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boards/atmel/sam/sam4s_xplained/doc/index.rst

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.. zephyr:board:: sam4s_xplained

Overview

The SAM4S Xplained evaluation kit is a development platform to evaluate the Atmel SAM4S series microcontrollers.

Hardware

  • ATSAM4S16C ARM Cortex-M4 Processor
  • 12 MHz crystal oscillator
  • internal 32.768 kHz crystal oscillator
  • IS66WV51216DALL 8 Mb SRAM
  • Micro-AB USB device
  • Micro-AB USB debug interface supporting SEGGER OB and Virtual COM Port and Data
  • One reset and one user pushbutton
  • 2 yellow user LEDs
  • IC pads for external flash chip

Supported Features

.. zephyr:board-supported-hw::

Connections and IOs

Download the SAM4S Xplained Design Files_ for more information. It has full schematic and gerbers files.

System Clock

The SAM4S MCU is configured to use the 12 MHz internal oscillator on the board with the on-chip PLL to generate an 84 MHz system clock.

Serial Port

The ATSAM4S16C MCU has 2 UARTs and 2 USARTs. One of the UARTs (UART0) is connected to the Segger J-Link OB chip (the AT91SAM3U4 is programmed to be Segger J-Link OB). Segger J-Link OB brings the UART out as a virtual COM port. The section flashing uses the UART from the Segger USB debug connection.

Programming and Debugging

.. zephyr:board-supported-runners::

The SAM4S Xplained board comes with Segger J-Link OB <https://www.segger.com/jlink-ob.html>_. This provides a debug interface to the SAM4S16C chip. You can use Ozone or JLink to communicate with the SAM4S16C.

Flashing

For flash the board Zephyr provides two paths. One uses the default JLink tool and the second one uses :ref:atmel_sam_ba_bootloader.

#. Download JLink from the Segger JLink Downloads Page_. Go to the section "J-Link Software and Documentation Pack" and install the "J-Link Software and Documentation pack for Linux". The application JLinkExe needs to be accessible from your path.

#. Connect the SAM4S Xplained board to your host computer using the USB debug port. Then build and flash the :zephyr:code-sample:hello_world application.

.. zephyr-app-commands:: :zephyr-app: samples/hello_world :board: sam4s_xplained :goals: build flash

Using SAM-BA bootloader

#. Close the J25 jumper on the SAM4S Xplained board. Power on the board for 10s.

#. Open the J25 jumper.

#. Connect the SAM4S Xplained board to your host computer using the SoC USB port. Then build and flash the :zephyr:code-sample:hello_world application.

.. zephyr-app-commands:: :zephyr-app: samples/hello_world :board: sam4s_xplained :goals: build

.. code-block:: console

  $ west flash -r bossac

Visualizing the message

#. 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

#. Press reset button

You should see "Hello World! sam4s_xplained" in your terminal.

Debugging

You can debug an application in the usual way. Here is an example for the :zephyr:code-sample:hello_world application.

.. zephyr-app-commands:: :zephyr-app: samples/hello_world :board: sam4s_xplained :maybe-skip-config: :goals: debug

References

.. target-notes::

.. _SAM4S Xplained Online User Guide: http://ww1.microchip.com/downloads/en/devicedoc/atmel-42075-sam4s-xplained-pro_user-guide.pdf

.. _JLink Downloads Page: https://www.segger.com/downloads/jlink

.. _SAM4S Xplained Design Files: http://ww1.microchip.com/downloads/en/DeviceDoc/SAM4S-XPLD__KitsFiles.zip