- // Transmit software version packet on start up.
- tncTxPacket(TNC_MODE_1200_AFSK);
-
- // Counters to send packets if the GPS time stamp is not available.
- lockLostCounter = 5;
- utcSeconds = 55;
-
- // This is the main loop that process GPS data and waits for the once per second timer tick.
- for (i = 0; i < 3; i++)
- {
- audio_gap(10);
- // Read the GPS engine serial port FIFO and process the GPS data.
-// gpsUpdate();
-
- if (gpsIsReady())
- {
- // Start the flight timer when we get a valid 3D fix.
- if (gpsGetFixType() == GPS_3D_FIX)
- timeSetRunFlag();
-
- // Generate our packets based on the GPS time.
- if (tncIsTimeSlot(gpsPosition.seconds))
- tncTxPacket(TNC_MODE_1200_AFSK);
-
- // Sync the internal clock to GPS UTC time.
- utcSeconds = gpsPosition.seconds;
-
- // This counter is reset every time we receive the GPS message.
- lockLostCounter = 0;
-
- // Log the data to flash.
-// sysLogGPSData();
- } // END if gpsIsReady
-
- // Processing that occurs once a second.
- if (timeIsUpdate())
- {
- // We maintain the UTC time in seconds if we shut off the GPS engine or it fails.
- if (++utcSeconds == 60)
- utcSeconds = 0;
-
- // If we loose information for more than 5 seconds,
- // we will determine when to send a packet based on internal time.
- if (lockLostCounter == 5)
- {
- if (tncIsTimeSlot(utcSeconds))
- tncTxPacket(TNC_MODE_1200_AFSK);
- } else
- ++lockLostCounter;
-
- // Update the ADC filters.
-// adcUpdate();
-
- if (timeHours == 5 && timeMinutes == 0 && timeSeconds == 0)
- gpsPowerOff();
-
- } // END if timeIsUpdate
-
- } // END for
- return 0;
-}