死活都不能进行读操作

1万 · 2018-7-6 19:41

可以向SPI从设备写操作，但是死活都不能进行读操作

1万 · 2018-7-6 19:44

什么片子啊

1万 · 2018-7-6 19:47

程序看看

1万 · 2018-7-6 19:50

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;
}

1万 · 2018-7-6 19:53

哦，那我就知道怎么回事了，多谢大家，结贴了哈