请问有谁调试成功过CY8C21434 SPIM 模块的读操作

只看该作者 · 2013-2-23 13:58

我可以向SPI从设备写操作，但是死活都不能进行读操作，请高手指点

只看该作者 · 2013-2-23 13:59

void SPI_Write(unsigned char dig)
{
      PRT2DR |= CS;
      while(!(SPIM_1_bReadStatus() & SPIM_1_SPIM_TX_BUFFER_EMPTY)){};
      PRT2DR &= ~CS;                      // set slave select low
      SPIM_1_SendTxData(dig); // set message to transmit
      while(!(SPIM_1_bReadStatus() & SPIM_1_SPIM_SPI_COMPLETE)){};
      PRT2DR |= CS;                      //
}

unsigned char SPI_Read(void)
{
      unsigned char ReceivedData;

      PRT2DR |= CS;

      PRT2DR &= ~CS;
      SPIM_1_SendTxData(0x00);  // 写伪数据，以便读到数据
      while(!(SPIM_1_bReadStatus() &  SPIM_1_SPIM_RX_BUFFER_FULL));//RX Buffer register has received current data
      ReceivedData = SPIM_1_bReadRxData();
      PRT2DR |= CS;

      return ReceivedData;
}