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to calculate 8-bit checksum for a hexadecimal
Look at this :
{
char buffer[82],buff2[6];
uint8 i,crc,s;
snprintf(buffer,sizeof(buffer),
"$GPGGA," //MESSAGE ID
"%09.2f," //UTCTIME
"%09.5f," //LATITUDE
"%c," //N/S Indicator
"%011.5f,"...
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