求助：STM32 SPI读不到数据

只看该作者 · 2018-12-21 07:55

ARM芯片是STM32F103RE，要读取的芯片为SCC2230。
SCC2230的CS接PC5，SCK接PA5，MISO接PA6，MOSI接PA7。中间都通过电阻隔离。
源码如下：
void scc2230_init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
SPI_InitTypeDef  SPI_InitStructure;

RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOC, ENABLE );
RCC_APB2PeriphClockCmd( RCC_APB2Periph_SPI1,  ENABLE );

//SCK
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
   //MISO
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_Init(GPIOA, &GPIO_InitStructure);
//MOSI
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
GPIO_Init(GPIOA, &GPIO_InitStructure);//³õÊ¼»¯GPIO

//CS
GPIO_InitStructure.GPIO_Pin =GPIO_Pin_5;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP;
GPIO_Init(GPIOC, &GPIO_InitStructure);

GPIO_SetBits(GPIOC,GPIO_Pin_5);

SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_16b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &SPI_InitStructure);

SPI_Cmd(SPI1, ENABLE);

}

int main(void)
{
uint16_t rcv_scc1=0;
uint16_t rcv_scc2=0;
int rcv_data32=0;

scc2230_init();

  while(1)
{

   //SCC2230
GPIO_ResetBits(GPIOC,GPIO_Pin_5);  //ÀµÍÊ¹ÄÜ
while(SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE) == RESET);
  SPI_I2S_SendData(SPI1, 0xFF);
while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);
// while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) == SET);

rcv_scc1 = SPI_I2S_ReceiveData(SPI1);
rcv_scc2 = SPI_I2S_ReceiveData(SPI1);

      rcv_data32 = (rcv_scc1<<16) + rcv_scc2;
}

}

问题是：发送和接收状态查询都会死循环。如果将查询去掉，读到的数据也是0。
请大家帮忙看看，谢谢！