blob: c178c2e53771ac77617bb881411750e4f8c01b90 [file] [log] [blame]
.. _arduino_zero:
Arduino/Genuino Zero
####################
Overview
********
The Arduino Zero is a maker-friendly development board with
Atmels Embedded Debugger (EDBG), which provides a full
debug interface without the need for additional hardware.
.. image:: img/arduino_zero.jpg
:align: center
:alt: Arduino Zero
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
Supported Features
==================
The arduino_zero board configuration supports the following hardware
features:
+-----------+------------+------------------------------------------+
| Interface | Controller | Driver/Component |
+===========+============+==========================================+
| NVIC | on-chip | nested vector interrupt controller |
+-----------+------------+------------------------------------------+
| Flash | on-chip | Can be used with LittleFS to store files |
+-----------+------------+------------------------------------------+
| SYSTICK | on-chip | systick |
+-----------+------------+------------------------------------------+
| WDT | on-chip | Watchdog |
+-----------+------------+------------------------------------------+
| GPIO | on-chip | I/O ports |
+-----------+------------+------------------------------------------+
| PWM | on-chip | Pulse Width Modulation |
+-----------+------------+------------------------------------------+
| USART | on-chip | Serial ports |
+-----------+------------+------------------------------------------+
| SPI | on-chip | Serial Peripheral Interface ports |
+-----------+------------+------------------------------------------+
| USB | on-chip | USB device |
+-----------+------------+------------------------------------------+
| DAC | on-chip | Digital to analogue converter |
+-----------+------------+------------------------------------------+
Other hardware features are not currently supported by Zephyr.
The default configuration can be found in the Kconfig
:zephyr_file:`boards/arm/arduino_zero/arduino_zero_defconfig`.
Connections and IOs
===================
The `Arduino store`_ has detailed information about board
connections. Download the `Arduino Zero Schematic`_ for more detail.
System Clock
============
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.
Serial Port
===========
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.
PWM
===
The SAMD21 MCU has 3 TCC based PWM units with up to 4 outputs each and a period
of 24 bits or 16 bits. If :code:`CONFIG_PWM_SAM0_TCC` is enabled then LED0 is
driven by TCC2 instead of by GPIO.
SPI Port
========
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.
USB Device Port
===============
The SAMD21 MCU has a USB device port that can be used to communicate
with a host PC. See the :ref:`usb-samples` sample applications for
more, such as the :ref:`usb_cdc-acm` sample which sets up a virtual
serial port that echos characters back to the host PC.
DAC
===
The SAMD21 MCU has a single channel DAC with 10 bits of resolution. On the
Arduino Zero, the DAC is available on pin A0.
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.
Flashing
========
#. Build the Zephyr kernel and the :ref:`hello_world` sample application:
.. zephyr-app-commands::
:zephyr-app: samples/hello_world
:board: arduino_zero
:goals: build
:compact:
#. 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 :code:`/dev/ttyACM0`. For example:
.. code-block:: console
$ 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:
.. zephyr-app-commands::
:zephyr-app: samples/hello_world
:board: arduino_zero
:goals: flash
:compact:
You should see "Hello World! arm" in your terminal.
References
**********
.. target-notes::
.. _Arduino Store:
https://store.arduino.cc/genuino-zero
.. _Arduino Zero Schematic:
https://www.arduino.cc/en/uploads/Main/Zero_V1.0.pdf