F103精英板，读取SPI—flash的8位Device ID没问题，读取JEDEC ID和手册不一致

鼠鼠爱玩嵌入式 · 发表于 2022-12-9 20:52:14

抱歉，研究半天没能发出来图片。

uint8_t SPI_FLASH_WriteByte(uint8_t data)
{
u8 i = 0
while(SPI_I2S_GetFlagStatus(SPI_FLASH,SPI_I2S_FLAG_TXE) == RESET)
      {
            i++;
            if(i>200) return 0;
      };
SPI_I2S_SendData(SPI_FLASH,data);
      i = 0;
while(SPI_I2S_GetFlagStatus(SPI_FLASH,SPI_I2S_FLAG_RXNE) == RESET)
      {
            i++;
            if(i>200) return 0;
      };
return SPI_I2S_ReceiveData(SPI_FLASH);
}

uint8_t SPI_Get_JEDEC_ID()
{
u8 rec = 0;
SPI_FLASH_CS_LOW;
SPI_FLASH_WriteByte(0xAB);
SPI_FLASH_WriteByte(DUMMY);
SPI_FLASH_WriteByte(DUMMY);
SPI_FLASH_WriteByte(DUMMY);
return SPI_FLASH_WriteByte(DUMMY);

}

这样用串口打印出来的Device ID和手册一样，是0x17;

现在读取JEDEC ID
uint32_t SPI_Get_JEDEC_ID()
{
u32 rec = 0;
SPI_FLASH_WriteByte(0x9F);
rec = SPI_FLASH_WriteByte(DUMMY);//SPI_FLASH_ReceiveByte();
rec <<= 8;
rec |= SPI_FLASH_WriteByte(DUMMY);//SPI_FLASH_ReceiveByte();
rec <<= 8;
rec |= SPI_FLASH_WriteByte(DUMMY);//SPI_FLASH_ReceiveByte();
SPI_FLASH_CS_HIGH;
return rec;
}

用串口读取的是0x522118,实际手册上应该是0xEF4018，实在费解，希望大佬指点一下，是否是读取方式有问题