Hardware requirements

  • Mini USB cable

  • Two FRDM-K22F boards

  • Personal Computer

Board settings

SPI one board: Transfer data from one instance to anther instance on the other board. Note: Please separate the connected wires(CLK wire is important), if not, mixed wires may caused electromagnetic interference and data will transfer error.

  Master Board                           Slave Board
INSTANCE0(SPI0)     CONNECTS TO         INSTANCE1(SPI1)
Pin Name   Board Location     Pin Name  Board Location
SIN        J1 pin 11           SOUT      J1 pin 16
SOUT       J1 pin 16           SIN       J1 pin 11
SCK        J1 pin 15           SCK       J1 pin 15
PCS0       J24 pin 9           PCS0      J24 pin 9
GND        J2-14               GND       J2-14

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. Reset the SoC and run the project.

Running the demo

When the demo runs successfully, the log would be seen on the OpenSDA terminal like:

DSPI CMSIS driver board to board edma example.
This example use one board as master and another as slave.
Master and slave uses EDMA way. Slave should start first. 
Please make sure you make the correct line connection. Basically, the connection is: 
DSPI_master -- DSPI_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
This is DSPI_MasterSignalEvent_t
Master transmit data to slave has completed!
This is DSPI_MasterSignalEvent_t
Master receive data from slave has completed!
 
DSPI 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

 Input any char to run again