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166 lines
5.1 KiB
166 lines
5.1 KiB
.. _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.jpg |
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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 LittleFS 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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| PWM | on-chip | Pulse Width Modulation | |
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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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| DAC | on-chip | Digital to analogue converter | |
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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/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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PWM |
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=== |
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The SAMD21 MCU has 3 TCC based PWM units with up to 4 outputs each and a period |
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of 24 bits or 16 bits. If :code:`CONFIG_PWM_SAM0_TCC` is enabled then LED0 is |
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driven by TCC2 instead of by GPIO. |
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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 :zephyr:code-sample:`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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DAC |
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=== |
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The SAMD21 MCU has a single channel DAC with 10 bits of resolution. On the |
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Arduino Zero, the DAC is available on pin A0. |
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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! arduino_zero" 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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