main.cpp

00001 
00002 #include "mbed.h"
00003 #include "GPS.h"
00004 
00005 Serial pc(D8, PA_10); // tx, rx 
00006 DigitalOut led1(LED1);
00007 
00008 // SET THIS.
00009 // Create an instance of the GPS object. You will need to
00010 // set p25 to whichever Serial RX pin you have connected
00011 // your GPS module to.
00012 GPS gps(NC, D0);
00013 
00014 char rmc[GPS_BUFFER_LEN];
00015 char gga[GPS_BUFFER_LEN];
00016 char vtg[GPS_BUFFER_LEN];
00017 char ukn[GPS_BUFFER_LEN];
00018 
00019 // 0.1 second flash of LED2
00020 DigitalOut led2(LED2);
00021 Timeout t2;
00022 void t2out(void) { led2 = 0; }
00023 void blip2(void) { led2 = 1; t2.attach(&t2out, 0.1); }
00024 
00025 // 0.1 second flash of LED3
00026 DigitalOut led3(LED3);
00027 Timeout t3;
00028 void t3out(void) { led3 = 0; }
00029 void blip3(void) { led3 = 1; t3.attach(&t3out, 0.1); }
00030 
00031 // 0.1 second flash of LED4
00032 DigitalOut led4(LED4);
00033 
00034 Timeout t4;
00035 void t4out(void) { led4 = 0; }
00036 void blip4(void) { led4 = 1; t4.attach(&t4out, 0.1); }
00037 
00038 int main() {
00039     GPS_Time q1;
00040     
00041     // SET THIS.
00042     // Ensure you set the baud rate to match your serial
00043     // communications to your PC/Max/Linux host so you
00044     // can read the messages.
00045     pc.baud(PCBAUD);
00046     
00047     // Tell MODGPS "we want copies of the NMEA sentences". When a callback
00048     // is made our buffers will contain a copy of the last received sentence
00049     // before it was processed/destroyed.    
00050     gps.setRmc(rmc);
00051     gps.setGga(gga);
00052     gps.setVtg(vtg);
00053     gps.setUkn(ukn);
00054     
00055     // SET THIS.
00056     // Most GPS modules use 9600,8,n,1 so that's what
00057     // we default to here. Ensure your GPS module matches
00058     // this, otherwise set it to match.
00059     gps.baud(GPSBUAD);
00060     gps.format(8, GPS::None, 1);
00061     
00062     // OPTIONAL
00063     // If you GPS has a 1 pulse per second output you can
00064     // connect it to an Mbed pin. Here you specify what pin
00065     // and on what "edge" teh signal is active. If your GPS
00066     // module has a rising edge at the one second point then
00067     // use GPS::ppsRise
00068     #ifdef PPSPIN
00069     gps.ppsAttach(PPSPIN, GPS::ppsFall);
00070     #endif
00071 
00072     // Sample of a callback to a function when the 1PPS activates.
00073     // For this example, we flash LED2 for 0.1 second.
00074     gps.attach_pps(&blip2);
00075     
00076     // Sample of a callback to a function when a NMEA GGA message is recieved.
00077     // For this example, we flash LED2 for 0.1 second.
00078     gps.attach_gga(&blip3);
00079     
00080     // Sample of a callback to a function when a NMEA RMC message is recieved.
00081     // For this example, we flash LED2 for 0.1 second.
00082     gps.attach_rmc(&blip4);
00083 
00084     while(1) {
00085         // Every 3 seconds, flip LED1 and print the basic GPS info.
00086         wait(3);
00087         led1 = 1;
00088         
00089         // Demonstrate how to find out the GPS location co-ords.
00090         pc.printf("Method 1. Lat = %.4f ", gps.latitude());
00091         pc.printf("Lon = %.4f ", gps.longitude());
00092         pc.printf("Alt = %.4f ", gps.altitude());
00093         
00094         // Gran a snapshot of the current time.
00095         gps.timeNow(&q1);
00096         pc.printf("%02d:%02d:%02d %02d/%02d/%04d\r\n", 
00097             q1.hour, q1.minute, q1.second, q1.day, q1.month, q1.year);
00098             
00099         // Alternative method that does the same thing.        
00100         pc.printf("Method 2. Lat = %.4f ", gps.latitude());
00101         pc.printf("Lon = %.4f ", gps.longitude());
00102         pc.printf("Alt = %.4f ", gps.altitude());
00103         
00104         GPS_Time *q2 = gps.timeNow();
00105         pc.printf("%02d:%02d:%02d %02d/%02d/%04d\r\n\n", 
00106             q2->hour, q2->minute, q2->second, q2->day, q2->month, q2->year);
00107         delete(q2);        
00108         led1 = 0;
00109     }
00110 }
00111