Hardware requirements

  • Mini USB cable

  • FRDM-K32L3A6 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(PTE19)       J1 pin 7            SIN (PTC11)    J4 pin 2
SIN (PTE13)       J1 pin 1            SOUT(PTC9)     J2 pin 18
SCK (PTB15)       J3 pin 15           SCK (PTC30)    J2 pin 13
PCS0(PTE21)      J1 pin 11            PCS0(PTC12)    J4 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 OpenSDA 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

You can see the similar message shows following in the terminal if the example runs successfully.

FLEXIO Master edma - LPSPI Slave interrupt example start.

This example use one flexio spi as master and one lpspi instance as slave on one board.

Master uses edma and slave uses interrupt way.

Please make sure you make the correct line connection. Basically, the connection is:

FLEXIO_SPI_master -- LPSPI_slave

      CLK        --    CLK

      PCS        --    PCS

      SOUT       --    SIN

      SIN        --    SOUT

This is LPSPI slave call back.

FLEXIO SPI master <-> LPSPI slave transfer all data matched!

End of example.