // _BOARD_DEFINITIONS_H_

bootloaders/zero/build_all_bootloaders.sh

@@ -25,5 +25,8 @@ mv -v samd21_sam_ba_arduino_mkrwan1300.* ../mkrwan1300/
 BOARD_ID=arduino_mkrwifi1010 NAME=samd21_sam_ba_arduino_mkrwifi1010 make clean all
 mv -v samd21_sam_ba_arduino_mkrwifi1010.* ../mkrwifi1010/
 
+BOARD_ID=arduino_mkrnb1500 NAME=samd21_sam_ba_arduino_mkrnb1500 make clean all
+mv -v samd21_sam_ba_arduino_mkrnb1500.* ../mkrnb1500/
+
 echo Done building bootloaders!
 

cores/arduino/Arduino.h

@@ -46,7 +46,6 @@ extern "C"{
 
 // Include Atmel headers
 #include "sam.h"
-
 #include "wiring_constants.h"
 
 #define clockCyclesPerMicrosecond() ( SystemCoreClock / 1000000L )
@@ -97,8 +96,33 @@ void loop( void ) ;
 #undef abs
 #endif // abs
 
-#define min(a,b) ((a)<(b)?(a):(b))
-#define max(a,b) ((a)>(b)?(a):(b))
+#ifdef __cplusplus
+  template<class T, class L> 
+  auto min(const T& a, const L& b) -> decltype((b < a) ? b : a)
+  {
+    return (b < a) ? b : a;
+  }
+
+  template<class T, class L> 
+  auto max(const T& a, const L& b) -> decltype((b < a) ? b : a)
+  {
+    return (a < b) ? b : a;
+  }
+#else
+#ifndef min
+#define min(a,b) \
+   ({ __typeof__ (a) _a = (a); \
+       __typeof__ (b) _b = (b); \
+     _a < _b ? _a : _b; })
+#endif
+#ifndef max
+#define max(a,b) \
+   ({ __typeof__ (a) _a = (a); \
+       __typeof__ (b) _b = (b); \
+     _a > _b ? _a : _b; })
+#endif
+#endif
+
 #define abs(x) ((x)>0?(x):-(x))
 #define constrain(amt,low,high) ((amt)<(low)?(low):((amt)>(high)?(high):(amt)))
 #define round(x)     ((x)>=0?(long)((x)+0.5):(long)((x)-0.5))
@@ -124,10 +148,15 @@ void loop( void ) ;
 #define digitalPinToInterrupt(P)   ( P )
 #endif
 
-// USB Device
+// USB
+#ifdef USE_TINYUSB
+  // Needed for declaring Serial
+  #include "Adafruit_USBD_CDC.h"
+#else
   #include "USB/USBDesc.h"
   #include "USB/USBCore.h"
   #include "USB/USBAPI.h"
   #include "USB/USB_host.h"
+#endif
 
 #endif // Arduino_h

cores/arduino/HardwareSerial.h

@@ -68,7 +68,7 @@ class HardwareSerial : public Stream
 {
   public:
     virtual void begin(unsigned long) {}
-    virtual void begin(unsigned long baudrate, uint16_t config) {}
+    virtual void begin(unsigned long, uint16_t) {}
     virtual void end() {}
     virtual int available(void) = 0;
     virtual int peek(void) = 0;

cores/arduino/Print.cpp

@@ -94,6 +94,28 @@ size_t Print::print(unsigned long n, int base)
   else return printNumber(n, base);
 }
 
+size_t Print::print(long long n, int base)
+{
+  if (base == 0) {
+    return write(n);
+  } else if (base == 10) {
+    if (n < 0) {
+      int t = print('-');
+      n = -n;
+      return printULLNumber(n, 10) + t;
+    }
+    return printULLNumber(n, 10);
+  } else {
+    return printULLNumber(n, base);
+  }
+}
+
+size_t Print::print(unsigned long long n, int base)
+{
+  if (base == 0) return write(n);
+  else return printULLNumber(n, base);
+}
+
 size_t Print::print(double n, int digits)
 {
   return printFloat(n, digits);
@@ -172,6 +194,20 @@ size_t Print::println(unsigned long num, int base)
   return n;
 }
 
+size_t Print::println(long long num, int base)
+{
+  size_t n = print(num, base);
+  n += println();
+  return n;
+}
+
+size_t Print::println(unsigned long long num, int base)
+{
+  size_t n = print(num, base);
+  n += println();
+  return n;
+}
+
 size_t Print::println(double num, int digits)
 {
   size_t n = print(num, digits);
@@ -186,6 +222,16 @@ size_t Print::println(const Printable& x)
   return n;
 }
 
+void Print::printf(const char format[], ...)
+{
+  char buf[PRINTF_BUF];
+  va_list ap;
+  va_start(ap, format);
+  vsnprintf(buf, sizeof(buf), format, ap);
+  write(buf);
+  va_end(ap);
+}
+
 // Private Methods /////////////////////////////////////////////////////////////
 
 size_t Print::printNumber(unsigned long n, uint8_t base)
@@ -208,6 +254,81 @@ size_t Print::printNumber(unsigned long n, uint8_t base)
   return write(str);
 }
 
+// REFERENCE IMPLEMENTATION FOR ULL
+// size_t Print::printULLNumber(unsigned long long n, uint8_t base)
+// {
+  // // if limited to base 10 and 16 the bufsize can be smaller
+  // char buf[65];
+  // char *str = &buf[64];
+
+  // *str = '\0';
+
+  // // prevent crash if called with base == 1
+  // if (base < 2) base = 10;
+
+    // do {
+      // unsigned long long t = n / base;
+      // char c = n - t * base;  // faster than c = n%base;
+      // n = t;
+      // *--str = c < 10 ? c + '0' : c + 'A' - 10;
+  // } while(n);
+
+  // return write(str);
+// }
+
+// FAST IMPLEMENTATION FOR ULL
+size_t Print::printULLNumber(unsigned long long n64, uint8_t base)
+{
+  // if limited to base 10 and 16 the bufsize can be 20
+  char buf[64];
+  uint8_t i = 0;
+  uint8_t innerLoops = 0;
+
+  // prevent crash if called with base == 1
+  if (base < 2) base = 10;
+
+  // process chunks that fit in "16 bit math".
+  uint16_t top = 0xFFFF / base;
+  uint16_t th16 = 1;
+  while (th16 < top)
+  {
+    th16 *= base;
+    innerLoops++;
+  }
+
+  while (n64 > th16)
+  {
+    // 64 bit math part
+    uint64_t q = n64 / th16;
+    uint16_t r = n64 - q*th16;
+    n64 = q;
+
+    // 16 bit math loop to do remainder. (note buffer is filled reverse)
+    for (uint8_t j=0; j < innerLoops; j++)
+    {
+      uint16_t qq = r/base;
+      buf[i++] = r - qq*base;
+      r = qq;
+    }
+  }
+
+  uint16_t n16 = n64;
+  while (n16 > 0)
+  {
+    uint16_t qq = n16/base;
+    buf[i++] = n16 - qq*base;
+    n16 = qq;
+  }
+
+  size_t bytes = i;
+  for (; i > 0; i--)
+    write((char) (buf[i - 1] < 10 ?
+    '0' + buf[i - 1] :
+    'A' + buf[i - 1] - 10));
+
+  return bytes;
+}
+
 size_t Print::printFloat(double number, uint8_t digits)
 {
   size_t n = 0;
@@ -238,17 +359,18 @@ size_t Print::printFloat(double number, uint8_t digits)
 
   // Print the decimal point, but only if there are digits beyond
   if (digits > 0) {
-    n += print('.');
+    n += print(".");
   }
 
   // Extract digits from the remainder one at a time
   while (digits-- > 0)
   {
     remainder *= 10.0;
-    unsigned int toPrint = (unsigned int)(remainder);
+    unsigned int toPrint = (unsigned int)remainder;
     n += print(toPrint);
     remainder -= toPrint;
   }
 
   return n;
 }
+

cores/arduino/Print.h

@@ -21,6 +21,8 @@
 
 #include <inttypes.h>
 #include <stdio.h> // for size_t
+#include <stdarg.h> // for printf
+#define PRINTF_BUF 80
 
 #include "WString.h"
 #include "Printable.h"
@@ -28,9 +30,6 @@
 #define DEC 10
 #define HEX 16
 #define OCT 8
-#ifdef BIN // Prevent warnings if BIN is previously defined in "iotnx4.h" or similar
-#undef BIN
-#endif
 #define BIN 2
 
 class Print
@@ -38,6 +37,7 @@ class Print
   private:
     int write_error;
     size_t printNumber(unsigned long, uint8_t);
+    size_t printULLNumber(unsigned long long, uint8_t);
     size_t printFloat(double, uint8_t);
   protected:
     void setWriteError(int err = 1) { write_error = err; }
@@ -70,6 +70,8 @@ class Print
     size_t print(unsigned int, int = DEC);
     size_t print(long, int = DEC);
     size_t print(unsigned long, int = DEC);
+    size_t print(long long, int = DEC);
+    size_t print(unsigned long long, int = DEC);
     size_t print(double, int = 2);
     size_t print(const Printable&);
 
@@ -82,10 +84,14 @@ class Print
     size_t println(unsigned int, int = DEC);
     size_t println(long, int = DEC);
     size_t println(unsigned long, int = DEC);
+    size_t println(long long, int = DEC);
+    size_t println(unsigned long long, int = DEC);
     size_t println(double, int = 2);
     size_t println(const Printable&);
     size_t println(void);
     
+    void printf(const char[], ...);
+
     virtual void flush() { /* Empty implementation for backward compatibility */ }
 };
 

cores/arduino/Reset.cpp

@@ -29,7 +29,7 @@ extern "C" {
 #if (ARDUINO_SAMD_VARIANT_COMPLIANCE >= 10610)
 
 extern const uint32_t __text_start__;
-#define APP_START ((volatile uint32_t)(&__text_start__) + 4)
+#define APP_START ((uint32_t)(&__text_start__) + 4)
 
 #else
 

cores/arduino/RingBuffer.h

@@ -27,7 +27,10 @@
 // using a ring buffer (I think), in which head is the index of the location
 // to which to write the next incoming character and tail is the index of the
 // location from which to read.
-#define SERIAL_BUFFER_SIZE 164
+
+#ifndef SERIAL_BUFFER_SIZE
+#define SERIAL_BUFFER_SIZE 350
+#endif
 
 template <int N>
 class RingBufferN

cores/arduino/SERCOM.cpp

@@ -30,6 +30,24 @@
 SERCOM::SERCOM(Sercom* s)
 {
   sercom = s;
+
+#if defined(__SAMD51__)
+  // A briefly-available but now deprecated feature had the SPI clock source
+  // set via a compile-time setting (MAX_SPI)...problem was this affected
+  // ALL SERCOMs, whereas some (anything read/write, e.g. SD cards) should
+  // not exceed the standard 24 MHz setting.  Newer code, if it needs faster
+  // write-only SPI (e.g. to screen), should override the SERCOM clock on a
+  // per-peripheral basis.  Nonetheless, we check SERCOM_SPI_FREQ_REF here
+  // (MAX_SPI * 2) to retain compatibility with any interim projects that
+  // might have relied on the compile-time setting.  But please, don't.
+ #if SERCOM_SPI_FREQ_REF == F_CPU       // F_CPU clock = GCLK0
+  clockSource = SERCOM_CLOCK_SOURCE_FCPU;
+ #elif SERCOM_SPI_FREQ_REF == 48000000  // 48 MHz clock = GCLK1 (standard)
+  clockSource = SERCOM_CLOCK_SOURCE_48M;
+ #elif SERCOM_SPI_FREQ_REF == 100000000 // 100 MHz clock = GCLK2
+  clockSource = SERCOM_CLOCK_SOURCE_100M;
+ #endif
+#endif // end __SAMD51__
 }
 
 /* =========================
@@ -75,13 +93,15 @@ void SERCOM::initUART(SercomUartMode mode, SercomUartSampleRate sampleRate, uint
 void SERCOM::initFrame(SercomUartCharSize charSize, SercomDataOrder dataOrder, SercomParityMode parityMode, SercomNumberStopBit nbStopBits)
 {
   //Setting the CTRLA register
-  sercom->USART.CTRLA.reg |=	SERCOM_USART_CTRLA_FORM( (parityMode == SERCOM_NO_PARITY ? 0 : 1) ) |
+  sercom->USART.CTRLA.reg |=
+    SERCOM_USART_CTRLA_FORM((parityMode == SERCOM_NO_PARITY ? 0 : 1) ) |
     dataOrder << SERCOM_USART_CTRLA_DORD_Pos;
 
   //Setting the CTRLB register
   sercom->USART.CTRLB.reg |= SERCOM_USART_CTRLB_CHSIZE(charSize) |
     nbStopBits << SERCOM_USART_CTRLB_SBMODE_Pos |
-                (parityMode == SERCOM_NO_PARITY ? 0 : parityMode) << SERCOM_USART_CTRLB_PMODE_Pos; //If no parity use default value
+    (parityMode == SERCOM_NO_PARITY ? 0 : parityMode) <<
+      SERCOM_USART_CTRLB_PMODE_Pos; //If no parity use default value
 }
 
 void SERCOM::initPads(SercomUartTXPad txPad, SercomRXPad rxPad)
@@ -228,7 +248,6 @@ void SERCOM::initSPI(SercomSpiTXPad mosi, SercomRXPad miso, SercomSpiCharSize ch
                           SERCOM_SPI_CTRLB_RXEN; //Active the SPI receiver.
 
   while( sercom->SPI.SYNCBUSY.bit.CTRLB == 1 );
-  
 }
 
 void SERCOM::initSPIClock(SercomSpiClockMode clockMode, uint32_t baudrate)
@@ -302,14 +321,13 @@ SercomDataOrder SERCOM::getDataOrderSPI()
 
 void SERCOM::setBaudrateSPI(uint8_t divider)
 {
-  //Can't divide by 0
-  if(divider == 0)
-    return;
+  disableSPI(); // Register is enable-protected
 
-  //Register enable-protected
-  disableSPI();
-
-  sercom->SPI.BAUD.reg = calculateBaudrateSynchronous( SERCOM_FREQ_REF / divider );
+#if defined(__SAMD51__)
+  sercom->SPI.BAUD.reg = calculateBaudrateSynchronous(freqRef / divider);
+#else
+  sercom->SPI.BAUD.reg = calculateBaudrateSynchronous(SERCOM_SPI_FREQ_REF / divider);
+#endif
 
   enableSPI();
 }
@@ -340,10 +358,7 @@ uint8_t SERCOM::transferDataSPI(uint8_t data)
 {
   sercom->SPI.DATA.bit.DATA = data; // Writing data into Data register
 
-  while( sercom->SPI.INTFLAG.bit.RXC == 0 )
-  {
-    // Waiting Complete Reception
-  }
+  while(sercom->SPI.INTFLAG.bit.RXC == 0); // Waiting Complete Reception
 
   return sercom->SPI.DATA.bit.DATA;  // Reading data
 }
@@ -371,9 +386,14 @@ bool SERCOM::isDataRegisterEmptySPI()
 //  return sercom->SPI.INTFLAG.bit.RXC;
 //}
 
-uint8_t SERCOM::calculateBaudrateSynchronous(uint32_t baudrate)
-{
-  return SERCOM_FREQ_REF / (2 * baudrate) - 1;
+uint8_t SERCOM::calculateBaudrateSynchronous(uint32_t baudrate) {
+#if defined(__SAMD51__)
+  uint16_t b = freqRef / (2 * baudrate);
+#else
+  uint16_t b = SERCOM_SPI_FREQ_REF / (2 * baudrate);
+#endif
+  if(b > 0) b--; // Don't -1 on baud calc if already at 0
+  return b;
 }
 
 
@@ -517,8 +537,18 @@ bool SERCOM::startTransmissionWIRE(uint8_t address, SercomWireReadWriteFlag flag
   // 7-bits address + 1-bits R/W
   address = (address << 0x1ul) | flag;
 
-  // Wait idle or owner bus mode
-   while ( !isBusIdleWIRE() && !isBusOwnerWIRE() );
+  // If another master owns the bus or the last bus owner has not properly
+  // sent a stop, return failure early. This will prevent some misbehaved
+  // devices from deadlocking here at the cost of the caller being responsible
+  // for retrying the failed transmission. See SercomWireBusState for the
+  // possible bus states.
+  if(!isBusOwnerWIRE())
+  {
+    if( isBusBusyWIRE() || (isArbLostWIRE() && !isBusIdleWIRE()) || isBusUnknownWIRE() )
+    {
+      return false;
+    }
+  }
 
   // Send start and address
   sercom->I2CM.ADDR.bit.ADDR = address;
@@ -526,29 +556,35 @@ bool SERCOM::startTransmissionWIRE(uint8_t address, SercomWireReadWriteFlag flag
   // Address Transmitted
   if ( flag == WIRE_WRITE_FLAG ) // Write mode
   {
-    while( !sercom->I2CM.INTFLAG.bit.MB )
-    {
+    while( !sercom->I2CM.INTFLAG.bit.MB ) {
       // Wait transmission complete
+
+      // If certain errors occur, the MB bit may never be set (RFTM: SAMD21 sec:28.10.6; SAMD51 sec:36.10.7).
+      // The data transfer errors that can occur (including BUSERR) are all
+      // rolled up into INTFLAG.bit.ERROR from STATUS.reg
+      if (sercom->I2CM.INTFLAG.bit.ERROR) {
+        return false;
+      }
     }
   }
   else  // Read mode
   {
-    while( !sercom->I2CM.INTFLAG.bit.SB )
-    {
+    while( !sercom->I2CM.INTFLAG.bit.SB ) {
+      // Wait transmission complete
+
       // If the slave NACKS the address, the MB bit will be set.
+      // A variety of errors in the STATUS register can set the ERROR bit in the INTFLAG register
       // In that case, send a stop condition and return false.
-        if (sercom->I2CM.INTFLAG.bit.MB) {
+      if (sercom->I2CM.INTFLAG.bit.MB || sercom->I2CM.INTFLAG.bit.ERROR) {
         sercom->I2CM.CTRLB.bit.CMD = 3; // Stop condition
         return false;
       }
-      // Wait transmission complete
     }
 
     // Clean the 'Slave on Bus' flag, for further usage.
     //sercom->I2CM.INTFLAG.bit.SB = 0x1ul;
   }
 
-
   //ACK received (0: ACK, 1: NACK)
   if(sercom->I2CM.STATUS.bit.RXNACK)
   {
@@ -567,10 +603,11 @@ bool SERCOM::sendDataMasterWIRE(uint8_t data)
 
   //Wait transmission successful
   while(!sercom->I2CM.INTFLAG.bit.MB) {
-
-    // If a bus error occurs, the MB bit may never be set.
-    // Check the bus error bit and bail if it's set.
-    if (sercom->I2CM.STATUS.bit.BUSERR) {
+    // If a data transfer error occurs, the MB bit may never be set.
+    // Check the error bit and bail if it's set.
+    // The data transfer errors that can occur (including BUSERR) are all
+    // rolled up into INTFLAG.bit.ERROR from STATUS.reg
+    if (sercom->I2CM.INTFLAG.bit.ERROR) {
       return false;
     }
   }
@@ -614,6 +651,21 @@ bool SERCOM::isBusOwnerWIRE( void )
   return sercom->I2CM.STATUS.bit.BUSSTATE == WIRE_OWNER_STATE;
 }
 
+bool SERCOM::isBusUnknownWIRE( void )
+{
+  return sercom->I2CM.STATUS.bit.BUSSTATE == WIRE_UNKNOWN_STATE;
+}
+
+bool SERCOM::isArbLostWIRE( void )
+{
+  return sercom->I2CM.STATUS.bit.ARBLOST == 1;
+}
+
+bool SERCOM::isBusBusyWIRE( void )
+{
+  return sercom->I2CM.STATUS.bit.BUSSTATE == WIRE_BUSY_STATE;
+}
+
 bool SERCOM::isDataReadyWIRE( void )
 {
   return sercom->I2CS.INTFLAG.bit.DRDY;
@@ -656,9 +708,17 @@ uint8_t SERCOM::readDataWIRE( void )
 {
   if(isMasterWIRE())
   {
-    while( sercom->I2CM.INTFLAG.bit.SB == 0 )
-    {
+    while (sercom->I2CM.INTFLAG.bit.SB == 0) {
       // Waiting complete receive
+      // A variety of errors in the STATUS register can set the ERROR bit in the INTFLAG register
+      // In that case, send a stop condition and return false.
+      // readDataWIRE should really be able to indicate an error (which would never be used
+      // because the readDataWIRE callers (in Wire.cpp) should have checked availableWIRE() first and timed it
+      // out if the data never showed up
+      if (sercom->I2CM.INTFLAG.bit.MB || sercom->I2CM.INTFLAG.bit.ERROR) {
+        sercom->I2CM.CTRLB.bit.CMD = 3; // Stop condition
+        return 0xFF;
+      }
     }
 
     return sercom->I2CM.DATA.bit.DATA ;
@@ -669,199 +729,152 @@ uint8_t SERCOM::readDataWIRE( void )
   }
 }
 
+#if defined(__SAMD51__)
+
+static const struct {
+  Sercom   *sercomPtr;
+  uint8_t   id_core;
+  uint8_t   id_slow;
+  IRQn_Type irq[4];
+} sercomData[] = {
+  { SERCOM0, SERCOM0_GCLK_ID_CORE, SERCOM0_GCLK_ID_SLOW,
+    SERCOM0_0_IRQn, SERCOM0_1_IRQn, SERCOM0_2_IRQn, SERCOM0_3_IRQn },
+  { SERCOM1, SERCOM1_GCLK_ID_CORE, SERCOM1_GCLK_ID_SLOW,
+    SERCOM1_0_IRQn, SERCOM1_1_IRQn, SERCOM1_2_IRQn, SERCOM1_3_IRQn },
+  { SERCOM2, SERCOM2_GCLK_ID_CORE, SERCOM2_GCLK_ID_SLOW,
+    SERCOM2_0_IRQn, SERCOM2_1_IRQn, SERCOM2_2_IRQn, SERCOM2_3_IRQn },
+  { SERCOM3, SERCOM3_GCLK_ID_CORE, SERCOM3_GCLK_ID_SLOW,
+    SERCOM3_0_IRQn, SERCOM3_1_IRQn, SERCOM3_2_IRQn, SERCOM3_3_IRQn },
+  { SERCOM4, SERCOM4_GCLK_ID_CORE, SERCOM4_GCLK_ID_SLOW,
+    SERCOM4_0_IRQn, SERCOM4_1_IRQn, SERCOM4_2_IRQn, SERCOM4_3_IRQn },
+  { SERCOM5, SERCOM5_GCLK_ID_CORE, SERCOM5_GCLK_ID_SLOW,
+    SERCOM5_0_IRQn, SERCOM5_1_IRQn, SERCOM5_2_IRQn, SERCOM5_3_IRQn },
+#if defined(SERCOM6)
+  { SERCOM6, SERCOM6_GCLK_ID_CORE, SERCOM6_GCLK_ID_SLOW,
+    SERCOM6_0_IRQn, SERCOM6_1_IRQn, SERCOM6_2_IRQn, SERCOM6_3_IRQn },
+#endif
+#if defined(SERCOM7)
+  { SERCOM7, SERCOM7_GCLK_ID_CORE, SERCOM7_GCLK_ID_SLOW,
+    SERCOM7_0_IRQn, SERCOM7_1_IRQn, SERCOM7_2_IRQn, SERCOM7_3_IRQn },
+#endif
+};
+
+#else // end if SAMD51 (prob SAMD21)
+
+static const struct {
+  Sercom   *sercomPtr;
+  uint8_t   clock;
+  IRQn_Type irqn;
+} sercomData[] = {
+  SERCOM0, GCM_SERCOM0_CORE, SERCOM0_IRQn,
+  SERCOM1, GCM_SERCOM1_CORE, SERCOM1_IRQn,
+  SERCOM2, GCM_SERCOM2_CORE, SERCOM2_IRQn,
+  SERCOM3, GCM_SERCOM3_CORE, SERCOM3_IRQn,
+#if defined(SERCOM4)
+  SERCOM4, GCM_SERCOM4_CORE, SERCOM4_IRQn,
+#endif
+#if defined(SERCOM5)
+  SERCOM5, GCM_SERCOM5_CORE, SERCOM5_IRQn,
+#endif
+};
+
+#endif // end !SAMD51
+
+int8_t SERCOM::getSercomIndex(void) {
+  for(uint8_t i=0; i<(sizeof(sercomData) / sizeof(sercomData[0])); i++) {
+    if(sercom == sercomData[i].sercomPtr) return i;
+  }
+  return -1;
+}
+
+#if defined(__SAMD51__)
+// This is currently for overriding an SPI SERCOM's clock source only --
+// NOT for UART or WIRE SERCOMs, where it will have unintended consequences.
+// It does not check.
+// SERCOM clock source override is available only on SAMD51 (not 21).
+// A dummy function for SAMD21 (compiles to nothing) is present in SERCOM.h
+// so user code doesn't require a lot of conditional situations.
+void SERCOM::setClockSource(int8_t idx, SercomClockSource src, bool core) {
+
+  if(src == SERCOM_CLOCK_SOURCE_NO_CHANGE) return;
+
+  uint8_t clk_id = core ? sercomData[idx].id_core : sercomData[idx].id_slow;
+
+  GCLK->PCHCTRL[clk_id].bit.CHEN = 0;     // Disable timer
+  while(GCLK->PCHCTRL[clk_id].bit.CHEN);  // Wait for disable
+
+  if(core) clockSource = src; // Save SercomClockSource value
+
+  // From cores/arduino/startup.c:
+  // GCLK0 = F_CPU
+  // GCLK1 = 48 MHz
+  // GCLK2 = 100 MHz
+  // GCLK3 = XOSC32K
+  // GCLK4 = 12 MHz
+  if(src == SERCOM_CLOCK_SOURCE_FCPU) {
+    GCLK->PCHCTRL[clk_id].reg =
+      GCLK_PCHCTRL_GEN_GCLK0_Val | (1 << GCLK_PCHCTRL_CHEN_Pos);
+    if(core) freqRef = F_CPU; // Save clock frequency value
+  } else if(src == SERCOM_CLOCK_SOURCE_48M) {
+    GCLK->PCHCTRL[clk_id].reg =
+      GCLK_PCHCTRL_GEN_GCLK1_Val | (1 << GCLK_PCHCTRL_CHEN_Pos);
+    if(core) freqRef = 48000000;
+  } else if(src == SERCOM_CLOCK_SOURCE_100M) {
+    GCLK->PCHCTRL[clk_id].reg =
+      GCLK_PCHCTRL_GEN_GCLK2_Val | (1 << GCLK_PCHCTRL_CHEN_Pos);
+    if(core) freqRef = 100000000;
+  } else if(src == SERCOM_CLOCK_SOURCE_32K) {
+    GCLK->PCHCTRL[clk_id].reg =
+      GCLK_PCHCTRL_GEN_GCLK3_Val | (1 << GCLK_PCHCTRL_CHEN_Pos);
+    if(core) freqRef = 32768;
+  } else if(src == SERCOM_CLOCK_SOURCE_12M) {
+    GCLK->PCHCTRL[clk_id].reg =
+      GCLK_PCHCTRL_GEN_GCLK4_Val | (1 << GCLK_PCHCTRL_CHEN_Pos);
+    if(core) freqRef = 12000000;
+  }
+
+  while(!GCLK->PCHCTRL[clk_id].bit.CHEN); // Wait for clock enable
+}
+#endif
 
 void SERCOM::initClockNVIC( void )
 {
+  int8_t idx = getSercomIndex();
+  if(idx < 0) return; // We got a problem here
 
 #if defined(__SAMD51__)
-	uint32_t clk_core;
-	uint32_t clk_slow;
 
-	if(sercom == SERCOM0)
-	{
-		clk_core = SERCOM0_GCLK_ID_CORE;
-		clk_slow = SERCOM0_GCLK_ID_SLOW;
-
-    NVIC_ClearPendingIRQ(SERCOM0_0_IRQn);
-    NVIC_ClearPendingIRQ(SERCOM0_1_IRQn);
-    NVIC_ClearPendingIRQ(SERCOM0_2_IRQn);
-    NVIC_ClearPendingIRQ(SERCOM0_3_IRQn);
-
-    NVIC_SetPriority (SERCOM0_0_IRQn, (1<<__NVIC_PRIO_BITS) - 1);  /* set Priority */
-    NVIC_SetPriority (SERCOM0_1_IRQn, (1<<__NVIC_PRIO_BITS) - 1); 
-    NVIC_SetPriority (SERCOM0_2_IRQn, (1<<__NVIC_PRIO_BITS) - 1); 
-    NVIC_SetPriority (SERCOM0_3_IRQn, (1<<__NVIC_PRIO_BITS) - 1);
-
-    NVIC_EnableIRQ(SERCOM0_0_IRQn);
-    NVIC_EnableIRQ(SERCOM0_1_IRQn);
-    NVIC_EnableIRQ(SERCOM0_2_IRQn);
-    NVIC_EnableIRQ(SERCOM0_3_IRQn);
+  for(uint8_t i=0; i<4; i++) {
+    NVIC_ClearPendingIRQ(sercomData[idx].irq[i]);
+    NVIC_SetPriority(sercomData[idx].irq[i], SERCOM_NVIC_PRIORITY);
+    NVIC_EnableIRQ(sercomData[idx].irq[i]);
   }
-	else if(sercom == SERCOM1)
-	{
-		clk_core = SERCOM1_GCLK_ID_CORE;
-		clk_slow = SERCOM1_GCLK_ID_SLOW;
 
-    NVIC_ClearPendingIRQ(SERCOM1_0_IRQn);
-    NVIC_ClearPendingIRQ(SERCOM1_1_IRQn);
-    NVIC_ClearPendingIRQ(SERCOM1_2_IRQn);
-    NVIC_ClearPendingIRQ(SERCOM1_3_IRQn);
+  // SPI DMA speed is dictated by the "slow clock" (I think...maybe) so
+  // BOTH are set to the same clock source (clk_slow isn't sourced from
+  // XOSC32K as in prior versions of SAMD core).
+  // This might have power implications for sleep code.
 
-    NVIC_SetPriority (SERCOM1_0_IRQn, (1<<__NVIC_PRIO_BITS) - 1);  /* set Priority */
-    NVIC_SetPriority (SERCOM1_1_IRQn, (1<<__NVIC_PRIO_BITS) - 1); 
-    NVIC_SetPriority (SERCOM1_2_IRQn, (1<<__NVIC_PRIO_BITS) - 1); 
-    NVIC_SetPriority (SERCOM1_3_IRQn, (1<<__NVIC_PRIO_BITS) - 1);
+  setClockSource(idx, clockSource, true);  // true  = core clock
+  setClockSource(idx, clockSource, false); // false = slow clock
 
-    NVIC_EnableIRQ(SERCOM1_0_IRQn);
-    NVIC_EnableIRQ(SERCOM1_1_IRQn);
-    NVIC_EnableIRQ(SERCOM1_2_IRQn);
-    NVIC_EnableIRQ(SERCOM1_3_IRQn);
-	}
-	else if(sercom == SERCOM2)
-	{
-		clk_core = SERCOM2_GCLK_ID_CORE;
-		clk_slow = SERCOM2_GCLK_ID_SLOW;
+#else // end if SAMD51 (prob SAMD21)
 
-    NVIC_ClearPendingIRQ(SERCOM2_0_IRQn);
-    NVIC_ClearPendingIRQ(SERCOM2_1_IRQn);
-    NVIC_ClearPendingIRQ(SERCOM2_2_IRQn);
-    NVIC_ClearPendingIRQ(SERCOM2_3_IRQn);
+  uint8_t   clockId = sercomData[idx].clock;
+  IRQn_Type IdNvic  = sercomData[idx].irqn;
 
-    NVIC_SetPriority (SERCOM2_0_IRQn, (1<<__NVIC_PRIO_BITS) - 1);  /* set Priority */
-    NVIC_SetPriority (SERCOM2_1_IRQn, (1<<__NVIC_PRIO_BITS) - 1); 
-    NVIC_SetPriority (SERCOM2_2_IRQn, (1<<__NVIC_PRIO_BITS) - 1); 
-    NVIC_SetPriority (SERCOM2_3_IRQn, (1<<__NVIC_PRIO_BITS) - 1);
-
-    NVIC_EnableIRQ(SERCOM2_0_IRQn);
-    NVIC_EnableIRQ(SERCOM2_1_IRQn);
-    NVIC_EnableIRQ(SERCOM2_2_IRQn);
-    NVIC_EnableIRQ(SERCOM2_3_IRQn);
-	}
-	else if(sercom == SERCOM3)
-	{
-		clk_core = SERCOM3_GCLK_ID_CORE;
-		clk_slow = SERCOM3_GCLK_ID_SLOW;
-
-    NVIC_ClearPendingIRQ(SERCOM3_0_IRQn);
-    NVIC_ClearPendingIRQ(SERCOM3_1_IRQn);
-    NVIC_ClearPendingIRQ(SERCOM3_2_IRQn);
-    NVIC_ClearPendingIRQ(SERCOM3_3_IRQn);
-
-    NVIC_SetPriority (SERCOM3_0_IRQn, (1<<__NVIC_PRIO_BITS) - 1);  /* set Priority */
-    NVIC_SetPriority (SERCOM3_1_IRQn, (1<<__NVIC_PRIO_BITS) - 1); 
-    NVIC_SetPriority (SERCOM3_2_IRQn, (1<<__NVIC_PRIO_BITS) - 1); 
-    NVIC_SetPriority (SERCOM3_3_IRQn, (1<<__NVIC_PRIO_BITS) - 1);
-
-    NVIC_EnableIRQ(SERCOM3_0_IRQn);
-    NVIC_EnableIRQ(SERCOM3_1_IRQn);
-    NVIC_EnableIRQ(SERCOM3_2_IRQn);
-    NVIC_EnableIRQ(SERCOM3_3_IRQn);
-	}
-	else if(sercom == SERCOM4)
-	{
-		clk_core = SERCOM4_GCLK_ID_CORE;
-		clk_slow = SERCOM4_GCLK_ID_SLOW;
-
-    NVIC_ClearPendingIRQ(SERCOM4_0_IRQn);
-    NVIC_ClearPendingIRQ(SERCOM4_1_IRQn);
-    NVIC_ClearPendingIRQ(SERCOM4_2_IRQn);
-    NVIC_ClearPendingIRQ(SERCOM4_3_IRQn);
-
-    NVIC_SetPriority (SERCOM4_0_IRQn, (1<<__NVIC_PRIO_BITS) - 1);  /* set Priority */
-    NVIC_SetPriority (SERCOM4_1_IRQn, (1<<__NVIC_PRIO_BITS) - 1); 
-    NVIC_SetPriority (SERCOM4_2_IRQn, (1<<__NVIC_PRIO_BITS) - 1); 
-    NVIC_SetPriority (SERCOM4_3_IRQn, (1<<__NVIC_PRIO_BITS) - 1);
-
-    NVIC_EnableIRQ(SERCOM4_0_IRQn);
-    NVIC_EnableIRQ(SERCOM4_1_IRQn);
-    NVIC_EnableIRQ(SERCOM4_2_IRQn);
-    NVIC_EnableIRQ(SERCOM4_3_IRQn);
-	}
-	else if(sercom == SERCOM5)
-	{
-		clk_core = SERCOM5_GCLK_ID_CORE;
-		clk_slow = SERCOM5_GCLK_ID_SLOW;
-
-    NVIC_ClearPendingIRQ(SERCOM5_0_IRQn);
-    NVIC_ClearPendingIRQ(SERCOM5_1_IRQn);
-    NVIC_ClearPendingIRQ(SERCOM5_2_IRQn);
-    NVIC_ClearPendingIRQ(SERCOM5_3_IRQn);
-
-    NVIC_SetPriority (SERCOM5_0_IRQn, (1<<__NVIC_PRIO_BITS) - 1);  /* set Priority */
-    NVIC_SetPriority (SERCOM5_1_IRQn, (1<<__NVIC_PRIO_BITS) - 1); 
-    NVIC_SetPriority (SERCOM5_2_IRQn, (1<<__NVIC_PRIO_BITS) - 1); 
-    NVIC_SetPriority (SERCOM5_3_IRQn, (1<<__NVIC_PRIO_BITS) - 1);
-
-    NVIC_EnableIRQ(SERCOM5_0_IRQn);
-    NVIC_EnableIRQ(SERCOM5_1_IRQn);
-    NVIC_EnableIRQ(SERCOM5_2_IRQn);
-    NVIC_EnableIRQ(SERCOM5_3_IRQn);
-	}
-#else
-
-  IRQn_Type IdNvic=PendSV_IRQn ; // Dummy init to intercept potential error later
-
-  uint8_t clockId = 0;
-  if(sercom == SERCOM0)
-  {
-    clockId = GCM_SERCOM0_CORE;
-    IdNvic = SERCOM0_IRQn;
-  }
-  else if(sercom == SERCOM1)
-  {
-    clockId = GCM_SERCOM1_CORE;
-    IdNvic = SERCOM1_IRQn;
-  }
-  else if(sercom == SERCOM2)
-  {
-    clockId = GCM_SERCOM2_CORE;
-    IdNvic = SERCOM2_IRQn;
-  }
-  else if(sercom == SERCOM3)
-  {
-    clockId = GCM_SERCOM3_CORE;
-    IdNvic = SERCOM3_IRQn;
-  }
-#if defined(SERCOM4)
-  else if(sercom == SERCOM4)
-  {
-    clockId = GCM_SERCOM4_CORE;
-    IdNvic = SERCOM4_IRQn;
-  }
-#endif
-#if defined(SERCOM5)
-  else if(sercom == SERCOM5)
-  {
-    clockId = GCM_SERCOM5_CORE;
-    IdNvic = SERCOM5_IRQn;
-  }
-#endif
-
-  if ( IdNvic == PendSV_IRQn )
-  {
-    // We got a problem here
-    return ;
-  }
-#endif
-
-#if defined(__SAMD51__)
-  GCLK->PCHCTRL[clk_core].reg = GCLK_PCHCTRL_GEN_GCLK1_Val | (1 << GCLK_PCHCTRL_CHEN_Pos);
-  GCLK->PCHCTRL[clk_slow].reg = GCLK_PCHCTRL_GEN_GCLK3_Val | (1 << GCLK_PCHCTRL_CHEN_Pos);
-  
-#else
   // Setting NVIC
   NVIC_ClearPendingIRQ(IdNvic);
-  NVIC_SetPriority (IdNvic, (1<<__NVIC_PRIO_BITS) - 1);  /* set Priority */
+  NVIC_SetPriority(IdNvic, SERCOM_NVIC_PRIORITY);
   NVIC_EnableIRQ(IdNvic);
 
   // Setting clock
-  GCLK->CLKCTRL.reg = GCLK_CLKCTRL_ID( clockId ) | // Generic Clock 0 (SERCOMx)
+  GCLK->CLKCTRL.reg =
+    GCLK_CLKCTRL_ID( clockId ) | // Generic Clock 0 (SERCOMx)
     GCLK_CLKCTRL_GEN_GCLK0     | // Generic Clock Generator 0 is source
     GCLK_CLKCTRL_CLKEN;
 
-  while ( GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY )
-  {
-    /* Wait for synchronization */
-  }
-#endif
+  while(GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY); // Wait for synchronization
+
+#endif // end !SAMD51
 }

cores/arduino/SERCOM.h

@@ -21,6 +21,17 @@
 
 #include "sam.h"
 
+// SAMD51 has configurable MAX_SPI, else use peripheral clock default.
+// Update: changing MAX_SPI via compiler flags is DEPRECATED, because
+// this affects ALL SPI peripherals including some that should NOT be
+// changed (e.g. anything using SD card). Instead, use setClockSource().
+// This is left here for compatibility w/interim MAX_SPI-dependent code:
+#if defined(MAX_SPI)
+  #define SERCOM_SPI_FREQ_REF (MAX_SPI * 2)
+#else
+  #define SERCOM_SPI_FREQ_REF 48000000ul
+#endif
+// Other SERCOM peripherals always use the 48 MHz clock
 #define SERCOM_FREQ_REF       48000000ul
 #define SERCOM_NVIC_PRIORITY  ((1<<__NVIC_PRIO_BITS) - 1)
 
@@ -141,6 +152,19 @@ typedef enum
 	WIRE_MASTER_NACK_ACTION
 } SercomMasterAckActionWire;
 
+// SERCOM clock source override is available only on SAMD51 (not 21)
+// but the enumeration is made regardless so user code doesn't need
+// ifdefs or lengthy comments explaining the different situations --
+// the clock-sourcing functions just compile to nothing on SAMD21.
+typedef enum {
+  SERCOM_CLOCK_SOURCE_FCPU,     // F_CPU clock (GCLK0)
+  SERCOM_CLOCK_SOURCE_48M,      // 48 MHz peripheral clock (GCLK1) (standard)
+  SERCOM_CLOCK_SOURCE_100M,     // 100 MHz peripheral clock (GCLK2)
+  SERCOM_CLOCK_SOURCE_32K,      // XOSC32K clock (GCLK3)
+  SERCOM_CLOCK_SOURCE_12M,      // 12 MHz peripheral clock (GCLK4)
+  SERCOM_CLOCK_SOURCE_NO_CHANGE // Leave clock source setting unchanged
+} SercomClockSource;
+
 class SERCOM
 {
 	public:
@@ -171,7 +195,6 @@ class SERCOM
 		/* ========== SPI ========== */
 		void initSPI(SercomSpiTXPad mosi, SercomRXPad miso, SercomSpiCharSize charSize, SercomDataOrder dataOrder) ;
 		void initSPIClock(SercomSpiClockMode clockMode, uint32_t baudrate) ;
-
 		void resetSPI( void ) ;
 		void enableSPI( void ) ;
 		void disableSPI( void ) ;
@@ -202,6 +225,9 @@ class SERCOM
 		bool isSlaveWIRE( void ) ;
 		bool isBusIdleWIRE( void ) ;
 		bool isBusOwnerWIRE( void ) ;
+		bool isBusUnknownWIRE( void ) ;
+		bool isArbLostWIRE( void );
+		bool isBusBusyWIRE( void );
 		bool isDataReadyWIRE( void ) ;
 		bool isStopDetectedWIRE( void ) ;
 		bool isRestartDetectedWIRE( void ) ;
@@ -210,9 +236,29 @@ class SERCOM
     bool isRXNackReceivedWIRE( void ) ;
 		int availableWIRE( void ) ;
 		uint8_t readDataWIRE( void ) ;
+		int8_t getSercomIndex(void);
+#if defined(__SAMD51__)
+		// SERCOM clock source override is only available on
+		// SAMD51 (not 21) ... but these functions are declared
+		// regardless so user code doesn't need ifdefs or lengthy
+		// comments explaining the different situations -- these
+		// just compile to nothing on SAMD21.
+		void setClockSource(int8_t idx, SercomClockSource src, bool core);
+		SercomClockSource getClockSource(void) { return clockSource; };
+		uint32_t getFreqRef(void) { return freqRef; };
+#else
+		// The equivalent SAMD21 dummy functions...
+		void setClockSource(int8_t idx, SercomClockSource src, bool core) { (void)idx; (void)src; (void)core; };
+		SercomClockSource getClockSource(void) { return SERCOM_CLOCK_SOURCE_FCPU; };
+		uint32_t getFreqRef(void) { return F_CPU; };
+#endif
 
 	private:
 		Sercom* sercom;
+#if defined(__SAMD51__)
+                SercomClockSource clockSource;
+                uint32_t freqRef; // Frequency corresponding to clockSource
+#endif
 		uint8_t calculateBaudrateSynchronous(uint32_t baudrate);
 		uint32_t division(uint32_t dividend, uint32_t divisor) ;
 		void initClockNVIC( void ) ;

cores/arduino/Stream.cpp

@@ -35,6 +35,7 @@ int Stream::timedRead()
   do {
     c = read();
     if (c >= 0) return c;
+    yield(); // running TinyUSB task
   } while(millis() - _startMillis < _timeout);
   return -1;     // -1 indicates timeout
 }
@@ -47,6 +48,7 @@ int Stream::timedPeek()
   do {
     c = peek();
     if (c >= 0) return c;
+    yield(); // running TinyUSB task
   } while(millis() - _startMillis < _timeout);
   return -1;     // -1 indicates timeout
 }

cores/arduino/Tone.cpp

@@ -20,12 +20,6 @@
 #include "Tone.h"
 #include "variant.h"
 
-#if defined(__SAMD51__) 
-#define WAIT_TC16_REGS_SYNC(x) while(x->COUNT16.SYNCBUSY.bit.ENABLE);
-#else
-#define WAIT_TC16_REGS_SYNC(x) while(x->COUNT16.STATUS.bit.SYNCBUSY);
-#endif
-
 uint32_t toneMaxFrequency = F_CPU / 2;
 uint32_t lastOutputPin = 0xFFFFFFFF;
 
@@ -37,22 +31,24 @@ volatile bool toneIsActive = false;
 volatile bool firstTimeRunning = false;
 
 #if defined(__SAMD51__)
-#define TONE_TC         TC2
-#define TONE_TC_IRQn    TC2_IRQn
-#define TONE_TC_GCLK_ID	TC2_GCLK_ID
+  #define TONE_TC         TC0
+  #define TONE_TC_IRQn    TC0_IRQn
+  #define TONE_TC_GCLK_ID	TC0_GCLK_ID
+  #define Tone_Handler    TC0_Handler
+
+  #define WAIT_TC16_REGS_SYNC(x) while(x->COUNT16.SYNCBUSY.bit.ENABLE);
+
 #else
   #define TONE_TC         TC5
   #define TONE_TC_IRQn    TC5_IRQn
+  #define Tone_Handler    TC5_Handler
+
+  #define WAIT_TC16_REGS_SYNC(x) while(x->COUNT16.STATUS.bit.SYNCBUSY);
 #endif
+
 #define TONE_TC_TOP     0xFFFF
 #define TONE_TC_CHANNEL 0
 
-#if defined(__SAMD51__)
-void TC2_Handler (void) __attribute__ ((weak, alias("Tone_Handler")));
-#else
-void TC5_Handler (void) __attribute__ ((weak, alias("Tone_Handler")));
-#endif
-
 static inline void resetTC (Tc* TCx)
 {
   // Disable TCx
@@ -72,6 +68,14 @@ void toneAccurateClock (uint32_t accurateSystemCoreClockFrequency)
 
 void tone (uint32_t outputPin, uint32_t frequency, uint32_t duration)
 {
+
+  // Avoid divide by zero error by calling 'noTone' instead
+  if (frequency == 0)
+  {
+    noTone(outputPin);
+    return;
+  }
+
   // Configure interrupt request
   NVIC_DisableIRQ(TONE_TC_IRQn);
   NVIC_ClearPendingIRQ(TONE_TC_IRQn);
@@ -80,7 +84,7 @@ void tone (uint32_t outputPin, uint32_t frequency, uint32_t duration)
   {
     firstTimeRunning = true;
     
-    NVIC_SetPriority(TONE_TC_IRQn, 0);
+    NVIC_SetPriority(TONE_TC_IRQn, 5);
 
 #if defined(__SAMD51__)
     GCLK->PCHCTRL[TONE_TC_GCLK_ID].reg = GCLK_PCHCTRL_GEN_GCLK0_Val | (1 << GCLK_PCHCTRL_CHEN_Pos);
@@ -91,9 +95,6 @@ void tone (uint32_t outputPin, uint32_t frequency, uint32_t duration)
 #endif
   }
   
-  //if it's a rest, set to 1Hz (below audio range)
-  frequency = (frequency > 0 ? frequency : 1);
-  
   if (toneIsActive && (outputPin != lastOutputPin))
     noTone(lastOutputPin);
 
@@ -136,7 +137,7 @@ void tone (uint32_t outputPin, uint32_t frequency, uint32_t duration)
     default: break;
   }
 
-  toggleCount = (duration > 0 ? frequency * duration * 2 / 1000UL : -1);
+  toggleCount = (duration > 0 ? frequency * duration * 2 / 1000UL : -1LL);
 
   resetTC(TONE_TC);
 
@@ -178,11 +179,21 @@ void tone (uint32_t outputPin, uint32_t frequency, uint32_t duration)
 }
 
 void noTone (uint32_t outputPin)
+{
+  /* 'tone' need to run at least once in order to enable GCLK for
+   * the timers used for the tone-functionality. If 'noTone' is called
+   * without ever calling 'tone' before then 'WAIT_TC16_REGS_SYNC(TCx)'
+   * will wait infinitely. The variable 'firstTimeRunning' is set the
+   * 1st time 'tone' is set so it can be used to detect wether or not
+   * 'tone' has been called before.
+   */
+  if(firstTimeRunning)
   {
     resetTC(TONE_TC);
     digitalWrite(outputPin, LOW);
     toneIsActive = false;
   }
+}
 
 #ifdef __cplusplus
 extern "C" {

cores/arduino/USB/CDC.cpp

@@ -16,6 +16,8 @@
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
 
+#ifndef USE_TINYUSB
+
 #include <Arduino.h>
 #include <Reset.h> // Needed for auto-reset with 1200bps port touch
 
@@ -150,6 +152,7 @@ void Serial_::begin(uint32_t /* baud_count */, uint8_t /* config */)
 
 void Serial_::end(void)
 {
+	memset((void*)&_usbLineInfo, 0, sizeof(_usbLineInfo));
 }
 
 int Serial_::available(void)
@@ -256,6 +259,52 @@ Serial_::operator bool()
 	return result;
 }
 
+int32_t Serial_::readBreak() {
+	uint8_t enableInterrupts = ((__get_PRIMASK() & 0x1) == 0);
+
+	// disable interrupts,
+	// to avoid clearing a breakValue that might occur 
+	// while processing the current break value
+	__disable_irq();
+
+	int32_t ret = breakValue;
+
+	breakValue = -1;
+
+	if (enableInterrupts) {
+		// re-enable the interrupts
+		__enable_irq();
+	}
+
+	return ret;
+}
+
+unsigned long Serial_::baud() {
+	return _usbLineInfo.dwDTERate;
+}
+
+uint8_t Serial_::stopbits() {
+	return _usbLineInfo.bCharFormat;
+}
+
+uint8_t Serial_::paritytype() {
+	return _usbLineInfo.bParityType;
+}
+
+uint8_t Serial_::numbits() {
+	return _usbLineInfo.bDataBits;
+}
+
+bool Serial_::dtr() {
+	return _usbLineInfo.lineState & 0x1;
+}
+
+bool Serial_::rts() {
+	return _usbLineInfo.lineState & 0x2;
+}
+
 Serial_ Serial(USBDevice);
 
 #endif
+
+#endif // USE_TINYUSB

cores/arduino/USB/PluggableUSB.cpp

@@ -17,6 +17,8 @@
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
 
+#ifndef USE_TINYUSB
+
 #include "USBAPI.h"
 #include "USBDesc.h"
 #include "USBCore.h"
@@ -114,3 +116,5 @@ PluggableUSB_::PluggableUSB_() : lastIf(CDC_ACM_INTERFACE + CDC_INTERFACE_COUNT)
 
 #endif
 #endif
+
+#endif // USE_TINYUSB

cores/arduino/USB/SAMD21_USBDevice.cpp

@@ -5,6 +5,7 @@
  *      Author: deanm
  */
 
+#ifndef USE_TINYUSB
 
 #include "SAMD21_USBDevice.h"
 
@@ -36,3 +37,5 @@ void USBDevice_SAMD21G18x::calibrate() {
     usb.PADCAL.bit.TRANSP = pad_transp;
     usb.PADCAL.bit.TRIM   = pad_trim;
 }
+
+#endif // USE_TINYUSB

cores/arduino/USB/SAMD21_USBDevice.h

@@ -237,7 +237,7 @@ public:
 		release();
 	}
 
-	~DoubleBufferedEPOutHandler() {
+	virtual ~DoubleBufferedEPOutHandler() {
 		free((void*)data0);
 		free((void*)data1);
 	}

cores/arduino/USB/USBAPI.h

@@ -65,6 +65,7 @@ public:
 
 	// USB Device API
 	void init();
+	bool end();
 	bool attach();
 	bool detach();
 	void setAddress(uint32_t addr);
@@ -84,7 +85,7 @@ public:
 	uint32_t sendControl(int /* ep */, const void *data, uint32_t len) { return sendControl(data, len); }
 	uint32_t recvControl(void *data, uint32_t len);
 	uint32_t sendConfiguration(uint32_t maxlen);
-	bool sendStringDescriptor(const uint8_t *string, uint8_t maxlen);
+	bool sendStringDescriptor(const uint8_t *string, uint32_t maxlen);
 	void initControl(int end);
 	uint8_t SendInterfaces(uint32_t* total);
 	void packMessages(bool val);

cores/arduino/USB/USBCore.cpp

@@ -16,7 +16,7 @@
   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 USE_TINYUSB
 #if defined(USBCON)
 
 #include <Arduino.h>
@@ -110,12 +110,12 @@ static EPHandler *epHandlers[7] = {NULL, NULL, NULL, NULL, NULL, NULL, NULL};
 // Send a USB descriptor string. The string is stored as a
 // plain ASCII string but is sent out as UTF-16 with the
 // correct 2-byte prefix
-bool USBDeviceClass::sendStringDescriptor(const uint8_t *string, uint8_t maxlen)
+bool USBDeviceClass::sendStringDescriptor(const uint8_t *string, uint32_t maxlen)
 {
 	if (maxlen < 2)
 		return false;
 
-	uint8_t buffer[maxlen];
+	uint8_t* buffer = (uint8_t*)malloc(maxlen);
 	buffer[0] = strlen((const char*)string) * 2 + 2;
 	buffer[1] = 0x03;
 
@@ -126,7 +126,9 @@ bool USBDeviceClass::sendStringDescriptor(const uint8_t *string, uint8_t maxlen)
 		buffer[i] = 0;
 	}
 
-	return USBDevice.sendControl(buffer, i);
+	bool ret = USBDevice.sendControl(buffer, i);
+	free(buffer);
+	return ret;
 }
 
 bool _dry_run = false;
@@ -244,26 +246,25 @@ bool USBDeviceClass::sendDescriptor(USBSetup &setup)
 		}
 		else if (setup.wValueL == ISERIAL) {
 #ifdef PLUGGABLE_USB_ENABLED
-#if defined(__SAMD51__)
-			char name[ISERIAL_MAX_LEN];
-			PluggableUSB().getShortName(name);
-			return sendStringDescriptor((uint8_t*)name, setup.wLength);
-#else
+#ifdef __SAMD51__
+			#define SERIAL_NUMBER_WORD_0	*(volatile uint32_t*)(0x008061FC)
+			#define SERIAL_NUMBER_WORD_1	*(volatile uint32_t*)(0x00806010)
+			#define SERIAL_NUMBER_WORD_2	*(volatile uint32_t*)(0x00806014)
+			#define SERIAL_NUMBER_WORD_3	*(volatile uint32_t*)(0x00806018)
+#else // samd21
 			// from section 9.3.3 of the datasheet
 			#define SERIAL_NUMBER_WORD_0	*(volatile uint32_t*)(0x0080A00C)
 			#define SERIAL_NUMBER_WORD_1	*(volatile uint32_t*)(0x0080A040)
 			#define SERIAL_NUMBER_WORD_2	*(volatile uint32_t*)(0x0080A044)
 			#define SERIAL_NUMBER_WORD_3	*(volatile uint32_t*)(0x0080A048)
-
+#endif
 			char name[ISERIAL_MAX_LEN];
 			utox8(SERIAL_NUMBER_WORD_0, &name[0]);
 			utox8(SERIAL_NUMBER_WORD_1, &name[8]);
 			utox8(SERIAL_NUMBER_WORD_2, &name[16]);
 			utox8(SERIAL_NUMBER_WORD_3, &name[24]);
-
-			PluggableUSB().getShortName(&name[32]);
+			name[32] = '\0';
 			return sendStringDescriptor((uint8_t*)name, setup.wLength);
-#endif
 #endif
 		}
 		else {
@@ -434,6 +435,13 @@ bool USBDeviceClass::detach()
 	return true;
 }
 
+bool USBDeviceClass::end() {
+	if (!initialized)
+		return false;
+	usbd.disable();
+	return true;
+}
+
 bool USBDeviceClass::configured()
 {
 	return _usbConfiguration != 0;
@@ -871,6 +879,7 @@ bool USBDeviceClass::handleStandardSetup(USBSetup &setup)
 			sendZlp(0);
 			return true;
 		}
+		return false;
 
 	case SET_ADDRESS:
 		setAddress(setup.wValueL);
@@ -1032,3 +1041,4 @@ void USBDeviceClass::ISRHandler()
 USBDeviceClass USBDevice;
 
 #endif
+#endif // USE_TINYUSB

cores/arduino/USB/USBCore.h

@@ -101,7 +101,7 @@
 // bMaxPower in Configuration Descriptor
 #define USB_CONFIG_POWER_MA(mA)                ((mA)/2)
 #ifndef USB_CONFIG_POWER
- #define USB_CONFIG_POWER                      (500)
+ #define USB_CONFIG_POWER                      (100)
 #endif
 
 #define CDC_V1_10                               0x0110

cores/arduino/USB/samd21_host.c

@@ -17,6 +17,7 @@
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
 
+#ifndef USE_TINYUSB
 
 #include <stdio.h>
 #include <stdint.h>
@@ -63,7 +64,6 @@ void UHD_Init(void)
 	uint32_t pad_transn;
 	uint32_t pad_transp;
 	uint32_t pad_trim;
-	uint32_t i;
 
 	USB_SetHandler(&UHD_Handler);
 
@@ -172,10 +172,7 @@ void UHD_Init(void)
 	USB->HOST.DESCADD.reg = (uint32_t)(&usb_pipe_table[0]);
 	// For USB_SPEED_FULL
 	uhd_force_full_speed();
-	for (i = 0; i < sizeof(usb_pipe_table); i++)
-	{
-		(*(uint32_t *)(&usb_pipe_table[0] + i)) = 0;
-	}
+	memset((void *)usb_pipe_table, 0, sizeof(usb_pipe_table));
 
 	uhd_state = UHD_STATE_NO_VBUS;
 
@@ -557,3 +554,5 @@ uint32_t UHD_Pipe_Is_Transfer_Complete(uint32_t ul_pipe, uint32_t ul_token_type)
 // }
 
 #endif //  HOST_DEFINED
+
+#endif // USE_TINYUSB

cores/arduino/WInterrupts.c

@@ -93,31 +93,19 @@ void attachInterrupt(uint32_t pin, voidFuncPtr callback, uint32_t mode)
 		__initialize();
 		enabled = 1;
 	}
+	uint32_t inMask = (1UL << in);
+	// Enable wakeup capability on pin in case being used during sleep
+	#if defined(__SAMD51__)
+	//I believe this is done automatically
+	#else
+	EIC->WAKEUP.reg |= (1 << in);
+	#endif
 
 	// Only store when there is really an ISR to call.
 	// This allow for calling attachInterrupt(pin, NULL, mode), we set up all needed register
 	// but won't service the interrupt, this way we also don't need to check it inside the ISR.
 	if (callback)
 	{
-    // Store interrupts to service in order of when they were attached
-    // to allow for first come first serve handler
-    uint32_t current = 0;
-    uint32_t inMask = (1UL << in);
-
-    // Check if we already have this interrupt
-    for (current=0; current<nints; current++) {
-      if (ISRlist[current] == inMask) {
-        break;
-      }
-    }
-    if (current == nints) {
-      // Need to make a new entry
-      nints++;
-    }
-    ISRlist[current] = inMask;       // List of interrupt in order of when they were attached
-    ISRcallback[current] = callback; // List of callback adresses
-  }
-
 		if (in == EXTERNAL_INT_NMI) {
 			EIC->NMIFLAG.bit.NMI = 1; // Clear flag
 			switch (mode) {
@@ -147,34 +135,41 @@ void attachInterrupt(uint32_t pin, voidFuncPtr callback, uint32_t mode)
 
 		} else { // Not NMI, is external interrupt
 
-    // Enable wakeup capability on pin in case being used during sleep
-#if defined(__SAMD51__)
-//I believe this is done automatically
-#else
-    EIC->WAKEUP.reg |= (1 << in);
-#endif
-
 			// Assign pin to EIC
 			pinPeripheral(pin, PIO_EXTINT);
 
-    // Assign callback to interrupt
-    ISRcallback[in] = callback;
+			// Store interrupts to service in order of when they were attached
+			// to allow for first come first serve handler
+			uint32_t current = 0;
+
+			// Check if we already have this interrupt
+			for (current=0; current<nints; current++) {
+			  if (ISRlist[current] == inMask) {
+				break;
+			  }
+			}
+			if (current == nints) {
+			  // Need to make a new entry
+			  nints++;
+			}
+			ISRlist[current] = inMask;       // List of interrupt in order of when they were attached
+			ISRcallback[current] = callback; // List of callback adresses
 
 			// Look for right CONFIG register to be addressed
 			if (in > EXTERNAL_INT_7) {
 			  config = 1;
+			  pos = (in - 8) << 2;
 			} else {
 			  config = 0;
+			  pos = in << 2;
 			}
 
-    // Configure the interrupt mode
-    pos = (in - (8 * config)) << 2;
-
 			#if defined (__SAMD51__)
 			EIC->CTRLA.bit.ENABLE = 0;
 			while (EIC->SYNCBUSY.bit.ENABLE == 1) { }
 			#endif
 
+			EIC->CONFIG[config].reg &=~ (EIC_CONFIG_SENSE0_Msk << pos); // Reset sense mode, important when changing trigger mode during runtime
 			switch (mode)
 			{
 			  case LOW:
@@ -200,6 +195,7 @@ void attachInterrupt(uint32_t pin, voidFuncPtr callback, uint32_t mode)
 		}
 		// Enable the interrupt
 		EIC->INTENSET.reg = EIC_INTENSET_EXTINT(1 << in);
+	}
 
 	#if defined (__SAMD51__)
 	EIC->CTRLA.bit.ENABLE = 1;
@@ -254,17 +250,22 @@ void detachInterrupt(uint32_t pin)
  * External Interrupt Controller NVIC Interrupt Handler
  */
 #if defined(__SAMD51__)
-void InterruptHandler(uint32_t i)
+void InterruptHandler(uint32_t unused_i)
 {
-  if ((EIC->INTFLAG.reg & (1 << i)) != 0)
-  {
-    // Call the callback function if assigned
-    if (ISRcallback[i]) {
-      ISRcallback[i]();
-    }
+  (void)unused_i;
+  // Calling the routine directly from -here- takes about 1us
+  // Depending on where you are in the list it will take longer
 
+  // Loop over all enabled interrupts in the list
+  for (uint32_t i=0; i<nints; i++)
+  {
+	if ((EIC->INTFLAG.reg & ISRlist[i]) != 0)
+	{
+	  // Call the callback function
+	  ISRcallback[i]();
 	  // Clear the interrupt
-    EIC->INTFLAG.reg = 1 << i;
+	  EIC->INTFLAG.reg = ISRlist[i];
+	}
   }
 }
 

cores/arduino/WInterrupts.h

@@ -31,7 +31,7 @@ extern "C" {
 #define FALLING 3
 #define RISING 4
 
-#define DEFAULT 1
+//#define DEFAULT 1
 #define EXTERNAL 0
 
 typedef void (*voidFuncPtr)(void);

cores/arduino/WString.cpp

@@ -693,12 +693,21 @@ void String::remove(unsigned int index){
 }
 
 void String::remove(unsigned int index, unsigned int count){
-	if (index >= len) { return; }
-	if (count <= 0) { return; }
-	if (count > len - index) { count = len - index; }
+	// removes characters from the middle of a string.
+	if (count <= 0) { return; }   // exit if nothing to remove
+	if (index >= len) { return; } // ensure start is within string length; thus, ensures (len-index >= 1)
+	if (count > len - index) {    // ensure characters to remove is no larger than total length remaining
+		count = len - index;
+	}
 	char *writeTo  = buffer + index;
+	char *copyFrom = buffer + index + count;
 	len = len - count;
-	strncpy(writeTo, buffer + index + count,len - index);
+	
+	// strncpy() cannot be used with overlapping buffers, so copy one char at a time
+	unsigned int charactersToMove = len - index; // yes, uses post-adjusted length
+	for (unsigned int i = 0; i < charactersToMove; i++, writeTo++, copyFrom++) {
+		*writeTo = *copyFrom;
+	}
 	buffer[len] = 0;
 }
 

cores/arduino/WVariant.h

@@ -57,10 +57,41 @@ typedef enum _EAnalogChannel
   ADC_Channel19=19,
   DAC_Channel0,
   DAC_Channel1,
+  ADC_Channel_Bandgap=0x1B,
+  ADC_Channel_PTAT=0x1C,
 } EAnalogChannel ;
 
 #if defined(__SAMD51__)
 
+#if defined(__SAMD51G19A__)
+
+typedef enum _ETCChannel
+{
+  NOT_ON_TIMER=-1,
+  TCC0_CH0 = (0<<8)|(0),
+  TCC0_CH1 = (0<<8)|(1),
+  TCC0_CH2 = (0<<8)|(2),
+  TCC0_CH3 = (0<<8)|(3),
+  TCC0_CH4 = (0<<8)|(4),
+  TCC0_CH5 = (0<<8)|(5),
+  TCC1_CH0 = (1<<8)|(0),
+  TCC1_CH1 = (1<<8)|(1),
+  TCC1_CH2 = (1<<8)|(2),
+  TCC1_CH3 = (1<<8)|(3),
+  TCC2_CH0 = (2<<8)|(0),
+  TCC2_CH1 = (2<<8)|(1),
+  TCC2_CH2 = (2<<8)|(2),
+  TC0_CH0 =  (3<<8)|(0),
+  TC0_CH1 =  (3<<8)|(1),
+  TC1_CH0 =  (4<<8)|(0),
+  TC1_CH1 =  (4<<8)|(1),
+  TC2_CH0 =  (5<<8)|(0),
+  TC2_CH1 =  (5<<8)|(1),
+  TC3_CH0 =  (6<<8)|(0),
+  TC3_CH1 =  (6<<8)|(1),
+} ETCChannel ;
+#elif defined(__SAMD51J19A__) || defined(__SAMD51J20A__) || defined(__SAME51J19A__)
+
 typedef enum _ETCChannel
 {
   NOT_ON_TIMER=-1,
@@ -76,12 +107,82 @@ typedef enum _ETCChannel
   TCC1_CH1 = (1<<8)|(1),
   TCC1_CH2 = (1<<8)|(2),
   TCC1_CH3 = (1<<8)|(3),
-  TCC1_CH4 = (1<<8)|(0),
-  TCC1_CH5 = (1<<8)|(1),
-  TCC1_CH6 = (1<<8)|(2),
-  TCC1_CH7 = (1<<8)|(3),
+  TCC1_CH4 = (1<<8)|(4),
+  TCC1_CH5 = (1<<8)|(5),
+  TCC1_CH6 = (1<<8)|(6),
+  TCC1_CH7 = (1<<8)|(7),
+  TCC2_CH0 = (2<<8)|(0),
+  TCC2_CH1 = (2<<8)|(1),
+  TCC2_CH2 = (2<<8)|(2),
+  TCC3_CH0 = (3<<8)|(0),
+  TCC3_CH1 = (3<<8)|(1),
+  TCC4_CH0 = (4<<8)|(0),
+  TCC4_CH1 = (4<<8)|(1),
+  TC0_CH0 =  (5<<8)|(0),
+  TC0_CH1 =  (5<<8)|(1),
+  TC1_CH0 =  (6<<8)|(0),
+  TC1_CH1 =  (6<<8)|(1),
+  TC2_CH0 =  (7<<8)|(0),
+  TC2_CH1 =  (7<<8)|(1),
+  TC3_CH0 =  (8<<8)|(0),
+  TC3_CH1 =  (8<<8)|(1),
+  TC4_CH0 =  (9<<8)|(0),
+  TC4_CH1 =  (9<<8)|(1),
+  TC5_CH0 =  (10<<8)|(0),
+  TC5_CH1 =  (10<<8)|(1),
+  TC6_CH0 =  (11<<8)|(0),
+  TC6_CH1 =  (11<<8)|(1),
+  TC7_CH0 =  (12<<8)|(0),
+  TC7_CH1 =  (12<<8)|(1),
 } ETCChannel ;
 
+#elif defined(__SAME53N20A__) || defined(__SAME53N19A__) || defined(__SAME54P20A__) || defined(__SAME54P19A__) || defined(__SAME54N20A__) || defined(__SAME54N19A__) || defined(__SAMD51P20A__) || defined(__SAMD51P19A__) || defined(__SAMD51N20A__) || defined(__SAMD51N19A__) || defined(__SAME51N20A__) || defined(__SAME51N19A__)
+
+typedef enum _ETCChannel
+{
+  NOT_ON_TIMER=-1,
+  TCC0_CH0 = (0<<8)|(0),
+  TCC0_CH1 = (0<<8)|(1),
+  TCC0_CH2 = (0<<8)|(2),
+  TCC0_CH3 = (0<<8)|(3),
+  TCC0_CH4 = (0<<8)|(4),
+  TCC0_CH5 = (0<<8)|(5),
+  TCC1_CH0 = (1<<8)|(0),
+  TCC1_CH1 = (1<<8)|(1),
+  TCC1_CH2 = (1<<8)|(2),
+  TCC1_CH3 = (1<<8)|(3),
+  TCC2_CH0 = (2<<8)|(0),
+  TCC2_CH1 = (2<<8)|(1),
+  TCC2_CH2 = (2<<8)|(2),
+  TCC3_CH0 = (3<<8)|(0),
+  TCC3_CH1 = (3<<8)|(1),
+  TCC4_CH0 = (4<<8)|(0),
+  TCC4_CH1 = (4<<8)|(1),
+  TC0_CH0 =  (5<<8)|(0),
+  TC0_CH1 =  (5<<8)|(1),
+  TC1_CH0 =  (6<<8)|(0),
+  TC1_CH1 =  (6<<8)|(1),
+  TC2_CH0 =  (7<<8)|(0),
+  TC2_CH1 =  (7<<8)|(1),
+  TC3_CH0 =  (8<<8)|(0),
+  TC3_CH1 =  (8<<8)|(1),
+  TC4_CH0 =  (9<<8)|(0),
+  TC4_CH1 =  (9<<8)|(1),
+  TC5_CH0 =  (10<<8)|(0),
+  TC5_CH1 =  (10<<8)|(1),
+  TC6_CH0 =  (11<<8)|(0),
+  TC6_CH1 =  (11<<8)|(1),
+  TC7_CH0 =  (12<<8)|(0),
+  TC7_CH1 =  (12<<8)|(1),
+} ETCChannel ;
+
+#endif
+
+typedef ETCChannel EPWMChannel;
+extern const uint32_t GCLK_CLKCTRL_IDs[TCC_INST_NUM+TC_INST_NUM];
+
+#define NOT_ON_PWM NOT_ON_TIMER
+
 #else
 // Definitions for TC channels
 typedef enum _ETCChannel
@@ -109,40 +210,14 @@ typedef enum _ETCChannel
   TC4_CH1  = (4<<8)|(1),
   TC5_CH0  = (5<<8)|(0),
   TC5_CH1  = (5<<8)|(1),
+  #if defined (__SAMD21J18A__) 
+    TC6_CH0  = (6<<8)|(0),
+    TC6_CH1  = (6<<8)|(1),
+    TC7_CH0  = (7<<8)|(0),
+    TC7_CH1  = (7<<8)|(1),
+  #endif // __SAMD21J18A__
 } ETCChannel ;
-#endif
 
-extern const void* g_apTCInstances[TCC_INST_NUM+TC_INST_NUM] ;
-
-#define GetTCNumber( x ) ( (x) >> 8 )
-#define GetTCChannelNumber( x ) ( (x) & 0xff )
-#define GetTC( x ) ( g_apTCInstances[(x) >> 8] )
-
-
-#if defined(__SAMD51__)
-
-  typedef enum _EPWMChannel
-  {
-    NOT_ON_PWM=-1,
-    PWM0_CH0=TCC0_CH0,
-    PWM0_CH1=TCC0_CH1,
-    PWM0_CH2=TCC0_CH2,
-    PWM0_CH3=TCC0_CH3,
-    PWM0_CH4=TCC0_CH4,
-    PWM0_CH5=TCC0_CH5,
-    PWM0_CH6=TCC0_CH6,
-    PWM0_CH7=TCC0_CH7,
-    PWM1_CH0=TCC1_CH0,
-    PWM1_CH1=TCC1_CH1,
-    PWM1_CH2=TCC1_CH2,
-    PWM1_CH3=TCC1_CH3,
-    PWM1_CH4=TCC1_CH4,
-    PWM1_CH5=TCC1_CH5,
-    PWM1_CH6=TCC1_CH6,
-    PWM1_CH7=TCC1_CH7,
-  } EPWMChannel ;
-
-#else //end __SAMD51J19A__
 // Definitions for PWM channels
 typedef enum _EPWMChannel
 {
@@ -179,6 +254,11 @@ extern const void* g_apTCInstances[TCC_INST_NUM+TC_INST_NUM] ;
 
 #endif
 
+extern const void* g_apTCInstances[TCC_INST_NUM+TC_INST_NUM] ;
+
+#define GetTCNumber( x ) ( (x) >> 8 )
+#define GetTCChannelNumber( x ) ( (x) & 0xff )
+#define GetTC( x ) ( g_apTCInstances[(x) >> 8] )
 
 typedef enum _EPortType
 {
@@ -186,6 +266,7 @@ typedef enum _EPortType
   PORTA=0,
   PORTB=1,
   PORTC=2,
+  PORTD=3,
 } EPortType ;
 
 #define PIN_NOT_A_PIN (UINT_MAX)
@@ -255,10 +336,19 @@ typedef enum _EPioType
 #define PIN_ATTR_COMBO         (1UL<<0)
 #define PIN_ATTR_ANALOG        (1UL<<1)
 #define PIN_ATTR_DIGITAL       (1UL<<2)
-#define PIN_ATTR_PWM           (1UL<<3)
 #define PIN_ATTR_TIMER         (1UL<<4)
 #define PIN_ATTR_TIMER_ALT     (1UL<<5)
 #define PIN_ATTR_EXTINT        (1UL<<6)
+#define PIN_ATTR_ANALOG_ALT	   (1UL<<7)
+
+#if defined(__SAMD51__)
+// these correspond to the mux table
+#define PIN_ATTR_PWM_E         (1UL<<3)
+#define PIN_ATTR_PWM_F         (1UL<<8)
+#define PIN_ATTR_PWM_G         (1UL<<9)
+#else
+#define PIN_ATTR_PWM           (1UL<<3)
+#endif
 
 /* Types used for the table below */
 typedef struct _PinDescription

cores/arduino/avr/io.h

@@ -25,8 +25,14 @@
 #ifndef _IO_H_
 #define _IO_H_
 
+#ifdef __SAMD51__
+  #define RAMSTART (HSRAM_ADDR)
+  #define RAMSIZE  (HSRAM_SIZE)
+#else
   #define RAMSTART (HMCRAMC0_ADDR)
   #define RAMSIZE  (HMCRAMC0_SIZE)
+#endif
+
 #define RAMEND   (RAMSTART + RAMSIZE - 1)
 
 #endif

cores/arduino/cortex_handlers.c

@@ -127,10 +127,13 @@ void SERCOM7_0_Handler           ( void ) __attribute__ ((weak, alias("Dummy_Han
 void SERCOM7_1_Handler           ( void ) __attribute__ ((weak, alias("Dummy_Handler")));
 void SERCOM7_2_Handler           ( void ) __attribute__ ((weak, alias("Dummy_Handler")));
 void SERCOM7_3_Handler           ( void ) __attribute__ ((weak, alias("Dummy_Handler")));
+void CAN0_Handler                ( void ) __attribute__ ((weak, alias("Dummy_Handler")));
+void CAN1_Handler                ( void ) __attribute__ ((weak, alias("Dummy_Handler")));
 void USB_0_Handler               ( void ) __attribute__ ((weak));
 void USB_1_Handler               ( void ) __attribute__ ((weak));
 void USB_2_Handler               ( void ) __attribute__ ((weak));
 void USB_3_Handler               ( void ) __attribute__ ((weak));
+void GMAC_Handler                ( void ) __attribute__ ((weak, alias("Dummy_Handler")));
 void TCC0_0_Handler              ( void ) __attribute__ ((weak, alias("Dummy_Handler")));
 void TCC0_1_Handler              ( void ) __attribute__ ((weak, alias("Dummy_Handler")));
 void TCC0_2_Handler              ( void ) __attribute__ ((weak, alias("Dummy_Handler")));
@@ -193,6 +196,7 @@ extern uint32_t __bss_end__;
 extern uint32_t __StackTop;
 
 /* Exception Table */
+__attribute__ ((used))
 __attribute__ ((section(".isr_vector"))) const DeviceVectors exception_table =
 {
 	/* Configure Initial Stack Pointer, using linker-generated symbols */
@@ -294,13 +298,13 @@ __attribute__ ((section(".isr_vector"))) const DeviceVectors exception_table =
 	  (void*) SERCOM7_1_Handler,             /* 75 Serial Communication Interface 7 IRQ 1 */
 	  (void*) SERCOM7_2_Handler,             /* 76 Serial Communication Interface 7 IRQ 2 */
 	  (void*) SERCOM7_3_Handler,             /* 77 Serial Communication Interface 7 IRQ 3 */
-	  (void*) (0UL),
-	  (void*) (0UL),
+	  (void*) CAN0_Handler,                  /* 78 Control Area Network 0 (SAM E5x) */
+	  (void*) CAN1_Handler,                  /* 79 Control Area Network 0 (SAM E5x) */
 	  (void*) USB_0_Handler,                 /* 80 Universal Serial Bus IRQ 0 */
 	  (void*) USB_1_Handler,                 /* 81 Universal Serial Bus IRQ 1 */
 	  (void*) USB_2_Handler,                 /* 82 Universal Serial Bus IRQ 2 */
 	  (void*) USB_3_Handler,                 /* 83 Universal Serial Bus IRQ 3 */
-	  (void*) (0UL),
+	  (void*) GMAC_Handler,					 /* 84 Ethernet MAC */
 	  (void*) TCC0_0_Handler,                /* 85 Timer Counter Control 0 IRQ 0 */
 	  (void*) TCC0_1_Handler,                /* 86 Timer Counter Control 0 IRQ 1 */
 	  (void*) TCC0_2_Handler,                /* 87 Timer Counter Control 0 IRQ 2 */
@@ -404,6 +408,7 @@ extern uint32_t __bss_end__;
 extern uint32_t __StackTop;
 
 /* Exception Table */
+__attribute__ ((used))
 __attribute__ ((section(".isr_vector"))) const DeviceVectors exception_table =
 {
   /* Configure Initial Stack Pointer, using linker-generated symbols */

cores/arduino/delay.c

@@ -61,6 +61,33 @@ unsigned long micros( void )
   // a runtime multiplication and shift, saving a few cycles
 }
 
+#ifdef __SAMD51__
+/*
+ * On SAMD51, use the (32bit) cycle count maintained by the DWT unit,
+ * and count exact number of cycles elapsed, rather than guessing how
+ * many cycles a loop takes, which is dangerous in the presence of
+ * cache.  The overhead of the call and internal code is "about" 20
+ * cycles.  (at 120MHz, that's about 1/6 us)
+ */
+void delayMicroseconds(unsigned int us)
+{
+  uint32_t start, elapsed;
+  uint32_t count;
+
+  if (us == 0)
+    return;
+
+  count = us * (VARIANT_MCK / 1000000) - 20;  // convert us to cycles.
+  start = DWT->CYCCNT;  //CYCCNT is 32bits, takes 37s or so to wrap.
+  while (1) {
+    elapsed = DWT->CYCCNT - start;
+    if (elapsed >= count)
+      return;
+  }
+}
+#endif
+
+
 void delay( unsigned long ms )
 {
   if (ms == 0)
@@ -68,12 +95,17 @@ void delay( unsigned long ms )
     return;
   }
 
-  uint32_t start = _ulTickCount ;
+  uint32_t start = micros();
 
-  do
+  while (ms > 0)
   {
     yield();
-  } while ( _ulTickCount - start < ms ) ;
+    while (ms > 0 && (micros() - start) >= 1000)
+    {
+      ms--;
+      start += 1000;
+    }
+  }
 }
 
 #include "Reset.h" // for tickReset()
@@ -85,6 +117,17 @@ void SysTick_DefaultHandler(void)
   tickReset();
 }
 
+#if defined(USE_TINYUSB)
+
+// run TinyUSB background task when yield()
+void yield(void)
+{
+  TinyUSB_Device_Task();
+  TinyUSB_Device_FlushCDC();
+}
+
+#endif
+
 #ifdef __cplusplus
 }
 #endif

cores/arduino/delay.h

@@ -61,6 +61,9 @@ extern void delay( unsigned long dwMs ) ;
  *
  * \param dwUs the number of microseconds to pause (uint32_t)
  */
+#if defined(__SAMD51__)
+extern void delayMicroseconds( unsigned int );
+#else
 static __inline__ void delayMicroseconds( unsigned int ) __attribute__((always_inline, unused)) ;
 static __inline__ void delayMicroseconds( unsigned int usec )
 {
@@ -68,21 +71,6 @@ static __inline__ void delayMicroseconds( unsigned int usec )
   {
     return ;
   }
-
-#if defined(__SAMD51__)
-  uint32_t n = usec * (VARIANT_MCK / 1000000) / 12;
-
-  __asm__ __volatile__(
-    "1:              \n"
-    "   sub %0, #1   \n" // substract 1 from %0 (n)
-    "   cmp %0, #0   \n" // compare to 0
-    "   bne 1b       \n" // if result is not 0 jump to 1
-    : "+r" (n)           // '%0' is n variable with RW constraints
-    :                    // no input
-    :                    // no clobber
-  );
-
-#else
   /*
    *  The following loop:
    *
@@ -109,10 +97,10 @@ static __inline__ void delayMicroseconds( unsigned int usec )
     :                    // no input
     :                    // no clobber
   );
-#endif
   // https://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html
   // https://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html#Volatile
 }
+#endif
 
 #ifdef __cplusplus
 }

cores/arduino/hooks.c

@@ -28,6 +28,7 @@
 static void __empty() {
 	// Empty
 }
+
 void yield(void) __attribute__ ((weak, alias("__empty")));
 
 /**

cores/arduino/main.cpp

@@ -39,7 +39,10 @@ int main( void )
   initVariant();
 
   delay(1);
-#if defined(USBCON)
+
+#if defined(USE_TINYUSB)
+  TinyUSB_Device_Init(0);
+#elif defined(USBCON)
   USBDevice.init();
   USBDevice.attach();
 #endif
@@ -49,6 +52,8 @@ int main( void )
   for (;;)
   {
     loop();
+    yield(); // yield run usb background task
+
     if (serialEventRun) serialEventRun();
   }
 

cores/arduino/math_helper.c

@@ -164,13 +164,14 @@ void arm_float_to_q12_20(float *pIn, q31_t * pOut, uint32_t numSamples)
 uint32_t arm_compare_fixed_q15(q15_t *pIn, q15_t * pOut, uint32_t numSamples)
 {
   uint32_t i; 
-  int32_t diff, diffCrnt = 0;
+  int32_t diff;
+  uint32_t diffCrnt = 0;
   uint32_t maxDiff = 0;
 
   for (i = 0; i < numSamples; i++)
   {
     diff = pIn[i] - pOut[i];
-  	diffCrnt = (diff > 0) ? diff : -diff;
+    diffCrnt = (uint32_t)( (diff > 0) ? diff : -diff );
 
     if(diffCrnt > maxDiff)
     {
@@ -192,13 +193,14 @@ uint32_t arm_compare_fixed_q15(q15_t *pIn, q15_t * pOut, uint32_t numSamples)
 uint32_t arm_compare_fixed_q31(q31_t *pIn, q31_t * pOut, uint32_t numSamples)
 {
   uint32_t i; 
-  int32_t diff, diffCrnt = 0;
+  int32_t diff;
+  uint32_t diffCrnt = 0;
   uint32_t maxDiff = 0;
 
   for (i = 0; i < numSamples; i++)
   {
     diff = pIn[i] - pOut[i];
-  	diffCrnt = (diff > 0) ? diff : -diff;
+    diffCrnt = (uint32_t)( (diff > 0) ? diff : -diff );
 
     if(diffCrnt > maxDiff)
     {

cores/arduino/pulse.c

@@ -34,6 +34,36 @@ uint32_t pulseIn(uint32_t pin, uint32_t state, uint32_t timeout)
   uint32_t bit = 1 << p.ulPin;
   uint32_t stateMask = state ? bit : 0;
 
+#if defined(__SAMD51__)
+  /*
+   * The SAMD51 is fast enough to use really obvious code (similar to
+   * what was used to produce pulse_asm.S, but using micros() for timing.
+   * No assembly required, no conversion of loop counts to times (which is
+   * worrisome in the presence of cache.)
+   */
+  const volatile uint32_t *port = &(PORT->Group[p.ulPort].IN.reg);
+  uint32_t usCallStart;  // microseconds at start of call, for timeout.
+  uint32_t usPulseStart; // microseconds at start of measured pulse.
+  usCallStart = usPulseStart = micros();
+  // wait for any previous pulse to end
+  while ((*port & bit) == stateMask) {
+      if (micros() - usCallStart > timeout)
+          return -1;
+  }
+  // wait for the pulse to start
+  while ((*port & bit) != stateMask) {
+      usPulseStart = micros();
+      if (usPulseStart - usCallStart > timeout)
+          return -2;
+  }
+
+  // wait for the pulse to stop
+  while ((*port & bit) == stateMask) {
+      if (micros() - usCallStart > timeout)
+          return -3;
+  }
+  return micros() - usPulseStart;
+#else
   // convert the timeout from microseconds to a number of times through
   // the initial loop; it takes (roughly) 13 clock cycles per iteration.
   uint32_t maxloops = microsecondsToClockCycles(timeout) / 13;
@@ -48,5 +78,6 @@ uint32_t pulseIn(uint32_t pin, uint32_t state, uint32_t timeout)
     return clockCyclesToMicroseconds(width * 13 + 16);
   else
     return 0;
+#endif // SAMD51
 }
 

cores/arduino/startup.c

@@ -63,7 +63,7 @@ void SystemInit( void )
    * 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;
+  OSC32KCTRL->XOSC32K.reg = OSC32KCTRL_XOSC32K_ENABLE | OSC32KCTRL_XOSC32K_EN1K | OSC32KCTRL_XOSC32K_EN32K | OSC32KCTRL_XOSC32K_CGM_XT | OSC32KCTRL_XOSC32K_XTALEN;
   
   while( (OSC32KCTRL->STATUS.reg & OSC32KCTRL_STATUS_XOSC32KRDY) == 0 ){
     /* Wait for oscillator to be ready */
@@ -97,7 +97,7 @@ void SystemInit( void )
   }
   
   /* ----------------------------------------------------------------------------------------------
-   * 3) Put Generic Clock Generator 3 as source for Generic Clock Gen 0 (DFLL48M reference)
+   * 3) Put OSCULP32K as source for Generic Clock Generator 0
    */
   GCLK->GENCTRL[0].reg = GCLK_GENCTRL_SRC(GCLK_GENCTRL_SRC_OSCULP32K) | GCLK_GENCTRL_GENEN;
   
@@ -146,7 +146,7 @@ void SystemInit( void )
       /* Wait for synchronization */
     }
   
-  GCLK->GENCTRL[GENERIC_CLOCK_GENERATOR_1M].reg = GCLK_GENCTRL_SRC(GCLK_GENCTRL_SRC_DFLL_Val) | GCLK_GENCTRL_GENEN | GCLK_GENCTRL_DIV(24u);
+  GCLK->GENCTRL[GENERIC_CLOCK_GENERATOR_1M].reg = GCLK_GENCTRL_SRC(GCLK_GENCTRL_SRC_DFLL_Val) | GCLK_GENCTRL_GENEN | GCLK_GENCTRL_DIV(48u);
   
   while ( GCLK->SYNCBUSY.bit.GENCTRL5 ){
     /* Wait for synchronization */
@@ -160,7 +160,8 @@ void SystemInit( void )
   //PLL0 is 120MHz
   GCLK->PCHCTRL[OSCCTRL_GCLK_ID_FDPLL0].reg = (1 << GCLK_PCHCTRL_CHEN_Pos) | GCLK_PCHCTRL_GEN(GCLK_PCHCTRL_GEN_GCLK5_Val);
   
-  OSCCTRL->Dpll[0].DPLLRATIO.reg = OSCCTRL_DPLLRATIO_LDRFRAC(0x00) | OSCCTRL_DPLLRATIO_LDR(59); //120 Mhz
+  // This rounds to nearest full-MHz increment; not currently using frac
+  OSCCTRL->Dpll[0].DPLLRATIO.reg = OSCCTRL_DPLLRATIO_LDRFRAC(0x00) | OSCCTRL_DPLLRATIO_LDR((F_CPU - 500000) / 1000000);
   
   while(OSCCTRL->Dpll[0].DPLLSYNCBUSY.bit.DPLLRATIO);
   
@@ -174,7 +175,7 @@ void SystemInit( void )
   //PLL1 is 100MHz
   GCLK->PCHCTRL[OSCCTRL_GCLK_ID_FDPLL1].reg = (1 << GCLK_PCHCTRL_CHEN_Pos) | GCLK_PCHCTRL_GEN(GCLK_PCHCTRL_GEN_GCLK5_Val);
   
-  OSCCTRL->Dpll[1].DPLLRATIO.reg = OSCCTRL_DPLLRATIO_LDRFRAC(0x00) | OSCCTRL_DPLLRATIO_LDR(49); //100 Mhz
+  OSCCTRL->Dpll[1].DPLLRATIO.reg = OSCCTRL_DPLLRATIO_LDRFRAC(0x00) | OSCCTRL_DPLLRATIO_LDR(99); //100 Mhz
   
   while(OSCCTRL->Dpll[1].DPLLSYNCBUSY.bit.DPLLRATIO);
   
@@ -216,7 +217,7 @@ void SystemInit( void )
   GCLK->GENCTRL[GENERIC_CLOCK_GENERATOR_12M].reg = GCLK_GENCTRL_SRC(GCLK_GENCTRL_SRC_DFLL_Val) |
     GCLK_GENCTRL_IDC |
     GCLK_GENCTRL_DIV(4) |
-    GCLK_GENCTRL_DIVSEL |
+    //GCLK_GENCTRL_DIVSEL |
     //GCLK_GENCTRL_OE |
     GCLK_GENCTRL_GENEN;
   
@@ -253,6 +254,54 @@ void SystemInit( void )
   __enable_irq();
 #endif
 
+  /*---------------------------------------------------------------------
+   * Start up the "Debug Watchpoint and Trace" unit, so that we can use
+   * it's 32bit cycle counter for timing.
+   */
+  CoreDebug->DEMCR |= CoreDebug_DEMCR_TRCENA_Msk;
+  DWT->CTRL |= DWT_CTRL_CYCCNTENA_Msk;
+
+  /* ----------------------------------------------------------------------------------------------
+   * 5) Load AC factory calibration values
+   */
+
+  uint32_t bias0 = (*((uint32_t *)AC_FUSES_BIAS0_ADDR) & AC_FUSES_BIAS0_Msk) >> AC_FUSES_BIAS0_Pos;
+  AC->CALIB.reg = AC_CALIB_BIAS0(bias0);
+
+  /* ----------------------------------------------------------------------------------------------
+   * 6) Load ADC factory calibration values
+   */
+
+  // ADC0 Bias Calibration
+  uint32_t biascomp = (*((uint32_t *)ADC0_FUSES_BIASCOMP_ADDR) & ADC0_FUSES_BIASCOMP_Msk) >> ADC0_FUSES_BIASCOMP_Pos;
+  uint32_t biasr2r = (*((uint32_t *)ADC0_FUSES_BIASR2R_ADDR) & ADC0_FUSES_BIASR2R_Msk) >> ADC0_FUSES_BIASR2R_Pos;
+  uint32_t biasref = (*((uint32_t *)ADC0_FUSES_BIASREFBUF_ADDR) & ADC0_FUSES_BIASREFBUF_Msk) >> ADC0_FUSES_BIASREFBUF_Pos;
+
+  ADC0->CALIB.reg = ADC_CALIB_BIASREFBUF(biasref)
+                    | ADC_CALIB_BIASR2R(biasr2r)
+                    | ADC_CALIB_BIASCOMP(biascomp);
+
+  // ADC1 Bias Calibration
+  biascomp = (*((uint32_t *)ADC1_FUSES_BIASCOMP_ADDR) & ADC1_FUSES_BIASCOMP_Msk) >> ADC1_FUSES_BIASCOMP_Pos;
+  biasr2r = (*((uint32_t *)ADC1_FUSES_BIASR2R_ADDR) & ADC1_FUSES_BIASR2R_Msk) >> ADC1_FUSES_BIASR2R_Pos;
+  biasref = (*((uint32_t *)ADC1_FUSES_BIASREFBUF_ADDR) & ADC1_FUSES_BIASREFBUF_Msk) >> ADC1_FUSES_BIASREFBUF_Pos;
+
+  ADC1->CALIB.reg = ADC_CALIB_BIASREFBUF(biasref)
+                    | ADC_CALIB_BIASR2R(biasr2r)
+                    | ADC_CALIB_BIASCOMP(biascomp);
+
+  /* ----------------------------------------------------------------------------------------------
+   * 7) Load USB factory calibration values
+   */
+
+  //USB Calibration
+  uint32_t usbtransn = (*((uint32_t *)USB_FUSES_TRANSN_ADDR) & USB_FUSES_TRANSN_Msk) >> USB_FUSES_TRANSN_Pos;
+  uint32_t usbtransp = (*((uint32_t *)USB_FUSES_TRANSP_ADDR) & USB_FUSES_TRANSP_Msk) >> USB_FUSES_TRANSP_Pos;
+  uint32_t usbtrim = (*((uint32_t *)USB_FUSES_TRIM_ADDR) & USB_FUSES_TRIM_Msk) >> USB_FUSES_TRIM_Pos;
+  USB->DEVICE.PADCAL.reg = USB_PADCAL_TRIM(usbtrim)
+                           | USB_PADCAL_TRANSN(usbtransn)
+                           | USB_PADCAL_TRANSP(usbtransp);
+
 //*************** END SAMD51 *************************//
   
 #else
@@ -528,4 +577,3 @@ void SystemInit( void )
     NVMCTRL->CTRLB.bit.MANW = 1;
   #endif
 }
-

cores/arduino/wiring.c

@@ -25,8 +25,7 @@ extern "C" {
 
 
 #if defined(__SAMD51__)
-//CHANGE THIS IF YOU CHANGE THE CLOCK SPEED
-uint32_t SystemCoreClock=120000000ul ;
+uint32_t SystemCoreClock=F_CPU;
 #else
 /*
  * System Core Clock is at 1MHz (8MHz/8) at Reset.
@@ -79,19 +78,21 @@ void init( void )
 //  PM->APBAMASK.reg |= PM_APBAMASK_EIC ;
 
 #if defined(__SAMD51__)
-  MCLK->APBAMASK.reg |= MCLK_APBAMASK_SERCOM0 | MCLK_APBAMASK_SERCOM1;
+  MCLK->APBAMASK.reg |= MCLK_APBAMASK_SERCOM0 | MCLK_APBAMASK_SERCOM1 | MCLK_APBAMASK_TC0 | MCLK_APBAMASK_TC1;
   
   MCLK->APBBMASK.reg |= MCLK_APBBMASK_SERCOM2 | MCLK_APBBMASK_SERCOM3 | MCLK_APBBMASK_TCC0 | MCLK_APBBMASK_TCC1 | MCLK_APBBMASK_TC3 | MCLK_APBBMASK_TC2;
   
-  MCLK->APBCMASK.reg |= MCLK_APBCMASK_TCC2 | MCLK_APBCMASK_TC4 | MCLK_APBCMASK_TC5;
+  MCLK->APBCMASK.reg |= MCLK_APBCMASK_TCC2 | MCLK_APBCMASK_TCC3 | MCLK_APBCMASK_TC4 | MCLK_APBCMASK_TC5;
+  
+  MCLK->APBDMASK.reg |= MCLK_APBDMASK_DAC | MCLK_APBDMASK_SERCOM4 | MCLK_APBDMASK_SERCOM5 | MCLK_APBDMASK_ADC0 | MCLK_APBDMASK_ADC1 | MCLK_APBDMASK_TCC4
+		  | MCLK_APBDMASK_TC6 | MCLK_APBDMASK_TC7 | MCLK_APBDMASK_SERCOM6 | MCLK_APBDMASK_SERCOM7;
 
-  MCLK->APBDMASK.reg |= MCLK_APBDMASK_DAC | MCLK_APBDMASK_SERCOM4 | MCLK_APBDMASK_SERCOM5 | MCLK_APBDMASK_ADC0 | MCLK_APBDMASK_ADC1;
 #else
   // Clock SERCOM for Serial
   PM->APBCMASK.reg |= PM_APBCMASK_SERCOM0 | PM_APBCMASK_SERCOM1 | PM_APBCMASK_SERCOM2 | PM_APBCMASK_SERCOM3 | PM_APBCMASK_SERCOM4 | PM_APBCMASK_SERCOM5 ;
 
   // Clock TC/TCC for Pulse and Analog
-  PM->APBCMASK.reg |= PM_APBCMASK_TCC0 | PM_APBCMASK_TCC1 | PM_APBCMASK_TCC2 | PM_APBCMASK_TC3 | PM_APBCMASK_TC4 | PM_APBCMASK_TC5 ;
+  PM->APBCMASK.reg |= PM_APBCMASK_TCC0 | PM_APBCMASK_TCC1 | PM_APBCMASK_TCC2 | PM_APBCMASK_TC3 | PM_APBCMASK_TC4 | PM_APBCMASK_TC5 | PM_APBCMASK_TC6 | PM_APBCMASK_TC7;
 
   // ATSAMR, for example, doesn't have a DAC
   #ifdef PM_APBCMASK_DAC
@@ -100,35 +101,45 @@ void init( void )
   #endif
 #endif
 
+/* 
+  Commented out to leave pins in default tri-state.  This is
+  aimed at avoiding power consumption in DeepSleep.
+  
   // Setup all pins (digital and analog) in INPUT mode (default is nothing)
   for (uint32_t ul = 0 ; ul < NUM_DIGITAL_PINS ; ul++ )
   {
     pinMode( ul, INPUT ) ;
   }
+*/
 
   // Initialize Analog Controller
   // Setting clock
 #if defined(__SAMD51__)
+  //set to 1/(1/(48000000/32) * 6) = 250000 SPS
 	GCLK->PCHCTRL[ADC0_GCLK_ID].reg = GCLK_PCHCTRL_GEN_GCLK1_Val | (1 << GCLK_PCHCTRL_CHEN_Pos); //use clock generator 1 (48Mhz)
+	GCLK->PCHCTRL[ADC1_GCLK_ID].reg = GCLK_PCHCTRL_GEN_GCLK1_Val | (1 << GCLK_PCHCTRL_CHEN_Pos); //use clock generator 1 (48Mhz)
+	Adc *adcs[] = {ADC0, ADC1};
+		for(int i=0; i<2; i++){
 
-	ADC0->CTRLA.bit.PRESCALER = ADC_CTRLA_PRESCALER_DIV256_Val;
-	ADC0->CTRLB.bit.RESSEL = ADC_CTRLB_RESSEL_10BIT_Val;
+		adcs[i]->CTRLA.bit.PRESCALER = ADC_CTRLA_PRESCALER_DIV32_Val;
+		adcs[i]->CTRLB.bit.RESSEL = ADC_CTRLB_RESSEL_10BIT_Val;
 
-	while( ADC0->SYNCBUSY.reg & ADC_SYNCBUSY_CTRLB );  //wait for sync
+		while( adcs[i]->SYNCBUSY.reg & ADC_SYNCBUSY_CTRLB );  //wait for sync
 
-	ADC0->SAMPCTRL.reg = 0x3f;                        // Set max Sampling Time Length
+		adcs[i]->SAMPCTRL.reg = 5;                        // sampling Time Length
 
-	while( ADC0->SYNCBUSY.reg & ADC_SYNCBUSY_SAMPCTRL );  //wait for sync
+		while( adcs[i]->SYNCBUSY.reg & ADC_SYNCBUSY_SAMPCTRL );  //wait for sync
 
-	ADC0->INPUTCTRL.reg = ADC_INPUTCTRL_MUXNEG_GND;   // No Negative input (Internal Ground)
+		adcs[i]->INPUTCTRL.reg = ADC_INPUTCTRL_MUXNEG_GND;   // No Negative input (Internal Ground)
 
-	while( ADC0->SYNCBUSY.reg & ADC_SYNCBUSY_INPUTCTRL );  //wait for sync
+		while( adcs[i]->SYNCBUSY.reg & ADC_SYNCBUSY_INPUTCTRL );  //wait for sync
 
 		// Averaging (see datasheet table in AVGCTRL register description)
-	ADC0->AVGCTRL.reg = ADC_AVGCTRL_SAMPLENUM_1 |    // 1 sample only (no oversampling nor averaging)
+		adcs[i]->AVGCTRL.reg = ADC_AVGCTRL_SAMPLENUM_1 |    // 1 sample only (no oversampling nor averaging)
 							ADC_AVGCTRL_ADJRES(0x0ul);   // Adjusting result by 0
 
-	while( ADC0->SYNCBUSY.reg & ADC_SYNCBUSY_AVGCTRL );  //wait for sync
+		while( adcs[i]->SYNCBUSY.reg & ADC_SYNCBUSY_AVGCTRL );  //wait for sync
+	}
 
 	analogReference( AR_DEFAULT ) ; // Analog Reference is AREF pin (3.3v)
 	
@@ -146,6 +157,8 @@ void init( void )
 	DAC->DACCTRL[1].bit.REFRESH = 2;
 
 #else
+  //set to 1/(1/(48000000/32) * 6) = 250000 SPS
+
   while(GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY);
 
   GCLK->CLKCTRL.reg = GCLK_CLKCTRL_ID( GCM_ADC ) | // Generic Clock ADC
@@ -154,10 +167,10 @@ void init( void )
 
   while( ADC->STATUS.bit.SYNCBUSY == 1 );          // Wait for synchronization of registers between the clock domains
 
-  ADC->CTRLB.reg = ADC_CTRLB_PRESCALER_DIV512 |    // Divide Clock by 512.
+  ADC->CTRLB.reg = ADC_CTRLB_PRESCALER_DIV32 |    // Divide Clock by 32.
                    ADC_CTRLB_RESSEL_10BIT;         // 10 bits resolution as default
 
-  ADC->SAMPCTRL.reg = 0x3f;                        // Set max Sampling Time Length
+  ADC->SAMPCTRL.reg = 5;                        // Sampling Time Length
 
   while( ADC->STATUS.bit.SYNCBUSY == 1 );          // Wait for synchronization of registers between the clock domains
 

cores/arduino/wiring_analog.c

@@ -32,7 +32,7 @@ static int _writeResolution = 12;
 static int _dacResolution = 12;
 #else
 static int _writeResolution = 8;
-static int _dacResolution = 8;
+//static int _dacResolution = 10;
 #endif
 
 
@@ -77,17 +77,21 @@ void analogReadResolution(int res)
 
 	if (res > 10) {
 		ADC0->CTRLB.bit.RESSEL = ADC_CTRLB_RESSEL_12BIT_Val;
+		ADC1->CTRLB.bit.RESSEL = ADC_CTRLB_RESSEL_12BIT_Val;
 		_ADCResolution = 12;
 		} else if (res > 8) {
 		ADC0->CTRLB.bit.RESSEL = ADC_CTRLB_RESSEL_10BIT_Val;
+		ADC1->CTRLB.bit.RESSEL = ADC_CTRLB_RESSEL_10BIT_Val;
 		_ADCResolution = 10;
 		} else {
 		ADC0->CTRLB.bit.RESSEL = ADC_CTRLB_RESSEL_8BIT_Val;
+		ADC1->CTRLB.bit.RESSEL = ADC_CTRLB_RESSEL_8BIT_Val;
 		_ADCResolution = 8;
 	}
 
 
 	while(ADC0->SYNCBUSY.reg & ADC_SYNCBUSY_CTRLB); //wait for sync
+	while(ADC1->SYNCBUSY.reg & ADC_SYNCBUSY_CTRLB); //wait for sync
 #else
 
 	if (res > 10) {
@@ -131,38 +135,92 @@ void analogReference(eAnalogReference mode)
 {
 #if defined(__SAMD51__)
 	while(ADC0->SYNCBUSY.reg & ADC_SYNCBUSY_REFCTRL); //wait for sync
+	while(ADC1->SYNCBUSY.reg & ADC_SYNCBUSY_REFCTRL); //wait for sync
 	
 	//TODO: fix gains
 	switch (mode)
 	{
-		case AR_INTERNAL:
-		case AR_INTERNAL2V23:
+		case AR_INTERNAL1V0:
 		//ADC0->GAINCORR.reg = ADC_GAINCORR_GAINCORR();      // Gain Factor Selection
-		ADC0->REFCTRL.bit.REFSEL = ADC_REFCTRL_REFSEL_INTVCC0_Val; // 1/1.48 VDDANA = 1/1.48* 3V3 = 2.2297
+		SUPC->VREF.bit.SEL = SUPC_VREF_SEL_1V0_Val;		// select 1.0V
+		SUPC->VREF.bit.VREFOE = 1;	//	Turn on for use with ADC
+		ADC0->REFCTRL.bit.REFSEL = ADC_REFCTRL_REFSEL_INTREF_Val; // Use SUPC.VREF
+		ADC1->REFCTRL.bit.REFSEL = ADC_REFCTRL_REFSEL_INTREF_Val; // 
+		break;
+		
+		case AR_INTERNAL1V1:
+		//ADC0->GAINCORR.reg = ADC_GAINCORR_GAINCORR();      // Gain Factor Selection
+		SUPC->VREF.bit.SEL = SUPC_VREF_SEL_1V1_Val;		// select 1.1V
+		SUPC->VREF.bit.VREFOE = 1;	//	Turn on for use with ADC
+		ADC0->REFCTRL.bit.REFSEL = ADC_REFCTRL_REFSEL_INTREF_Val; // Use SUPC.VREF
+		ADC1->REFCTRL.bit.REFSEL = ADC_REFCTRL_REFSEL_INTREF_Val; // 
+		break;
+		
+		case AR_INTERNAL1V2:
+		//ADC0->GAINCORR.reg = ADC_GAINCORR_GAINCORR();      // Gain Factor Selection
+		SUPC->VREF.bit.SEL = SUPC_VREF_SEL_1V2_Val;		// select 1V2
+		SUPC->VREF.bit.VREFOE = 1;	//	Turn on for use with ADC
+		ADC0->REFCTRL.bit.REFSEL = ADC_REFCTRL_REFSEL_INTREF_Val; // Use SUPC.VREF
+		ADC1->REFCTRL.bit.REFSEL = ADC_REFCTRL_REFSEL_INTREF_Val; // 
+		break;
+
+		case AR_INTERNAL1V25:
+		//ADC0->GAINCORR.reg = ADC_GAINCORR_GAINCORR();      // Gain Factor Selection
+		SUPC->VREF.bit.SEL = SUPC_VREF_SEL_1V25_Val;		// select 1.25V
+		SUPC->VREF.bit.VREFOE = 1;	//	Turn on for use with ADC
+		ADC0->REFCTRL.bit.REFSEL = ADC_REFCTRL_REFSEL_INTREF_Val; // Use SUPC.VREF
+		ADC1->REFCTRL.bit.REFSEL = ADC_REFCTRL_REFSEL_INTREF_Val; // 
+		break;
+		
+		case AR_INTERNAL2V0:
+		//ADC0->GAINCORR.reg = ADC_GAINCORR_GAINCORR();      // Gain Factor Selection
+		SUPC->VREF.bit.SEL = SUPC_VREF_SEL_2V0_Val;		// select 2.0V
+		SUPC->VREF.bit.VREFOE = 1;	//	Turn on for use with ADC
+		ADC0->REFCTRL.bit.REFSEL = ADC_REFCTRL_REFSEL_INTREF_Val; // Use SUPC.VREF
+		ADC1->REFCTRL.bit.REFSEL = ADC_REFCTRL_REFSEL_INTREF_Val; // 
+		break;
+		
+		case AR_INTERNAL2V2:
+		//ADC0->GAINCORR.reg = ADC_GAINCORR_GAINCORR();      // Gain Factor Selection
+		SUPC->VREF.bit.SEL = SUPC_VREF_SEL_2V2_Val;		// select 2.2V
+		SUPC->VREF.bit.VREFOE = 1;	//	Turn on for use with ADC
+		ADC0->REFCTRL.bit.REFSEL = ADC_REFCTRL_REFSEL_INTREF_Val; // Use SUPC.VREF
+		ADC1->REFCTRL.bit.REFSEL = ADC_REFCTRL_REFSEL_INTREF_Val; // 
+		break;
+		
+		case AR_INTERNAL2V4:
+		//ADC0->GAINCORR.reg = ADC_GAINCORR_GAINCORR();      // Gain Factor Selection
+		SUPC->VREF.bit.SEL = SUPC_VREF_SEL_2V4_Val;		// select 2.4V
+		SUPC->VREF.bit.VREFOE = 1;	//	Turn on for use with ADC
+		ADC0->REFCTRL.bit.REFSEL = ADC_REFCTRL_REFSEL_INTREF_Val; // Use SUPC.VREF
+		ADC1->REFCTRL.bit.REFSEL = ADC_REFCTRL_REFSEL_INTREF_Val; // 
+		break;
+		
+		case AR_INTERNAL2V5:
+		//ADC0->GAINCORR.reg = ADC_GAINCORR_GAINCORR();      // Gain Factor Selection
+		SUPC->VREF.bit.SEL = SUPC_VREF_SEL_2V5_Val;		// select 2.5V
+		SUPC->VREF.bit.VREFOE = 1;	//	Turn on for use with ADC
+		ADC0->REFCTRL.bit.REFSEL = ADC_REFCTRL_REFSEL_INTREF_Val; // Use SUPC.VREF
+		ADC1->REFCTRL.bit.REFSEL = ADC_REFCTRL_REFSEL_INTREF_Val; // 
 		break;
 		
 		case AR_EXTERNAL:
 		//ADC0->INPUTCTRL.bit.GAIN = ADC_INPUTCTRL_GAIN_1X_Val;      // Gain Factor Selection
-		ADC0->REFCTRL.bit.REFSEL = ADC_REFCTRL_REFSEL_AREFA_Val;
+		ADC0->REFCTRL.bit.REFSEL = ADC_REFCTRL_REFSEL_AREFA_Val;	// AREF is jumpered to VCC, so 3.3V
+		ADC1->REFCTRL.bit.REFSEL = ADC_REFCTRL_REFSEL_AREFA_Val;
 		break;
 
-/*		Don't think this works on SAMD51
-		case AR_INTERNAL1V0:
-		//ADC0->INPUTCTRL.bit.GAIN = ADC_INPUTCTRL_GAIN_1X_Val;      // Gain Factor Selection
-		ADC0->REFCTRL.bit.REFSEL = ADC_REFCTRL_REFSEL_INT1V_Val;   // 1.0V voltage reference
-		break;
-*/
-
 		case AR_INTERNAL1V65:
-		//ADC0->INPUTCTRL.bit.GAIN = ADC_INPUTCTRL_GAIN_1X_Val;      // Gain Factor Selection
-		ADC0->REFCTRL.bit.REFSEL = ADC_REFCTRL_REFSEL_INTVCC1_Val; // 1/2 VDDANA = 0.5* 3V3 = 1.65V
+		//ADC0->INPUTCTRL.bit.GAIN = ADC_INPUTCTRL_GAIN_DIV2_Val;
+		ADC0->REFCTRL.bit.REFSEL = ADC_REFCTRL_REFSEL_INTVCC0_Val; // 1/2 VDDANA = 1.65
+		ADC1->REFCTRL.bit.REFSEL = ADC_REFCTRL_REFSEL_INTVCC0_Val; // 
 		break;
 		
 		case AR_DEFAULT:
 		default:
 		//ADC0->INPUTCTRL.bit.GAIN = ADC_INPUTCTRL_GAIN_DIV2_Val;
-		ADC0->REFCTRL.bit.REFSEL = ADC_REFCTRL_REFSEL_INTVCC1_Val; // 1/2 VDDANA = 0.5* 3V3 = 1.65V
-		
+		ADC0->REFCTRL.bit.REFSEL = ADC_REFCTRL_REFSEL_INTVCC1_Val; // VDDANA = 3V3
+		ADC1->REFCTRL.bit.REFSEL = ADC_REFCTRL_REFSEL_INTVCC1_Val; // 
 		break;
 	}
 	
@@ -170,7 +228,6 @@ void analogReference(eAnalogReference mode)
   syncADC();
   switch (mode)
   {
-    case AR_INTERNAL:
     case AR_INTERNAL2V23:
       ADC->INPUTCTRL.bit.GAIN = ADC_INPUTCTRL_GAIN_1X_Val;      // Gain Factor Selection
       ADC->REFCTRL.bit.REFSEL = ADC_REFCTRL_REFSEL_INTVCC0_Val; // 1/1.48 VDDANA = 1/1.48* 3V3 = 2.2297
@@ -223,8 +280,8 @@ uint32_t analogRead(uint32_t pin)
 #ifdef DAC
 
 	#if defined(__SAMD51__)
-	  if (pin == A0 || pin == A1) { // Disable DAC, if analogWrite(A0,dval) used previously the DAC is enabled
-		uint8_t channel = (pin == PIN_A0 ? 0 : 1);
+	  if (pin == PIN_DAC0 || pin == PIN_DAC1) { // Disable DAC, if analogWrite(A0,dval) used previously the DAC is enabled
+		uint8_t channel = (pin == PIN_DAC0 ? 0 : 1);
 		
 		if(dacEnabled[channel]){
 			dacEnabled[channel] = false;
@@ -241,7 +298,7 @@ uint32_t analogRead(uint32_t pin)
 		
 		while (DAC->SYNCBUSY.bit.ENABLE);
 	#else
-	  if (pin == A0) { // Disable DAC, if analogWrite(A0,dval) used previously the DAC is enabled
+	  if (pin == PIN_DAC0) { // Disable DAC, if analogWrite(A0,dval) used previously the DAC is enabled
 	    syncDAC();
 		
 		DAC->CTRLA.bit.ENABLE = 0x00; // Disable DAC
@@ -253,8 +310,13 @@ uint32_t analogRead(uint32_t pin)
 #endif
 
 #if defined(__SAMD51__)
-  while( ADC0->SYNCBUSY.reg & ADC_SYNCBUSY_INPUTCTRL ); //wait for sync
-  ADC0->INPUTCTRL.bit.MUXPOS = g_APinDescription[pin].ulADCChannelNumber; // Selection for the positive ADC input
+  Adc *adc;
+  if(g_APinDescription[pin].ulPinAttribute & PIN_ATTR_ANALOG) adc = ADC0;
+  else if(g_APinDescription[pin].ulPinAttribute & PIN_ATTR_ANALOG_ALT) adc = ADC1;
+  else return 0;
+
+  while( adc->SYNCBUSY.reg & ADC_SYNCBUSY_INPUTCTRL ); //wait for sync
+  adc->INPUTCTRL.bit.MUXPOS = g_APinDescription[pin].ulADCChannelNumber; // Selection for the positive ADC input
   
   // Control A
   /*
@@ -268,27 +330,27 @@ uint32_t analogRead(uint32_t pin)
    * Before enabling the ADC, the asynchronous clock source must be selected and enabled, and the ADC reference must be
    * configured. The first conversion after the reference is changed must not be used.
    */
-  while( ADC0->SYNCBUSY.reg & ADC_SYNCBUSY_ENABLE ); //wait for sync
-  ADC0->CTRLA.bit.ENABLE = 0x01;             // Enable ADC
+  while( adc->SYNCBUSY.reg & ADC_SYNCBUSY_ENABLE ); //wait for sync
+  adc->CTRLA.bit.ENABLE = 0x01;             // Enable ADC
 
   // Start conversion
-  while( ADC0->SYNCBUSY.reg & ADC_SYNCBUSY_ENABLE ); //wait for sync
+  while( adc->SYNCBUSY.reg & ADC_SYNCBUSY_ENABLE ); //wait for sync
   
-  ADC0->SWTRIG.bit.START = 1;
+  adc->SWTRIG.bit.START = 1;
 
   // Clear the Data Ready flag
-  ADC0->INTFLAG.reg = ADC_INTFLAG_RESRDY;
+  adc->INTFLAG.reg = ADC_INTFLAG_RESRDY;
 
   // Start conversion again, since The first conversion after the reference is changed must not be used.
-  ADC0->SWTRIG.bit.START = 1;
+  adc->SWTRIG.bit.START = 1;
 
   // Store the value
-  while (ADC0->INTFLAG.bit.RESRDY == 0);   // Waiting for conversion to complete
-  valueRead = ADC0->RESULT.reg;
+  while (adc->INTFLAG.bit.RESRDY == 0);   // Waiting for conversion to complete
+  valueRead = adc->RESULT.reg;
 
-  while( ADC0->SYNCBUSY.reg & ADC_SYNCBUSY_ENABLE ); //wait for sync
-  ADC0->CTRLA.bit.ENABLE = 0x00;             // Disable ADC
-  while( ADC0->SYNCBUSY.reg & ADC_SYNCBUSY_ENABLE ); //wait for sync
+  while( adc->SYNCBUSY.reg & ADC_SYNCBUSY_ENABLE ); //wait for sync
+  adc->CTRLA.bit.ENABLE = 0x00;             // Disable ADC
+  while( adc->SYNCBUSY.reg & ADC_SYNCBUSY_ENABLE ); //wait for sync
   
 #else
   syncADC();
@@ -313,6 +375,9 @@ uint32_t analogRead(uint32_t pin)
   syncADC();
   ADC->SWTRIG.bit.START = 1;
 
+  // Waiting for the 1st conversion to complete
+  while (ADC->INTFLAG.bit.RESRDY == 0);
+
   // Clear the Data Ready flag
   ADC->INTFLAG.reg = ADC_INTFLAG_RESRDY;
 
@@ -344,22 +409,21 @@ void analogWrite(uint32_t pin, uint32_t value)
 
  // ATSAMR, for example, doesn't have a DAC
 #ifdef DAC
-
 	  if ((attr & PIN_ATTR_ANALOG) == PIN_ATTR_ANALOG)
 	  {
 	    // DAC handling code
 #if defined(__SAMD51__)
-		if (pin != PIN_A0 && pin != PIN_A1) { // 2 DACs on A0 (PA02) and A1 (PA05)
+		if (pin == PIN_DAC0 || pin == PIN_DAC1) { // 2 DACs on A0 (PA02) and A1 (PA05)
 #else
-	    if (pin != PIN_A0) { // Only 1 DAC on A0 (PA02)
+	    if (pin == PIN_DAC0) { // Only 1 DAC on A0 (PA02)
 #endif
-	      return;
-	    }
+
+#if defined(__SAMD51__)
 
 	    value = mapResolution(value, _writeResolution, _dacResolution);
 
-	#if defined(__SAMD51__)
-		uint8_t channel = (pin == PIN_A0 ? 0 : 1);
+
+			uint8_t channel = (pin == PIN_DAC0 ? 0 : 1);
 
 			pinPeripheral(pin, PIO_ANALOG);
 
@@ -411,66 +475,33 @@ void analogWrite(uint32_t pin, uint32_t value)
 
 
 #else
-	    value = mapResolution(value, _dacResolution, 10);
 			syncDAC();
 			DAC->DATA.reg = value & 0x3FF;  // DAC on 10 bits.
 			syncDAC();
 			DAC->CTRLA.bit.ENABLE = 0x01;     // Enable DAC
 			syncDAC();
-	#endif
+#endif // __SAMD51__
 				return;
 	  }
-#endif
+	}
+#endif // DAC
 
-  if ((attr & PIN_ATTR_PWM) == PIN_ATTR_PWM)
-  {
-#ifndef __SAMD51__
-    value = mapResolution(value, _writeResolution, 16);
-	#endif
+#if defined(__SAMD51__)
+	if(attr & (PIN_ATTR_PWM_E|PIN_ATTR_PWM_F|PIN_ATTR_PWM_G)){
 
 		uint32_t tcNum = GetTCNumber(pinDesc.ulPWMChannel);
 		uint8_t tcChannel = GetTCChannelNumber(pinDesc.ulPWMChannel);
 		static bool tcEnabled[TCC_INST_NUM+TC_INST_NUM];
 
-    if (attr & PIN_ATTR_TIMER) {
-      #if !(ARDUINO_SAMD_VARIANT_COMPLIANCE >= 10603)
-      // Compatibility for cores based on SAMD core <=1.6.2
-      if (pinDesc.ulPinType == PIO_TIMER_ALT) {
-        pinPeripheral(pin, PIO_TIMER_ALT);
-      } else
-      #endif
-      {
-
-#if defined(__SAMD51__)
-          //on SAMD51 we are only using TCC for timers
-          pinPeripheral(pin, PIO_TCC_PDEC);
-#else
+		if(attr & PIN_ATTR_PWM_E)
 			pinPeripheral(pin, PIO_TIMER);
-#endif
-      }
-    } else if ((attr & PIN_ATTR_TIMER_ALT) == PIN_ATTR_TIMER_ALT){
-        //this is on an alt timer
+		else if(attr & PIN_ATTR_PWM_F)
 			pinPeripheral(pin, PIO_TIMER_ALT);
-    }
-    else{
-        return;
-    }
+		else if(attr & PIN_ATTR_PWM_G)
+			pinPeripheral(pin, PIO_TCC_PDEC);
 
 		if (!tcEnabled[tcNum]) {
 		  tcEnabled[tcNum] = true;
-
-#if defined(__SAMD51__)
-	uint32_t GCLK_CLKCTRL_IDs[] = {
-		TCC0_GCLK_ID,
-		TCC1_GCLK_ID,
-		TCC2_GCLK_ID,
-	#if defined(TCC3)
-		TCC3_GCLK_ID,
-		TCC4_GCLK_ID,
-		TC5_GCLK_ID,
-	#endif
-	};
-	
 	      GCLK->PCHCTRL[GCLK_CLKCTRL_IDs[tcNum]].reg = GCLK_PCHCTRL_GEN_GCLK0_Val | (1 << GCLK_PCHCTRL_CHEN_Pos); //use clock generator 0
 
 	      // Set PORT
@@ -527,7 +558,8 @@ void analogWrite(uint32_t pin, uint32_t value)
 				TCCx->CTRLA.bit.ENABLE = 1;
 				while (TCCx->SYNCBUSY.bit.ENABLE);
 			}
-	} else {
+		}
+		else {
 			if (tcNum >= TCC_INST_NUM) {
 				Tc* TCx = (Tc*) GetTC(pinDesc.ulPWMChannel);
 				TCx->COUNT8.CC[tcChannel].reg = (uint8_t) value;
@@ -543,7 +575,39 @@ void analogWrite(uint32_t pin, uint32_t value)
 				}
 		}
 
+		return;
+	}
+	  
 #else
+
+  if ((attr & PIN_ATTR_PWM) == PIN_ATTR_PWM)
+	  {
+	  value = mapResolution(value, _writeResolution, 16);
+
+	  uint32_t tcNum = GetTCNumber(pinDesc.ulPWMChannel);
+	  uint8_t tcChannel = GetTCChannelNumber(pinDesc.ulPWMChannel);
+	  static bool tcEnabled[TCC_INST_NUM+TC_INST_NUM];
+
+	    if (attr & PIN_ATTR_TIMER) {
+#if !(ARDUINO_SAMD_VARIANT_COMPLIANCE >= 10603)
+	      // Compatibility for cores based on SAMD core <=1.6.2
+	      if (pinDesc.ulPinType == PIO_TIMER_ALT) {
+	        pinPeripheral(pin, PIO_TIMER_ALT);
+	      } else
+#endif
+	      {
+	        pinPeripheral(pin, PIO_TIMER);
+	      }
+	    } else if ((attr & PIN_ATTR_TIMER_ALT) == PIN_ATTR_TIMER_ALT){
+	        //this is on an alt timer
+	        pinPeripheral(pin, PIO_TIMER_ALT);
+	    }
+	    else{
+	        return;
+	    }
+
+	    if (!tcEnabled[tcNum]) {
+	      tcEnabled[tcNum] = true;
 		  uint16_t GCLK_CLKCTRL_IDs[] = {
 			GCLK_CLKCTRL_ID(GCM_TCC0_TCC1), // TCC0
 			GCLK_CLKCTRL_ID(GCM_TCC0_TCC1), // TCC1
@@ -607,10 +671,9 @@ void analogWrite(uint32_t pin, uint32_t value)
 			syncTCC(TCCx);
 		  }
 		}
-#endif
-      
 	  return;
   }
+#endif
 
   // -- Defaults to digital write
   pinMode(pin, OUTPUT);

cores/arduino/wiring_analog.h

@@ -27,14 +27,21 @@ extern "C" {
 /*
  * \brief SAMD products have only one reference for ADC
  */
+ // add internal voltages for ATSAMD51 SUPC VREF register
 typedef enum _eAnalogReference
 {
   AR_DEFAULT,
-  AR_INTERNAL,
-  AR_EXTERNAL,
   AR_INTERNAL1V0,
+  AR_INTERNAL1V1,
+  AR_INTERNAL1V2,
+  AR_INTERNAL1V25,
+  AR_INTERNAL2V0,
+  AR_INTERNAL2V2,
+  AR_INTERNAL2V23,
+  AR_INTERNAL2V4,
+  AR_INTERNAL2V5,
   AR_INTERNAL1V65,
-  AR_INTERNAL2V23
+  AR_EXTERNAL
 } eAnalogReference ;
 
 

cores/arduino/wiring_digital.c

@@ -30,39 +30,43 @@ void pinMode( uint32_t ulPin, uint32_t ulMode )
     return ;
   }
 
+  EPortType port = g_APinDescription[ulPin].ulPort;
+  uint32_t pin = g_APinDescription[ulPin].ulPin;
+  uint32_t pinMask = (1ul << pin);
+
   // Set pin mode according to chapter '22.6.3 I/O Pin Configuration'
   switch ( ulMode )
   {
     case INPUT:
       // Set pin to input mode
-      PORT->Group[g_APinDescription[ulPin].ulPort].PINCFG[g_APinDescription[ulPin].ulPin].reg=(uint8_t)(PORT_PINCFG_INEN) ;
-      PORT->Group[g_APinDescription[ulPin].ulPort].DIRCLR.reg = (uint32_t)(1<<g_APinDescription[ulPin].ulPin) ;
+      PORT->Group[port].PINCFG[pin].reg = (uint8_t) (PORT_PINCFG_INEN);
+      PORT->Group[port].DIRCLR.reg = pinMask;
     break;
 
     case INPUT_PULLUP:
       // Set pin to input mode with pull-up resistor enabled
-      PORT->Group[g_APinDescription[ulPin].ulPort].PINCFG[g_APinDescription[ulPin].ulPin].reg=(uint8_t)(PORT_PINCFG_INEN|PORT_PINCFG_PULLEN) ;
-      PORT->Group[g_APinDescription[ulPin].ulPort].DIRCLR.reg = (uint32_t)(1<<g_APinDescription[ulPin].ulPin) ;
+      PORT->Group[port].PINCFG[pin].reg = (uint8_t) (PORT_PINCFG_INEN | PORT_PINCFG_PULLEN);
+      PORT->Group[port].DIRCLR.reg = pinMask;
 
       // Enable pull level (cf '22.6.3.2 Input Configuration' and '22.8.7 Data Output Value Set')
-      PORT->Group[g_APinDescription[ulPin].ulPort].OUTSET.reg = (uint32_t)(1<<g_APinDescription[ulPin].ulPin) ;
+      PORT->Group[port].OUTSET.reg = pinMask;
     break;
 
     case INPUT_PULLDOWN:
       // Set pin to input mode with pull-down resistor enabled
-      PORT->Group[g_APinDescription[ulPin].ulPort].PINCFG[g_APinDescription[ulPin].ulPin].reg=(uint8_t)(PORT_PINCFG_INEN|PORT_PINCFG_PULLEN) ;
-      PORT->Group[g_APinDescription[ulPin].ulPort].DIRCLR.reg = (uint32_t)(1<<g_APinDescription[ulPin].ulPin) ;
+      PORT->Group[port].PINCFG[pin].reg = (uint8_t) (PORT_PINCFG_INEN | PORT_PINCFG_PULLEN);
+      PORT->Group[port].DIRCLR.reg = pinMask;
 
       // Enable pull level (cf '22.6.3.2 Input Configuration' and '22.8.6 Data Output Value Clear')
-      PORT->Group[g_APinDescription[ulPin].ulPort].OUTCLR.reg = (uint32_t)(1<<g_APinDescription[ulPin].ulPin) ;
+      PORT->Group[port].OUTCLR.reg = pinMask;
     break;
 
     case OUTPUT:
       // enable input, to support reading back values, with pullups disabled
-      PORT->Group[g_APinDescription[ulPin].ulPort].PINCFG[g_APinDescription[ulPin].ulPin].reg=(uint8_t)(PORT_PINCFG_INEN) ;
+      PORT->Group[port].PINCFG[pin].reg = (uint8_t) (PORT_PINCFG_INEN | PORT_PINCFG_DRVSTR);
 
       // Set pin to output mode
-      PORT->Group[g_APinDescription[ulPin].ulPort].DIRSET.reg = (uint32_t)(1<<g_APinDescription[ulPin].ulPin) ;
+      PORT->Group[port].DIRSET.reg = pinMask;
     break;
 
     default:

cores/arduino/wiring_digital.h

@@ -25,6 +25,8 @@
 
 #include "WVariant.h"
 
+typedef int PinStatus;
+
 /**
  * \brief Configures the specified pin to behave either as an input or an output. See the description of digital pins for details.
  *

cores/arduino/wiring_private.c

@@ -107,7 +107,7 @@ int pinPeripheral( uint32_t ulPin, EPioType ulPeripheral )
         // Set new muxing
         PORT->Group[g_APinDescription[ulPin].ulPort].PMUX[g_APinDescription[ulPin].ulPin >> 1].reg = temp|PORT_PMUX_PMUXO( ulPeripheral ) ;
         // Enable port mux
-        PORT->Group[g_APinDescription[ulPin].ulPort].PINCFG[g_APinDescription[ulPin].ulPin].reg |= PORT_PINCFG_PMUXEN ;
+        PORT->Group[g_APinDescription[ulPin].ulPort].PINCFG[g_APinDescription[ulPin].ulPin].reg |= PORT_PINCFG_PMUXEN | PORT_PINCFG_DRVSTR;
       }
       else // even pin
       {
@@ -115,7 +115,7 @@ int pinPeripheral( uint32_t ulPin, EPioType ulPeripheral )
 
         temp = (PORT->Group[g_APinDescription[ulPin].ulPort].PMUX[g_APinDescription[ulPin].ulPin >> 1].reg) & PORT_PMUX_PMUXO( 0xF ) ;
         PORT->Group[g_APinDescription[ulPin].ulPort].PMUX[g_APinDescription[ulPin].ulPin >> 1].reg = temp|PORT_PMUX_PMUXE( ulPeripheral ) ;
-        PORT->Group[g_APinDescription[ulPin].ulPort].PINCFG[g_APinDescription[ulPin].ulPin].reg |= PORT_PINCFG_PMUXEN ; // Enable port mux
+        PORT->Group[g_APinDescription[ulPin].ulPort].PINCFG[g_APinDescription[ulPin].ulPin].reg |= PORT_PINCFG_PMUXEN | PORT_PINCFG_DRVSTR ; // Enable port mux
       }
 #endif
     break ;

drivers/prewin10/adafruit_circuit_playground_express.inf

@@ -46,6 +46,14 @@ StartType=3
 ErrorControl=1
 ServiceBinary=%12%\%DRIVERFILENAME%.sys
 
+[NullInstall.nt]
+; nothing to do for a null driver
+
+[NullInstall.nt.Services]
+; null driver has no service and no service name
+AddService=, 0x00000002
+
+
 ;------------------------------------------------------------------------------
 ;  Vista-64bit Sections
 ;------------------------------------------------------------------------------
@@ -73,6 +81,13 @@ StartType=3
 ErrorControl=1
 ServiceBinary=%12%\%DRIVERFILENAME%.sys
 
+[NullInstall.NTamd64]
+; nothing to do for a null driver
+
+[NullInstall.NTamd64.Services]
+; null driver has no service and no service name
+AddService=, 0x00000002
+
 
 ;------------------------------------------------------------------------------
 ;  Vendor and Product ID Definitions
@@ -87,14 +102,14 @@ ServiceBinary=%12%\%DRIVERFILENAME%.sys
 [SourceDisksNames]
 [DeviceList]
 "%DESCRIPTION% UF2 Bootloader (0018:00) BSP"=DriverInstall, USB\VID_239A&PID_0018&MI_00
-"%DESCRIPTION% UF2 WebUSB dummy (0018:04) BSP"=DriverInstall, USB\VID_239A&PID_0018&MI_00
+"%DESCRIPTION% UF2 WebUSB dummy (0018:04) BSP"=NullInstall, USB\VID_239A&PID_0018&MI_04
 "%DESCRIPTION% (0019:00) BSP"=DriverInstall, USB\VID_239A&PID_0019&MI_00
 "%DESCRIPTION% Arduino (8018:00) BSP"=DriverInstall, USB\VID_239A&PID_8018&MI_00
 "%DESCRIPTION% CircuitPython (8019:00) BSP"=DriverInstall, USB\VID_239A&PID_8019&MI_00
 
 [DeviceList.NTamd64]
 "%DESCRIPTION% UF2 Bootloader (0018:00) BSP"=DriverInstall, USB\VID_239A&PID_0018&MI_00
-"%DESCRIPTION% UF2 WebUSB dummy (0018:04) BSP"=DriverInstall, USB\VID_239A&PID_0018&MI_00
+"%DESCRIPTION% UF2 WebUSB dummy (0018:04) BSP"=NullInstall, USB\VID_239A&PID_0018&MI_04
 "%DESCRIPTION% (0019:00) BSP"=DriverInstall, USB\VID_239A&PID_0019&MI_00
 "%DESCRIPTION% Arduino (8018:00) BSP"=DriverInstall, USB\VID_239A&PID_8018&MI_00
 "%DESCRIPTION% CircuitPython (8019:00) BSP"=DriverInstall, USB\VID_239A&PID_8019&MI_00

keywords.txt

@@ -1,2 +1,3 @@
 SerialGSM	KEYWORD1
+SerialSARA	KEYWORD1
 INPUT_PULLDOWN	LITERAL1	Constants	RESERVED_WORD_2

libraries/Adafruit_TinyUSB_Arduino

@@ -0,0 +1 @@
+Subproject commit c953968c468218d8968138b5ed8482fa565373df

libraries/Adafruit_ZeroDMA

@@ -0,0 +1 @@
+Subproject commit acc5dadb458b2c329757a61dc4f18dda945a0c36

libraries/CI_Tests/CI_Tests.h

@@ -0,0 +1 @@
+// fake empty header file to make Arduino IDE happy

libraries/CI_Tests/examples/test_cmsis_fast_rfft/test_cmsis_fast_rfft.ino

@@ -0,0 +1,12 @@
+#include <arm_math.h>
+
+arm_rfft_fast_instance_f32 plan;
+
+void setup() {
+  arm_rfft_fast_init_f32(&plan, 256);
+}
+
+void loop() {
+    float in[256] = { 0 }, out[256] = { 0 };
+    arm_rfft_fast_f32(&plan, in, out, 0);
+}

libraries/I2S/src/I2S.cpp

@@ -37,6 +37,12 @@ static I2SDevice_SAMD21G18x i2sd(*I2S);
 
 #include "I2S.h"
 
+#ifdef USE_TINYUSB
+// For Serial when selecting TinyUSB
+#include <Adafruit_TinyUSB.h>
+#endif
+
+
 int I2SClass::_beginCount = 0;
 
 I2SClass::I2SClass(uint8_t deviceIndex, uint8_t clockGenerator, uint8_t sdPin, uint8_t sckPin, uint8_t fsPin) :

libraries/SAMD_AnalogCorrection/src/SAMD_AnalogCorrection.cpp

@@ -19,6 +19,11 @@
 
 #include "SAMD_AnalogCorrection.h"
 
+#ifdef USE_TINYUSB
+// For Serial when selecting TinyUSB
+#include <Adafruit_TinyUSB.h>
+#endif
+
 void analogReadCorrection (int offset, uint16_t gain)
 {
   Adc *adc;

libraries/SDU/extras/SDUBoot/build.sh

@@ -28,4 +28,5 @@ buildSDUBootSketch "arduino:samd:mkrfox1200" "$OUTPUT_PATH/mkrfox1200.h"
 buildSDUBootSketch "arduino:samd:mkrgsm1400" "$OUTPUT_PATH/mkrgsm1400.h"
 buildSDUBootSketch "arduino:samd:mkrwan1300" "$OUTPUT_PATH/mkrwan1300.h"
 buildSDUBootSketch "arduino:samd:mkrwifi1010" "$OUTPUT_PATH/mkrwifi1010.h"
+buildSDUBootSketch "arduino:samd:mkrnb1500" "$OUTPUT_PATH/mkrnb1500.h"
 buildSDUBootSketch "arduino:samd:mzero_bl" "$OUTPUT_PATH/mzero.h"

libraries/SDU/src/SDU.cpp

@@ -36,6 +36,8 @@ unsigned char sduBoot[0x4000] = {
   #include "boot/mkrwan1300.h"
 #elif defined(ARDUINO_SAMD_MKRWIFI1010)
   #include "boot/mkrwifi1010.h"
+#elif defined(ARDUINO_SAMD_MKRNB1500)
+  #include "boot/mkrnb1500.h"
 #elif defined(ARDUINO_SAM_ZERO)
   #include "boot/mzero.h"
 #else