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Overview

boards/nxp/frdm_kw41z/doc/index.rst

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.. zephyr:board:: frdm_kw41z

Overview

The FRDM-KW41Z is a development kit enabled by the Kinetis® W series KW41Z/31Z/21Z (KW41Z) family built on ARM® Cortex®-M0+ processor with integrated 2.4 GHz transceiver supporting Bluetooth® Smart/Bluetooth® Low Energy (BLE) v4.2, Generic FSK, IEEE® 802.15.4 and Thread.

The FRDM-KW41Z kit contains two Freedom boards that can be used as a development board or a shield to connect to a host processor. The FRDM-KW41Z is form-factor compatible with the Arduino™ R3 pin layout for more expansion options.

The FRDM-KW41Z highly-sensitive, optimized 2.4 GHz radio features a PCB F-antenna which can be bypassed to test via SMA connection, multiple power supply options, push/capacitive touch buttons, switches, LEDs and integrated sensors.

Hardware

  • Can be configured as Host or Shield for connection to Host Processor
  • Supports all DC-DC configurations (Buck, Boost, Bypass)
  • PCB inverted F-type antenna
  • SMA RF Connector
  • RF regulatory certified
  • Serial Flash for OTA firmware upgrades
  • On board NXP FXOS8700CQ digital sensor, 3D Accelerometer (±2g/ ±4g/ ±8g) + 3D Magnetometer
  • OpenSDA and JTAG debug

For more information about the KW41Z SoC and FRDM-KW41Z board:

  • KW41Z Website_
  • KW41Z Datasheet_
  • KW41Z Reference Manual_
  • FRDM-KW41Z Website_
  • FRDM-KW41Z User Guide_
  • FRDM-KW41Z Schematics_

Supported Features

.. zephyr:board-supported-hw::

Connections and IOs

The KW41Z SoC has three pairs of pinmux/gpio controllers, but only two are currently enabled (PORTA/GPIOA and PORTC/GPIOC) for the FRDM-KW41Z board.

+-------+-------------+---------------------------+ | Name | Function | Usage | +=======+=============+===========================+ | PTC1 | GPIO | Red LED / FXOS8700 INT1 | +-------+-------------+---------------------------+ | PTA19 | GPIO | Green LED | +-------+-------------+---------------------------+ | PTA18 | GPIO | Blue LED | +-------+-------------+---------------------------+ | PTB2 | ADC | ADC0 channel 3 | +-------+-------------+---------------------------+ | PTC2 | I2C1_SCL | I2C / FXOS8700 | +-------+-------------+---------------------------+ | PTC3 | I2C1_SDA | I2C / FXOS8700 | +-------+-------------+---------------------------+ | PTC4 | GPIO | SW3 | +-------+-------------+---------------------------+ | PTC5 | GPIO | SW4 | +-------+-------------+---------------------------+ | PTC6 | LPUART0_RX | UART Console | +-------+-------------+---------------------------+ | PTC7 | LPUART0_TX | UART Console | +-------+-------------+---------------------------+ | PTC16 | SPI0_SCK | SPI | +-------+-------------+---------------------------+ | PTC17 | SPI0_SOUT | SPI | +-------+-------------+---------------------------+ | PTC18 | SPI0_SIN | SPI | +-------+-------------+---------------------------+ | PTC19 | SPI0_PCS0 | SPI | +-------+-------------+---------------------------+

System Clock

The KW41Z SoC is configured to use the 32 MHz external oscillator on the board with the on-chip FLL to generate a 40 MHz system clock.

Serial Port

The KW41Z SoC has one UART, which is used for the console.

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.

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

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

Follow the instructions in :ref:opensda-daplink-onboard-debug-probe to program the OpenSDA DAPLink FRDM-KW41Z Firmware_.

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 OpenSDA J-Link FRDM-KW41Z Firmware_.

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_kw41z :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 J6.

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_kw41z :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 v1.14.0-rc1 ***** Hello World! frdm_kw41z

Debugging

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

.. zephyr-app-commands:: :zephyr-app: samples/hello_world :board: frdm_kw41z :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 v1.14.0-rc1 ***** Hello World! frdm_kw41z

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

.. _FRDM-KW41Z Website: https://www.nxp.com/products/processors-and-microcontrollers/arm-based-processors-and-mcus/kinetis-cortex-m-mcus/w-serieswireless-conn.m0-plus-m4/freedom-development-kit-for-kinetis-kw41z-31z-21z-mcus:FRDM-KW41Z

.. _FRDM-KW41Z User Guide: https://www.nxp.com/webapp/Download?colCode=FRDMKW41ZUG

.. _FRDM-KW41Z Schematics: https://www.nxp.com/webapp/Download?colCode=FRDM-KW41Z-SCH

.. _KW41Z Website: https://www.nxp.com/products/wireless/zigbee/kinetis-kw41z-2.4-ghz-dual-mode-bluetooth-low-energy-and-802.15.4-wireless-radio-microcontroller-mcu-based-on-arm-cortex-m0-plus-core:KW41Z

.. _KW41Z Datasheet: https://www.nxp.com/docs/en/data-sheet/MKW41Z512.pdf

.. _KW41Z Reference Manual: https://www.nxp.com/webapp/Download?colCode=MKW41Z512RM

.. _OpenSDA DAPLink FRDM-KW41Z Firmware: https://www.nxp.com/downloads/en/reference-applications/OpenSDAv2.2_DAPLink_frdmkw41z_rev0241.zip

.. _OpenSDA J-Link FRDM-KW41Z Firmware: https://www.segger.com/downloads/jlink/OpenSDA_FRDM-KW41Z