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@0:db98027c0bbb, 2010-11-15 (annotated)

Committer:
AjK
Date:
Mon Nov 15 20:11:16 2010 +0000
Revision:
0:db98027c0bbb
Child:
1:6aec92e77ad2
1.8

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AjK 0:db98027c0bbb 1 #ifdef COMPILE_EXAMPLE_CODE_MODGPS
AjK 0:db98027c0bbb 2
AjK 0:db98027c0bbb 3 #include "mbed.h"
AjK 0:db98027c0bbb 4 #include "GPS.h"
AjK 0:db98027c0bbb 5
AjK 0:db98027c0bbb 6 Serial pc(USBTX, USBRX);
AjK 0:db98027c0bbb 7 DigitalOut led1(LED1);
AjK 0:db98027c0bbb 8
AjK 0:db98027c0bbb 9 // SET THIS.
AjK 0:db98027c0bbb 10 // Create an instance of the GPS object. You will need to
AjK 0:db98027c0bbb 11 // set p25 to whichever Serial RX pin you have connected
AjK 0:db98027c0bbb 12 // your GPS module to.
AjK 0:db98027c0bbb 13 GPS gps(NC, GPSRX);
AjK 0:db98027c0bbb 14
AjK 0:db98027c0bbb 15 // 0.1 second flash of LED2
AjK 0:db98027c0bbb 16 DigitalOut led2(LED2);
AjK 0:db98027c0bbb 17 Timeout t2;
AjK 0:db98027c0bbb 18 void t2out(void) { led2 = 0; }
AjK 0:db98027c0bbb 19 void blip2(void) { led2 = 1; t2.attach(&t2out, 0.1); }
AjK 0:db98027c0bbb 20
AjK 0:db98027c0bbb 21 // 0.1 second flash of LED3
AjK 0:db98027c0bbb 22 DigitalOut led3(LED3);
AjK 0:db98027c0bbb 23 Timeout t3;
AjK 0:db98027c0bbb 24 void t3out(void) { led3 = 0; }
AjK 0:db98027c0bbb 25 void blip3(void) { led3 = 1; t3.attach(&t3out, 0.1); }
AjK 0:db98027c0bbb 26
AjK 0:db98027c0bbb 27 // 0.1 second flash of LED4
AjK 0:db98027c0bbb 28 DigitalOut led4(LED4);
AjK 0:db98027c0bbb 29
AjK 0:db98027c0bbb 30 Timeout t4;
AjK 0:db98027c0bbb 31 void t4out(void) { led4 = 0; }
AjK 0:db98027c0bbb 32 void blip4(void) { led4 = 1; t4.attach(&t4out, 0.1); }
AjK 0:db98027c0bbb 33
AjK 0:db98027c0bbb 34 int main() {
AjK 0:db98027c0bbb 35 GPS_Time q1;
AjK 0:db98027c0bbb 36
AjK 0:db98027c0bbb 37 // SET THIS.
AjK 0:db98027c0bbb 38 // Ensure you set the baud rate to match your serial
AjK 0:db98027c0bbb 39 // communications to your PC/Max/Linux host so you
AjK 0:db98027c0bbb 40 // can read the messages.
AjK 0:db98027c0bbb 41 pc.baud(PCBAUD);
AjK 0:db98027c0bbb 42
AjK 0:db98027c0bbb 43 // SET THIS.
AjK 0:db98027c0bbb 44 // Most GPS modules use 9600,8,n,1 so that's what
AjK 0:db98027c0bbb 45 // we default to here. Ensure your GPS module matches
AjK 0:db98027c0bbb 46 // this, otherwise set it to match.
AjK 0:db98027c0bbb 47 gps.baud(GPSBUAD);
AjK 0:db98027c0bbb 48 gps.format(8, GPS::None, 1);
AjK 0:db98027c0bbb 49
AjK 0:db98027c0bbb 50 // OPTIONAL
AjK 0:db98027c0bbb 51 // If you GPS has a 1 pulse per second output you can
AjK 0:db98027c0bbb 52 // connect it to an Mbed pin. Here you specify what pin
AjK 0:db98027c0bbb 53 // and on what "edge" teh signal is active. If your GPS
AjK 0:db98027c0bbb 54 // module has a rising edge at the one second point then
AjK 0:db98027c0bbb 55 // use GPS::ppsRise
AjK 0:db98027c0bbb 56 #ifdef PPSPIN
AjK 0:db98027c0bbb 57 gps.ppsAttach(PPSPIN, GPS::ppsFall);
AjK 0:db98027c0bbb 58 #endif
AjK 0:db98027c0bbb 59
AjK 0:db98027c0bbb 60 // Sample of a callback to a function when the 1PPS activates.
AjK 0:db98027c0bbb 61 // For this example, we flash LED2 for 0.1 second.
AjK 0:db98027c0bbb 62 gps.attach_pps(&blip2);
AjK 0:db98027c0bbb 63
AjK 0:db98027c0bbb 64 // Sample of a callback to a function when a NMEA GGA message is recieved.
AjK 0:db98027c0bbb 65 // For this example, we flash LED2 for 0.1 second.
AjK 0:db98027c0bbb 66 gps.attach_gga(&blip3);
AjK 0:db98027c0bbb 67
AjK 0:db98027c0bbb 68 // Sample of a callback to a function when a NMEA RMC message is recieved.
AjK 0:db98027c0bbb 69 // For this example, we flash LED2 for 0.1 second.
AjK 0:db98027c0bbb 70 gps.attach_rmc(&blip4);
AjK 0:db98027c0bbb 71
AjK 0:db98027c0bbb 72 while(1) {
AjK 0:db98027c0bbb 73 // Every 3 seconds, flip LED1 and print the basic GPS info.
AjK 0:db98027c0bbb 74 wait(3);
AjK 0:db98027c0bbb 75 led1 = 1;
AjK 0:db98027c0bbb 76
AjK 0:db98027c0bbb 77 // Demonstrate how to find out the GPS location co-ords.
AjK 0:db98027c0bbb 78 pc.printf("Method 1. Lat = %.4f ", gps.latitude());
AjK 0:db98027c0bbb 79 pc.printf("Lon = %.4f ", gps.longitude());
AjK 0:db98027c0bbb 80 pc.printf("Alt = %.4f ", gps.altitude());
AjK 0:db98027c0bbb 81
AjK 0:db98027c0bbb 82 // Gran a snapshot of the current time.
AjK 0:db98027c0bbb 83 gps.timeNow(&q1);
AjK 0:db98027c0bbb 84 pc.printf("%02d:%02d:%02d %02d/%02d/%04d\r\n",
AjK 0:db98027c0bbb 85 q1.hour, q1.minute, q1.second, q1.day, q1.month, q1.year);
AjK 0:db98027c0bbb 86
AjK 0:db98027c0bbb 87 // Alternative method that does the same thing.
AjK 0:db98027c0bbb 88 pc.printf("Method 2. Lat = %.4f ", gps.latitude());
AjK 0:db98027c0bbb 89 pc.printf("Lon = %.4f ", gps.longitude());
AjK 0:db98027c0bbb 90 pc.printf("Alt = %.4f ", gps.altitude());
AjK 0:db98027c0bbb 91
AjK 0:db98027c0bbb 92 GPS_Time *q2 = gps.timeNow();
AjK 0:db98027c0bbb 93 pc.printf("%02d:%02d:%02d %02d/%02d/%04d\r\n\n",
AjK 0:db98027c0bbb 94 q2->hour, q2->minute, q2->second, q2->day, q2->month, q2->year);
AjK 0:db98027c0bbb 95 delete(q2);
AjK 0:db98027c0bbb 96 led1 = 0;
AjK 0:db98027c0bbb 97 }
AjK 0:db98027c0bbb 98 }
AjK 0:db98027c0bbb 99
AjK 0:db98027c0bbb 100 #endif