Seeed Seeeduino XIAO

The Seeed Seeeduino XIAO is a tiny ARM development board based on the Atmel ATSAMD21G18 family of SoC.

Interfaces

Pin	Hardware pin	Alternative names	PWM
`D0`	`PA02`	`A0`
`D1`	`PA04`	`A1`	`TCC0` (channel 0)
`D2`	`PA10`	`A2`, `I2S_SCK_PIN`	`TCC1` (channel 0), `TCC0` (channel 2)
`D3`	`PA11`	`A3`	`TCC1` (channel 1), `TCC0` (channel 3)
`D4`	`PA08`	`A4`, `SDA_PIN`, `I2S_SD_PIN`	`TCC0` (channel 0), `TCC1` (channel 2)
`D5`	`PA09`	`A5`, `SCL_PIN`	`TCC0` (channel 1), `TCC1` (channel 3)
`D6`	`PB08`	`A6`, `UART_TX_PIN`
`D7`	`PB09`	`A7`, `UART_RX_PIN`
`D8`	`PA07`	`A8`, `SPI0_SCK_PIN`	`TCC1` (channel 1)
`D9`	`PA05`	`A9`, `SPI0_SDI_PIN`	`TCC0` (channel 1)
`D10`	`PA06`	`A10`, `SPI0_SDO_PIN`	`TCC1` (channel 0)
`LED`	`PA17`		`TCC2` (channel 1), `TCC0` (channel 3)
`LED_RXL`	`PA18`	`LED2`	`TCC0` (channel 2)
`LED_TXL`	`PA19`	`LED3`	`TCC0` (channel 3)
`USBCDC_DM_PIN`	`PA24`		`TCC1` (channel 2)
`USBCDC_DP_PIN`	`PA25`		`TCC1` (channel 3)

The XIAO comes with the UF2 bootloader already installed.

Plug your XIAO into your computer’s USB port.
Flash your TinyGo program to the board using this command:
```
tinygo flash -target=xiao [PATH TO YOUR PROGRAM]
```
The XIAO board should restart and then begin running your program.

If you have troubles getting your XIAO board to receive code, try this:

tinygo flash -target=xiao [PATH TO YOUR PROGRAM]

Once you have updated your XIAO board the first time, after that you should be able to flash it entirely from the command line.

You can use the USB port to the XIAO as a serial port. UART0 refers to this connection.