ContextQMD
Back to Zephyr

SparkFun MicroMod board Processor

boards/sparkfun/micromod/doc/index.rst

4.4.04.9 KB
Original Source

.. zephyr:board:: micromod

SparkFun MicroMod board Processor #################################

Overview

MicroMod is a solderless, modular interface ecosystem that uses the M.2 standard to mix and match your choice of processor with specific Function Boards or stand-alone Carrier Boards. A MicroMod processor board is approximately 22x22 mm, and can insert into any MicroMod carrier board. More information can be found in the Micromod specification website_.

All Micromod board targets support the following hardware features:

  • USB host mode compliant to 2.0 specification
  • GPIO
  • 2 UART
  • 2 I2C
  • 2 SPI
  • 2 ADC
  • 2 PWM
  • Watchdog Timer (WDT)

.. figure:: img/sparkfun_micromod.webp :align: center :alt: Sparkfun Micromod board

Sparkfun Micromod board (Credit: https://www.sparkfun.com)

Zephyr currently supports the following SoCs:

  • micromod/nrf52840

SparkFun MicroMod nRF52840 board Processor ##########################################

Overview

The micromod/nrf52840 board target features the nRF52840 SoC from Nordic Semiconductor, the SparkFun MicroMod nRF52840 Processor offers a powerful combination of ARM Cortex-M4 CPU and 2.4 GHz Bluetooth transceiver in the MicroMod form-factor. More information can be found in the Micromod nRF52840 guide_.

Hardware

The micromod/nrf52840 board target supports the following hardware features:

  • ARM Cortex-M4 CPU with floating point unit (FPU)

    • 1MB internal Flash
    • 256kB internal RAM

  • Integrated 2.4GHz radio with support for Bluetooth Low Energy (BLE) and ieee802154

  • USB 2.0 full speed (12 Mbps) controller

  • QSPI with 128Mb flash memory

  • ARM TrustZone Cryptocell 310 security subsystem

  • USB host mode compliant to 2.0 specification

  • GPIO

  • 2 UART

  • 2 I2C

  • 2 SPI

  • 2 ADC

  • 2 PWM

  • Watchdog Timer (WDT)

Supported Features

.. zephyr:board-supported-hw::

Connections and IOs

LED

  • Led0 (blue) = P0.13

Micromod header

  • micromod_1_uart = uart0
  • micromod_2_uart = uart1
  • micromod_0_i2c = i2c0
  • micromod_1_i2c = i2c1
  • micromod_0_spi = spi2
  • micromod_header compatible with sparkfun,micromod-gpio

Programming and Debugging

Applications for the micromod/nrf52840 board target can be built, flashed, and debugged in the usual way. See :ref:build_an_application and :ref:application_run for more details on building and running.

Flashing

Follow the instructions in the :ref:nordic_segger page to install and configure all the necessary software. Further information can be found in :ref:nordic_segger_flashing. Then build and flash applications as usual (see :ref:build_an_application and :ref:application_run for more details).

The flashing tool will depend on the carrier used along with the board. In the case of Sparkfun asset tracking carrier_, it is possible to use the SWD interface along with a J-Link.

Here is an example for the :zephyr:code-sample:hello_world application.

First, run your favorite terminal program to listen for output.

.. code-block:: console

$ minicom -D <tty_device> -b 115200

Replace :code:<tty_device> with the port where the board nRF52840 DK can be found. For example, under Linux, :code:/dev/ttyACM0.

Then build and flash the application in the usual way.

.. zephyr-app-commands:: :zephyr-app: samples/hello_world :board: micromod/nrf52840 :goals: build flash

Debugging

Refer to the :ref:nordic_segger page to learn about debugging Nordic boards with a Segger IC.

In case of using a Nordic Segger Jlink, it is possible to configure the app to use Segger Real Time Transfer (RTT) for debugging. In this case, build your app with the :ref:RTT snippet <snippet-rtt-console>.

Testing the on-board LED

There is a sample that allow you to test the LED on the board is working properly with Zephyr:

  • :zephyr:code-sample:blinky

You can build and flash the example to make sure Zephyr is running correctly on your board. The button and LED definitions can be found in :zephyr_file:boards/sparkfun/micromod/micromod_nrf52840.dts.

Testing the 128Mb qspi memory flash

The micromod/nrf52840 board target has a built-in NOR flash memory connected to the qspi interface. It can be tested with the samples/drivers/jesd216 app.

.. zephyr-app-commands:: :zephyr-app: samples/drivers/jesd216 :board: micromod/nrf52840 :goals: build flash

References

.. target-notes::

.. _Micromod specification website: https://www.sparkfun.com/micromod .. _Sparkfun asset tracking carrier: https://www.sparkfun.com/products/17272 .. _Micromod nRF52840 guide: https://learn.sparkfun.com/tutorials/micromod-nrf52840-processor-hookup-guide .. _J-Link Software and documentation pack: https://www.segger.com/jlink-software.html .. _nRF52840 Product Specification: http://infocenter.nordicsemi.com/pdf/nRF52840_PS_v1.0.pdf