CRC8

CRC8.m

//
//  CRC8.m
//
//  Created by Chris Desch on 2/6/12.
//  Translation from http://avrhelp.mcselec.com/index.html?crc8.htm

- (int)crc8Checksum:(NSString*)dataFrame{
    
    char j;
    int crc8 = 0;
    int x = 0;
       
    for (int i = 0; i < [dataFrame length]; i++){
        x = [dataFrame characterAtIndex:i]; 
        
        for (int k = 0; k < 8; k++){
            j = 1 & (x ^ crc8);
            crc8 = floor0(crc8 / 2) & 0xFF;
            x = floor0(x / 2) & 0xFF;
            if (j != 0 ){
                crc8 = crc8 ^ 0x8C;
            }
        }
    }
    return crc8;
}