Joseph Bradshaw
library for parsing GPS NMEA strings using serial receive interrupt
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GPSINT
by 
Joseph Bradshaw
GPSINT library
Library class for intercepting NMEA-0183 ASCII strings from a GPS using a serial interrupt at 4800 baud, error checking, and parsing using the scanf functions to update object associated variables
include the mbed library with this snippet
// mbed GPS Parse Program, tested using the Trimble Copernicus II
#include "mbed.h"
#include "GPSINT.h"
#define TIMEZONE -4 //Eastern Standard Time
Serial pc(USBTX,USBRX);
GPSINT gps(p28, p27); //Tx,Rx
DigitalOut led1(LED1);
// ---------------- MAIN ------------------------
int main() {
pc.baud(921600);
while(1) {
if(gps.lock != 0){
led1=!led1;
int gpsHour = (int)((int)gps.utc_time/10000) + TIMEZONE;
if(gpsHour < 0)
gpsHour += 24;
int gpsMin = (int)((int)gps.utc_time/100%100);
int gpsSec = (int)gps.utc_time % 100;
pc.printf("lock=%d %2d:%02d:%02d %f %c %f %c\r\n", gps.lock, gpsHour,gpsMin,gpsSec,gps.nmea_longitude, gps.ns, gps.nmea_latitude, gps.ew);
wait(.9);
}
else{
pc.printf("No Lock\r\n");
wait(1);
}
}//while(1)
}//main