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Overview

boards/nxp/frdm_k22f/doc/index.rst

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.. zephyr:board:: frdm_k22f

Overview

The Freedom-K22F is an ultra-low-cost development platform for Kinetis K22 MCUs.

  • Form-factor compatible with the Arduino R3 pin layout
  • Peripherals enable rapid prototyping, including a 6-axis digital accelerometer and magnetometer to create full eCompass capabilities, a tri-colored LED and 2 user push-buttons for direct interaction, a optional microSD card slot, and headers for use with Bluetooth* and 2.4 GHz radio add-on modules
  • OpenSDAv2, the NXP open source hardware embedded serial and debug adapter running an open source bootloader, offers options for serial communication, flash programming, and run-control debugging

Hardware

  • MK22FN512VLH12 (120 MHz, 512 KB flash memory, 128 KB RAM, low-power, crystal-less USB, and 64 pin Low profile Quad Flat Package (LQFP))

  • Dual role USB interface with micro-B USB connector

  • RGB LED

  • FXOS8700CQ accelerometer and magnetometer

  • Two user push buttons

  • Flexible power supply option - OpenSDAv2 USB, Kinetis K22 USB, and external source

  • Easy access to MCU input/output through Arduino* R3 compatible I/O connectors

  • Programmable OpenSDAv2 debug circuit supporting the CMSIS-DAP Interface software that provides:

    • Mass storage device (MSD) flash programming interface
    • CMSIS-DAP debug interface over a driver-less USB HID connection providing run-control debugging and compatibility with IDE tools
    • Virtual serial port interface
    • Open source CMSIS-DAP software project

  • Optional SDHC

For more information about the K22F SoC and FRDM-K22F board:

  • K22F Website_
  • K22F Datasheet_
  • K22F Reference Manual_
  • FRDM-K22F Website_
  • FRDM-K22F User Guide_
  • FRDM-K22F Schematics_

Supported Features

.. zephyr:board-supported-hw::

.. note::

For additional features not yet supported, please also refer to the :zephyr:board:frdm_k64f, which is the superset board in NXP's Kinetis K series. NXP prioritizes enabling the superset board with NXP's Full Platform Support for Zephyr. Therefore, the frdm_k64f board may have additional features already supported, which can also be re-used on this frdm_k22f board.

Connections and IOs

The K22F SoC has five pairs of pinmux/gpio controllers.

+-------+-----------------+---------------------------+ | Name | Function | Usage | +=======+=================+===========================+ | PTA1 | GPIO | Red LED | +-------+-----------------+---------------------------+ | PTA2 | GPIO | Green LED | +-------+-----------------+---------------------------+ | PTD5 | GPIO | Blue LED | +-------+-----------------+---------------------------+ | PTC1 | GPIO | SW2 | +-------+-----------------+---------------------------+ | PTD0 | GPIO | FXOS8700 INT1 | +-------+-----------------+---------------------------+ | PTD1 | GPIO | FXOS8700 INT2 | +-------+-----------------+---------------------------+ | PTB17 | GPIO | SW3 | +-------+-----------------+---------------------------+ | PTE1 | UART1_RX | UART Console | +-------+-----------------+---------------------------+ | PTE0 | UART1_TX | UART Console | +-------+-----------------+---------------------------+ | PTD2 | UART2_RX | UART BT HCI | +-------+-----------------+---------------------------+ | PTD3 | UART2_TX | UART BT HCI | +-------+-----------------+---------------------------+ | PTC4 | SPI0_PCS0 | SPI | +-------+-----------------+---------------------------+ | PTD1 | SPI0_SCK | SPI | +-------+-----------------+---------------------------+ | PTD2 | SPI0_SOUT | SPI | +-------+-----------------+---------------------------+ | PTD3 | SPI0_SIN | SPI | +-------+-----------------+---------------------------+ | PTB2 | I2C0_SCL | I2C / FXOS8700 | +-------+-----------------+---------------------------+ | PTB3 | I2C0_SDA | I2C / FXOS8700 | +-------+-----------------+---------------------------+

System Clock

The K22F SoC is configured to use the 8 MHz crystal oscillator on the board with the on-chip PLL to generate a 72 MHz system clock in its RUN mode. This clock was selected to allow for the maximum number of peripherals to be used with the crystal and PLL clocks. Other clock configurations are possible through NXP SDK currently.

Serial Port

The K22F SoC has three UARTs. One is configured for the console, another for BT HCI, and the remaining are not used.

USB

The K22F SoC has a USB OTG (USBOTG) controller that supports both device and host functions through its micro USB connector (K22F USB). Only USB device function is supported in Zephyr at the moment.

Programming and Debugging

.. zephyr:board-supported-runners::

Build and flash applications as usual (see :ref:build_an_application and :ref:application_run for more details).

Configuring a Debug Probe

A debug probe is used for both flashing and debugging the board. This board is configured by default to use the :ref:opensda-daplink-onboard-debug-probe.

Early versions of this board have an outdated version of the OpenSDA bootloader and require an update. Please see the DAPLink Bootloader Update_ page for instructions to update from the CMSIS-DAP bootloader to the DAPLink bootloader.

Option 1: :ref:opensda-daplink-onboard-debug-probe (Recommended)

Follow the instructions in :ref:opensda-daplink-onboard-debug-probe to program the OpenSDA DAPLink FRDM-K22F Firmware_.

Install the :ref:linkserver-debug-host-tools and make sure they are in your search path. LinkServer works with the default CMSIS-DAP firmware included in the on-board debugger.

Linkserver is the default for this board, west flash and west debug will call the linkserver runner.

.. code-block:: console

west flash

Alternatively, pyOCD can be used to flash and debug the board by using the -r pyocd option with West. pyOCD is installed when you complete the :ref:gs_python_deps step in the Getting Started Guide. The runners supported by NXP are LinkServer and JLink. pyOCD is another potential option, but NXP does not test or support the pyOCD runner.

Install the :ref:jlink-debug-host-tools and make sure they are in your search path.

Follow the instructions in :ref:opensda-jlink-onboard-debug-probe to program the Segger J-Link OpenSDA V2.1 Firmware_. Note that Segger does provide an OpenSDA J-Link Board-Specific Firmware for this board, however it is not compatible with the DAPLink bootloader.

Add the arguments -DBOARD_FLASH_RUNNER=jlink and -DBOARD_DEBUG_RUNNER=jlink when you invoke west build to override the default runner from pyOCD to J-Link:

.. zephyr-app-commands:: :zephyr-app: samples/hello_world :board: frdm_k22f :gen-args: -DBOARD_FLASH_RUNNER=jlink -DBOARD_DEBUG_RUNNER=jlink :goals: build

Configuring a Console

Regardless of your choice in debug probe, we will use the OpenSDA microcontroller as a usb-to-serial adapter for the serial console.

Connect a USB cable from your PC to J26.

Use the following settings with your serial terminal of choice (minicom, putty, etc.):

  • Speed: 115200
  • Data: 8 bits
  • Parity: None
  • Stop bits: 1

Flashing

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

.. zephyr-app-commands:: :zephyr-app: samples/hello_world :board: frdm_k22f :goals: flash

Open a serial terminal, reset the board (press the SW1 button), and you should see the following message in the terminal:

.. code-block:: console

***** Booting Zephyr OS v2.0.0 ***** Hello World! frdm_k22f

Debugging

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

.. zephyr-app-commands:: :zephyr-app: samples/hello_world :board: frdm_k22f :goals: debug

Open a serial terminal, step through the application in your debugger, and you should see the following message in the terminal:

.. code-block:: console

***** Booting Zephyr OS v2.0.0 ***** Hello World! frdm_k22f

.. include:: ../../common/board-footer.rst.inc

.. _FRDM-K22F Website: https://www.nxp.com/support/developer-resources/evaluation-and-development-boards/freedom-development-boards/mcu-boards/nxp-freedom-development-platform-for-kinetis-k22-mcus:FRDM-K22F

.. _FRDM-K22F User Guide: https://www.nxp.com/webapp/Download?colCode=FRDMK22FUG

.. _FRDM-K22F Schematics: https://www.nxp.com/webapp/Download?colCode=FRDM-K22F-SCH

.. _K22F Website: https://www.nxp.com/products/processors-and-microcontrollers/arm-based-processors-and-mcus/kinetis-cortex-m-mcus/k-seriesperformancem4/k2x-usb/kinetis-k22-120-mhz-cost-effective-full-speed-usb-microcontrollers-mcus-based-on-arm-cortex-m4-core:K22_120

.. _K22F Datasheet: https://www.nxp.com/docs/en/data-sheet/K22P121M120SF7.pdf

.. _K22F Reference Manual: https://www.nxp.com/docs/en/reference-manual/K22P121M120SF7RM.pdf

.. _OpenSDA DAPLink FRDM-K22F Firmware: https://www.nxp.com/downloads/en/snippets-boot-code-headers-monitors/k20dx_frdmk22f_if_crc_legacy_0x8000.bin

.. _DAPLink Bootloader Update: https://os.mbed.com/blog/entry/DAPLink-bootloader-update/

.. _Segger J-Link OpenSDA V2.1 Firmware: https://www.segger.com/downloads/jlink/OpenSDA_V2_1.bin