Adafruit Metro M4 Express

Caution

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Tip

When using this board with RIOT, set the BOARD variable to adafruit-metro-m4-express in your Makefile. If you follow the standard RIOT project structure, your Makefile should look like this:

./Makefile

# name of your application
APPLICATION = hello-world

# Change this to your board if you want to build for a different board
BOARD ?= adafruit-metro-m4-express

# This has to be the absolute path to the RIOT base directory:
RIOTBASE ?= $(CURDIR)/RIOT

include $(RIOTBASE)/Makefile.include

Support for the Adafruit Metro M4 Express

General information

The main features of the board are:

• ATSAMD51 Cortex M4 running at 120 MHz
• Hardware DSP and floating point support
• 512 MiB Flash
• 192 KiB KiB RAM
• external 2 MiB QSPI Flash storage
• WS281x RGB LED (NeoPixel)
• 32-bit, 3.3V logic and power
• native USB

Pinout

Links

• Official Board Documentation

Schematics

Arduino Compatibility

The board is compatible with Shields for the Arduino UNO / Arduino Zero.

Warning: The SPI bus on D11/D12/D13 is only available when periph_uart is not used, as this pins are connected to the same SERCOM peripheral. This is board design flaw that we cannot work around unless resorting to desperate means such as bit-banging either the SPI bus or the UART interface.

Flash the board

The board is flashed using its on-board boot loader.

The process is automated in the usual make flash target.

If RIOT is already running on the board, it will automatically reset the CPU and enter the bootloader. If some other firmware is running or RIOT crashed, you need to enter the bootloader manually by double tapping the board’s reset button.

Readiness of the bootloader is indicated by LED pulsing in red.

Note: You may need to pass MOST_RECENT_PORT=0 and manually pass the PORT if you enter the bootloader by hand.

Accessing STDIO

The usual way to obtain a console on this board is using an emulated USB serial port.