Hardware requirements

  • Mini USB cable

  • FRDM-K32L3A6 board

  • 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 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

When the example runs successfully, you can see the similar information from the terminal as below.

LPSPI functional interrupt example start.

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

Master uses interrupt way and slave uses interrupt way.

Note that some LPSPI instances interrupt is in INTMUX ,you should set the intmux when you porting this example accordingly

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 transfer all data matched!

End of example.