Diff: main.cpp

Revision:

0:d0dc7d932753

diff -r 000000000000 -r d0dc7d932753 main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Sep 12 12:15:31 2013 +0000
@@ -0,0 +1,114 @@
+#include "mbed.h"
+#include "GPS.h"
+
+#define PCBAUD 9600
+#define GPSRX p14
+#define GPSBAUD 9600
+
+
+Serial pc(USBTX, USBRX);
+DigitalOut led1(LED1);
+
+// SET THIS.
+// Create an instance of the GPS object. You will need to
+// set p25 to whichever Serial RX pin you have connected
+// your GPS module to.
+GPS gps(NC, p14);
+
+char rmc[GPS_BUFFER_LEN];
+char gga[GPS_BUFFER_LEN];
+char vtg[GPS_BUFFER_LEN];
+char ukn[GPS_BUFFER_LEN];
+
+// 0.1 second flash of LED2
+DigitalOut led2(LED2);
+Timeout t2;
+void t2out(void) { led2 = 0; }
+void blip2(void) { led2 = 1; t2.attach(&t2out, 0.1); }
+
+// 0.1 second flash of LED3
+DigitalOut led3(LED3);
+Timeout t3;
+void t3out(void) { led3 = 0; }
+void blip3(void) { led3 = 1; t3.attach(&t3out, 0.1); }
+
+// 0.1 second flash of LED4
+DigitalOut led4(LED4);
+
+Timeout t4;
+void t4out(void) { led4 = 0; }
+void blip4(void) { led4 = 1; t4.attach(&t4out, 0.1); }
+
+int main() {
+    GPS_Time q1;
+    
+    // SET THIS.
+    // Ensure you set the baud rate to match your serial
+    // communications to your PC/Max/Linux host so you
+    // can read the messages.
+    pc.baud(PCBAUD);
+    
+    // Tell MODGPS "we want copies of the NMEA sentences". When a callback
+    // is made our buffers will contain a copy of the last received sentence
+    // before it was processed/destroyed.    
+    gps.setRmc(rmc);
+    gps.setGga(gga);
+    gps.setVtg(vtg);
+    gps.setUkn(ukn);
+    
+    // SET THIS.
+    // Most GPS modules use 9600,8,n,1 so that's what
+    // we default to here. Ensure your GPS module matches
+    // this, otherwise set it to match.
+    gps.baud(GPSBAUD);
+    gps.format(8, GPS::None, 1);
+    
+    // OPTIONAL
+    // If you GPS has a 1 pulse per second output you can
+    // connect it to an Mbed pin. Here you specify what pin
+    // and on what "edge" teh signal is active. If your GPS
+    // module has a rising edge at the one second point then
+    // use GPS::ppsRise
+    #ifdef PPSPIN
+    gps.ppsAttach(PPSPIN, GPS::ppsFall);
+    #endif
+
+    // Sample of a callback to a function when the 1PPS activates.
+    // For this example, we flash LED2 for 0.1 second.
+    gps.attach_pps(&blip2);
+    
+    // Sample of a callback to a function when a NMEA GGA message is recieved.
+    // For this example, we flash LED2 for 0.1 second.
+    gps.attach_gga(&blip3);
+    
+    // Sample of a callback to a function when a NMEA RMC message is recieved.
+    // For this example, we flash LED2 for 0.1 second.
+    gps.attach_rmc(&blip4);
+
+    while(1) {
+        // Every 3 seconds, flip LED1 and print the basic GPS info.
+        wait(3);
+        led1 = 1;
+        
+        // Demonstrate how to find out the GPS location co-ords.
+        pc.printf("Method 1. Lat = %.4f ", gps.latitude());
+        pc.printf("Lon = %.4f ", gps.longitude());
+        pc.printf("Alt = %.4f ", gps.altitude());
+        
+        // Gran a snapshot of the current time.
+        gps.timeNow(&q1);
+        pc.printf("%02d:%02d:%02d %02d/%02d/%04d\r\n", 
+            q1.hour, q1.minute, q1.second, q1.day, q1.month, q1.year);
+            
+        // Alternative method that does the same thing.        
+        pc.printf("Method 2. Lat = %.4f ", gps.latitude());
+        pc.printf("Lon = %.4f ", gps.longitude());
+        pc.printf("Alt = %.4f ", gps.altitude());
+        
+        GPS_Time *q2 = gps.timeNow();
+        pc.printf("%02d:%02d:%02d %02d/%02d/%04d\r\n\n", 
+            q2->hour, q2->minute, q2->second, q2->day, q2->month, q2->year);
+        delete(q2);        
+        led1 = 0;
+    }
+}
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