请问在使用AD7768的时候，怎么做CRC检验？

AD7779和AD7768的CRC的算法一样，应该是你的CRC函数写错了。下面的函数供参考：
#define AD7768_CRC8_POLYNOMIAL_REPRESENTATION 0x07
unsigned char AD7768_ComputeCRC8(unsigned long * pBuf, unsigned short bufSize)
{
unsigned long i   = 0;
unsigned char crc = 0xFF;//***
while(bufSize)
{
  for(i = 0x800000; i != 0x000000; i >>= 1)
  {
   if(((crc & 0x80) != 0) != ((*pBuf & i) != 0)) /* MSB of CRC register XOR input Bit from Data */
   {
    crc <<= 1;
    crc ^= AD7768_CRC8_POLYNOMIAL_REPRESENTATION;
   }
   else
   {
    crc <<= 1;
   }
  }
  pBuf++;
  bufSize--;
}
return crc;
}