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:
# On Linux/macOS cd $ZEPHYR_BASE/samples/hello_world mkdir build && cd build # On Windows cd %ZEPHYR_BASE%\samples\hello_world mkdir build & cd build cmake -GNinja -DBOARD=arduino_zero .. ninja
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:
# On Linux/macOS cd $ZEPHYR_BASE/samples/hello_world mkdir build && cd build # On Windows cd %ZEPHYR_BASE%\samples\hello_world mkdir build & cd build cmake -GNinja -DBOARD=arduino_zero .. ninja flash
You should see “Hello World! arm” in your terminal.