无法让STM8L的RX缓冲区正确读取

也许有些拥有SPI经验的人可以轻松发现这一点。我有一个SPI从设备连接到我的STM8L152。我看到设备请求读取寄存器的时钟和数据流，然后我可以看到MISO线上返回的正确比特流。但是，我无法让STM8L的RX缓冲区正确读取。实际上，无论我在线上看到的位模式，它都很少改变。我已经尝试了两种相位极性，我相信时钟极性应该是“低空闲”。以下是代码的简短部分，仅使用标准库调用，遵循协议，据我所知，它来自用户手册（第549页，“全双工”）。我在最后一行后断行并读取返回的结果。欢迎任何建议。谢谢。


//通过SPI外设发送字节
SPI_SendData（SPI1,0x42）;
//循环，而DR寄存器不为空
while（SPI_GetFlagStatus（SPI1，SPI_FLAG_TXE）== RESET）;

//通过SPI外设发送冗余字节（响应第一次读取的时钟）
SPI_SendData（SPI1,0x42）;
//等待接收一个字节
while（SPI_GetFlagStatus（SPI1，SPI_FLAG_RXNE）== RESET）;

//返回从SPI总线读取的字节
spiByte = SPI_ReceiveData（SPI1）;
#spi



以下为原文




Maybe some of you with SPI experience can spot this one easily. I have a SPI slave device connected to my STM8L152. I watch the clock and data stream to the device requesting a read of a register, and then I can see the proper bit stream returned on the MISO line. However, I cannot get the STM8L's RX buffer to read the thing correctly. In fact, it rarely changes no matter what the bit pattern I see on the line. I have tried both phase polarities, and I am confident the clock polarity should be ''idle low''. Here is the short section of code, using only standard library calls, following the protocol as I understand it to be from the User's Manual (pg 549, ''full duplex''). I break on a line following the last and read the returned result. Any suggestions are welcome. Thanks.


  //send byte through the SPI peripheral
   SPI_SendData(SPI1, 0x42);
     //loop while DR register in not empty
   while (SPI_GetFlagStatus(SPI1, SPI_FLAG_TXE) == RESET);
      
     //send redundant byte through the SPI peripheral (clocks in response to first read)
   SPI_SendData(SPI1, 0x42);
     //wait to receive a byte
   while (SPI_GetFlagStatus(SPI1, SPI_FLAG_RXNE) == RESET);

   // Return the byte read from the SPI bus
   spiByte = SPI_ReceiveData(SPI1);  
#spi