Hardware requirements

  • Micro USB cable

  • Two LPCXpresso55S16 boards

  • Personal Computer

Board settings

Connect SPI master on board to SPI slave on other board

    Master_board(SPI7)           Slave_board(SPI7)                          
Pin Name   Board Location     Pin Name   Board Location                     
MISO       J9    pin 11       MISO       J9    pin 11
MOSI       J9    pin 9        MOSI       J9    pin 9
SCK        J9    pin 13       SCK        J9    pin 13
SSEL1      J9    pin 2        SSEL1      J9    pin 2
GND        J9    pin 8        GND        J9    pin 8

The jumper setting: Default jumpers configuration does not work, you will need to add JP20 and JP21 (JP22 optional for ADC use)

Prepare the Demo

  1. Connect a micro USB cable between the PC host and the CMSIS DAP USB port (J1) on the board

  2. Open a serial terminal with the following settings (See Appendix A in Getting started guide for description how to determine serial port number):

    • 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 CMSIS DAP terminal like:

This is SPI DMA transfer slave example.
This example will communicate with another master SPI on the other board.
Slave board is working...!

The received data are:
    0x00  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
SPI transfer all data matched!

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