Adafruit Feather M0

The Adafruit Feather M0 is a tiny ARM development board based on the Atmel ATSAMD21G18 family of SoC.

Interfaces

Pin	Hardware pin	Alternative names	PWM
`D0`	`PA11`		`TCC1` (channel 1), `TCC0` (channel 3)
`D1`	`PA10`	`I2S_SCK_PIN`	`TCC1` (channel 0), `TCC0` (channel 2)
`D3`	`PA09`		`TCC0` (channel 1), `TCC1` (channel 3)
`D4`	`PA08`	`I2S_SD_PIN`	`TCC0` (channel 0), `TCC1` (channel 2)
`D5`	`PA15`		`TCC0` (channel 1)
`D6`	`PA20`		`TCC0` (channel 2)
`D8`	`PA06`		`TCC1` (channel 0)
`D9`	`PA07`		`TCC1` (channel 1)
`D10`	`PA18`	`UART_TX_PIN`	`TCC0` (channel 2)
`D11`	`PA16`	`UART_RX_PIN`	`TCC2` (channel 0), `TCC0` (channel 2)
`D12`	`PA19`		`TCC0` (channel 3)
`D13`	`PA17`	`LED`	`TCC2` (channel 1), `TCC0` (channel 3)
`A0`	`PA02`
`A1`	`PB08`
`A2`	`PB09`
`A3`	`PA04`		`TCC0` (channel 0)
`A4`	`PA05`		`TCC0` (channel 1)
`A5`	`PB02`
`USBCDC_DM_PIN`	`PA24`		`TCC1` (channel 2)
`USBCDC_DP_PIN`	`PA25`		`TCC1` (channel 3)
`SDA_PIN`	`PA22`		`TCC0` (channel 0)
`SCL_PIN`	`PA23`		`TCC0` (channel 1)
`SPI0_SCK_PIN`	`PB11`		`TCC0` (channel 1)
`SPI0_SDO_PIN`	`PB10`		`TCC0` (channel 0)
`SPI0_SDI_PIN`	`PA12`		`TCC2` (channel 0), `TCC0` (channel 2)

The Feather M0 comes with the UF2 bootloader already installed.

Plug your Feather M0 into your computer’s USB port.
Flash your TinyGo program to the board using this command:
```
tinygo flash -target=feather-m0 [PATH TO YOUR PROGRAM]
```
The Feather M0 board should restart and then begin running your program.

If you have troubles getting your Feather M0 board to receive code, try this:

Press the “RESET” button on the board two times to get the Feather M0 board ready to receive code.
The Feather M0 board will appear to your computer like a USB drive.
Now try running the command as above:

tinygo flash -target=feather-m0 [PATH TO YOUR PROGRAM]

Once you have updated your Feather M0 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 Feather M0 as a serial port. UART0 refers to this connection.