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modbus crc¼ÆË㹤¾ß

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2025-05-03

CRC-16(Ñ­»·ÏµÍ³³ÁÓ಻ÕýȷУ¼ì)

¡¡¡¡³ÁÓàÑ­»·Âë(CRC)°üÀ¨2¸ö×Ö½ÚÊý£¬¼´16λ¶þ½øÖÆ¡£CRCÂëÓÉÍÆËÍ»úÆ÷É豸¼ÆË㣬Ö÷ÅÓÚ·¢ËͶÌÐŵÄβ¶Ë¡£½ÓÊÜÐÅÏ¢ÄÚÈݵÄ×°±¸ÔÙÔٴμÆËã½ÓÊܵ½ÐÅÏ¢µÄCRCÂ룬½ÏΪ¼ÆËã»ñµÃµÄCRCÂëÊDz»ÊÇÓë½ÓÊܵ½µÄÏà·ûºÏ£¬¼ÙÈç¶þÕß²»Ïà·ûºÏ£¬Ôò˵Ã÷´íÎó¡£

¡¡¡¡ÔÚ¿ªÕ¹CRCÂë¼ÆËãʱ½öÓÃ8λÊý¾Ýλ¡£Æðֹ룬ÖÕֹλ£¬ÆæÅ¼Ð£ÑéλҲ²»²Î¼ÓCRCÂë¼ÆËã¡£

¡¡¡¡¼ÆËãCRCÂëµÄÁ÷³ÌΪ£º

¡¡¡¡¢Ù Ô¤Éè16λ¼Ä´æÆ÷ΪʮÁù½øÖÆFFFF(¼´È«Îª1)¡£³Æ´Ë¼Ä´æÆ÷ΪCRC¼Ä´æÆ÷¡£

¡¡¡¡¢Ú °ÑµÚÒ»¸ö8λÊý¾ÝÐÅÏ¢Óë16λCRC¼Ä´æÆ÷µÄµÍλÏàÒì»òÔËË㣬°Ñ½Y¹û·ÅÔÚCRC¼Ä´æÆ÷¡£

¡¡¡¡¢Û °Ñ¼Ä´æÆ÷µÄƒÈÈÝÓÒÒÆÒ»Î»£¬ÓÃ0ÃÖ²¹×î´ó룬²éÑé×îµÍλ¡£

¡¡¡¡¢Ü ¼ÙÈç×îµÍλΪ0£º·´¸´µÚ3²½£¬ÔÙ¶ÈÓÒÒÆÒ»Î»£»¼ÙÈç×îµÍλΪ1£ºCRC¼Ä´æÆ÷Óë´úÊýʽA001(1010 0000 0000 0001)¿ªÕ¹Òì»òÔËËã¡£

¡¡¡¡¢Ý ·´¸´Á÷³Ì¢ÛºÍ¢Ü£¬Ö±ÖÁÓÒÒÆ8´Î£¬ÄÇÑùÈ«²¿8λÊý¾ÝÐÅÏ¢ËùÓÐͨ¹ýÁ˽â¾ö¡£

¡¡¡¡¢Þ ·´¸´Á÷³Ì¢Úµ½¢Ý£¬¿ªÕ¹ÏÂÒ»¸ö8λÊý¾ÝÐÅÏ¢µÄ½â¾ö¡£

¡¡¡¡¢ß ×îÖÕ»ñµÃµÄCRC¼Ä´æÆ÷µÄÖµ¼´ÊÇCRCÂë¡£

¡¡¡¡¢à ½«CRCÂë·ÖΪ¸ß8λºÍµÍ8룬°´µÍλÔÚÏÈ£¬ÉÏλºóÃæ£¬½«ËûÃǼӵ½´«ÊäÊý¾ÝÒÔºó¡£

Á¢¼´·¨×ª»¯³É±àÂ룺

unsigned short crc_16(unsigned char *Array, unsigned char *Rcvbuf,unsigned int Len)

{

unsigned int IX,IY,CRC;

CRC=0xFFFF;//set all 1

if (Len=0)

CRC = 0;

else

{

Len--;

for (IX=0;IX=Len;IX )

{

CRC=CRC^(unsigned int)(Array[IX]);

for(IY=0;IY=7;IY )

{

if ((CRC1)!=0 )

CRC=(CRC1)^0xA001;

else

CRC=CRC1; //

}

}

}

Rcvbuf[0] = (CRC 0xff00)8;//¸ß²¿Î»

Rcvbuf[1] = (CRC 0x00ff); //µÍλÖÃ

CRC= Rcvbuf[0]8;

CRC = Rcvbuf[1];

return CRC;

}

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