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| Both sides previous revisionPrevious revisionNext revision | Previous revisionNext revisionBoth sides next revision | ||
| sdk:gps-udp-client-gnsstogps [2019/07/09 13:49] – fachet | sdk:gps-udp-client-gnsstogps [2019/11/28 11:10] – fachet | ||
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| Line 1: | Line 1: | ||
| + | ====== Background ====== | ||
| + | GPS was the first Global Navigation Satellite System (GNSS) and the termt GPS is often used as a synonym for GNSS. | ||
| + | |||
| + | Because of this older software only check for NMEA 0183 sentences starting with < | ||
| + | Unfortunately with newer GNSS receiver often multiple GNSS systems are used and therefore < | ||
| + | It would be better to us instead of < | ||
| + | |||
| + | < | ||
| + | " | ||
| + | BD = Beidu | ||
| + | GA = Galileo | ||
| + | GL = GLONASS | ||
| + | GP = GPS | ||
| + | GN = GNSS(multiple sources e.g. GPS " | ||
| + | " | ||
| + | RMC = Recommended Minimum Sentence C | ||
| + | GGA = Global Positioning System Fix Data | ||
| + | GNS = GNSS fixed data | ||
| + | GLL = Geographic Position - Latitude/ | ||
| + | |||
| ====== SDK Script gps-udp-client-GNSStoGPS.are ====== | ====== SDK Script gps-udp-client-GNSStoGPS.are ====== | ||
| <code c gps-udp-client-gnsstogps.are> | <code c gps-udp-client-gnsstogps.are> | ||
| Line 70: | Line 90: | ||
| chars = explode(s); | chars = explode(s); | ||
| for (i = 1; i < pos; i++) { /* skip $ and *XX */ | for (i = 1; i < pos; i++) { /* skip $ and *XX */ | ||
| - | | + | c = ord(chars[i]); |
| - | | + | |
| cs ^= c; | cs ^= c; | ||
| } | } | ||
| Line 144: | Line 163: | ||
| a_arr = explode(data); | a_arr = explode(data); | ||
| a_arr[2] = " | a_arr[2] = " | ||
| - | data = implode(a_arr); | + | data = checksum(implode(a_arr)); |
| } | } | ||
| /* skip all messages different from GPGGA | /* skip all messages different from GPGGA | ||