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boards/cirrus/crd40l50/doc/index.rst

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.. zephyr:board:: crd40l50

Overview

The CRD40L50-POC-Q "Blackstar" demonstration board is a hardware platform used to evaluate Cirrus Logic CS40L50 haptic drivers. The board provides a set of features that enables programming the on-board STM32F401xD microcontroller with custom sample applications, including the CS40L5x sample provided in Zephyr's samples directory.

Hardware

  • STM32F401xD microcontroller
  • AT25 SPI flash controller with 256 KiB flash memory
  • 32.768 kHz crystal oscillator
  • Two pass/fail LEDs, one green and one red
  • Three yellow user LEDs
  • One user push button
  • Power source selector switch
  • Actuator output for LRAs
  • One Pico-Clasp connector for GPIOs
  • One USB-C port for Cirrus Logic ETHapBridge connectivity
  • Programming and debugging of on-board STM32F401xD through Serial Wire Debug (SWD)

Supported Features

.. zephyr:board-supported-hw::

Connections and IOs

  • Molex 1053131302 connector (J4) for haptic output
  • JST S2B-PH-SM4-TB(LF)(SN) connector (J5) for external power sources
  • SWD header (J7) for J-Link debug probes
  • Molex 203559-0607 connector (J8) for GPIOs
  • USB-C port (J10) for ETHapBridge connectivity

Programming & Debugging

.. zephyr:board-supported-runners::

Flash Using J-Link

To flash the board using the J-Link debugger, follow the steps below:

  1. Install J-Link Software

    • Download and install the J-Link software_ tools from Segger.
    • Make sure the installed J-Link executables (e.g., JLink, JLinkRTTViewer) are available in your system's PATH.

  2. Connect the Board

    • Connect the J-Link Debug Probe_ to the board's SWD header (J7).
    • Connect the other end of the J-Link Debug Probe to your host machine via USB.
    • Connect the VBAT connector (J5) to an external power source to power up the board.

  3. Build the Application

    You can build a sample Zephyr application, such as Blinky or cs40l5x, using the west tool. Run the following commands from your Zephyr workspace:

    .. code-block:: console

    west build -b crd40l50 -p always samples/drivers/haptics/cs40l5x

    This will build the CS40L5x sample application for the crd40l50 board.

  4. Flash the Device

    Once the build completes, flash the firmware using:

    .. code-block:: console

    west flash --runner jlink

    This uses the jlink runner to flash the application to the board.

  5. Observe the Result

    After flashing, interact with the Shell interface via JLinkRTTViewer to demo the on-board CS40L50 haptics driver.

References

.. _Cirrus Logic: https://www.cirrus.com/support

.. _J-Link software: https://www.segger.com/downloads/jlink

.. _J-Link Debug Probe: https://www.segger.com/products/debug-probes/j-link/