move gps before refactoring

src/gps/GPS.h

@@ -0,0 +1,55 @@
+#pragma once
+
+#include "Observer.h"
+#include "PeriodicTask.h"
+#include "SparkFun_Ublox_Arduino_Library.h"
+#include "sys/time.h"
+
+/**
+ * A gps class that only reads from the GPS periodically (and FIXME - eventually keeps the gps powered down except when reading)
+ *
+ * When new data is available it will notify observers.
+ */
+class GPS : public PeriodicTask, public Observable<void *>
+{
+    SFE_UBLOX_GPS ublox;
+
+  public:
+    uint32_t latitude, longitude; // as an int mult by 1e-7 to get value as double
+    uint32_t altitude;
+    bool isConnected; // Do we have a GPS we are talking to
+
+    GPS();
+
+    /// Return time since 1970 in secs.  Until we have a GPS lock we will be returning time based at zero
+    uint32_t getTime();
+
+    /// Return time since 1970 in secs.  If we don't have a GPS lock return zero
+    uint32_t getValidTime();
+
+    void setup();
+
+    virtual void doTask();
+
+    /// If we haven't yet set our RTC this boot, set it from a GPS derived time
+    void perhapsSetRTC(const struct timeval *tv);
+
+    /// Returns true if we think the board can enter deep or light sleep now (we might be trying to get a GPS lock)
+    bool canSleep();
+
+    /// Prepare the GPS for the cpu entering deep or light sleep, expect to be gone for at least 100s of msecs
+    void prepareSleep();
+
+    /// Restart our lock attempt - try to get and broadcast a GPS reading ASAP
+    void startLock();
+
+    /// Returns ture if we have acquired GPS lock.
+    bool hasLock() const { return hasValidLocation; }
+
+  private:
+    void readFromRTC();
+
+    bool hasValidLocation = false; // default to false, until we complete our first read
+};
+
+extern GPS gps;