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GPS.ino

@@ -0,0 +1,176 @@
+/*********************************************************************************************************************************/
+// Get data from the GPS, Get other variables, generate the two messages, print some debug info
+void CheckGPS()
+{    
+  processGPSData();
+  process_wspr_message();
+  printGPSData();
+}
+
+/*********************************************************************************************************************************/
+// This custom version of delay() ensures that the gps object is being "fed".
+
+static void smartDelay(unsigned long ms)
+{
+  unsigned long start = millis();
+  do 
+  {
+    while (SerialGPS.available())
+      gps.encode(SerialGPS.read());
+  } while (millis() - start < ms);
+}
+
+/*********************************************************************************************************************************/
+// Blink a LED for visual status information
+// Blink 'nr' times for 'ms' milliseconds 
+void BlinkLED(unsigned int nr, unsigned int ms)
+{
+  if (LED_PIN > 0)
+  {
+    int i = 0;
+
+    for (i=0; i<nr; i++)
+    {
+      digitalWrite(LED_PIN,HIGH);
+      delay(ms);
+      digitalWrite(LED_PIN,LOW); 
+      delay(ms);
+    }
+  }
+}
+
+
+/*********************************************************************************************************************************/
+// Process all data from the GPS and check the GPS time to see if we need to start send WSPR
+static void processGPSData()
+{
+  // Get the statyus of the satellites  
+  if (gps.satellites.isValid())
+  {
+    UGPS.Satellites = gps.satellites.value();
+  }
+  else
+  {
+    UGPS.Satellites = 0;
+  }
+
+ // Time
+ if (gps.time.isValid())
+ {
+    UGPS.Hours = gps.time.hour();
+    UGPS.Minutes = gps.time.minute();
+    UGPS.Seconds = gps.time.second();
+ }
+ else
+ {
+    UGPS.Hours = 0;
+    UGPS.Minutes = 0;
+    UGPS.Seconds = 0;
+ }
+
+ // Position
+ if (gps.location.isValid())
+ {
+    // Set the GPS location
+    UGPS.Longitude = gps.location.lng();
+    UGPS.Latitude = gps.location.lat();
+    UGPS.GPS_valid = 1;
+    // Translate the GPS position to a Maidenhead location
+    Get_MaidenHead();
+
+    // Blink the LED twice for 50ms to show that the GPS location is valid
+    BlinkLED(2,50);
+        // Check if it is time to transmit
+    if ((UGPS.Seconds <= 2) && (UGPS.Minutes % 2 == 0)) 
+    {
+      //We need to get the correct frequency en transmit power
+      switch (UGPS.Minutes)
+      {
+        case 0:
+        case 12:
+        case 24: 
+        case 36:
+        case 48: freq = freqArray[0]; break;
+        case 2: 
+        case 14:
+        case 26:
+        case 38:
+        case 50: freq = freqArray[1]; break;
+        case 4:
+        case 16:
+        case 28:
+        case 40:
+        case 52: freq = freqArray[2]; break;
+        case 6:
+        case 18:
+        case 30:
+        case 42:
+        case 54: freq = freqArray[3]; break;
+        case 8:
+        case 20:
+        case 32:
+        case 44:
+        case 56: freq = freqArray[4]; break;
+        default:  freq = freqArray[5];
+      }
+      UGPS.sendMsg1 = true;
+    } 
+ }
+ else
+ {
+   // Invalid GPS location
+   UGPS.Longitude = 0;
+   UGPS.Latitude = 0;
+   UGPS.GPS_valid = 0;
+ }
+
+}
+
+/*********************************************************************************************************************************/
+void printGPSData()
+{
+#if defined(DEVMODE)   
+  Serial.print(F("       Valid Time: ")); Serial.println(gps.time.isValid()); 
+  Serial.print(F("   Valid Location: ")); Serial.println(gps.location.isValid()); 
+  Serial.print(F("             Time: ")); Serial.print(UGPS.Hours); Serial.print(F(":")); Serial.print(UGPS.Minutes); Serial.print(F(":")); Serial.println(UGPS.Seconds);
+  Serial.print(F("         Latitude: ")); Serial.println(UGPS.Latitude, 6);
+  Serial.print(F("        Longitude: ")); Serial.println(UGPS.Longitude, 6);
+  Serial.print(F("       Satellites: ")); Serial.println(UGPS.Satellites);
+  Serial.print(F("       Maidenhead: ")); Serial.println(MaidenHead);
+  Serial.println();
+  Serial.println(F("-------------------------"));  
+#endif
+}
+
+
+/*********************************************************************************************************************************/
+// Calculate the Maidenhead locator out of GPS coordinates
+void Get_MaidenHead()
+{
+  int o1, o2, o3;
+  int a1, a2, a3;
+  double remainder;
+
+  // longitude
+  remainder = UGPS.Longitude + 180.0;
+  o1 = (int)(remainder / 20.0);
+  remainder = remainder - (double)o1 * 20.0;
+  o2 = (int)(remainder / 2.0);
+  remainder = remainder - 2.0 * (double)o2;
+  o3 = (int)(12.0 * remainder);
+
+  // latitude
+  remainder = UGPS.Latitude + 90.0;
+  a1 = (int)(remainder / 10.0);
+  remainder = remainder - (double)a1 * 10.0;
+  a2 = (int)(remainder);
+  remainder = remainder - (double)a2;
+  a3 = (int)(24.0 * remainder);
+  MaidenHead[0] = (char)o1 + 'A';
+  MaidenHead[1] = (char)a1 + 'A';
+  MaidenHead[2] = (char)o2 + '0';
+  MaidenHead[3] = (char)a2 + '0';
+  MaidenHead[4] = (char)o3 + 'A';
+  MaidenHead[5] = (char)a3 + 'A';
+  MaidenHead[6] = (char)0;
+}