读取spi数据的代码出错

亲爱的大家，
这是我读取spi数据的代码：
uint8_t ti_TDC1000_SPIByteReadReg（uint8_t addr）

{
uint8_t read_byte，inst;
uint8_t dummy = 0x00;

inst = TDC1000_READ_BIT＆amp;地址; //读取时确保bit6为0
// GPIO_ResetBits（TI_TDC1000_CSn_PORT，TI_TDC1000_CSn_PIN）; // CS enablewhile（SPI_GetFlagStatus（SPI1，SPI_FLAG_TXE）== RESET）;

SPI_SendData（SPI1，inst）; while（SPI_GetFlagStatus（SPI1，SPI_FLAG_TXE）== RESET）;

SPI_SendData（SPI1，dummy）;
/ *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* /
read_byte = SPI_ReceiveData（SPI1）;返回read_byte;
}
我使用示波器，看到数据读取= 0x45，但在我的代码中
read_byte alway = 0xFF，我认为当spi收到数据时出错了。



以下为原文




Dear all,
here is my code to read spi data:
uint8_t TI_TDC1000_SPIByteReadReg(uint8_t addr)

{
uint8_t read_byte,inst;
uint8_t dummy = 0x00;

inst = TDC1000_READ_BIT & addr; // for read make sure bit6 is 0
//GPIO_ResetBits(TI_TDC1000_CSn_PORT ,TI_TDC1000_CSn_PIN); // CS enablewhile (SPI_GetFlagStatus(SPI1, SPI_FLAG_TXE)== RESET);

SPI_SendData(SPI1, inst);while (SPI_GetFlagStatus(SPI1, SPI_FLAG_TXE)== RESET);

SPI_SendData(SPI1, dummy);
/* Wait to receive a byte */
while (SPI_GetFlagStatus(SPI1, SPI_FLAG_RXNE) == RESET);
/* Return the byte read from the SPI bus */
read_byte = SPI_ReceiveData(SPI1);return read_byte;
}
I using oscilloscope and see that the data is read = 0x45, but in my code
read_byte alway = 0xFF, I think somewhere wrong when spi recieve data.