SODAQ Autonomo

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When using this board with RIOT, set the BOARD variable to sodaq-autonomo 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 ?= sodaq-autonomo

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

include $(RIOTBASE)/Makefile.include

Support for the SODAQ Autonomo board.

Overview

The SODAQ Autonomo is a board by SODAQ featuring a ATSAMD21J18A. The SAMD21 is a ARM Cortex-M0+ micro-controller. It has 256Kb of flash memory and 32Kb of RAM.

The Autonomo is available from the SODAQ shop.

Hardware

sodaq-autonomo image

MCU

MCU	ATSAMD21J18A
Family	ARM Cortex-M0+
Vendor	Atmel
RAM	32Kb
Flash	256Kb
Frequency	up to 48MHz
FPU	no
Timers	6 (1x 16-bit, 2x 24-bit, 3x 32-bit)
ADCs	1x 12-bit (8 channels)
UARTs	max 6 (SERCOMs shared with SPI and I2C)
SPIs	max 6 (see UART)
I2Cs	max 6 (see UART)
Vcc	1.8V - 3.6V
Datasheet	Datasheet

User Interface

1 LED:

Device	PIN
LED0	PA19

Implementation Status

Please refer to this tracker to see which projects are work in progress and who is the contact person for this. Notice that the initial support for the Autonomo was based on samr21-xpro. At some point we will add a separate issue to track changes for this board.

Device	ID	Supported	Comments
MCU	samd21	partly	Energy saving modes not fully utilized
Low-level driver	GPIO	yes
	PWM	yes
	UART	yes	two UARTs by now
	I2C	yes
	SPI	yes
	ADC	yes	PA04 & PA05 disabled by default due to EDBG’s use of them for UART, can be enabled from `periph_conf.h`
	USB	no
	RTT	yes
	RTC	yes
	RNG	no	no HW module
	Timer	yes

Features of the board

Besides the SAMD21 the board has the following features:

Feature	Description
Compatibility	Arduino M0 compatible
Size	58.5 x 33.5 mm
Operating Voltage	3.3V
Digital I/O Pins	16, with 12 PWM, UART, SPI and TWI (I2C)
Analog Input Pins	6, 12-bit ADC channels
Analog Output Pins	10-bit DAC
External Interrupts	Available on all pins except pin 4
DC Current per I/O pin	7 mA
EEPROM	Up to 16KB by emulation
Clock Speed	48 MHz
Debug	Serial Wire Interface
Communications	Bee compatible slot for communication modules with software switchable power
Storage	16Mbit Dataflash Module and Micro SD card holder
Power	5V USB power and/or 3.7V LiPo battery
Power switch	Software switchable power for connected devices up to 1A
Charging	Solar charge controller, up to 500mA charge current
LED’s	Yellow charge LED and green LED on pin 13

Flashing the device

Use BOARD=sodaq-autonomo with the make command.
Example with hello-world application:

     make BOARD=sodaq-autonomo -C examples/basic/hello-world flash

Note: If the application crashes, automatic reflashing via USB, as explained above won’t be possible. In this case, the board must be set in bootloader mode by double tapping the reset button before running the flash command.

Accessing STDIO via UART

STDIO of RIOT is directly available over the USB port.

The TERM_DELAY environment variable can be used to add a delay (in second) before opening the serial terminal. The default value is 2s which should be enough in most of the situation.

Supported Toolchains

To build software for the autonomo 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