Adafruit Metro M4 Express AirLift
The Adafruit Metro M4 Express AirLift is an ARM development board based on the Atmel ATSAMD51J19 family of SoC that has Arduino shield compatible form factor, and a built-in EspressIf ESP32 Wi-Fi Co processor.
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 |
PA23 |
UART_RX_PIN |
TCC1 (channel 7), TCC0 (channel 3) |
D1 |
PA22 |
UART_TX_PIN |
TCC1 (channel 6), TCC0 (channel 2) |
D2 |
PB17 |
TCC3 (channel 1), TCC0 (channel 5) |
|
D3 |
PB16 |
TCC3 (channel 0), TCC0 (channel 4) |
|
D4 |
PB13 |
TCC3 (channel 1), TCC0 (channel 1) |
|
D5 |
PB14 |
TCC4 (channel 0), TCC0 (channel 2) |
|
D6 |
PB15 |
TCC4 (channel 1), TCC0 (channel 3) |
|
D7 |
PB12 |
TCC3 (channel 0), TCC0 (channel 0) |
|
D8 |
PA21 |
TCC1 (channel 5), TCC0 (channel 1) |
|
D9 |
PA20 |
TCC1 (channel 4), TCC0 (channel 0) |
|
D10 |
PA18 |
TCC1 (channel 2), TCC0 (channel 6) |
|
D11 |
PA19 |
SPI1_SDO_PIN |
TCC1 (channel 3), TCC0 (channel 7) |
D12 |
PA17 |
SPI1_SCK_PIN |
TCC1 (channel 1), TCC0 (channel 5) |
D13 |
PA16 |
LED, SPI1_SDI_PIN |
TCC1 (channel 0), TCC0 (channel 4) |
D40 |
PB22 |
WS2812 |
|
A0 |
PA02 |
||
A1 |
PA05 |
||
A2 |
PB06 |
||
A3 |
PB00 |
||
A4 |
PB08 |
||
A5 |
PB09 |
||
USBCDC_DM_PIN |
PA24 |
TCC2 (channel 2) |
|
USBCDC_DP_PIN |
PA25 |
TCC2 (channel 3) |
|
UART2_TX_PIN |
PA04 |
NINA_TX |
|
UART2_RX_PIN |
PA07 |
NINA_RX |
|
NINA_CS |
PA15 |
TCC2 (channel 1), TCC1 (channel 3) |
|
NINA_ACK |
PB04 |
NINA_CTS |
|
NINA_GPIO0 |
PB01 |
NINA_RTS |
|
NINA_RESETN |
PB05 |
||
SDA_PIN |
PB02 |
TCC2 (channel 2) |
|
SCL_PIN |
PB03 |
TCC2 (channel 3) |
|
SPI0_SCK_PIN |
PA13 |
NINA_SCK |
TCC0 (channel 7), TCC1 (channel 3) |
SPI0_SDO_PIN |
PA12 |
NINA_SDO |
TCC0 (channel 6), TCC1 (channel 2) |
SPI0_SDI_PIN |
PA14 |
NINA_SDI |
TCC2 (channel 0), TCC1 (channel 2) |
QSPI_SCK |
PB10 |
TCC0 (channel 4), TCC1 (channel 0) |
|
QSPI_CS |
PB11 |
TCC0 (channel 5), TCC1 (channel 1) |
|
QSPI_DATA0 |
PA08 |
TCC0 (channel 0), TCC1 (channel 4) |
|
QSPI_DATA1 |
PA09 |
TCC0 (channel 1), TCC1 (channel 5) |
|
QSPI_DATA2 |
PA10 |
TCC0 (channel 2), TCC1 (channel 6) |
|
QSPI_DATA3 |
PA11 |
TCC0 (channel 3), TCC1 (channel 7) |
Machine Package Docs
Documentation for the machine package for the Adafruit Metro M4 Airlift
Flashing
UF2
The Metro M4 Express comes with the UF2 bootloader already installed.
CLI Flashing
-
Plug your Metro M4 Express into your computer’s USB port.
-
Flash your TinyGo program to the board using this command:
tinygo flash -target=metro-m4-airlift [PATH TO YOUR PROGRAM] -
The Metro M4 Express board should restart and then begin running your program.
Troubleshooting
If you have troubles getting your Metro M4 Express board to receive code, try this:
-
Press the “RESET” button on the board two times to get the Metro M4 Express board ready to receive code.
-
The Metro M4 Express board will appear to your computer like a USB drive.
-
Now try running the command as above:
tinygo flash -target=metro-m4-airlift [PATH TO YOUR PROGRAM]
Once you have updated your Metro M4 Express 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 Metro M4 Express as a serial port. UART0 refers to this connection.
The Neopixel LED on the Metro M4 Express can be accessed using the WS2812 driver via the PB22 pin