Adafruit Trinket M0

The Adafruit Trinket M0 is a tiny ARM development board based on the Atmel ATSAMD21E18 family of SoC.

Interfaces

Pin	Hardware pin	Alternative names	PWM
`D0`	`PA08`	`A2`, `SDA_PIN`, `I2S_SDO_PIN`	`TCC0` (channel 0), `TCC1` (channel 2)
`D1`	`PA02`	`A0`
`D2`	`PA09`	`A1`, `SPI0_SDI_PIN`, `SCL_PIN`	`TCC0` (channel 1), `TCC1` (channel 3)
`D3`	`PA07`	`A3`, `UART_RX_PIN`, `SPI0_SCK_PIN`	`TCC1` (channel 1)
`D4`	`PA06`	`A4`, `UART_TX_PIN`, `SPI0_SDO_PIN`	`TCC1` (channel 0)
`D13`	`PA10`	`LED`, `I2S_SCK_PIN`	`TCC1` (channel 0), `TCC0` (channel 2)
`USBCDC_DM_PIN`	`PA24`		`TCC1` (channel 2)
`USBCDC_DP_PIN`	`PA25`		`TCC1` (channel 3)

The Trinket M0 comes with the UF2 bootloader already installed.

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

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

Press the “RESET” button on the board two times to get the Trinket M0 board ready to receive code.
The Trinket M0 board will appear to your computer like a USB drive.

Now try running the tinygo flash command as above:

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

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

The DotStar LED on the Trinket M0 can be accessed using the APA102 driver via a software SPI on the PA01 and PA00 pins