113 	uint8_t checksum = 0;  in gnss_nmea0183_checksum()  local
120 		checksum = checksum ^ str[i];  in gnss_nmea0183_checksum()
123 	return checksum;  in gnss_nmea0183_checksum()
129 	uint8_t checksum;  in gnss_nmea0183_snprintk()  local
156 	checksum = gnss_nmea0183_checksum(&str[1]);  in gnss_nmea0183_snprintk()
157 	pos = snprintk(&str[pos], size - pos, "*%02X", checksum);  in gnss_nmea0183_snprintk()
250 	uint8_t checksum = 0;  in gnss_nmea0183_validate_message()  local
255 	/* Message must contain message id and checksum */  in gnss_nmea0183_validate_message()
260 	/* First argument should start with '$' which is not covered by checksum */  in gnss_nmea0183_validate_message()
267 		checksum ^= argv[0][u];  in gnss_nmea0183_validate_message()
269 	checksum ^= ',';  in gnss_nmea0183_validate_message()
271 	/* Cover all except last argument which contains the checksum*/  in gnss_nmea0183_validate_message()
275 			checksum ^= argv[i][u];  in gnss_nmea0183_validate_message()
277 		checksum ^= ',';  in gnss_nmea0183_validate_message()
286 	return checksum == (uint8_t)tmp;  in gnss_nmea0183_validate_message()