A basic library for the Adafruit Ultimate GPS module. (MTK3339) http://www.adafruit.com/products/746
Fork of GPS by
Diff: GPS.cpp
- Revision:
- 1:0a034c2dbea6
- Parent:
- 0:697a7215cc10
- Child:
- 2:dcc14e81f8be
diff -r 697a7215cc10 -r 0a034c2dbea6 GPS.cpp --- a/GPS.cpp Sat Oct 06 22:41:59 2012 +0000 +++ b/GPS.cpp Tue Oct 09 18:47:58 2012 +0000 @@ -1,73 +1,67 @@ -#include "GPS.h" - -GPS::GPS(PinName tx, PinName rx) : _UltimateGps(tx, rx) -{ - _UltimateGps.baud(9600); -} - -int GPS::parseData() -{ - - while(1) { - getData(); - if(sscanf(NEMA, "GPGGA, %*f, %*f, %*c, %*f, %*c, %d, %d, %*f, %f", &fixtype, &satellites, &altitude) >=1); - if(sscanf(NEMA, "GPRMC, %f, %c, %f, %c, %f, %c, %f, %f, %d", &time, &validity, &latitude, &ns, &longitude, &ew, &speed, &heading, &date) >=1) { - if(fixtype == '0') { - return 0; - } - if(fixtype == '1') { - fixname = "Positive"; - } - if(fixtype == '2') { - fixname = "Differential"; - } - if(ns =='S') { - latitude *= -1.0; - } - if(ew =='W') { - longitude *= -1.0; - } - float degrees = trunc(latitude / 100.0f); - float minutes = latitude - (degrees * 100.0f); - latitude = degrees + minutes / 60.0f; - degrees = trunc(longitude / 100.0f); - minutes = longitude - (degrees * 100.0f); - longitude = degrees + minutes / 60.0f; - return 1; - } - } -} - - -float GPS::trunc(float v) -{ - if(v < 0.0) { - v*= -1.0; - v = floor(v); - v*=-1.0; - } else { - v = floor(v); - } - return v; -} - -void GPS::getData() -{ - while(_UltimateGps.getc() != '$'); - for(int i=0; i<256; i++) { - NEMA[i] = _UltimateGps.getc(); - if(NEMA[i] == '\r') { - NEMA[i] = 0; - return; - } - } - error("overflowed message limit"); -} - -void GPS::Init() -{ - _UltimateGps.printf("$PMTK220,1000*1F\r\n"); - wait(1); - _UltimateGps.printf("$PMTK314,0,1,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0*28\r\n"); - wait(1); -} +#include "GPS.h" + +GPS::GPS(PinName tx, PinName rx) : _UltimateGps(tx, rx) +{ + _UltimateGps.baud(9600); +} + +int GPS::parseData() +{ + + while(1) { + getData(); + if(sscanf(NEMA, "GPGGA, %*f, %*f, %*c, %*f, %*c, %d, %d, %*f, %f", &fixtype, &satellites, &altitude) >=1); + if(sscanf(NEMA, "GPRMC, %f, %c, %f, %c, %f, %c, %f, %f, %d", &time, &validity, &latitude, &ns, &longitude, &ew, &speed, &heading, &date) >=1) { + if(fixtype == 0) { + return 0; + } + if(ns =='S') { + latitude *= -1.0; + } + if(ew =='W') { + longitude *= -1.0; + } + float degrees = trunc(latitude / 100.0f); + float minutes = latitude - (degrees * 100.0f); + latitude = degrees + minutes / 60.0f; + degrees = trunc(longitude / 100.0f); + minutes = longitude - (degrees * 100.0f); + longitude = degrees + minutes / 60.0f; + return 1; + } + } +} + + +float GPS::trunc(float v) +{ + if(v < 0.0) { + v*= -1.0; + v = floor(v); + v*=-1.0; + } else { + v = floor(v); + } + return v; +} + +void GPS::getData() +{ + while(_UltimateGps.getc() != '$'); + for(int i=0; i<256; i++) { + NEMA[i] = _UltimateGps.getc(); + if(NEMA[i] == '\r') { + NEMA[i] = 0; + return; + } + } + error("overflowed message limit"); +} + +void GPS::Init() +{ + _UltimateGps.printf("$PMTK220,1000*1F\r\n"); + wait(1); + _UltimateGps.printf("$PMTK314,0,1,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0*28\r\n"); + wait(1); +}