Arduino Zero

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

# name of your application
APPLICATION = hello-world

# Change this to your board if you want to build for a different board
BOARD ?= arduino-zero

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

include $(RIOTBASE)/Makefile.include

Support for the Arduino Zero board.

Overview

The Arduino Zero is a board by Arduino/Genuino featuring a ATSAMD21G18A. The SAMD21 is a ARM Cortex-M0+ micro-controller. It has 256KiB of flash memory and 32KiB of RAM.

This board is available here.

Hardware

arduino-zero

MCU

MCU	ATSAMD21G18A
Family	ARM Cortex-M0+
Vendor	Atmel
RAM	32KiB
Flash	256KiB
Frequency	up to 48MHz
FPU	no
Timers	6 (1x 16-bit, 2x 24-bit, 3x 32-bit)
ADCs	6x 12-bit channels)
UARTs	2
SPIs	max 6 (see UART)
I2Cs	max 6 (see UART)
Vcc	1.8V - 3.6V
Datasheet	Datasheet

User Interface

1 LED:

Device	PIN
LED0	PA17

Implementation Status

Notice that the initial support for the Arduino Zero was based on samr21-xpro and Sodaq Autonomo.

Device	ID	Supported	Comments
MCU	samd21	partly	Energy saving modes not fully utilized
Low-level driver	GPIO	yes
	PWM	to be tested
	UART	yes	two UARTs
	I2C	yes
	SPI	yes
	ADC	not implemented
	USB	no
	RTT	yes
	RTC	yes
	RNG	no	no HW module
	Timer	yes

Detailed information on the board can be found on the official web page.

Flashing the device

The standard method for flashing RIOT to the Arduino Zero is using OpenOCD. For this to work properly, you have to make sure to use a very recent version of OpenOCD. Arduino-IDE comes with openocd v0.9.0 which is known to work. Also Ubuntu 16.04 has openocd v0.9.0.

Refer to https://github.com/RIOT-OS/RIOT/wiki/OpenOCD for building OpenOCD and make sure “cmsis-dap” and “hidapi-libusb” are enabled.

Supported Toolchains

To build software for the Arduino Zero board we strongly recommend the usage of the GNU Tools for ARM Embedded Processors toolchain.

Known Issues / Problems

Stack sizes

The default stack sizes have not been tuned properly yet. If in doubt why your application crashes try increasing the default stack sizes and use ps to find out how much stack is being used. Tracked in https://github.com/RIOT-OS/RIOT/issues/2228