151 lines
4.4 KiB
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151 lines
4.4 KiB
ReStructuredText
.. _arduino_zero:
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Arduino/Genuino Zero
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####################
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Overview
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********
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The Arduino Zero is a maker-friendly development board with
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Atmel’s Embedded Debugger (EDBG), which provides a full
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debug interface without the need for additional hardware.
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.. image:: img/arduino_zero.png
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:width: 500px
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:align: center
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:alt: Arduino Zero
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Hardware
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********
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- ATSAMD21G18A ARM Cortex-M0+ processor at 48 MHz
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- 32.768 kHz crystal oscillator
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- 256 KiB flash memory and 32 KiB of RAM
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- 3 user LEDs
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- One reset button
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- On-board USB based EDBG unit with serial console
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- Native USB port
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Supported Features
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==================
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The arduino_zero board configuration supports the following hardware
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features:
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+-----------+------------+--------------------------------------+
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| Interface | Controller | Driver/Component |
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+===========+============+======================================+
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| NVIC | on-chip | nested vector interrupt controller |
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+-----------+------------+--------------------------------------+
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| Flash | on-chip | Can be used with NFFS to store files |
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+-----------+------------+--------------------------------------+
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| SYSTICK | on-chip | systick |
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+-----------+------------+--------------------------------------+
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| WDT | on-chip | Watchdog |
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+-----------+------------+--------------------------------------+
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| GPIO | on-chip | I/O ports |
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+-----------+------------+--------------------------------------+
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| USART | on-chip | Serial ports |
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+-----------+------------+--------------------------------------+
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| SPI | on-chip | Serial Peripheral Interface ports |
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+-----------+------------+--------------------------------------+
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| USB | on-chip | USB device |
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+-----------+------------+--------------------------------------+
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Other hardware features are not currently supported by Zephyr.
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The default configuration can be found in the Kconfig
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:zephyr_file:`boards/arm/arduino_zero/arduino_zero_defconfig`.
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Connections and IOs
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===================
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The `Arduino store`_ has detailed information about board
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connections. Download the `Arduino Zero Schematic`_ for more detail.
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System Clock
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============
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The SAMD21 MCU is configured to use the 32.768 kHz external oscillator
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with the on-chip PLL generating the 48 MHz system clock. The internal
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APB and GCLK unit are set up in the same way as the upstream Arduino
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libraries.
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Serial Port
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===========
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The SAMD21 MCU has 6 SERCOM based USARTs. One of the USARTs
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(SERCOM5) is connected to the onboard Atmel Embedded Debugger (EDBG).
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SERCOM0 is available on the D0/D1 pins.
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SPI Port
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========
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The SAMD21 MCU has 6 SERCOM based SPIs. On the Arduino Zero, SERCOM4
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is available on the 6 pin connector at the edge of the board.
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USB Device Port
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===============
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The SAMD21 MCU has a USB device port that can be used to communicate
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with a host PC. See the :ref:`usb-samples` sample applications for
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more, such as the :ref:`usb_cdc-acm` sample which sets up a virtual
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serial port that echos characters back to the host PC.
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Programming and Debugging
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*************************
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The Arduino Zero comes with a Atmel Embedded Debugger (EDBG). This
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provides a debug interface to the SAMD21 chip and is supported by
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OpenOCD.
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Flashing
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========
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#. Build the Zephyr kernel and the :ref:`hello_world` sample application:
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.. zephyr-app-commands::
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:zephyr-app: samples/hello_world
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:board: arduino_zero
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:goals: build
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:compact:
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#. Connect the Arduino Zero to your host computer using the USB debug
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port.
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#. Run your favorite terminal program to listen for output. Under Linux the
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terminal should be :code:`/dev/ttyACM0`. For example:
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.. code-block:: console
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$ minicom -D /dev/ttyACM0 -o
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The -o option tells minicom not to send the modem initialization
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string. Connection should be configured as follows:
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- Speed: 115200
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- Data: 8 bits
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- Parity: None
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- Stop bits: 1
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#. To flash an image:
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.. zephyr-app-commands::
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:zephyr-app: samples/hello_world
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:board: arduino_zero
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:goals: flash
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:compact:
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You should see "Hello World! arm" in your terminal.
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References
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**********
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.. target-notes::
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.. _Arduino Store:
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https://store.arduino.cc/genuino-zero
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.. _Arduino Zero Schematic:
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https://www.arduino.cc/en/uploads/Main/Zero_V1.0.pdf
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