SPI通讯中，寄存器操作读写，SR寄存器为0，通讯中断

tiramisu0152 · 发表于 2021-8-24 08:54:15

STM32F401芯片，通过SPI读写外部芯片，单步操作可以正常运行，读写外部芯片都正常，当连续读的时候就会卡主，原因是SPI的SR寄存器为0；不知道怎么解决。用HAL库不存在问题，用寄存器操作就出现了。void SPIWriteDWord (UINT16 Address, UINT32 Val)
{
UINT32_VAL dwData;
UINT16_VAL wAddr;
UINT32_VAL command;
UINT8    none;
wAddr.Val  = Address;
dwData.Val = Val;
//Assert CS line
CSLOW();
//Write Command
while((SPI1->SR & 2) ==0); //TXE
SPI1->DR = CMD_SERIAL_WRITE;
while((SPI1->SR & 2) ==0); //TXE
SPI1->DR = wAddr.v[1];
while((SPI1->SR & 2) ==0); //TXE
SPI1->DR = wAddr.v[0];
//Write Bytes
SPI_WRITE_DATA(dwData.v,4);
//De-Assert CS line
while((SPI1->SR & 2) == 0);
while((SPI1->SR & 80) == 0);
CSHIGH();
}

void SPI_WRITE_DATA(UINT8* data,int size)
{
  int i;
  for(i = 0;i < size;i++)
  {
while((SPI1->SR & 1 << 1) ==0); //TXE
SPI1->DR = data;
  }
}