标题: CRC???é?÷??ר?ù-2 AVR?????úCRC???é?????é±í???±???ú??
  本主题由 admin 于 2006-5-5 23:49 移动 
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发表于 2004-5-21 17:28  资料  个人空间  短消息  加为好友 
CRC???é?÷??ר?ù-2 AVR?????úCRC???é?????é±í???±???ú??

AVR?????úCRC???é?????é±í???±???ú??  
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?±????2003?ê11??20??1:26

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   ?????????·???à?????éCRC???????????????é·?·¨??????AVR???????????????ú???????ó????????????????????·??????????ó??????±????ù??Atmega128???????????????ú??????32??CRC???é?????±???ú??·¨???é±í?ú??·¨???ù?????é?á????·???????·?·¨????????

   ???ü????Atmega128 CRC???é?? CRC?ú??±í ??????

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????AVR???????????????ú??8??RISC MCU???????ó?à?????????è?????±?????????????ì?¨8MHz AVR????????????????200MHz 80C51??????????????32???¨???????÷?±????ALU?à?????????????????±?????????????????ò×???±à????Flash??EPPROM??????·±?à???????à????????????

????±???????Atmel??????Atmega128???????????????ú??????IEEE 1999?ê??????802.11???????ò?????é±ê×???????32?????·???à???é???¨Cyclic Redundancy Check???????????????????±?????í???é??



[???ù±?zona??2004-05-21 10:56 PM????±à??]





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zona
超级版主
Rank: 8Rank: 8


UID 3
精华 0
积分 503
帖子 532
阅读权限 101
注册 2003-12-16
状态 离线
发表于 2004-5-21 17:30  资料  个人空间  短消息  加为好友 
1 CRC???·???à???é?????í

   1.1 ????????????????

?????ù??IEEE???¨??802.11???????ò???????é?????????????±????°??????????????????????????????????í???????????¨???????????????·?????????????á?????ü??????????????×???×é???¨???????ò×?×ó????????

?? ?· ??  ?? ??  ?? CRC???é??

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CRC???é???????ù???°??????×????ú????CRC???é????

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zona
超级版主
Rank: 8Rank: 8


UID 3
精华 0
积分 503
帖子 532
阅读权限 101
注册 2003-12-16
状态 离线
发表于 2004-5-21 22:32  资料  个人空间  短消息  加为好友 
1.2 CRC???é?????í???ú??·?·¨

????CRC???é?????à????±à??·?·¨??±????í???????é??????×÷??????n?×?????????à???????????????¨??·???????????????????g(x)???ú???à?????? m(x)????????CRC???é????c(x)??

????CRC???é????±à??·?·¨??????·???????????????g(x)?????ú???à????m(x)????×??ó???à??×÷??CRC???é???????????è??????

???? ?? ?è??·??????????é??m???????????à???? g(x)???ú???à??????r?×??m(x)?????????é???????í??r??0???????é???¤????????m+r?????????????????à??????G(x) ??

?????? ???ú???à????m(x)????G(x) ???ó???à?????×????r-1?????????à????c(x)???????????à???? c(x)????g(x)?????ú???à????m(x)±à????CRC???é????

?????? ????2??·???????c(x)???????????????à????????°ü????CRC???é??????·???×?·?????

CRC???é????100%???ì?????ù???????????ú?í?ó???¤??????????r?¨r??m(x)???×????????·??í?ó???ù????CRC???ú???à???????×?????????ó????????????????CCITT?¨?é??2048 Kb/s??PCM?ù???è±?????CRC-4·?°?????????CRC???é???ú???à????m(x)=x4+x+1 ??????16??CRC???é??????±??¤?? 1014bit????????????1????±??ì???????í?ó ????IBM?????????????·????????SDLC???????é?ò??FCS????????CRC-16?????ú???à????m(x)=x16+x15+x2+1??????CCITT?????????????????·????????HDLC???????é?ò??FCS????????CCITT-16?????ú???à????m(x)= x16+x15+x5+1??CRC-32???ú???à????m(x)=x32+x26+x23+x22+x16+x12+x11+x10+x8+x7+x5+x4+x2+x+1??CRC-32???í????????CRC-16??10-5??????CRC-32??????????°?CRC-32??????????????????·????????ù?????¨?????????ú???ì?ò??????·???·?????????UART?¨???????????¨??MC6582??Intel8273??Z80-SIO??????????????CRC???é?????????í?????????????¨??????MPEG??????????????????CRC-32???????í??????

????m(x) ?ú???à????????????0?ò1??????m(x) ???×????????1????????????±?????1??m(x) ???????????????ì?í??????????




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zona
超级版主
Rank: 8Rank: 8


UID 3
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积分 503
帖子 532
阅读权限 101
注册 2003-12-16
状态 离线
发表于 2004-5-21 22:33  资料  个人空间  短消息  加为好友 
2 ????Atmega128?ú??32??CRC???é??

   2.1 ?±??????·¨?ú??32??CRC???é??

?????±??????·¨????????CRC???é?????ú?ú???í???è?????ò?????????????é?ú???????????é??????????????????????·¨?ò???????×?????????????¤???ú???à????m(x) ??????????·????????????¤???é??????????????????????·??????????é???¤??????·?·¨???????????????ò???ü1?????????í1?????????§???????????????ó??

????????·¨?ú??32??CRC???é?????÷??????1?ù????

??????AVR?????ú??±à????????CRC-32?????ò??±???????????°??¨http://www.dpj.com.cn????

   2.2 ?é±í·¨?ú??32??CRC???é??

???????±??????·¨?à·????é±í·¨?ú??32??CRC???é?????????????????????????ì???±????????????????????????·¨?×?????ó????32??CRC?ú??±í??????1??×?????8?????ù??????±í×?????256??????????????AVR???????????????ú?????????÷????1??×??????????????ù????±à??????????????CRC?ú??±í×?????1024????·?±???0~1023????4??????1??32??CRC?ú??±í????????????????????????????????????32??CRC?ú??±í?????ò?ê??±???????????°??¨http://www.dpj.com.cn????

?????é±í·¨?ú??32??CRC???é?????÷??????2?ù????

??????2?ù?????÷???????????¨???ì?ò????????CRC?ú??±í???÷???±??????AVR???????????????ú?????????÷????1??×??????????????ù????±à???????????ù???ù???ó?ú????CRC???é?????????????à???????????????????????????±???ó32??CRC???é????????°??ù???????÷????????????4?????ó??????????????????32??CRC?ú??±í??????????????

?????????é±í·¨????32??CRC???é?????????ò?ê??±???????????°??¨http://www.dpj.com.cn????

3 ???é?á??

????????±????ù??????32??CRC???é???ú??·?·¨????????·?±?????????×?????????????????????·?·¨???????é???????§??????±???????±í1?ù????




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???í?ì?????????????á°ò±?????
顶部
zona
超级版主
Rank: 8Rank: 8


UID 3
精华 0
积分 503
帖子 532
阅读权限 101
注册 2003-12-16
状态 离线
发表于 2004-5-21 22:36  资料  个人空间  短消息  加为好友 
±í????



 附件: 您所在的用户组无法下载或查看附件




???í?ì?????????????á°ò±?????
顶部
zona
超级版主
Rank: 8Rank: 8


UID 3
精华 0
积分 503
帖子 532
阅读权限 101
注册 2003-12-16
状态 离线
发表于 2004-5-21 22:36  资料  个人空间  短消息  加为好友 
???????ù?????é?á???ù????AVR Studio4·????í????????Atmel??????Atmega128???????????????ú?????é?è±????¨????12MHz???????????????ù????

???????÷??32??CRC?ú??±í???ò??????32??CRC?ú??±í?±?????±3968.33??s????????47620???±?????????????????é?á?????????????????á????

?????? ???????????ú??32??CRC?ú??±í???±?????????±??°?32??CRC?ú??±í??????Atmega128????±à???????????÷Flash??????±í1???????????????é±í·¨??????????±??±??????·¨???ì???à???ò???????à???é???????????????????????ó?ú??32??CRC???é???±???????????é±í·¨??

?????? ?????????????????????????????÷???????ó???????????????¨?????????±????????±????????ó?±???????????±??????·¨????±????é±í·¨??CRC?ú??±í???????÷????????????

?????? ???????é?á????32??CRC???é??????????·¨????????±????????ù???????á??????????8????16????24??CRC???é????

?á ??

????CRC???·???à???é????????·?±??????§???ì???????é·?·¨??±???·????????í?à?????¤???????????ù??????????·¨?????é±í·¨???±??????·¨????????????CRC???é?????????ü???÷???????????¤?????????????ù???????è??????×???????·?·¨????????×??????§????





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