Hardware requirements

  • Mini USB cable

  • FRDM-K32L2A4S board

  • Personal Computer

Board settings

To make the example work, connections needed to be as follows:

       MASTER           connect to      SLAVE
Pin Name   Board Location     Pin Name  Board Location
SOUT       J2 pin 8             SIN       J20 pin 7
SIN        J2 pin 10            SOUT      J20 pin 6
SCK        J2 pin 12            SCK       J20 pin 5
PCS0       J2 pin 6             PCS0      J20 pin 4

Prepare the Demo

  1. Connect a mini USB cable between the PC host and the OpenSDA USB port on the board.

  2. Open a serial terminal on PC for JLink serial device with these settings:

    • 115200 baud rate

    • 8 data bits

    • No parity

    • One stop bit

    • No flow control

  3. Download the program to the target board.

  4. Either press the reset button on your board or launch the debugger in your IDE to begin running the demo.

Running the demo

The following message shows in the terminal if the example runs successfully.

FreeRTOS LPSPI example start.
This example use one lpspi instance as master and another as slave on a single board.
Master and slave are both use interrupt way.
Please make sure you make the correct line connection. Basically, the connection is:
LPSPI_master -- LPSPI_slave
    CLK      --    CLK
    PCS      --    PCS
    SOUT     --    SIN
    SIN      --    SOUT

LPSPI master transfer completed successfully.
LPSPI slave transfer completed successfully.
LPSPI transfer all data matched !