串口调试助手CRC16_MODBUS校验码计算

最新推荐文章于 2025-04-14 09:43:55 发布

sudaroot

最新推荐文章于 2025-04-14 09:43:55 发布

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本文链接：https://blog.youkuaiyun.com/sudaroot/article/details/103635740

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C语言：

void InvertUint8(unsigned char *dBuf, unsigned char *srcBuf)
{
    int i;
    unsigned char tmp[4];
    tmp[0] = 0;

    for(i = 0; i < 8; i++)
    {
        if(srcBuf[0] & (1 << i))
            tmp[0] |= 1 << (7 - i);
    }

    dBuf[0] = tmp[0];

}
void InvertUint16(unsigned short *dBuf, unsigned short *srcBuf)
{
    int i;
    unsigned short tmp[4];
    tmp[0] = 0;

    for(i = 0; i < 16; i++)
    {
        if(srcBuf[0] & (1 << i))
            tmp[0] |= 1 << (15 - i);
    }

    dBuf[0] = tmp[0];
}


unsigned short CRC16_MODBUS(unsigned char *puchMsg, unsigned int usDataLen)
{
    unsigned short wCRCin = 0xFFFF;
    unsigned short wCPoly = 0x8005;
    unsigned char wChar = 0;

    while (usDataLen--)
    {
        wChar = *(puchMsg++);
        InvertUint8(&wChar, &wChar);
        wCRCin ^= (wC