Hardware requirements

  • Type-C USB cable

  • FRDM-MCXE31B board

  • Personal Computer Board settings ============ SPI one board: Transfer data from one board instance to another board’s instance. SPI0 pins are connected with SPI0 pins of another board

INSTANCE1(LPSPI_1)     CONNECTS TO         INSTANCE1(LPSPI_1)
Pin Name   Board Location     Pin Name  Board Location
SOUT        J6 pin 6           SIN       J6 pin 5
SIN         J6 pin 5           SOUT      J6 pin 6
SCK         J6 pin 4           SCK       J6 pin 4
PCS0        J6 pin 3           PCS0      J6 pin 3 
GND         J6 pin 8           GND       J6 pin 8

Prepare the Demo

  1. Connect a type-c USB cable between the PC host and the MCU-Link USB port on the board.

  2. Open a serial terminal on PC for MCU-Link 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. Reset the SoC and run the project.

Running the demo

When the demo runs successfully, the log would be seen on the MCU-Link terminal like:

LPSPI board to board polling example.
This example use one board as master and another as slave.
Master uses polling way and slave uses interrupt way.
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
   GND       --    GND

 Master transmit:

  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F 10
 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 20
 21 22 23 24 25 26 27 28 29 2A 2B 2C 2D 2E 2F 30
 31 32 33 34 35 36 37 38 39 3A 3B 3C 3D 3E 3F 40

LPSPI transfer all data matched!

 Master received:

  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F 10
 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 20
 21 22 23 24 25 26 27 28 29 2A 2B 2C 2D 2E 2F 30
 31 32 33 34 35 36 37 38 39 3A 3B 3C 3D 3E 3F 40