死活都不能进行读操作

2万 · 2015-5-18 21:39

我可以向SPI从设备写操作，但是死活都不能进行读操作，

2万 · 2015-5-18 21:40

什么片子啊

2万 · 2015-5-18 21:40

有谁调试成功过CY8C21434 SPIM 模块的读操作

2万 · 2015-5-18 21:40

程序呢

2万 · 2015-5-18 21:41

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 · 2015-5-18 21:42

http://www1.cypress.com/?rID=3098
这里有SPIM模块的中英文数据手册，楼主可以参考一下

2万 · 2015-5-18 21:42

嗯，我看看啊