xiao-ble: initial support

src/machine/board_xiao-ble.go

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+//go:build xiao_ble
+// +build xiao_ble
+
+// This file contains the pin mappings for the Seeed XIAO BLE nRF52840 [Sense] boards.
+//
+// Seeed XIAO BLE is an ultra-small size, ultra-low power Bluetooth development board based on the Nordic nRF52840.
+// It features an onboard Bluetooth antenna, onboard battery charging chip, and 21*17.5mm thumb size, which makes it ideal for IoT projects.
+//
+// Seeed XIAO BLE nRF52840 Sense is a tiny Bluetooth LE development board designed for IoT and AI applications.
+// It features an onboard antenna, 6 Dof IMU, microphone, all of which make it an ideal board to run AI using TinyML and TensorFlow Lite.
+//
+// SoftDevice (s140v7) is pre-flashed on this board already.
+// See https://github.com/tinygo-org/bluetooth
+//
+// - https://www.seeedstudio.com/Seeed-XIAO-BLE-nRF52840-p-5201.html
+// - https://www.seeedstudio.com/Seeed-XIAO-BLE-Sense-nRF52840-p-5253.html
+//
+// - https://wiki.seeedstudio.com/XIAO_BLE/
+// - https://github.com/Seeed-Studio/ArduinoCore-mbed/tree/master/variants/SEEED_XIAO_NRF52840_SENSE
+//
+package machine
+
+const HasLowFrequencyCrystal = true
+
+// Digital Pins
+const (
+	D0  Pin = P0_02
+	D1  Pin = P0_03
+	D2  Pin = P0_28
+	D3  Pin = P0_29
+	D4  Pin = P0_04
+	D5  Pin = P0_05
+	D6  Pin = P1_11
+	D7  Pin = P1_12
+	D8  Pin = P1_13
+	D9  Pin = P1_14
+	D10 Pin = P1_15
+)
+
+// Analog pins
+const (
+	A0 Pin = P0_02
+	A1 Pin = P0_03
+	A2 Pin = P0_28
+	A3 Pin = P0_29
+	A4 Pin = P0_04
+	A5 Pin = P0_05
+)
+
+// Onboard LEDs
+const (
+	LED       = LED_CHG
+	LED1      = LED_RED
+	LED2      = LED_GREEN
+	LED3      = LED_BLUE
+	LED_CHG   = P0_17
+	LED_RED   = P0_26
+	LED_GREEN = P0_30
+	LED_BLUE  = P0_06
+)
+
+// UART0 pins
+const (
+	UART_RX_PIN = P1_12
+	UART_TX_PIN = P1_11
+)
+
+// I2C pins
+const (
+	// Defaults to internal
+	SDA_PIN = SDA1_PIN
+	SCL_PIN = SCL1_PIN
+
+	// I2C0 (external) pins
+	SDA0_PIN = P0_04
+	SCL0_PIN = P0_05
+
+	// I2C1 (internal) pins
+	SDA1_PIN = P0_07
+	SCL1_PIN = P0_27
+)
+
+// SPI pins
+const (
+	SPI0_SCK_PIN = P1_13
+	SPI0_SDO_PIN = P1_14
+	SPI0_SDI_PIN = P1_15
+)
+
+// Peripherals
+const (
+	LSM_PWR = P1_08 // IMU (LSM6DS3TR) power
+	LSM_INT = P0_11 // IMU (LSM6DS3TR) interrupt
+
+	MIC_PWR = P1_10 // Microphone (MSM261D3526H1CPM) power
+	MIC_CLK = P1_00
+	MIC_DIN = P0_16
+)
+
+// USB CDC identifiers
+const (
+	usb_STRING_PRODUCT      = "XIAO nRF52840 Sense"
+	usb_STRING_MANUFACTURER = "Seeed"
+)
+
+var (
+	usb_VID uint16 = 0x2886
+	usb_PID uint16 = 0x0045
+)
+
+var (
+	DefaultUART = UART0
+)

targets/xiao-ble.json

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+{
+	"inherits": ["nrf52840"],
+	"build-tags": ["xiao_ble", "softdevice", "s140v7"],
+	"serial": "uart",
+	"serial-port": ["acm:2886:8045", "acm:2886:0045"],
+	"flash-method": "msd",
+	"msd-volume-name": "XIAO-SENSE",
+	"msd-firmware-name": "firmware.uf2",
+	"binary-format": "uf2",
+	"uf2-family-id": "0xADA52840",
+	"linkerscript": "targets/xiao-ble.ld"
+}

targets/xiao-ble.ld

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+
+/*
+  See also 
+  https://github.com/Seeed-Studio/ArduinoCore-mbed/blob/master/variants/SEEED_XIAO_NRF52840_SENSE/linker_script.ld
+*/
+MEMORY
+{
+    FLASH_TEXT (rx) : ORIGIN = 0x27000, LENGTH = 0xED000 - 0x27000
+    RAM (rwx) : ORIGIN = 0x20006000, LENGTH = 0x3A000
+}
+
+_stack_size = 4K + __softdevice_stack;
+
+/* This value is needed by the Nordic SoftDevice. */
+__app_ram_base = ORIGIN(RAM);
+__softdevice_stack = DEFINED(__softdevice_stack) ? __softdevice_stack : 0;
+
+INCLUDE "targets/arm.ld"