/*!
    \file    readme.txt
    \brief   description of the master and slave simplex communication use dma demo

    \version 2022-05-30, V1.0.0, firmware for GD32F403
*/

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*/

   This example is based on the GD32F403Z - EVAL - V1.1 board, it shows SPI0 and SPI1 simuplex
communication using DMA mode.

  1.Master tramsmit slave receive mode:
    Connect SPI0 SCK  PIN(PA5) TO SPI1 SCK  PIN(PB13).
    Connect SPI0 MOSI PIN(PA7) TO SPI1 MOSI PIN(PB15).
    Connect SPI0 NSS  PIN(PA4) TO SPI1 NSS  PIN(PB12).

  Modify file:
    examlple / SPI / SPI_master_slave_simplex_dma / main.c, choose master tramsmit slave
receive mode.
    #define MASTER_TRAMSMIT_SLVAE_RECEIVE
    //#define SLVAE_TRAMSMIT_MASTER_RECEIVE

  After the communication is completed, if the data received is equal to the data sent, LED2
turn on, if not LED2 turn off.

  2.Slave tramsmit master receive mode:
    Connect SPI0 SCK  PIN(PA5) TO SPI1 SCK  PIN(PB13).
    Connect SPI0 MISO PIN(PA6) TO SPI1 MISO PIN(PB14).
    Connect SPI0 NSS  PIN(PA4) TO SPI1 NSS  PIN(PB12).

  Modify file:
     examlple / SPI / SPI_master_slave_simplex_dma / main.c, choose slave tramsmit master
receive mode.
    //#define MASTER_TRAMSMIT_SLVAE_RECEIVE
    #define SLVAE_TRAMSMIT_MASTER_RECEIVE

  After the communication is completed, if the data received is equal to the data sent, LED3
turn on, and if not, LED3 turn off.
