about CRC

Rabbit
1

Hi, i have to calculate the CRC of a string like:
“05 FF 65”
the CRC is “E5 CB”

how can i do in Dynamic C? On a rabbit 3700?
There is the function getcrc, how to use it?

Thanks
(I’m not so good in this language)
Alex

2

Hi,

The problem with CRC’s is that there are many different type, and they may have different seed values, so your question would need to be more specific

3 

int get_crc(char TXDATA[], int TXLEN){
   auto int i;
   auto	int j;
   unsigned int CRC;
   CRC = 0xFFFF;
   for (i = 0 ; i < TXLEN; i++){
       CRC ^= TXDATA[i];
       for (j= 0; j < 8 ; j++){
        		if (CRC & 0x0001)
        		CRC = (CRC >> 1) ^ 0x8408;
       else
        		CRC = (CRC >> 1);
       }

    }
    return CRC;
}