NmeaParser

This project demonstrate how to parser NMEA protocol.

How to use

1. Include "nmeaparser.h" in your source file.
2. Create a nmeaparser: struct nmea_parser parser[1];.
3. Init the parser with nmea_parser_init(parser);.
4. Create your navigation report function: void my_reporter(struct nav_data *navdata){...}.
5. Setup parser's report funtion: parser->report_nav_status = my_reporter;.
6. When read data from serialport or file, add thee data character by character to the parser with nmea_parser_putchar(parser, c).
7. When navigation data is ready, parser will trigger my_reporter function to report navigation status.

Modules

Module	Files	Description
nmea_reader	nmeardr.h nmeardr.c	Read NMEA data, contains one NMEA sentence.
nmea_tokenizer	nmeatknzr.h nmeatknzr.c	Split NMEA sentence into tokens.
parser	nmeaparser.h nmeaparser.c	Parse nmea from tokens.
nav_data	navdata.h navdata.c	Navigation data.

1. Add NMEA data to nmea_reader by character.
2. If encounter '\n', using nmea_tokenizer split nmea_reader.
3. Parse nmea_tokenizer , and store results int nav_data.
4. If encounter GGA sentence, print nav_data.

Navigation data

Date and Time

Date and time are in UTC.

Latitude

In degrees.

Positive for North, and negative for South.

Longitude

In degrees.

Positive for East, and negative for West.

Satellite's PRN and SVID

PRN is the satellite's NO. in NMEA.

SVID is the index in satellite's array.

SVID range	Constellation type
1-64	GPS
65-96	GLONASS
201-264	Beidou