Hardware requirements

  • Mini/micro USB cable

  • MIMXRT1040-EVK board

  • Personal Computer

Board settings

Weld 0Ω resistor to R346,R350,R356,R362.

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

        SLAVE           connect to      MASTER
Pin Name   Board Location     Pin Name    Board Location
SOUT       J17-4                SIN       SW2-3
SIN        J17-5                SOUT      SW2-2
SCK        J17-6                SCK       SW2-1
PCS0       J17-3                PCS0      SW2-4

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.

Note

When the code is executed in external flash (flexspi_nor targets), the code execution speed is slow. If the baudrate is fast, software can’t handle the data in time. So in this case don’t set baudrate of transmission more than 150k.