Seeed Studio XIAO SAMD21 aka Seeeduino XIAO
The Seeed Seeeduino XIAO, which has been renamed to Seeed Studio XIAO SAMD21 is a tiny ARM development board based on the Atmel ATSAMD21G18 family of SoC.
Interfaces
| Interface | Hardware Supported | TinyGo Support |
|---|---|---|
| GPIO | YES | YES |
| UART | YES | YES |
| SPI | YES | YES |
| I2C | YES | YES |
| ADC | YES | YES |
| PWM | YES | YES |
| USBDevice | YES | YES |
Pins
| 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) |
Machine Package Docs
Documentation for the machine package for the Seeed Seeeduino XIAO
Flashing
UF2
The XIAO comes with the UF2 bootloader already installed.
CLI Flashing
-
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.
Troubleshooting
If you have troubles getting your XIAO board to receive code, try this:
- Short the “RST pins” two times to get the XIAO board ready to receive code.
- The XIAO board will appear to your computer like a USB drive.
- Now try running the command as above:
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.
Notes
You can use the USB port to the XIAO as a serial port. UART0 refers to this connection.