esp32/boards/UM_FEATHERS3NEO: Add FeatherS3 Neo board definition.

Signed-off-by: Seon Rozenblum <seon@unexpectedmaker.com>

ports/esp32/boards/UM_FEATHERS3NEO/board.json

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+{
+    "deploy": [
+        "deploy.md"
+    ],
+    "docs": "",
+    "features": [
+        "BLE",
+        "Battery Charging",
+        "External Flash",
+        "External RAM",
+        "Feather",
+        "JST-SH",
+        "RGB LED",
+        "USB-C",
+        "WiFi"
+    ],
+    "features_non_filterable": [],
+    "images": [
+        "unexpectedmaker_feathers3_neo.jpg"
+    ],
+    "mcu": "esp32s3",
+    "product": "FeatherS3 Neo",
+    "thumbnail": "",
+    "url": "https://esp32s3.com/feathers3neo.html",
+    "vendor": "Unexpected Maker"
+}

ports/esp32/boards/UM_FEATHERS3NEO/board.md

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+The following files are firmware for the FeatherS3 Neo.

ports/esp32/boards/UM_FEATHERS3NEO/deploy.md

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+Program your board using the latest version of the esptool.py program, found [here](https://github.com/espressif/esptool).
+
+To flash or erase your FeatherS3 Neo, you have to first put it into download mode.
+To do this, follow these steps:
+
+- Press and hold the [BOOT] button
+- Press and release the [RESET] button
+- Release the [BOOT] button
+
+Now the board is in download mode and the native USB will have enumerated as a serial device.
+
+If you are putting MicroPython on your board for the first time then you should
+first erase the entire flash using:
+
+### Linux
+```bash
+esptool.py --chip esp32s3 --port /dev/ttyACM0 erase_flash
+```
+
+### Mac
+Please do a `ls /dev/cu.usbm*` to determine the port your board has enumerated as.
+```bash
+esptool.py --chip esp32s3 --port /dev/cu.usbmodem01 erase_flash
+```
+
+### Windows
+Change (X) to whatever COM port is being used by the board
+```bash
+esptool --chip esp32s3 --port COM(X) erase_flash
+```
+
+Now download the version of the firmware you would like to install from the options below,
+then use the following command to program the firmware starting at address 0x0,
+remembering to replace `feathers3neo-micropython-firmware-version.bin` with the name of
+the firmware you just downloaded:
+
+### Linux
+```bash
+esptool.py --chip esp32s3 --port /dev/ttyACM0 write_flash -z 0x0 feathers3neo-micropython-firmware-version.bin
+```
+
+### Mac
+Please do a `ls /dev/cu.usbm*` to determine the port your board has enumerated as.
+```bash
+esptool.py --chip esp32s3 --port /dev/cu.usbmodem01 write_flash -z 0x0 feathers3neo-micropython-firmware-version.bin
+```
+
+### Windows
+Change (X) to whatever COM port is being used by the board
+```bash
+esptool --chip esp32s3 --port COM(X) write_flash -z 0x0 feathers3neo-micropython-firmware-version.bin
+```

ports/esp32/boards/UM_FEATHERS3NEO/manifest.py

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+include("$(PORT_DIR)/boards/manifest.py")
+freeze("modules")

ports/esp32/boards/UM_FEATHERS3NEO/modules/feathers3neo.py

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+# FeatherS3 Neo MicroPython Helper Library
+# MIT license; Copyright (c) 2024 Seon Rozenblum - Unexpected Maker
+#
+# Project home:
+# http://esp32s3.com
+
+# Import required libraries
+from micropython import const
+from machine import Pin, ADC
+import time
+
+# FeatherS3 Hardware Pin Assignments
+
+# Sense Pins
+VBUS_SENSE = const(15)
+VBAT_SENSE = const(2)
+
+# LDO2 & Other Pins
+LDO2 = const(39)
+LED = const(13)
+AMB_LIGHT = const(4)
+
+# RGB LED Pins
+RGB_DATA = const(40)
+RGB_PWR = const(39)
+
+# RGB MATRIX LED Pins
+RGB_MATRIX_DATA = const(16)
+RGB_MATRIX_PWR = const(39)
+
+# SPI
+SPI_MOSI = const(35)
+SPI_MISO = const(37)
+SPI_CLK = const(36)
+
+# I2C
+I2C_SDA = const(8)
+I2C_SCL = const(9)
+
+# Helper functions
+
+
+# LED & Ambient Light Sensor control
+def led_set(state):
+    """Set the state of the BLUE LED on IO13"""
+    l = Pin(LED, Pin.OUT)
+    l.value(state)
+
+
+def led_blink():
+    """Toggle the BLUE LED on IO13"""
+    l = Pin(LED, Pin.OUT)
+    l.value(not l.value())
+
+
+# Create ADC and set attenuation and return the ambient light value from the onboard sensor
+def get_amb_light():
+    """Get Ambient Light Sensor reading"""
+    adc = ADC(Pin(AMB_LIGHT))
+    adc.atten(ADC.ATTN_11DB)
+    return adc.read()
+
+
+def set_ldo2_power(state):
+    """
+    Enable or Disable power to the second LDO, which is the LDO that powers the following items
+    RGB Matrix, RGB status LED, Ambient light Sensor.
+    This is ON by default and will automatically shut down when the ESP32 going into deep sleep.
+    """
+    Pin(LDO2, Pin.OUT).value(state)
+
+
+def get_battery_voltage():
+    """
+    Returns the current battery voltage. If no battery is connected, returns 4.2V which is the charge voltage
+    This is an approximation only, but useful to detect if the charge state of the battery is getting low.
+    """
+    adc = ADC(Pin(VBAT_SENSE))  # Assign the ADC pin to read
+    # Max voltage on ADC input will be 4.2V divided by R2 (442K) & R5 (160K), 4.2 / (160+442) * 160 = 1.1163V
+    adc.atten(ADC.ATTN_2_5DB)  # Needs 2.5DB attenuation to read a max voltage of 1.1163V
+    # Use read_uv() to get ADC reading as this will use the on-chip calibration data
+    measuredvbat = adc.read_uv() / 1000000  # Read micovolts and convert to volts
+    measuredvbat *= 3.7624  # Multiply by ratio of battery voltage to ADC pin voltage: 4.2/1.1163
+    return round(measuredvbat, 2)
+
+
+def get_vbus_present():
+    """Detect if VBUS (5V) power source is present"""
+    return Pin(VBUS_SENSE, Pin.IN).value() == 1
+
+
+# NeoPixel rainbow colour wheel
+def rgb_color_wheel(wheel_pos):
+    """Color wheel to allow for cycling through the rainbow of RGB colors."""
+    wheel_pos = wheel_pos % 255
+
+    if wheel_pos < 85:
+        return 255 - wheel_pos * 3, 0, wheel_pos * 3
+    elif wheel_pos < 170:
+        wheel_pos -= 85
+        return 0, wheel_pos * 3, 255 - wheel_pos * 3
+    else:
+        wheel_pos -= 170
+        return wheel_pos * 3, 255 - wheel_pos * 3, 0

ports/esp32/boards/UM_FEATHERS3NEO/mpconfigboard.cmake

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+set(IDF_TARGET esp32s3)
+
+set(SDKCONFIG_DEFAULTS
+    boards/sdkconfig.base
+    ${SDKCONFIG_IDF_VERSION_SPECIFIC}
+    boards/sdkconfig.usb
+    boards/sdkconfig.ble
+    boards/sdkconfig.240mhz
+    boards/sdkconfig.spiram_sx
+    boards/UM_FEATHERS3NEO/sdkconfig.board
+)
+
+set(MICROPY_FROZEN_MANIFEST ${MICROPY_BOARD_DIR}/manifest.py)

ports/esp32/boards/UM_FEATHERS3NEO/mpconfigboard.h

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+#define MICROPY_HW_BOARD_NAME               "FeatherS3 Neo"
+#define MICROPY_HW_MCU_NAME                 "ESP32-S3"
+#define MICROPY_PY_NETWORK_HOSTNAME_DEFAULT "FeatherS3 Neo"
+
+#define MICROPY_HW_I2C0_SCL                 (9)
+#define MICROPY_HW_I2C0_SDA                 (8)
+
+#define MICROPY_HW_SPI1_MOSI                (35)
+#define MICROPY_HW_SPI1_MISO                (37)
+#define MICROPY_HW_SPI1_SCK                 (36)

ports/esp32/boards/UM_FEATHERS3NEO/pins.csv

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+AMB_LIGHT,GPIO4
+I2C_SCL,GPIO9
+I2C_SDA,GPIO8
+LDO2_PWR,GPIO39
+LED_BLUE,GPIO13
+SPI_MOSI,GPIO35
+SPI_SCK,GPIO36
+SPI_MISO,GPIO37
+RGB_DATA,GPIO40
+RGB_PWR,GPIO39
+RGB_MATRIX_DATA,GPIO16
+RGB_MATRIX_PWR,GPIO39
+UART0_TX,GPIO43
+UART0_RX,GPIO44
+VBAT_SENSE,GPIO2
+VBUS_SENSE,GPIO15

ports/esp32/boards/UM_FEATHERS3NEO/sdkconfig.board

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+CONFIG_ESPTOOLPY_FLASHMODE_QIO=y
+CONFIG_ESPTOOLPY_FLASHFREQ_80M=y
+CONFIG_ESPTOOLPY_AFTER_NORESET=y
+
+CONFIG_SPIRAM_MEMTEST=
+CONFIG_ESPTOOLPY_FLASHSIZE_4MB=
+CONFIG_ESPTOOLPY_FLASHSIZE_8MB=y
+CONFIG_ESPTOOLPY_FLASHSIZE_16MB=
+CONFIG_PARTITION_TABLE_CUSTOM=y
+CONFIG_PARTITION_TABLE_CUSTOM_FILENAME="partitions-8MiB.csv"
+
+CONFIG_LWIP_LOCAL_HOSTNAME="UMFeatherS3Neo"
+
+CONFIG_TINYUSB_DESC_CUSTOM_VID=0x303A
+CONFIG_TINYUSB_DESC_CUSTOM_PID=0x81FC
+CONFIG_TINYUSB_DESC_BCD_DEVICE=0x0100
+CONFIG_TINYUSB_DESC_USE_ESPRESSIF_VID=n
+CONFIG_TINYUSB_DESC_USE_DEFAULT_PID=n
+CONFIG_TINYUSB_DESC_MANUFACTURER_STRING="Unexpected Maker"
+CONFIG_TINYUSB_DESC_PRODUCT_STRING="FeatherS3 Neo"
+CONFIG_TINYUSB_DESC_SERIAL_STRING="_fs3neo_"