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GD32F103VC替换ST32F103VC后，SPI读出的数全是0xff

win12345688992021-06-03

用ST芯片，SPI读取正常。换成GD芯片后，按照官方提供的GD和ST差异表，修改了程序，u8 SPI_FLASH_SendByte(u8 byte) 返回值全是0xff，有人遇到过这种情况吗？

u8 SPI_FLASH_SendByte(u8 byte) //
{

/* Loop while DR register in not emplty */
while ((SPI1->SR & SPI_I2S_FLAG_TXE) == 0);
  /* Send byte through the SPI1 peripheral */
SPI1->DR =byte;
  /* Wait to receive a byte */
while ((SPI1->SR & SPI_I2S_FLAG_RXNE) == 0);
  /* Return the byte read from the SPI bus */
return SPI1->DR;
}

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win1234568899

void SPI_FLASH_BufferRead(u8* pBuffer, u32 ReadAddr, u16 NumByteToRead)
{
//Select the FLASH: Chip Select low
//GPIOA->BRR = FLASH_CS;
SPI_FLASH_CS_LOW();

/* Send "Read from Memory " instruction */
SPI_FLASH_SendByte(READ);

/* Send ReadAddr high nibble address byte to read from */
SPI_FLASH_SendByte((ReadAddr & 0xFF0000) >> 16);
/* Send ReadAddr medium nibble address byte to read from */
SPI_FLASH_SendByte((ReadAddr& 0xFF00) >> 8);
/* Send ReadAddr low nibble address byte to read from */
SPI_FLASH_SendByte(ReadAddr & 0xFF);

while(NumByteToRead--) /* while there is data to be read */
{
/* Read a byte from the FLASH */
*pBuffer = SPI_FLASH_SendByte(Dummy_Byte);
/* Point to the next location where the byte read will be saved */
pBuffer++;
}

//Deselect the FLASH: Chip Select high
// GPIOA->BSRR = FLASH_CS;
SPI_FLASH_CS_HIGH();

}

SPI_FLASH_SendByte(Dummy_Byte)读到的全是0xff

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2021-06-03

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