Hardware requirements

  • Mini/micro USB cable

  • MCX-N9XX-EVK Board

  • Personal Computer

Board settings

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

MASTER(FlexIO SPI)          connect to      SLAVE(LPSPI1)
Pin Name   Board Location                   Pin Name    Board Location
SOUT       J20 pin 26                       SIN         J2 pin 10
SIN        J20 pin 25                       SOUT        J2 pin 8
SCK        J20 pin 27                       SCK         J2 pin 12
PCS0       J20 pin 28                       PCS0        J2 pin 6

Prepare the Demo

  1. Connect a USB cable between the host PC and the EVK board J5.

  2. Open a serial terminal with the following 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 log below shows the output of the hello world demo in the terminal window:

FLEXIO Master - LPSPI Slave interrupt example start.
This example use one flexio spi as master and one lpspi instance as slave on one board.
Master and slave are both use 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.