21ic电子技术开发论坛 › 单片机与嵌入式系统 › Microchip › PIC 单片机CRC校验程序(转)
返回列表 发新帖我要提问

PIC 单片机CRC校验程序(转)

[复制链接]
6644|16
 楼主| paul1983 发表于 2008-12-17 22:57 | 显示全部楼层 |阅读模式
pic, 单片机C, 校验程序, CRC, TE
#include&nbsp;&ltP16CE625.INC&gt<br /><br />;-------------------------------<br />&nbsp;&nbsp;&nbsp;&nbsp;cblock&nbsp;&nbsp;&nbsp;&nbsp;0x20<br />datBuff:8&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;assign&nbsp;8&nbsp;byte&nbsp;data&nbsp;buffer<br />bit_cnt&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;bit&nbsp;counting&nbsp;<br />CRC_COUNT&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;number&nbsp;of&nbsp;bytes&nbsp;for&nbsp;CRC<br />CRC_RESULT&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;CRC&nbsp;resulr<br />crc_temp&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;temporary&nbsp;data&nbsp;buffer&nbsp;during&nbsp;CRC<br />&nbsp;&nbsp;&nbsp;&nbsp;endc<br /><br />;-------------------------------<br />#define&nbsp;&nbsp;&nbsp;&nbsp;skp0&nbsp;&nbsp;&nbsp;&nbsp;btfsc<br />#define&nbsp;&nbsp;&nbsp;&nbsp;skp1&nbsp;&nbsp;&nbsp;&nbsp;btfss<br /><br /><br />;===============================<br />&nbsp;&nbsp;&nbsp;&nbsp;org&nbsp;&nbsp;&nbsp;&nbsp;0x000<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;movlw&nbsp;&nbsp;&nbsp;&nbsp;.7<br />&nbsp;&nbsp;&nbsp;&nbsp;movwf&nbsp;&nbsp;&nbsp;&nbsp;CRC_COUNT<br />&nbsp;&nbsp;&nbsp;&nbsp;movlw&nbsp;&nbsp;&nbsp;&nbsp;datBuff<br />&nbsp;&nbsp;&nbsp;&nbsp;movwf&nbsp;&nbsp;&nbsp;&nbsp;FSR&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;FSR&nbsp;point&nbsp;to&nbsp;data&nbsp;buffer<br />&nbsp;&nbsp;&nbsp;&nbsp;call&nbsp;&nbsp;&nbsp;&nbsp;CRC_CHECK<br />&nbsp;&nbsp;&nbsp;&nbsp;movwf&nbsp;&nbsp;&nbsp;&nbsp;datBuff+7<br />&nbsp;&nbsp;&nbsp;&nbsp;goto&nbsp;&nbsp;&nbsp;&nbsp;$<br /><br />;===============================<br />;CHECK&nbsp;THE&nbsp;CRC&nbsp;FOR&nbsp;?&nbsp;BYTES&nbsp;DATA<br />;For&nbsp;the&nbsp;polynomial&nbsp;of&nbsp;X^8&nbsp;+&nbsp;X^5&nbsp;+&nbsp;X^4&nbsp;+&nbsp;1<br />;Derived&nbsp;from&nbsp;Dallas's&nbsp;iButton&nbsp;standard<br />;Before&nbsp;calling,&nbsp;FSR&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=&nbsp;data&nbsp;buffer<br />;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CRC_COUNT&nbsp;=&nbsp;number&nbsp;of&nbsp;bytes&nbsp;for&nbsp;CRC<br />CRC_CHECK&nbsp;&nbsp;&nbsp;&nbsp;;~~~~~~~~~~~~~~~<br />&nbsp;&nbsp;&nbsp;&nbsp;clrf&nbsp;&nbsp;&nbsp;&nbsp;CRC_RESULT&nbsp;&nbsp;&nbsp;&nbsp;;initialize&nbsp;the&nbsp;CRC&nbsp;buffer<br />_crc_00<br />&nbsp;&nbsp;&nbsp;&nbsp;movlw&nbsp;&nbsp;&nbsp;&nbsp;.8&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;number&nbsp;of&nbsp;bits&nbsp;for&nbsp;one&nbsp;byte<br />&nbsp;&nbsp;&nbsp;&nbsp;movwf&nbsp;&nbsp;&nbsp;&nbsp;bit_cnt&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;set&nbsp;bit&nbsp;counter<br />&nbsp;&nbsp;&nbsp;&nbsp;movf&nbsp;&nbsp;&nbsp;&nbsp;INDF,w&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;get&nbsp;one&nbsp;data&nbsp;byte<br />&nbsp;&nbsp;&nbsp;&nbsp;movwf&nbsp;&nbsp;&nbsp;&nbsp;crc_temp&nbsp;&nbsp;&nbsp;&nbsp;;copy&nbsp;to&nbsp;temporary&nbsp;location<br />_crc_01<br />&nbsp;&nbsp;&nbsp;&nbsp;rrf&nbsp;&nbsp;&nbsp;&nbsp;crc_temp,f&nbsp;&nbsp;&nbsp;&nbsp;;get&nbsp;LSB&nbsp;in&nbsp;C<br />&nbsp;&nbsp;&nbsp;&nbsp;skpc&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;is&nbsp;this&nbsp;LSB=1?<br />&nbsp;&nbsp;&nbsp;&nbsp;goto&nbsp;&nbsp;&nbsp;&nbsp;_crc_02&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;go&nbsp;if&nbsp;LSB=0<br />&nbsp;&nbsp;&nbsp;&nbsp;movlw&nbsp;&nbsp;&nbsp;&nbsp;0x01&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;do&nbsp;if&nbsp;LSB=1<br />&nbsp;&nbsp;&nbsp;&nbsp;xorwf&nbsp;&nbsp;&nbsp;&nbsp;CRC_RESULT,f<br />_crc_02<br />&nbsp;&nbsp;&nbsp;&nbsp;rrf&nbsp;&nbsp;&nbsp;&nbsp;CRC_RESULT,w&nbsp;&nbsp;&nbsp;&nbsp;;get&nbsp;LSB&nbsp;of&nbsp;CRC<br />&nbsp;&nbsp;&nbsp;&nbsp;skpc&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;test&nbsp;LSB<br />&nbsp;&nbsp;&nbsp;&nbsp;goto&nbsp;&nbsp;&nbsp;&nbsp;_crc_03&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;go&nbsp;if&nbsp;LSB=0<br />&nbsp;&nbsp;&nbsp;&nbsp;movlw&nbsp;&nbsp;&nbsp;&nbsp;0x18&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;do&nbsp;if&nbsp;LSB=1<br />&nbsp;&nbsp;&nbsp;&nbsp;xorwf&nbsp;&nbsp;&nbsp;&nbsp;CRC_RESULT,f&nbsp;&nbsp;&nbsp;&nbsp;;polynomial&nbsp;implementation<br />_crc_03<br />&nbsp;&nbsp;&nbsp;&nbsp;rrf&nbsp;&nbsp;&nbsp;&nbsp;CRC_RESULT,w&nbsp;&nbsp;&nbsp;&nbsp;;whole&nbsp;byte&nbsp;right&nbsp;rotate<br />&nbsp;&nbsp;&nbsp;&nbsp;rrf&nbsp;&nbsp;&nbsp;&nbsp;CRC_RESULT,f<br />&nbsp;&nbsp;&nbsp;&nbsp;decfsz&nbsp;&nbsp;&nbsp;&nbsp;bit_cnt,f&nbsp;&nbsp;&nbsp;&nbsp;;bit&nbsp;counting<br />&nbsp;&nbsp;&nbsp;&nbsp;goto&nbsp;&nbsp;&nbsp;&nbsp;_crc_01&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;go&nbsp;on&nbsp;until&nbsp;aa&nbsp;8&nbsp;bits&nbsp;done<br />&nbsp;&nbsp;&nbsp;&nbsp;incf&nbsp;&nbsp;&nbsp;&nbsp;FSR,f&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;pointer&nbsp;update&nbsp;to&nbsp;next&nbsp;byte<br />&nbsp;&nbsp;&nbsp;&nbsp;decfsz&nbsp;&nbsp;&nbsp;&nbsp;CRC_COUNT,f&nbsp;&nbsp;&nbsp;&nbsp;;byte&nbsp;counting<br />&nbsp;&nbsp;&nbsp;&nbsp;goto&nbsp;&nbsp;&nbsp;&nbsp;_crc_00&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;go&nbsp;on&nbsp;until&nbsp;all&nbsp;byte&nbsp;done<br />&nbsp;&nbsp;&nbsp;&nbsp;movf&nbsp;&nbsp;&nbsp;&nbsp;CRC_RESULT,w&nbsp;&nbsp;&nbsp;&nbsp;;get&nbsp;CRC,&nbsp;Z&nbsp;set&nbsp;if&nbsp;CRC=0<br />&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;return&nbsp;with&nbsp;CRC&nbsp;in&nbsp;W<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;END
回复

收藏 举报

相关帖子
 楼主| paul1983 发表于 2008-12-17 22:59 | 显示全部楼层

循环冗余校验码

循环冗余校验码（Cylclic&nbsp;Redundancy&nbsp;Check&nbsp;Code),简称CRC码。常用的CRC数有8，16，32，CRC位数越大，数据越不易受干扰，但运算时间加长。一般关于通信的书籍都有介绍。简单原理是将要传输的数据视为一堆连续位组成的一整个数值，并将此数值除一个特定的除数，通常以二进制表示，此除数称为衍生多项式（Generation&nbsp;Polynomial).<br />一般数据量不大时，使用Checksume验错方式就行了；数据量大时，就用CRC了；据理论统计，用CRC16时，超过17个连续位的错误侦测率为99。9969，小于此的为100。
回复

收藏 举报

 楼主| paul1983 发表于 2008-12-17 23:00 | 显示全部楼层

CRC-12 的生成多项式为

CRC-12&nbsp;的生成多项式为：P(x)=X^12&nbsp;X^11&nbsp;X^3&nbsp;X^2&nbsp;1
回复

收藏 举报

 楼主| paul1983 发表于 2008-12-17 23:00 | 显示全部楼层

CRC 源码

CRC&nbsp;MOV&nbsp;DPH,&nbsp;#table&nbsp;;&nbsp;指向余式表下半区<br />MOV&nbsp;DPL,&nbsp;R0&nbsp;;&nbsp;指向对应单元<br />CLR&nbsp;A&nbsp;;<br />MOVC&nbsp;A,&nbsp;@A&nbsp;DPTR&nbsp;;&nbsp;读余式的高字节<br />XRL&nbsp;A,&nbsp;R1&nbsp;;&nbsp;计算余式的高字节<br />MOV&nbsp;R0,&nbsp;A&nbsp;;&nbsp;存入R0<br />INC&nbsp;DPH&nbsp;;&nbsp;指向余式表上半区<br />CLR&nbsp;A&nbsp;;<br />MOVC&nbsp;A,&nbsp;@A&nbsp;DPTR&nbsp;;&nbsp;读余式的低字节<br />XRL&nbsp;A,&nbsp;R2&nbsp;;&nbsp;计算余式的低字节<br />MOV&nbsp;R1,&nbsp;A&nbsp;;&nbsp;存入R1<br />RET
回复

收藏 举报

 楼主| paul1983 发表于 2008-12-17 23:01 | 显示全部楼层

查表法

<br />unsigned&nbsp;int&nbsp;UpdateCRC(unsigned&nbsp;char&nbsp;byte,unsigned&nbsp;int&nbsp;crc);<br /><br />#include&nbsp;&ltstdio.h&gt<br />#include&nbsp;&quot;crc16.h&quot;<br /><br />static&nbsp;code&nbsp;unsigned&nbsp;int&nbsp;Crc16Table[256]&nbsp;=<br />{<br />0x0000,&nbsp;0x1021,&nbsp;0x2042,&nbsp;0x3063,&nbsp;0x4084,&nbsp;0x50a5,&nbsp;0x60c6,&nbsp;0x70e7,<br />0x8108,&nbsp;0x9129,&nbsp;0xa14a,&nbsp;0xb16b,&nbsp;0xc18c,&nbsp;0xd1ad,&nbsp;0xe1ce,&nbsp;0xf1ef,<br />0x1231,&nbsp;0x0210,&nbsp;0x3273,&nbsp;0x2252,&nbsp;0x52b5,&nbsp;0x4294,&nbsp;0x72f7,&nbsp;0x62d6,<br />0x9339,&nbsp;0x8318,&nbsp;0xb37b,&nbsp;0xa35a,&nbsp;0xd3bd,&nbsp;0xc39c,&nbsp;0xf3ff,&nbsp;0xe3de,<br />0x2462,&nbsp;0x3443,&nbsp;0x0420,&nbsp;0x1401,&nbsp;0x64e6,&nbsp;0x74c7,&nbsp;0x44a4,&nbsp;0x5485,<br />0xa56a,&nbsp;0xb54b,&nbsp;0x8528,&nbsp;0x9509,&nbsp;0xe5ee,&nbsp;0xf5cf,&nbsp;0xc5ac,&nbsp;0xd58d,<br />0x3653,&nbsp;0x2672,&nbsp;0x1611,&nbsp;0x0630,&nbsp;0x76d7,&nbsp;0x66f6,&nbsp;0x5695,&nbsp;0x46b4,<br />0xb75b,&nbsp;0xa77a,&nbsp;0x9719,&nbsp;0x8738,&nbsp;0xf7df,&nbsp;0xe7fe,&nbsp;0xd79d,&nbsp;0xc7bc,<br />0x48c4,&nbsp;0x58e5,&nbsp;0x6886,&nbsp;0x78a7,&nbsp;0x0840,&nbsp;0x1861,&nbsp;0x2802,&nbsp;0x3823,<br />0xc9cc,&nbsp;0xd9ed,&nbsp;0xe98e,&nbsp;0xf9af,&nbsp;0x8948,&nbsp;0x9969,&nbsp;0xa90a,&nbsp;0xb92b,<br />0x5af5,&nbsp;0x4ad4,&nbsp;0x7ab7,&nbsp;0x6a96,&nbsp;0x1a71,&nbsp;0x0a50,&nbsp;0x3a33,&nbsp;0x2a12,<br />0xdbfd,&nbsp;0xcbdc,&nbsp;0xfbbf,&nbsp;0xeb9e,&nbsp;0x9b79,&nbsp;0x8b58,&nbsp;0xbb3b,&nbsp;0xab1a,<br />0x6ca6,&nbsp;0x7c87,&nbsp;0x4ce4,&nbsp;0x5cc5,&nbsp;0x2c22,&nbsp;0x3c03,&nbsp;0x0c60,&nbsp;0x1c41,<br />0xedae,&nbsp;0xfd8f,&nbsp;0xcdec,&nbsp;0xddcd,&nbsp;0xad2a,&nbsp;0xbd0b,&nbsp;0x8d68,&nbsp;0x9d49,<br />0x7e97,&nbsp;0x6eb6,&nbsp;0x5ed5,&nbsp;0x4ef4,&nbsp;0x3e13,&nbsp;0x2e32,&nbsp;0x1e51,&nbsp;0x0e70,<br />0xff9f,&nbsp;0xefbe,&nbsp;0xdfdd,&nbsp;0xcffc,&nbsp;0xbf1b,&nbsp;0xaf3a,&nbsp;0x9f59,&nbsp;0x8f78,<br />0x9188,&nbsp;0x81a9,&nbsp;0xb1ca,&nbsp;0xa1eb,&nbsp;0xd10c,&nbsp;0xc12d,&nbsp;0xf14e,&nbsp;0xe16f,<br />0x1080,&nbsp;0x00a1,&nbsp;0x30c2,&nbsp;0x20e3,&nbsp;0x5004,&nbsp;0x4025,&nbsp;0x7046,&nbsp;0x6067,<br />0x83b9,&nbsp;0x9398,&nbsp;0xa3fb,&nbsp;0xb3da,&nbsp;0xc33d,&nbsp;0xd31c,&nbsp;0xe37f,&nbsp;0xf35e,<br />0x02b1,&nbsp;0x1290,&nbsp;0x22f3,&nbsp;0x32d2,&nbsp;0x4235,&nbsp;0x5214,&nbsp;0x6277,&nbsp;0x7256,<br />0xb5ea,&nbsp;0xa5cb,&nbsp;0x95a8,&nbsp;0x8589,&nbsp;0xf56e,&nbsp;0xe54f,&nbsp;0xd52c,&nbsp;0xc50d,<br />0x34e2,&nbsp;0x24c3,&nbsp;0x14a0,&nbsp;0x0481,&nbsp;0x7466,&nbsp;0x6447,&nbsp;0x5424,&nbsp;0x4405,<br />0xa7db,&nbsp;0xb7fa,&nbsp;0x8799,&nbsp;0x97b8,&nbsp;0xe75f,&nbsp;0xf77e,&nbsp;0xc71d,&nbsp;0xd73c,<br />0x26d3,&nbsp;0x36f2,&nbsp;0x0691,&nbsp;0x16b0,&nbsp;0x6657,&nbsp;0x7676,&nbsp;0x4615,&nbsp;0x5634,<br />0xd94c,&nbsp;0xc96d,&nbsp;0xf90e,&nbsp;0xe92f,&nbsp;0x99c8,&nbsp;0x89e9,&nbsp;0xb98a,&nbsp;0xa9ab,<br />0x5844,&nbsp;0x4865,&nbsp;0x7806,&nbsp;0x6827,&nbsp;0x18c0,&nbsp;0x08e1,&nbsp;0x3882,&nbsp;0x28a3,<br />0xcb7d,&nbsp;0xdb5c,&nbsp;0xeb3f,&nbsp;0xfb1e,&nbsp;0x8bf9,&nbsp;0x9bd8,&nbsp;0xabbb,&nbsp;0xbb9a,<br />0x4a75,&nbsp;0x5a54,&nbsp;0x6a37,&nbsp;0x7a16,&nbsp;0x0af1,&nbsp;0x1ad0,&nbsp;0x2ab3,&nbsp;0x3a92,<br />0xfd2e,&nbsp;0xed0f,&nbsp;0xdd6c,&nbsp;0xcd4d,&nbsp;0xbdaa,&nbsp;0xad8b,&nbsp;0x9de8,&nbsp;0x8dc9,<br />0x7c26,&nbsp;0x6c07,&nbsp;0x5c64,&nbsp;0x4c45,&nbsp;0x3ca2,&nbsp;0x2c83,&nbsp;0x1ce0,&nbsp;0x0cc1,<br />0xef1f,&nbsp;0xff3e,&nbsp;0xcf5d,&nbsp;0xdf7c,&nbsp;0xaf9b,&nbsp;0xbfba,&nbsp;0x8fd9,&nbsp;0x9ff8,<br />0x6e17,&nbsp;0x7e36,&nbsp;0x4e55,&nbsp;0x5e74,&nbsp;0x2e93,&nbsp;0x3eb2,&nbsp;0x0ed1,&nbsp;0x1ef0<br />};<br /><br /><br />unsigned&nbsp;int&nbsp;UpdateCrc16(unsigned&nbsp;char&nbsp;Octet,unsigned&nbsp;int&nbsp;CRC)<br />{<br />return&nbsp;Crc16Table[&nbsp;(CRC&nbsp;&gt&gt&nbsp;8)&nbsp;&&nbsp;255]&nbsp;^&nbsp;(CRC&nbsp;&lt&lt&nbsp;8)&nbsp;^&nbsp;Octet;<br />}<br /><br />unsigned&nbsp;int&nbsp;UpdateCRC(unsigned&nbsp;char&nbsp;Octet,unsigned&nbsp;int&nbsp;CRC)<br />{<br />return&nbsp;(CRC&nbsp;&lt&lt&nbsp;8)&nbsp;^&nbsp;Crc16Table[&nbsp;(CRC&nbsp;&gt&gt&nbsp;8)&nbsp;^&nbsp;Octet&nbsp;];<br />}<br />
回复

收藏 举报

 楼主| paul1983 发表于 2008-12-17 23:02 | 显示全部楼层

CRC 源码

_CRC:<br />MOV&nbsp;A,R7&nbsp;;CRC&nbsp;INPUT&nbsp;POINTER<br />MOV&nbsp;R1,A<br />MOV&nbsp;B,R5<br />MOV&nbsp;DPH,R6;#SRCADR&nbsp;;CRC&nbsp;INPUT&nbsp;PAGE&nbsp;ADDRESS<br />MOV&nbsp;DPL,R1<br />MOV&nbsp;RCRC2L,#0<br />MOV&nbsp;RCRC1H,#0<br />MOV&nbsp;RCRC1L,#0<br />CRCA:<br />MOVX&nbsp;A,@DPTR<br />XRL&nbsp;A,RCRC1H<br />XRL&nbsp;A,RCRC2L<br />MOV&nbsp;RXTEMP,A<br />MOV&nbsp;RCRC2L,RCRC1L<br />MOV&nbsp;DPTR,#CRCTAB1<br />MOVC&nbsp;A,@A&nbsp;DPTR<br />MOV&nbsp;RCRC1H,A<br />MOV&nbsp;A,RXTEMP<br />INC&nbsp;DPH<br />MOVC&nbsp;A,@A&nbsp;DPTR<br />MOV&nbsp;RCRC1L,A<br />MOV&nbsp;DPH,R6;#SRCADR&nbsp;;CRC&nbsp;INPUT&nbsp;PAGE&nbsp;ADDRESS<br />INC&nbsp;R1<br />MOV&nbsp;DPL,R1<br />MOV&nbsp;A,R1<br />CJNE&nbsp;A,B,CRCA<br /><br />MOV&nbsp;A,RCRC1H<br />XRL&nbsp;A,RCRC2L<br />CPL&nbsp;A<br />MOV&nbsp;RCRC1H,A<br /><br />MOV&nbsp;A,RCRC1L<br />CPL&nbsp;A<br />MOV&nbsp;RCRC1L,A<br /><br />MOV&nbsp;R6,RCRC1H<br />MOV&nbsp;R7,RCRC1L<br /><br />RET<br />;-------------------------------------------<br />CRCTAB1:<br />DB&nbsp;000H,089H,012H,09BH,024H,0ADH,036H,0BFH<br />DB&nbsp;048H,0C1H,05AH,0D3H,06CH,0E5H,07EH,0F7H<br />DB&nbsp;081H,008H,093H,01AH,0A5H,02CH,0B7H,03EH<br />DB&nbsp;0C9H,040H,0DBH,052H,0EDH,064H,0FFH,076H<br />DB&nbsp;002H,08BH,010H,099H,026H,0AFH,034H,0BDH<br />DB&nbsp;04AH,0C3H,058H,0D1H,06EH,0E7H,07CH,0F5H<br />DB&nbsp;083H,00AH,091H,018H,0A7H,02EH,0B5H,03CH<br />DB&nbsp;0CBH,042H,0D9H,050H,0EFH,066H,0FDH,074H<br />DB&nbsp;004H,08DH,016H,09FH,020H,0A9H,032H,0BBH<br />DB&nbsp;04CH,0C5H,05EH,0D7H,068H,0E1H,07AH,0F3H<br />DB&nbsp;085H,00CH,097H,01EH,0A1H,028H,0B3H,03AH<br />DB&nbsp;0CDH,044H,0DFH,056H,0E9H,060H,0FBH,072H<br />DB&nbsp;006H,08FH,014H,09DH,022H,0ABH,030H,0B9H<br />DB&nbsp;04EH,0C7H,05CH,0D5H,06AH,0E3H,078H,0F1H<br />DB&nbsp;087H,00EH,095H,01CH,0A3H,02AH,0B1H,038H<br />DB&nbsp;0CFH,046H,0DDH,054H,0EBH,062H,0F9H,070H<br />DB&nbsp;008H,081H,01AH,093H,02CH,0A5H,03EH,0B7H<br />DB&nbsp;040H,0C9H,052H,0DBH,064H,0EDH,076H,0FFH<br />DB&nbsp;089H,000H,09BH,012H,0ADH,024H,0BFH,036H<br />DB&nbsp;0C1H,048H,0D3H,05AH,0E5H,06CH,0F7H,07EH<br />DB&nbsp;00AH,083H,018H,091H,02EH,0A7H,03CH,0B5H<br />DB&nbsp;042H,0CBH,050H,0D9H,066H,0EFH,074H,0FDH<br />DB&nbsp;08BH,002H,099H,010H,0AFH,026H,0BDH,034H<br />DB&nbsp;0C3H,04AH,0D1H,058H,0E7H,06EH,0F5H,07CH<br />DB&nbsp;00CH,085H,01EH,097H,028H,0A1H,03AH,0B3H<br />DB&nbsp;044H,0CDH,056H,0DFH,060H,0E9H,072H,0FBH<br />DB&nbsp;08DH,004H,09FH,016H,0A9H,020H,0BBH,032H<br />DB&nbsp;0C5H,04CH,0D7H,05EH,0E1H,068H,0F3H,07AH<br />DB&nbsp;00EH,087H,01CH,095H,02AH,0A3H,038H,0B1H<br />DB&nbsp;046H,0CFH,054H,0DDH,062H,0EBH,070H,0F9H<br />DB&nbsp;08FH,006H,09DH,014H,0ABH,022H,0B9H,030H<br />DB&nbsp;0C7H,04EH,0D5H,05CH,0E3H,06AH,0F1H,078H<br /><br />CRCTAB2:<br />DB&nbsp;000H,011H,023H,032H,046H,057H,065H,074H<br />DB&nbsp;08CH,09DH,0AFH,0BEH,0CAH,0DBH,0E9H,0F8H<br />DB&nbsp;010H,001H,033H,022H,056H,047H,075H,064H<br />DB&nbsp;09CH,08DH,0BFH,0AEH,0DAH,0CBH,0F9H,0E8H<br />DB&nbsp;021H,030H,002H,013H,067H,076H,044H,055H<br />DB&nbsp;0ADH,0BCH,08EH,09FH,0EBH,0FAH,0C8H,0D9H<br />DB&nbsp;031H,020H,012H,003H,077H,066H,054H,045H<br />DB&nbsp;0BDH,0ACH,09EH,08FH,0FBH,0EAH,0D8H,0C9H<br />DB&nbsp;042H,053H,061H,070H,004H,015H,027H,036H<br />DB&nbsp;0CEH,0DFH,0EDH,0FCH,088H,099H,0ABH,0BAH<br />DB&nbsp;052H,043H,071H,060H,014H,005H,037H,026H<br />DB&nbsp;0DEH,0CFH,0FDH,0ECH,098H,089H,0BBH,0AAH<br />DB&nbsp;063H,072H,040H,051H,025H,034H,006H,017H<br />DB&nbsp;0EFH,0FEH,0CCH,0DDH,0A9H,0B8H,08AH,09BH<br />DB&nbsp;073H,062H,050H,041H,035H,024H,016H,007H<br />DB&nbsp;0FFH,0EEH,0DCH,0CDH,0B9H,0A8H,09AH,08BH<br />DB&nbsp;084H,095H,0A7H,0B6H,0C2H,0D3H,0E1H,0F0H<br />DB&nbsp;008H,019H,02BH,03AH,04EH,05FH,06DH,07CH<br />DB&nbsp;094H,085H,0B7H,0A6H,0D2H,0C3H,0F1H,0E0H<br />DB&nbsp;018H,009H,03BH,02AH,05EH,04FH,07DH,06CH<br />DB&nbsp;0A5H,0B4H,086H,097H,0E3H,0F2H,0C0H,0D1H<br />DB&nbsp;029H,038H,00AH,01BH,06FH,07EH,04CH,05DH<br />DB&nbsp;0B5H,0A4H,096H,087H,0F3H,0E2H,0D0H,0C1H<br />DB&nbsp;039H,028H,01AH,00BH,07FH,06EH,05CH,04DH<br />DB&nbsp;0C6H,0D7H,0E5H,0F4H,080H,091H,0A3H,0B2H<br />DB&nbsp;04AH,05BH,069H,078H,00CH,01DH,02FH,03EH<br />DB&nbsp;0D6H,0C7H,0F5H,0E4H,090H,081H,0B3H,0A2H<br />DB&nbsp;05AH,04BH,079H,068H,01CH,00DH,03FH,02EH<br />DB&nbsp;0E7H,0F6H,0C4H,0D5H,0A1H,0B0H,082H,093H<br />DB&nbsp;06BH,07AH,048H,059H,02DH,03CH,00EH,01FH<br />DB&nbsp;0F7H,0E6H,0D4H,0C5H,0B1H,0A0H,092H,083H<br />DB&nbsp;07BH,06AH,058H,049H,03DH,02CH,01EH,00FH<br /><br />end<br />
回复

收藏 举报

 楼主| paul1983 发表于 2008-12-17 23:02 | 显示全部楼层

CRC 源码

uint&nbsp;crc(uchar&nbsp;*&nbsp;byte,uchar&nbsp;nbyte)&nbsp;//CRC校验<br />{<br />uint&nbsp;data&nbsp;itemp=0;<br />uchar&nbsp;data&nbsp;i,j;<br />bit&nbsp;flag;<br />for(i=0;i&ltnbyte;i&nbsp;)<br />{<br />itemp^=(byte&lt&lt8);<br />for&nbsp;(j=0;j&lt8;j&nbsp;)<br />{<br />flag=itemp&0x8000;<br />itemp&lt&lt=1;<br />if(flag)<br />{<br />itemp^=0x1021;<br />}<br />}<br />}<br />return&nbsp;itemp;<br />}
回复

收藏 举报

 楼主| paul1983 发表于 2008-12-17 23:03 | 显示全部楼层

CRC 源码

CREATCRC:&nbsp;;&nbsp;-----&nbsp;CRC-16&nbsp;-----<br />MOV&nbsp;R2,#00H<br />MOV&nbsp;R3,#00H<br />CRCATER2:&nbsp;MOV&nbsp;A,@R0<br />XRL&nbsp;A,R3<br />LCALL&nbsp;CRCCRT1<br />XRL&nbsp;A,R2<br />MOV&nbsp;R3,A<br />MOV&nbsp;R2,B<br />INC&nbsp;R0<br />DJNZ&nbsp;R5,CRCATER2<br />MOV&nbsp;@R0,B<br />INC&nbsp;R0<br />MOV&nbsp;@R0,A<br />RET<br /><br />CRCCRT1:<br />MOV&nbsp;R7,#08H<br />MOV&nbsp;B,#00H<br />CRT1LOP1:&nbsp;CLR&nbsp;C<br />PUSH&nbsp;ACC<br />MOV&nbsp;A,B<br />RLC&nbsp;A<br />MOV&nbsp;B,A<br />POP&nbsp;ACC<br />RLC&nbsp;A<br />JNC&nbsp;CRT1LOP2<br />PUSH&nbsp;ACC<br />MOV&nbsp;A,B<br />XRL&nbsp;A,#CRCGENL<br />MOV&nbsp;B,A<br />POP&nbsp;ACC<br />XRL&nbsp;A,#CRCGENH<br />CRT1LOP2:&nbsp;DJNZ&nbsp;R7,CRT1LOP1<br />RET<br /><br />RECEIVE:<br />SETB&nbsp;F0<br />LCALL&nbsp;CREATCRC<br />MOV&nbsp;A,CCRC1<br />XRL&nbsp;A,@R0<br />JNZ&nbsp;ERRORCRC<br />INC&nbsp;R0<br />MOV&nbsp;A,CCRC2<br />XRL&nbsp;A,@R0<br />JNZ&nbsp;ERRORCRC<br />LJMP&nbsp;EEND<br />ERRORCRC:&nbsp;CLR&nbsp;F0<br />EEND:&nbsp;RET
回复

收藏 举报

 楼主| paul1983 发表于 2008-12-17 23:04 | 显示全部楼层

CRC 源码

1)&nbsp;求CRC码的运算采用模2运算,&nbsp;所谓模2运算就是不带进位和借位,&nbsp;因此加法和减法等价,实际上就是逻辑上的异或运算,&nbsp;除法可以用多次模2减法实现.<br /><br />2)&nbsp;所谓CRC码,&nbsp;就是把数据块左移16位,&nbsp;然后除以0x11021所得到的余数(CCITT推荐).<br /><br />3)&nbsp;据此写出以下的CRC的C程序.&nbsp;*ptr指向发送数据块的首地址,&nbsp;len是数据块以字节为单位的长度.<br /><br />uint&nbsp;cal_crc(uchar&nbsp;*ptr,&nbsp;uchar&nbsp;len)&nbsp;{<br />uint&nbsp;crc;<br />uchar&nbsp;i;<br /><br />crc=0;<br />while(len--!=0)&nbsp;{<br />for(i=0x80;&nbsp;i!=0;&nbsp;i/=2)&nbsp;{<br />if((crc&0x8000)!=0)&nbsp;{crc*=2;&nbsp;crc^=0x1021;}<br />else&nbsp;crc*=2;<br />if((*ptr&i)!=0)&nbsp;crc^=0x1021;<br />}<br />ptr&nbsp;;<br />}<br />return(crc);<br />}
回复

收藏 举报

 楼主| paul1983 发表于 2008-12-17 23:04 | 显示全部楼层

CRC校验算法

START&nbsp;EQU&nbsp;2000H&nbsp;;数据区首址（任意设置128字节数据）。<br />ERR&nbsp;BIT&nbsp;00H&nbsp;;出错标志。<br />ORG&nbsp;100H<br />LCALL&nbsp;CRCOUT&nbsp;;模拟发方生成CRC校验。<br />LCALL&nbsp;CHECK&nbsp;;模拟收方进行CRC校验，应该没有差错。<br />MOV&nbsp;DPTR,#START&nbsp;20H&nbsp;;模拟两个字节被破坏。<br />CLR&nbsp;A<br />MOVX&nbsp;@DPTR,A<br />INC&nbsp;DPTR<br />MOVX&nbsp;@DPTR,A<br />LCALL&nbsp;CHECK&nbsp;;再次模拟收方进行CRC校验，应该发现差错。<br />STOP:&nbsp;LJMP&nbsp;STOP<br />NOP<br />NOP<br />NOP<br />CRCOUT:&nbsp;MOV&nbsp;DPTR,#START&nbsp;80H&nbsp;;将CRC存放单元初始化为零。<br />CLR&nbsp;A<br />MOVX&nbsp;@DPTR,A<br />INC&nbsp;DPTR<br />MOVX&nbsp;@DPTR,A<br />LCALL&nbsp;CRC&nbsp;;计算CRC。<br />MOV&nbsp;DPTR,#START&nbsp;80H&nbsp;;将计算结果存放到数据块之后。<br />MOV&nbsp;A,R2<br />MOVX&nbsp;@DPTR,A<br />INC&nbsp;DPTR<br />MOV&nbsp;A,R3<br />MOVX&nbsp;@DPTR,A<br />RET<br />NOP<br />NOP<br />CRC:&nbsp;MOV&nbsp;DPTR,#START&nbsp;;（CRC计算模块）先取两字节数据，作为<br />MOVX&nbsp;A,@DPTR&nbsp;;最初的被除数。<br />MOV&nbsp;R2,A<br />INC&nbsp;DPTR<br />MOVX&nbsp;A,@DPTR<br />MOV&nbsp;R3,A<br />MOV&nbsp;R7,#80H&nbsp;;以后的128字节依次作为被除数的补充。<br />CRC1:&nbsp;INC&nbsp;DPTR<br />MOVX&nbsp;A,@DPTR&nbsp;;取一字节数据，作为被除数的补充。<br />MOV&nbsp;R4,A<br />MOV&nbsp;R5,#8&nbsp;;每字节要进行8次模2除法。<br />CRC2:&nbsp;MOV&nbsp;A,R4&nbsp;;三字节被除数的当前余数左移一位。<br />RLC&nbsp;A<br />MOV&nbsp;R4,A<br />MOV&nbsp;A,R3<br />RLC&nbsp;A<br />MOV&nbsp;R3,A<br />MOV&nbsp;A,R2<br />RLC&nbsp;A<br />MOV&nbsp;R2,A<br />JNC&nbsp;CRC3&nbsp;;移出的最高位是0，不用处理。<br />XRL&nbsp;A,#10H&nbsp;;移出的最高位是1，进行模2处理。<br />MOV&nbsp;R2,A<br />MOV&nbsp;A,R3<br />XRL&nbsp;A,#21H<br />MOV&nbsp;R3,A<br />CRC3:&nbsp;DJNZ&nbsp;R5,CRC2&nbsp;;处理完一个字节。<br />DJNZ&nbsp;R7,CRC1&nbsp;;处理完全部数据。<br />RET&nbsp;;CRC校验码在R2R3之中。<br />NOP<br />NOP<br />CHECK:&nbsp;CLR&nbsp;ERR&nbsp;;出错标志初始化。<br />LCALL&nbsp;CRC&nbsp;;计算CRC。<br />MOV&nbsp;A,R2&nbsp;;结果为零否？<br />ORL&nbsp;A,R3<br />JZ&nbsp;CHKE<br />SETB&nbsp;ERR&nbsp;;结果不为零,设立出错标志。<br />CHKE:&nbsp;RET<br />END
回复

收藏 举报

 楼主| paul1983 发表于 2008-12-17 23:05 | 显示全部楼层

crc16 keil

#include&nbsp;&quot;verity.h&quot;<br />static&nbsp;unsigned&nbsp;char&nbsp;auchCRCHi[]&nbsp;=&nbsp;{<br />0x00,&nbsp;0xC1,&nbsp;0x81,&nbsp;0x40,&nbsp;0x01,&nbsp;0xC0,&nbsp;0x80,&nbsp;0x41,&nbsp;0x01,&nbsp;0xC0,<br />0x80,&nbsp;0x41,&nbsp;0x00,&nbsp;0xC1,&nbsp;0x81,&nbsp;0x40,&nbsp;0x01,&nbsp;0xC0,&nbsp;0x80,&nbsp;0x41,<br />0x00,&nbsp;0xC1,&nbsp;0x81,&nbsp;0x40,&nbsp;0x00,&nbsp;0xC1,&nbsp;0x81,&nbsp;0x40,&nbsp;0x01,&nbsp;0xC0,<br />0x80,&nbsp;0x41,&nbsp;0x01,&nbsp;0xC0,&nbsp;0x80,&nbsp;0x41,&nbsp;0x00,&nbsp;0xC1,&nbsp;0x81,&nbsp;0x40,<br />0x00,&nbsp;0xC1,&nbsp;0x81,&nbsp;0x40,&nbsp;0x01,&nbsp;0xC0,&nbsp;0x80,&nbsp;0x41,&nbsp;0x00,&nbsp;0xC1,<br />0x81,&nbsp;0x40,&nbsp;0x01,&nbsp;0xC0,&nbsp;0x80,&nbsp;0x41,&nbsp;0x01,&nbsp;0xC0,&nbsp;0x80,&nbsp;0x41,<br />0x00,&nbsp;0xC1,&nbsp;0x81,&nbsp;0x40,&nbsp;0x01,&nbsp;0xC0,&nbsp;0x80,&nbsp;0x41,&nbsp;0x00,&nbsp;0xC1,<br />0x81,&nbsp;0x40,&nbsp;0x00,&nbsp;0xC1,&nbsp;0x81,&nbsp;0x40,&nbsp;0x01,&nbsp;0xC0,&nbsp;0x80,&nbsp;0x41,<br />0x00,&nbsp;0xC1,&nbsp;0x81,&nbsp;0x40,&nbsp;0x01,&nbsp;0xC0,&nbsp;0x80,&nbsp;0x41,&nbsp;0x01,&nbsp;0xC0,<br />0x80,&nbsp;0x41,&nbsp;0x00,&nbsp;0xC1,&nbsp;0x81,&nbsp;0x40,&nbsp;0x00,&nbsp;0xC1,&nbsp;0x81,&nbsp;0x40,<br />0x01,&nbsp;0xC0,&nbsp;0x80,&nbsp;0x41,&nbsp;0x01,&nbsp;0xC0,&nbsp;0x80,&nbsp;0x41,&nbsp;0x00,&nbsp;0xC1,<br />0x81,&nbsp;0x40,&nbsp;0x01,&nbsp;0xC0,&nbsp;0x80,&nbsp;0x41,&nbsp;0x00,&nbsp;0xC1,&nbsp;0x81,&nbsp;0x40,<br />0x00,&nbsp;0xC1,&nbsp;0x81,&nbsp;0x40,&nbsp;0x01,&nbsp;0xC0,&nbsp;0x80,&nbsp;0x41,&nbsp;0x01,&nbsp;0xC0,<br />0x80,&nbsp;0x41,&nbsp;0x00,&nbsp;0xC1,&nbsp;0x81,&nbsp;0x40,&nbsp;0x00,&nbsp;0xC1,&nbsp;0x81,&nbsp;0x40,<br />0x01,&nbsp;0xC0,&nbsp;0x80,&nbsp;0x41,&nbsp;0x00,&nbsp;0xC1,&nbsp;0x81,&nbsp;0x40,&nbsp;0x01,&nbsp;0xC0,<br />0x80,&nbsp;0x41,&nbsp;0x01,&nbsp;0xC0,&nbsp;0x80,&nbsp;0x41,&nbsp;0x00,&nbsp;0xC1,&nbsp;0x81,&nbsp;0x40,<br />0x00,&nbsp;0xC1,&nbsp;0x81,&nbsp;0x40,&nbsp;0x01,&nbsp;0xC0,&nbsp;0x80,&nbsp;0x41,&nbsp;0x01,&nbsp;0xC0,<br />0x80,&nbsp;0x41,&nbsp;0x00,&nbsp;0xC1,&nbsp;0x81,&nbsp;0x40,&nbsp;0x01,&nbsp;0xC0,&nbsp;0x80,&nbsp;0x41,<br />0x00,&nbsp;0xC1,&nbsp;0x81,&nbsp;0x40,&nbsp;0x00,&nbsp;0xC1,&nbsp;0x81,&nbsp;0x40,&nbsp;0x01,&nbsp;0xC0,<br />0x80,&nbsp;0x41,&nbsp;0x00,&nbsp;0xC1,&nbsp;0x81,&nbsp;0x40,&nbsp;0x01,&nbsp;0xC0,&nbsp;0x80,&nbsp;0x41,<br />0x01,&nbsp;0xC0,&nbsp;0x80,&nbsp;0x41,&nbsp;0x00,&nbsp;0xC1,&nbsp;0x81,&nbsp;0x40,&nbsp;0x01,&nbsp;0xC0,<br />0x80,&nbsp;0x41,&nbsp;0x00,&nbsp;0xC1,&nbsp;0x81,&nbsp;0x40,&nbsp;0x00,&nbsp;0xC1,&nbsp;0x81,&nbsp;0x40,<br />0x01,&nbsp;0xC0,&nbsp;0x80,&nbsp;0x41,&nbsp;0x01,&nbsp;0xC0,&nbsp;0x80,&nbsp;0x41,&nbsp;0x00,&nbsp;0xC1,<br />0x81,&nbsp;0x40,&nbsp;0x00,&nbsp;0xC1,&nbsp;0x81,&nbsp;0x40,&nbsp;0x01,&nbsp;0xC0,&nbsp;0x80,&nbsp;0x41,<br />0x00,&nbsp;0xC1,&nbsp;0x81,&nbsp;0x40,&nbsp;0x01,&nbsp;0xC0,&nbsp;0x80,&nbsp;0x41,&nbsp;0x01,&nbsp;0xC0,<br />0x80,&nbsp;0x41,&nbsp;0x00,&nbsp;0xC1,&nbsp;0x81,&nbsp;0x40<br />}&nbsp;;<br />/*&nbsp;Table&nbsp;of&nbsp;CRC&nbsp;values&nbsp;for&nbsp;low-order&nbsp;byte&nbsp;*/<br />static&nbsp;char&nbsp;auchCRCLo[]&nbsp;=&nbsp;{<br />0x00,&nbsp;0xC0,&nbsp;0xC1,&nbsp;0x01,&nbsp;0xC3,&nbsp;0x03,&nbsp;0x02,&nbsp;0xC2,&nbsp;0xC6,&nbsp;0x06,<br />0x07,&nbsp;0xC7,&nbsp;0x05,&nbsp;0xC5,&nbsp;0xC4,&nbsp;0x04,&nbsp;0xCC,&nbsp;0x0C,&nbsp;0x0D,&nbsp;0xCD,<br />0x0F,&nbsp;0xCF,&nbsp;0xCE,&nbsp;0x0E,&nbsp;0x0A,&nbsp;0xCA,&nbsp;0xCB,&nbsp;0x0B,&nbsp;0xC9,&nbsp;0x09,<br />0x08,&nbsp;0xC8,&nbsp;0xD8,&nbsp;0x18,&nbsp;0x19,&nbsp;0xD9,&nbsp;0x1B,&nbsp;0xDB,&nbsp;0xDA,&nbsp;0x1A,<br />0x1E,&nbsp;0xDE,&nbsp;0xDF,&nbsp;0x1F,&nbsp;0xDD,&nbsp;0x1D,&nbsp;0x1C,&nbsp;0xDC,&nbsp;0x14,&nbsp;0xD4,<br />0xD5,&nbsp;0x15,&nbsp;0xD7,&nbsp;0x17,&nbsp;0x16,&nbsp;0xD6,&nbsp;0xD2,&nbsp;0x12,&nbsp;0x13,&nbsp;0xD3,<br />0x11,&nbsp;0xD1,&nbsp;0xD0,&nbsp;0x10,&nbsp;0xF0,&nbsp;0x30,&nbsp;0x31,&nbsp;0xF1,&nbsp;0x33,&nbsp;0xF3,<br />0xF2,&nbsp;0x32,&nbsp;0x36,&nbsp;0xF6,&nbsp;0xF7,&nbsp;0x37,&nbsp;0xF5,&nbsp;0x35,&nbsp;0x34,&nbsp;0xF4,<br />0x3C,&nbsp;0xFC,&nbsp;0xFD,&nbsp;0x3D,&nbsp;0xFF,&nbsp;0x3F,&nbsp;0x3E,&nbsp;0xFE,&nbsp;0xFA,&nbsp;0x3A,<br />0x3B,&nbsp;0xFB,&nbsp;0x39,&nbsp;0xF9,&nbsp;0xF8,&nbsp;0x38,&nbsp;0x28,&nbsp;0xE8,&nbsp;0xE9,&nbsp;0x29,<br />0xEB,&nbsp;0x2B,&nbsp;0x2A,&nbsp;0xEA,&nbsp;0xEE,&nbsp;0x2E,&nbsp;0x2F,&nbsp;0xEF,&nbsp;0x2D,&nbsp;0xED,<br />0xEC,&nbsp;0x2C,&nbsp;0xE4,&nbsp;0x24,&nbsp;0x25,&nbsp;0xE5,&nbsp;0x27,&nbsp;0xE7,&nbsp;0xE6,&nbsp;0x26,<br />0x22,&nbsp;0xE2,&nbsp;0xE3,&nbsp;0x23,&nbsp;0xE1,&nbsp;0x21,&nbsp;0x20,&nbsp;0xE0,&nbsp;0xA0,&nbsp;0x60,<br />0x61,&nbsp;0xA1,&nbsp;0x63,&nbsp;0xA3,&nbsp;0xA2,&nbsp;0x62,&nbsp;0x66,&nbsp;0xA6,&nbsp;0xA7,&nbsp;0x67,<br />0xA5,&nbsp;0x65,&nbsp;0x64,&nbsp;0xA4,&nbsp;0x6C,&nbsp;0xAC,&nbsp;0xAD,&nbsp;0x6D,&nbsp;0xAF,&nbsp;0x6F,<br />0x6E,&nbsp;0xAE,&nbsp;0xAA,&nbsp;0x6A,&nbsp;0x6B,&nbsp;0xAB,&nbsp;0x69,&nbsp;0xA9,&nbsp;0xA8,&nbsp;0x68,<br />0x78,&nbsp;0xB8,&nbsp;0xB9,&nbsp;0x79,&nbsp;0xBB,&nbsp;0x7B,&nbsp;0x7A,&nbsp;0xBA,&nbsp;0xBE,&nbsp;0x7E,<br />0x7F,&nbsp;0xBF,&nbsp;0x7D,&nbsp;0xBD,&nbsp;0xBC,&nbsp;0x7C,&nbsp;0xB4,&nbsp;0x74,&nbsp;0x75,&nbsp;0xB5,<br />0x77,&nbsp;0xB7,&nbsp;0xB6,&nbsp;0x76,&nbsp;0x72,&nbsp;0xB2,&nbsp;0xB3,&nbsp;0x73,&nbsp;0xB1,&nbsp;0x71,<br />0x70,&nbsp;0xB0,&nbsp;0x50,&nbsp;0x90,&nbsp;0x91,&nbsp;0x51,&nbsp;0x93,&nbsp;0x53,&nbsp;0x52,&nbsp;0x92,<br />0x96,&nbsp;0x56,&nbsp;0x57,&nbsp;0x97,&nbsp;0x55,&nbsp;0x95,&nbsp;0x94,&nbsp;0x54,&nbsp;0x9C,&nbsp;0x5C,<br />0x5D,&nbsp;0x9D,&nbsp;0x5F,&nbsp;0x9F,&nbsp;0x9E,&nbsp;0x5E,&nbsp;0x5A,&nbsp;0x9A,&nbsp;0x9B,&nbsp;0x5B,<br />0x99,&nbsp;0x59,&nbsp;0x58,&nbsp;0x98,&nbsp;0x88,&nbsp;0x48,&nbsp;0x49,&nbsp;0x89,&nbsp;0x4B,&nbsp;0x8B,<br />0x8A,&nbsp;0x4A,&nbsp;0x4E,&nbsp;0x8E,&nbsp;0x8F,&nbsp;0x4F,&nbsp;0x8D,&nbsp;0x4D,&nbsp;0x4C,&nbsp;0x8C,<br />0x44,&nbsp;0x84,&nbsp;0x85,&nbsp;0x45,&nbsp;0x87,&nbsp;0x47,&nbsp;0x46,&nbsp;0x86,&nbsp;0x82,&nbsp;0x42,<br />0x43,&nbsp;0x83,&nbsp;0x41,&nbsp;0x81,&nbsp;0x80,&nbsp;0x40<br />}&nbsp;;<br /><br />unsigned&nbsp;char&nbsp;nLRC(unsigned&nbsp;char&nbsp;*str,unsigned&nbsp;int&nbsp;len)<br />{<br />unsigned&nbsp;int&nbsp;tmp;<br /><br />for(tmp=0;tmp&ltlen;tmp&nbsp;)<br />str[tmp]=str[tmp]-0x30;<br />return(LRC(str,len));<br />}<br /><br />unsigned&nbsp;char&nbsp;LRC(unsigned&nbsp;char&nbsp;*uchMsg,&nbsp;unsigned&nbsp;int&nbsp;usDataLen)<br />{<br />unsigned&nbsp;char&nbsp;uchLRC&nbsp;=&nbsp;0&nbsp;;&nbsp;/*&nbsp;LRC&nbsp;char&nbsp;initialized&nbsp;*/<br /><br />while&nbsp;(usDataLen--)&nbsp;/*&nbsp;pass&nbsp;through&nbsp;message&nbsp;*/<br />uchLRC&nbsp;=*uchMsg&nbsp;;&nbsp;/*&nbsp;buffer&nbsp;add&nbsp;buffer&nbsp;byte*/<br />/*&nbsp;without&nbsp;carry&nbsp;*/<br /><br />return((unsigned&nbsp;char)(-(char)(uchLRC)));<br />/*&nbsp;return&nbsp;twos&nbsp;complemen&nbsp;*/<br />}<br /><br />unsigned&nbsp;int&nbsp;nCRC16(unsigned&nbsp;char&nbsp;*puchMsg,&nbsp;unsigned&nbsp;int&nbsp;usDataLen)<br />{<br />unsigned&nbsp;char&nbsp;uchCRCHi&nbsp;=&nbsp;0xFF&nbsp;;&nbsp;/*&nbsp;high&nbsp;CRC&nbsp;unsigned&nbsp;char&nbsp;initialized&nbsp;*/<br />unsigned&nbsp;char&nbsp;uchCRCLo&nbsp;=&nbsp;0xFF&nbsp;;&nbsp;/*&nbsp;low&nbsp;CRC&nbsp;unsigned&nbsp;char&nbsp;initialized&nbsp;*/<br />unsigned&nbsp;int&nbsp;uIndex&nbsp;;&nbsp;/*&nbsp;will&nbsp;index&nbsp;into&nbsp;CRC&nbsp;lookup*/<br />/*&nbsp;table*/<br />while&nbsp;(usDataLen--)&nbsp;/*&nbsp;pass&nbsp;through&nbsp;message&nbsp;buffer&nbsp;*/<br />{<br />uIndex&nbsp;=&nbsp;uchCRCHi&nbsp;^&nbsp;*puchMsg&nbsp;;&nbsp;/*&nbsp;calculate&nbsp;the&nbsp;CRC&nbsp;*/<br />uchCRCHi&nbsp;=&nbsp;uchCRCLo&nbsp;^&nbsp;auchCRCHi[uIndex];<br />uchCRCLo&nbsp;=&nbsp;auchCRCLo[uIndex]&nbsp;;<br />}<br /><br />return&nbsp;((uchCRCHi&lt&lt8)|uchCRCLo)&nbsp;;<br />}
回复

收藏 举报

 楼主| paul1983 发表于 2008-12-17 23:05 | 显示全部楼层

crc 16

<br />#define&nbsp;POLY_CRC16&nbsp;0xA001<br /><br />static&nbsp;BYTE&nbsp;TABLE1[256];&nbsp;/*&nbsp;crc16&nbsp;values&nbsp;*/<br />static&nbsp;BYTE&nbsp;TABLE2[256];&nbsp;/*&nbsp;crc16&nbsp;values&nbsp;*/<br /><br />/*<br />crc_init:&nbsp;prepare&nbsp;crc16&nbsp;preset&nbsp;tables<br />must&nbsp;be&nbsp;called&nbsp;once&nbsp;at&nbsp;init<br />(before&nbsp;any&nbsp;crc&nbsp;calculation)<br />*/<br /><br />void&nbsp;crc_init&nbsp;(void)<br />{<br />WORD&nbsp;mask,&nbsp;bit,&nbsp;crc,&nbsp;mem;<br /><br />for(&nbsp;mask&nbsp;=&nbsp;0;&nbsp;mask&nbsp;&lt&nbsp;0x100;&nbsp;mask&nbsp;)&nbsp;{<br />crc&nbsp;=&nbsp;mask;<br />for(&nbsp;bit&nbsp;=&nbsp;0;&nbsp;bit&nbsp;&lt&nbsp;8;&nbsp;bit&nbsp;)&nbsp;{<br />mem&nbsp;=&nbsp;crc&nbsp;&&nbsp;0x0001&nbsp;;<br />crc&nbsp;/=&nbsp;2;<br />if&nbsp;(&nbsp;mem&nbsp;!=&nbsp;0&nbsp;)&nbsp;crc&nbsp;^=&nbsp;POLY_CRC16&nbsp;;<br />}<br />TABLE2[mask]&nbsp;=&nbsp;crc&nbsp;&&nbsp;0xff;<br />TABLE1[mask]&nbsp;=&nbsp;crc&nbsp;&gt&gt&nbsp;8;<br />}<br />}<br /><br />/*<br />crc_make:&nbsp;calculates&nbsp;a&nbsp;crc16<br />size:&nbsp;size&nbsp;of&nbsp;the&nbsp;frame&nbsp;(including&nbsp;header)<br />buff:&nbsp;pointer&nbsp;to&nbsp;the&nbsp;first&nbsp;byte&nbsp;of&nbsp;the&nbsp;frame<br />(slave&nbsp;number)<br />return:&nbsp;CRC16&nbsp;in&nbsp;MOTOROLA&nbsp;format&nbsp;(high&nbsp;byte&nbsp;/&nbsp;low&nbsp;byte)<br />*/<br /><br />WORD&nbsp;crc_make&nbsp;(WORD&nbsp;size,&nbsp;BYTE&nbsp;*buff)<br />{<br />BYTE&nbsp;car,&nbsp;i;<br />BYTE&nbsp;crc[2];<br /><br />crc[0]&nbsp;=&nbsp;0xff;<br />crc[1]&nbsp;=&nbsp;0xff;<br />for&nbsp;(&nbsp;i&nbsp;=&nbsp;0;&nbsp;i&nbsp;&lt&nbsp;size;&nbsp;i&nbsp;)&nbsp;{<br />car&nbsp;=&nbsp;buff;<br />car&nbsp;^=&nbsp;crc[0];<br />crc[0]&nbsp;=&nbsp;crc[1]&nbsp;^&nbsp;TABLE2[car];<br />crc[1]&nbsp;=&nbsp;TABLE1[car];<br />}<br />return&nbsp;(*(WORD*)(&crc[0]));<br />}
回复

收藏 举报

 楼主| paul1983 发表于 2008-12-17 23:06 | 显示全部楼层

crc16 keil c51

<br />#pragma&nbsp;small<br />#include&nbsp;&ltreg52.h&gt<br />unsigned&nbsp;int&nbsp;CRC_16(unsigned&nbsp;int&nbsp;c,unsigned&nbsp;char&nbsp;d);<br />unsigned&nbsp;int&nbsp;crc16=0;<br /><br />void&nbsp;main(void)<br />{<br />//&nbsp;unsigned&nbsp;char&nbsp;crcbuff[]&nbsp;=&nbsp;{31,3,0,1,0,7};<br />unsigned&nbsp;char&nbsp;crcbuff[]&nbsp;=&nbsp;&quot;123456789&quot;;<br />unsigned&nbsp;char&nbsp;*p;<br />//&nbsp;unsigned&nbsp;int&nbsp;crc16&nbsp;=&nbsp;0xffff;<br />p=crcbuff;<br />while(*p&nbsp;!='\0')<br />{<br />crc16&nbsp;=&nbsp;CRC_16(crc16,*p&nbsp;);<br />}<br />p=crcbuff;<br />}<br /><br />unsigned&nbsp;int&nbsp;CRC_16(unsigned&nbsp;int&nbsp;c,unsigned&nbsp;char&nbsp;d)<br />{<br />unsigned&nbsp;int&nbsp;data&nbsp;e;<br />unsigned&nbsp;char&nbsp;data&nbsp;f;<br />e&nbsp;=&nbsp;c^(unsigned&nbsp;int)d;<br />for(f=0;f&lt8;f&nbsp;)<br />{<br />if(e&1)<br />{<br />e&nbsp;&gt&gt=&nbsp;1;<br />e&nbsp;^=&nbsp;0xa001;<br />}<br />else&nbsp;e&nbsp;&gt&gt=&nbsp;1;<br />}<br />return&nbsp;e;<br />}<br />//&nbsp;使用字符串&quot;123456789&quot;测试,crc16初始值为0时<br />//&nbsp;结果为0xbb3d&nbsp;符合crc&nbsp;caculator
回复

收藏 举报

 楼主| paul1983 发表于 2008-12-17 23:07 | 显示全部楼层

查表算法

unsigned&nbsp;int&nbsp;crc_ta[16]={&nbsp;<br />0x0000,0x1021,0x2042,0x3063,0x4084,0x50a5,0x60c6,0x70e7,<br />0x8108,0x9129,0xa14a,0xb16b,0xc18c,0xd1ad,0xe1ce,0xf1ef,<br />};<br /><br />unsigned&nbsp;int&nbsp;Crc16(unsigned&nbsp;char&nbsp;*ptr,&nbsp;unsigned&nbsp;char&nbsp;len)&nbsp;<br />{<br />unsigned&nbsp;int&nbsp;crc;<br />unsigned&nbsp;char&nbsp;da;<br /><br />crc=0;<br />while(len--!=0)<br />&nbsp;{<br />&nbsp;&nbsp;&nbsp;da=crc&gt&gt12;&nbsp;<br />&nbsp;&nbsp;&nbsp;crc&lt&lt=4;&nbsp;<br />&nbsp;&nbsp;&nbsp;crc^=crc_ta[da^(*ptr/16)];&nbsp;<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br />&nbsp;&nbsp;&nbsp;da=crc&gt&gt12;&nbsp;<br />&nbsp;&nbsp;&nbsp;crc&lt&lt=4;&nbsp;<br />&nbsp;&nbsp;&nbsp;crc^=crc_ta[da^(*ptr&0x0f)];&nbsp;<br />&nbsp;&nbsp;&nbsp;ptr++;<br />}<br />return(crc);<br />}&nbsp;
回复

收藏 举报

hotpower 发表于 2008-12-17 23:31 | 显示全部楼层

网上群魔乱舞CRC/PEC在线验算器

  
回复

收藏 举报

洪七公 发表于 2008-12-20 21:34 | 显示全部楼层

PIC CRC8

;-------8位右移循环冗余码校验------------------<br />;<br />;例如:<br />;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CLRF&nbsp;&nbsp;&nbsp;&nbsp;CRCOUT<br />;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CALL&nbsp;&nbsp;&nbsp;&nbsp;CRCFRB<br />CALL_CRCFRB&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;MACRO&nbsp;CRCOUT,COUNT,VALUE,TEMP<br />CRCFRB<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;MACRO_CRCFRB&nbsp;CRCOUT,COUNT,VALUE,TEMP<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;RETLW&nbsp;&nbsp;&nbsp;0<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ENDM<br />;----------------------------------------------<br />MACRO_CRCFRB&nbsp;&nbsp;&nbsp;&nbsp;MACRO&nbsp;CRCOUT,COUNT,VALUE,TEMP<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;LOCAL&nbsp;&nbsp;&nbsp;CRCFRBLOOP,CRCFRBNEXT<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;MOVWF&nbsp;&nbsp;&nbsp;VALUE<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;MOVLFB&nbsp;.8,COUNT<br />CRCFRBLOOP<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;MOVF&nbsp;&nbsp;&nbsp;&nbsp;VALUE,W<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;XORWF&nbsp;&nbsp;&nbsp;CRCOUT,W;异或CRC<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;MOVWF&nbsp;&nbsp;&nbsp;TEMP;暂存<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;RRF&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;TEMP,W;CY<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;MOVF&nbsp;&nbsp;&nbsp;&nbsp;VALUE,W<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;BTFSS&nbsp;&nbsp;&nbsp;STATUS,C<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;GOTO&nbsp;&nbsp;&nbsp;&nbsp;CRCFRBNEXT<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;MOVLW&nbsp;&nbsp;&nbsp;18H;异或x5+x2<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;XORWF&nbsp;&nbsp;&nbsp;CRCOUT,F<br />CRCFRBNEXT<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;RRF&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CRCOUT,F<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;BCF&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;STATUS,C<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;BTFSC&nbsp;&nbsp;&nbsp;VALUE,0<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;BSF&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;STATUS,C<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;RRF&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;VALUE,F<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;DECFSZ&nbsp;&nbsp;COUNT,F<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;GOTO&nbsp;&nbsp;&nbsp;&nbsp;CRCFRBLOOP<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ENDM
回复

收藏 举报

hotpower 发表于 2018-12-30 00:57 来自手机 | 显示全部楼层
http://www.hotpage.com.cn/hotcrc
回复

收藏 举报

返回列表 发新帖
高级模式
B Color Image Link Quote Code Smilies
您需要登录后才可以回帖 登录 | 注册

本版积分规则

paul1983

3

主题

29

帖子

0

粉丝
快速回复 在线客服 返回列表 返回顶部