#include<p24fxxxx.h>
unsigned int Result;
unsigned char datab[]={
0x01,0x02,0x03,0x04,
0x05,0x06,0x07,0x08,
0x09,0x0A,0x0B,0x0C,
0x0D,0x0E,0x0F,0x10,
0x11,0x12,0x13,0x14,
0x15
};
unsigned int CRC_HW_calculateB(unsigned char *,unsigned int);
main()
{
Nop();
Result2=CRC_HW_calculateB(datab,sizeof(datab));
Nop();
Nop();
while(1);
}
unsigned int CRC_HW_calculateB(unsigned char *temp,unsigned int Len)
{
unsigned int Carry,j;
unsigned char *ptr,Flag;
ptr=(unsigned char *)&CRCDAT;
CRCCON = 0x0000F; // ="Length of polynomial-1"
CRCXOR = 0x1021; // generator Polynomial
CRCWDAT= 0x0000; // Initialize CRCWDAT with 0
Flag=0x00;
for(j=0;j<Len;j++)
{
*ptr =*temp++; //write data into FIFO
Flag=Flag^0x01;//Flag for odd or even bytes
if(CRCCONbits.CRCFUL==1)//check if FIFO is full
{
CRCCONbits.CRCGO=1; //start CRC engine
while(CRCCONbits.CRCMPT!=1);//check if FIFO is empty
CRCCONbits.CRCGO=0; //stop CRC engine
}
}
if(CRCCONbits.CRCGO!=1)
CRCCONbits.CRCGO=1;
if(Flag==0)
CRCDAT = 0x0000; //appending PLEN+1 zeros (multiply by 2^16)
else
*ptr=0x00;//appending (PLEN+1)/2 zeros (multiply by 2^8)
while(CRCCONbits.CRCMPT!=1);//check if FIFO is empty
Nop();
Nop();
Nop();
Nop();
Nop();
CRCCONbits.CRCGO=0; //stop CRC engine
Nop();
if(Flag==1) // if odd number of bytes,
{ //append (PLEN+1)/2 zeros (multiply by 2^8)
for(j = 0; j < 8; j ++)
{
Carry =( CRCWDAT & 0x8000);
CRCWDAT <<= 1;
if(Carry)
CRCWDAT ^= 0x1021;
}
}
return CRCWDAT;
}
我用的就是官方提供的程序！ 我找了珠海 深圳 上海的FAE 答复均是硬件肯定没问题，让他们再调试调试，这都两个星期了，给香港北京的技术支持！到现在也没解决，各位不相信的话自己可以去尝试！ |
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