+

来自「Visual C++串口通信开发入门与编程实践」· 代码 · 共 26 行

int check(int crc, char *buf, int sz)
{
  unsigned tcrc;
  int i;
  char cks;
  if (crc)
  {
    crc = (unsigned)crc16_ccitt(buf, sz);
    tcrc = (buf[sz] << 8) + buf[sz + l];
    if (crc == tcrc)
      return 1;
  }
  else
  {
    cks = 0;
    for (i = 0; i < sz; ++i)
    {
      cks += buf[i];
    }

    if (cks == buf[sz])
      return 1;
  }
  return 0;
}