Diff: main.cpp

Revision:

0:604848fcb49c

Child:

1:b100ab44119d

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Dec 22 03:37:10 2016 +0000
@@ -0,0 +1,67 @@
+//gps.cpp
+//for use with Adafruit Ultimate GPS
+//Reads in and parses GPS data
+ 
+#include "mbed.h"
+#include "MBed_Adafruit_GPS.h"
+ 
+Serial * gps_Serial;
+Serial pct (USBTX, USBRX);
+
+int main() {
+    
+    pct.baud(115200); //sets virtual COM serial communication to high rate; this is to allow more time to be spent on GPS retrieval
+    
+    gps_Serial = new Serial(PTC17,PTC16); //serial object for use w/ GPS
+    Adafruit_GPS myGPS(gps_Serial); //object of Adafruit's GPS class
+    char c; //when read via Adafruit_GPS::read(), the class returns single character stored here
+    Timer refresh_Timer; //sets up a timer for use in loop; how often do we print GPS info?
+    const int refresh_Time = 2000; //refresh time in ms
+    
+    myGPS.begin(9600);  //sets baud rate for GPS communication; note this may be changed via Adafruit_GPS::sendCommand(char *)
+                        //a list of GPS commands is available at http://www.adafruit.com/datasheets/PMTK_A08.pdf
+    
+    myGPS.sendCommand(PMTK_SET_NMEA_OUTPUT_RMCGGA); //these commands are defined in MBed_Adafruit_GPS.h; a link is provided there for command creation
+    myGPS.sendCommand(PMTK_SET_NMEA_UPDATE_1HZ);
+    myGPS.sendCommand(PGCMD_ANTENNA);
+    
+    pct.printf("Connection established at 115200 baud...\n");
+    
+    wait(1);
+    
+    refresh_Timer.start();  //starts the clock on the timer
+    
+    while(true){
+        c = myGPS.read();   //queries the GPS
+        
+        if (c) { pct.printf("%c", c); } //this line will echo the GPS data if not paused
+        
+        //check if we recieved a new message from GPS, if so, attempt to parse it,
+        if ( myGPS.newNMEAreceived() ) {
+            if ( !myGPS.parse(myGPS.lastNMEA()) ) {
+                continue;   
+            }    
+        }
+        
+        //check if enough time has passed to warrant printing GPS info to screen
+        //note if refresh_Time is too low or pc.baud is too low, GPS data may be lost during printing
+        if (refresh_Timer.read_ms() >= refresh_Time) {
+            refresh_Timer.reset();
+            pct.printf("Time: %d:%d:%d.%u\n", myGPS.hour, myGPS.minute, myGPS.seconds, myGPS.milliseconds);
+            pct.printf("Date: %d/%d/20%d\n", myGPS.day, myGPS.month, myGPS.year);
+            pct.printf("Fix: %d\n", (int) myGPS.fix);
+            pct.printf("Quality: %d\n", (int) myGPS.fixquality);
+            if (myGPS.fix) {
+                pct.printf("Location: %5.2f%c, %5.2f%c\n", myGPS.latitude, myGPS.lat, myGPS.longitude, myGPS.lon);
+                pct.printf("Speed: %5.2f knots\n", myGPS.speed);
+                pct.printf("Angle: %5.2f\n", myGPS.angle);
+                pct.printf("Altitude: %5.2f\n", myGPS.altitude);
+                pct.printf("Satellites: %d\n", myGPS.satellites);
+            }
+            
+        }
+        
+    }
+    
+    
+}
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