Adafruit Grand Central M4 Express

Caution

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Tip

When using this board with RIOT, set the BOARD variable to adafruit-grand-central-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-grand-central-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 Grand Central M4 Express

General information

The main features of the board are:

• ATSAMD51 Cortex M4 running at 120 MHz
• Hardware DSP and floating point support
• 1 MiB Flash
• 256 KiB RAM
• external 8 MB QSPI Flash storage
• 32-bit, 3.3V logic and power
• Micro SD Card slot connected to SPI
• native USB

Pinout

Links

• Overview
• Schematics

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.

Accessing STDIO

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