Hardware requirements

  • Micro USB cable

  • FRDM-KE15Z board

  • Personal Computer

Board settings

The example requires connecting the FLEXIO pins with the LPSPI pins The connection should be set as following: SLAVE connect to MASTER Pin Name Board Location Pin Name Board Location SOUT J2 pin 8 SIN J21 pin 8 SIN J2 pin 10 SOUT J21 pin 7 SCK J2 pin 12 SCK J21 pin 6 PCS3 J2 pin 6 PCS3 J21 pin 5

Prepare the Demo

  1. Connect a USB cable between the host PC and the OpenSDA USB port on the target board.

  2. Open a serial terminal with the following settings:

  • 115200 baud rate

  • 8 data bits

  • No parity

  • One stop bit

  • No flow control

  1. Download the program to the target board.

  2. 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, the following message is displayed in the terminal:

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:

FLEXI_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.