Support for the Arduino Zero board.
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
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
