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Overview

boards/atmel/sam/sam_v71_xult/doc/index.rst

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.. zephyr:board:: sam_v71_xult

Overview

The SAM V71 Xplained Ultra evaluation kit is a development platform to evaluate the Atmel SAM V71 series microcontrollers. The current version allows to use both IC variations ATSAMV71Q21A(B).

Hardware

  • ATSAMV71Q21A(B) ARM Cortex-M7 Processor
  • 12 MHz crystal oscillator
  • 32.768 kHz crystal oscillator
  • Supercap backup
  • AT24MAC402 EEPROM
  • IS42S16100E 16 Mb SDRAM
  • S25FL116K 16 Mb QSPI
  • WM8904 low power stereo audio codec
  • ATA6561 CAN Transceiver
  • SD card connector with SDIO support
  • Camera interface connector
  • MediaLB connector
  • Ethernet port
  • Micro-AB USB device
  • Micro-AB USB debug interface supporting CMSIS-DAP, Virtual COM Port and Data Gateway Interface (DGI)
  • JTAG interface connector
  • One reset and two user pushbuttons
  • Two yellow user LEDs

Supported Features

.. zephyr:board-supported-hw::

Connections and IOs

The SAMV71-XULT User Guide_ has detailed information about board connections.

System Clock

The SAM V71 MCU is configured to use the 12 MHz external oscillator on the board with the on-chip PLL to generate a 300 MHz system clock.

Serial Port

The ATSAMV71Q21 MCU has five UARTs and three USARTs. USART1 is configured for the console and is available as a Virtual COM Port via EDBG USB chip.

Programming and Debugging

.. zephyr:board-supported-runners::

Flashing the Zephyr project onto SAM V71 MCU requires the OpenOCD tool. By default a factory new SAM V71 chip will boot the SAM-BA boot loader located in the ROM, not the flashed image. This is determined by the value of GPNVM1 (General-Purpose NVM bit 1). The flash procedure will ensure that GPNVM1 is set to 1 changing the default behavior to boot from Flash.

If your chip has a security bit GPNVM0 set you will be unable to program flash memory or connect to it via a debug interface. The only way to clear GPNVM0 is to perform a chip erase procedure that will erase all GPNVM bits and the full contents of the SAM V71 flash memory:

  • With the board power off, set a jumper on the J200 header.
  • Turn the board power on. The jumper can be removed soon after the power is on (flash erasing procedure is started when the erase line is asserted for at least 230ms)

Flashing

#. 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

#. Connect the SAM V71 Xplained Ultra 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: sam_v71_xult/samv71q21 :goals: build flash

You should see "Hello World! sam_v71_xult" in your terminal.

#. To use the SoC variation B IC, you need type "sam_v71_xult/samv71q21b".

.. zephyr-app-commands:: :zephyr-app: samples/hello_world :board: sam_v71_xult/samv71q21b :goals: build flash

You should see "Hello World! sam_v71_xult" in your terminal.

You can flash the image using an external debug adapter such as J-Link or ULINK, connected to the 20-pin JTAG header. Supply the name of the debug adapter (e.g., jlink) via an OPENOCD_INTERFACE environment variable. OpenOCD will look for the appropriate interface configuration in an interface/$(OPENOCD_INTERFACE).cfg file on its internal search path.

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: sam_v71_xult/samv71q21 :maybe-skip-config: :goals: debug

References

SAM V71 Product Page: https://www.microchip.com/design-centers/32-bit/sam-32-bit-mcus/sam-v-mcus

.. _SAMV71-XULT User Guide: http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-42408-SAMV71-Xplained-Ultra_User-Guide.pdf

.. _OpenOCD tool: http://openocd.org/

.. _SAM-BA: https://www.microchip.com/developmenttools/ProductDetails/PartNO/SAM-BA%20In-system%20Programmer