Andy K / MODGPS

Allows for a GPS module to be connected to a serial port and exposes an easy to use API to get the GPS data. New feature, added Mbed/LPC17xx RTC synchronisation

Dependents:   SatGPS AntiTheftGPS FLIGHT_CONTROL_AND_COMMUNICATIONS_SYSTEM GPS-Lora ... more

example1.cpp@6:64771e31464e, 2011-04-21 (annotated)

Committer:
AjK
Date:
Thu Apr 21 14:06:17 2011 +0000
Revision:
6:64771e31464e
Parent:
2:8aa059e7d8b1 
1.16 See ChangeLog.c

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AjK 2:8aa059e7d8b1 1 #ifdef COMPILE_EXAMPLE1_CODE_MODGPS
AjK 1:6aec92e77ad2 2
AjK 1:6aec92e77ad2 3 #include "mbed.h"
AjK 1:6aec92e77ad2 4 #include "GPS.h"
AjK 1:6aec92e77ad2 5
AjK 1:6aec92e77ad2 6 Serial pc(USBTX, USBRX);
AjK 1:6aec92e77ad2 7 DigitalOut led1(LED1);
AjK 1:6aec92e77ad2 8
AjK 1:6aec92e77ad2 9 // SET THIS.
AjK 1:6aec92e77ad2 10 // Create an instance of the GPS object. You will need to
AjK 1:6aec92e77ad2 11 // set p25 to whichever Serial RX pin you have connected
AjK 1:6aec92e77ad2 12 // your GPS module to.
AjK 1:6aec92e77ad2 13 GPS gps(NC, GPSRX);
AjK 1:6aec92e77ad2 14
AjK 6:64771e31464e 15 char rmc[GPS_BUFFER_LEN];
AjK 6:64771e31464e 16 char gga[GPS_BUFFER_LEN];
AjK 6:64771e31464e 17 char vtg[GPS_BUFFER_LEN];
AjK 6:64771e31464e 18 char ukn[GPS_BUFFER_LEN];
AjK 6:64771e31464e 19
AjK 1:6aec92e77ad2 20 // 0.1 second flash of LED2
AjK 1:6aec92e77ad2 21 DigitalOut led2(LED2);
AjK 1:6aec92e77ad2 22 Timeout t2;
AjK 1:6aec92e77ad2 23 void t2out(void) { led2 = 0; }
AjK 1:6aec92e77ad2 24 void blip2(void) { led2 = 1; t2.attach(&t2out, 0.1); }
AjK 1:6aec92e77ad2 25
AjK 1:6aec92e77ad2 26 // 0.1 second flash of LED3
AjK 1:6aec92e77ad2 27 DigitalOut led3(LED3);
AjK 1:6aec92e77ad2 28 Timeout t3;
AjK 1:6aec92e77ad2 29 void t3out(void) { led3 = 0; }
AjK 1:6aec92e77ad2 30 void blip3(void) { led3 = 1; t3.attach(&t3out, 0.1); }
AjK 1:6aec92e77ad2 31
AjK 1:6aec92e77ad2 32 // 0.1 second flash of LED4
AjK 1:6aec92e77ad2 33 DigitalOut led4(LED4);
AjK 1:6aec92e77ad2 34
AjK 1:6aec92e77ad2 35 Timeout t4;
AjK 1:6aec92e77ad2 36 void t4out(void) { led4 = 0; }
AjK 1:6aec92e77ad2 37 void blip4(void) { led4 = 1; t4.attach(&t4out, 0.1); }
AjK 1:6aec92e77ad2 38
AjK 1:6aec92e77ad2 39 int main() {
AjK 1:6aec92e77ad2 40 GPS_Time q1;
AjK 1:6aec92e77ad2 41
AjK 1:6aec92e77ad2 42 // SET THIS.
AjK 1:6aec92e77ad2 43 // Ensure you set the baud rate to match your serial
AjK 1:6aec92e77ad2 44 // communications to your PC/Max/Linux host so you
AjK 1:6aec92e77ad2 45 // can read the messages.
AjK 1:6aec92e77ad2 46 pc.baud(PCBAUD);
AjK 1:6aec92e77ad2 47
AjK 6:64771e31464e 48 // Tell MODGPS "we want copies of the NMEA sentences". When a callback
AjK 6:64771e31464e 49 // is made our buffers will contain a copy of the last received sentence
AjK 6:64771e31464e 50 // before it was processed/destroyed.
AjK 6:64771e31464e 51 gps.setRmc(rmc);
AjK 6:64771e31464e 52 gps.setGga(gga);
AjK 6:64771e31464e 53 gps.setVtg(vtg);
AjK 6:64771e31464e 54 gps.setUkn(ukn);
AjK 6:64771e31464e 55
AjK 1:6aec92e77ad2 56 // SET THIS.
AjK 1:6aec92e77ad2 57 // Most GPS modules use 9600,8,n,1 so that's what
AjK 1:6aec92e77ad2 58 // we default to here. Ensure your GPS module matches
AjK 1:6aec92e77ad2 59 // this, otherwise set it to match.
AjK 1:6aec92e77ad2 60 gps.baud(GPSBUAD);
AjK 1:6aec92e77ad2 61 gps.format(8, GPS::None, 1);
AjK 1:6aec92e77ad2 62
AjK 1:6aec92e77ad2 63 // OPTIONAL
AjK 1:6aec92e77ad2 64 // If you GPS has a 1 pulse per second output you can
AjK 1:6aec92e77ad2 65 // connect it to an Mbed pin. Here you specify what pin
AjK 1:6aec92e77ad2 66 // and on what "edge" teh signal is active. If your GPS
AjK 1:6aec92e77ad2 67 // module has a rising edge at the one second point then
AjK 1:6aec92e77ad2 68 // use GPS::ppsRise
AjK 1:6aec92e77ad2 69 #ifdef PPSPIN
AjK 1:6aec92e77ad2 70 gps.ppsAttach(PPSPIN, GPS::ppsFall);
AjK 1:6aec92e77ad2 71 #endif
AjK 1:6aec92e77ad2 72
AjK 1:6aec92e77ad2 73 // Sample of a callback to a function when the 1PPS activates.
AjK 1:6aec92e77ad2 74 // For this example, we flash LED2 for 0.1 second.
AjK 1:6aec92e77ad2 75 gps.attach_pps(&blip2);
AjK 1:6aec92e77ad2 76
AjK 1:6aec92e77ad2 77 // Sample of a callback to a function when a NMEA GGA message is recieved.
AjK 1:6aec92e77ad2 78 // For this example, we flash LED2 for 0.1 second.
AjK 1:6aec92e77ad2 79 gps.attach_gga(&blip3);
AjK 1:6aec92e77ad2 80
AjK 1:6aec92e77ad2 81 // Sample of a callback to a function when a NMEA RMC message is recieved.
AjK 1:6aec92e77ad2 82 // For this example, we flash LED2 for 0.1 second.
AjK 1:6aec92e77ad2 83 gps.attach_rmc(&blip4);
AjK 1:6aec92e77ad2 84
AjK 1:6aec92e77ad2 85 while(1) {
AjK 1:6aec92e77ad2 86 // Every 3 seconds, flip LED1 and print the basic GPS info.
AjK 1:6aec92e77ad2 87 wait(3);
AjK 1:6aec92e77ad2 88 led1 = 1;
AjK 1:6aec92e77ad2 89
AjK 1:6aec92e77ad2 90 // Demonstrate how to find out the GPS location co-ords.
AjK 1:6aec92e77ad2 91 pc.printf("Method 1. Lat = %.4f ", gps.latitude());
AjK 1:6aec92e77ad2 92 pc.printf("Lon = %.4f ", gps.longitude());
AjK 1:6aec92e77ad2 93 pc.printf("Alt = %.4f ", gps.altitude());
AjK 1:6aec92e77ad2 94
AjK 1:6aec92e77ad2 95 // Gran a snapshot of the current time.
AjK 1:6aec92e77ad2 96 gps.timeNow(&q1);
AjK 1:6aec92e77ad2 97 pc.printf("%02d:%02d:%02d %02d/%02d/%04d\r\n",
AjK 1:6aec92e77ad2 98 q1.hour, q1.minute, q1.second, q1.day, q1.month, q1.year);
AjK 1:6aec92e77ad2 99
AjK 1:6aec92e77ad2 100 // Alternative method that does the same thing.
AjK 1:6aec92e77ad2 101 pc.printf("Method 2. Lat = %.4f ", gps.latitude());
AjK 1:6aec92e77ad2 102 pc.printf("Lon = %.4f ", gps.longitude());
AjK 1:6aec92e77ad2 103 pc.printf("Alt = %.4f ", gps.altitude());
AjK 1:6aec92e77ad2 104
AjK 1:6aec92e77ad2 105 GPS_Time *q2 = gps.timeNow();
AjK 1:6aec92e77ad2 106 pc.printf("%02d:%02d:%02d %02d/%02d/%04d\r\n\n",
AjK 1:6aec92e77ad2 107 q2->hour, q2->minute, q2->second, q2->day, q2->month, q2->year);
AjK 1:6aec92e77ad2 108 delete(q2);
AjK 1:6aec92e77ad2 109 led1 = 0;
AjK 1:6aec92e77ad2 110 }
AjK 1:6aec92e77ad2 111 }
AjK 1:6aec92e77ad2 112
AjK 1:6aec92e77ad2 113 #endif