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HDC3020: CRC C++ Calculation

John Churchill
Prodigy 250 points
Part Number: HDC3020

I have tried a few different C++ CRC-8 examples on the web to recreate the CRC example given in the HDC3020 data sheet and am unable to replicate the value. I am writing the routine on a TMS 320F2837xS processor in C++. If anyone has an example it would be greatly appreciated!

  • 0
    TI__Expert 3270 points

    Hi John,

    Please see the below code to implement the CRC algorithm for this device:

    #include <stdio.h>
void main (int argc, char* argv[]) {
 	unsigned char crc = 0xFF;
 	unsigned int msg[20];
 	int msglen = (argc > 1) ? (argc - 1): 2;
 	msg[0] = 0xAB;
 	msg[1] = 0xCD;
 	for (int i = 1; i < argc; i++) {
 		sscanf(argv[i], "%X", &msg[i - 1]); //Enter the MSB and the LSB hex values
 	}
 	for (int byte = 0; byte < msglen; byte++) {
 		crc ^= msg[byte];
 		for (int bit = 0; bit < 8; bit++) {
 			if (crc & 0x80)
 				crc = (crc << 1) ^ 0x31;
 			else
 				crc = (crc << 1);
 		}
 	}
 	printf ("crc: 0x%X\n", crc);
}

    Regards,
    Pavani Tenneti