编译器是PICC
程序有点大,分模块写的,编译时CRC校验定义的表格有问题,帖一下相关的:
/**************** CRC.h **************************/
#ifdef CRC_GLOBALS
#define CRC_EXT
#else
#define CRC_EXT extern
#endif
CRC_EXT const uchar CRCHi[256]={....}; //数据省略
CRC_EXT const uchar CRCLo[256]={....};
CRC_EXT uint CRC16(bank2 uchar *puchMsg, uchar usDataLen );
/******************************************************/
/******************** CRC.c ***************************/
/****************就是个CRC校验的函数没什么说的*********/
#define CRC_GLOBALS
#include"includes.h" //这个文件已经包含了CRC.h
uint CRC16(bank2 uchar *puchMsg, uchar usDataLen ) /* The function returns the CRC as a unsigned short type */
{
uchar uchCRCHi=0xFF; /* high byte of CRC initialized */
uchar uchCRCLo=0xFF; /* low byte of CRC initialized */
uint uIndex; /* will index into CRC lookup table */
const uchar *PHi;
const uchar *PLo;
PHi=CRCHi;
PLo=CRCLo;
while(usDataLen--) /* pass through message buffer */
{
uIndex=uchCRCLo^(*puchMsg++); /* calculate the CRC */
//uchCRCLo=uchCRCHi^CRCHi[uIndex];
uchCRCLo=uchCRCHi^(*(PHi+uIndex));
//uchCRCHi=CRCLo[uIndex];
uchCRCHi=*(PLo+uIndex);
}
return (uchCRCHi<<8|uchCRCLo);
}
/**************************************************************/
我在另外两个.C模块中调用上面CRC校验函数
/********************* RTU.c *********************************/
#define RTU_GLOBALS
#include"includes.h"
....
void RTUReceive(void)
{
....
CRCTmp1=CRC16(ptr1, DataLen1 );
....
}
....
/******************************************************************/
/************************* RTUSlave.c **************************/
#define RTUSlave_GLOBALS
#include"includes.h"
...
void RepuCheck(void)
{
....
CRCTmp2=CRC16(ptr2, DataLen2 );
....
}
...
/*******************************************************************/
就在这两个地方用了,因为我原来在51单片机上写没什么问题的,可是在pic上编译有问题,我用pic16f877a :
Error [482] ; . symbol "_CRCHi" is defined more than once in "ApplMain.obj"
Error [482] ; . symbol "_CRCLo" is defined more than once in "ApplMain.obj"
Error [482] ; . symbol "_CRCHi" is defined more than once in "ApplMain.obj"
Error [482] ; . symbol "_CRCLo" is defined more than once in "ApplMain.obj"
Error [482] ; . symbol "_CRCHi" is defined more than once in "ApplMain.obj"
Error [482] ; . symbol "_CRCLo" is defined more than once in "ApplMain.obj"
Error [482] ; . symbol "_CRCHi" is defined more than once in "ApplMain.obj"
Error [482] ; . symbol "_CRCLo" is defined more than once in "ApplMain.obj"
Error [482] ; . symbol "_CRCHi" is defined more than once in "ApplMain.obj"
Error [482] ; . symbol "_CRCLo" is defined more than once in "ApplMain.obj"
Error [482] ; . symbol "_CRCHi" is defined more than once in "ApplMain.obj"
Error [482] ; . symbol "_CRCLo" is defined more than once in "ApplMain.obj"
...
我实在想不出那里把它重定义了,好象语法没错误(提示是"_CRCHi"不是"CRCHi")
谢谢各位了,第一用pic |
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