The Arduino Zero is a maker-friendly development board with Atmel’s Embedded Debugger (EDBG), which provides a full debug interface without the need for additional hardware.
- ATSAMD21G18A ARM Cortex-M0+ processor at 48 MHz
- 32.768 kHz crystal oscillator
- 256 KiB flash memory and 32 KiB of RAM
- 3 user LEDs
- One reset button
- On-board USB based EDBG unit with serial console
- Native USB port
The arduino_zero board configuration supports the following hardware features:
|NVIC||on-chip||nested vector interrupt controller|
|Flash||on-chip||Can be used with NFFS to store files|
|SPI||on-chip||Serial Peripheral Interface ports|
Other hardware features are not currently supported by Zephyr.
The default configuration can be found in the Kconfig boards/arm/arduino_zero/arduino_zero_defconfig.
Connections and IOs¶
The SAMD21 MCU is configured to use the 32.768 kHz external oscillator with the on-chip PLL generating the 48 MHz system clock. The internal APB and GCLK unit are set up in the same way as the upstream Arduino libraries.
The SAMD21 MCU has 6 SERCOM based USARTs. One of the USARTs (SERCOM5) is connected to the onboard Atmel Embedded Debugger (EDBG). SERCOM0 is available on the D0/D1 pins.
The SAMD21 MCU has 6 SERCOM based SPIs. On the Arduino Zero, SERCOM4 is available on the 6 pin connector at the edge of the board.
Programming and Debugging¶
The Arduino Zero comes with a Atmel Embedded Debugger (EDBG). This provides a debug interface to the SAMD21 chip and is supported by OpenOCD.
Build the Zephyr kernel and the Hello World sample application:
west build -b arduino_zero samples/hello_world
Using CMake and ninja:
cmake -B build -GNinja -DBOARD=arduino_zero samples/hello_world ninja -C build
Connect the Arduino Zero to your host computer using the USB debug port.
Run your favorite terminal program to listen for output. Under Linux the terminal should be
/dev/ttyACM0. For example:
$ minicom -D /dev/ttyACM0 -o
The -o option tells minicom not to send the modem initialization string. Connection should be configured as follows:
- Speed: 115200
- Data: 8 bits
- Parity: None
- Stop bits: 1
To flash an image:
Using CMake and ninja:
cmake -B build -GNinja -DBOARD=arduino_zero samples/hello_world ninja -C build flash
You should see “Hello World! arm” in your terminal.