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Overview

boards/atmel/sam0/samd20_xpro/doc/index.rst

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.. zephyr:board:: samd20_xpro

Overview

The SAM D20 Xplained Pro evaluation kit is ideal for evaluation and prototyping with the SAM D20 Cortex®-M0+ processor-based microcontrollers. The kit includes Atmel’s Embedded Debugger (EDBG), which provides a full debug interface without the need for additional hardware.

Hardware

  • SAMD20J18 ARM Cortex-M0+ processor at 48 MHz
  • 32.768 kHz crystal oscillator
  • 256 KiB flash memory and 32 KiB of RAM
  • One yellow user LED
  • One mechanical user push button
  • One reset button
  • On-board USB based EDBG unit with serial console

Supported Features

.. zephyr:board-supported-hw::

Connections and IOs

The Microchip website_ has detailed information about board connections. Download the SAM D20 Xplained Pro Schematic_ for more detail.

System Clock

The SAMD20 MCU is configured to use the 32.768 kHz external oscillator with the on-chip PLL generating the 48 MHz system clock.

Serial Port

The SAMD20 MCU has 6 SERCOM based USARTs. One of the USARTs (SERCOM3) is connected to the onboard Atmel Embedded Debugger (EDBG). SERCOM4 is available on the EXT1 connector.

SPI Port

The SAMD20 MCU has 6 SERCOM based SPIs. On the SAM D20 Xplained Pro, SERCOM0 is available on the EXT1 connector.

Programming and Debugging

.. zephyr:board-supported-runners::

The SAM D20 Xplained Pro comes with a Atmel Embedded Debugger (EDBG). This provides a debug interface to the SAMD20 chip and is supported by OpenOCD.

Flashing

#. Build the Zephyr kernel and the :zephyr:code-sample:hello_world sample application:

.. zephyr-app-commands:: :zephyr-app: samples/hello_world :board: samd20_xpro :goals: build :compact:

#. Connect the SAM D20 Xplained Pro 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: samd20_xpro :goals: flash :compact:

You should see "Hello World! samd20_xpro" in your terminal.

References

.. target-notes::

.. _Microchip Technology: https://www.microchip.com/DevelopmentTools/ProductDetails.aspx?PartNO=ATSAMD20-XPRO

.. _Microchip website: https://www.microchip.com/DevelopmentTools/ProductDetails.aspx?PartNO=ATSAMD20-XPRO

.. _SAM D20 Xplained Pro Schematic: http://ww1.microchip.com/downloads/en/DeviceDoc/SAMD20-Xplained-Pro_Design-Documentation.zip