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:

This is slave example for DSPI half-duplex EDMA transfer.
Slave is working....

The received data are:
  0x01  0x02  0x03  0x04  0x05  0x06  0x07  0x08  0x09  0x0A  0x0B  0x0C  0x0D  0x0E  0x0F  0x10
  0x11  0x12  0x13  0x14  0x15  0x16  0x17  0x18  0x19  0x1A  0x1B  0x1C  0x1D  0x1E  0x1F  0x20
  0x21  0x22  0x23  0x24  0x25  0x26  0x27  0x28  0x29  0x2A  0x2B  0x2C  0x2D  0x2E  0x2F  0x30
  0x31  0x32  0x33  0x34  0x35  0x36  0x37  0x38  0x39  0x3A  0x3B  0x3C  0x3D  0x3E  0x3F  0x40

Slave transfer completed.