This is the documentation for the latest (main) development branch of mcuxpresso sdk. If you are looking for the documentation of previous releases, use the drop-down menu on the left and select the desired version.

Hardware requirements

  • Mini USB cable

  • FRDM-K32L3A6 boards

  • Personal Computer

Board settings

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

MASTER(SPI0)           connect to        SLAVE(SPI3)
Pin Name   Board Location     Pin Name  Board Location
SOUT       J2 pin 8             SIN       J1  pin 6
SIN        J2 pin 10            SOUT      J1  pin 2
SCK        J2 pin 12            SCK       J3  pin 5
PCS2       J2 pin 6             PCS1      J3  pin 9

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

    PCS0     --    PCS0

    SOUT     --    SIN

    SIN      --    SOUT

LPSPI master transfer completed successfully.

LPSPI slave transfer completed successfully.

LPSPI transfer all data matched !