implement most of sleep handling for the new radio stack

src/rf95/RadioInterface.h

@@ -67,7 +67,7 @@ class RadioInterface
      *
      * This method must be used before putting the CPU into deep or light sleep.
      */
-    bool canSleep() { return true; }
+    virtual bool canSleep() { return true; }
 
     /// Prepare hardware for sleep.  Call this _only_ for deep sleep, not needed for light sleep.
     virtual bool sleep() { return true; }

src/rf95/RadioLibInterface.cpp

@@ -89,6 +89,15 @@ ErrorCode RadioLibInterface::send(MeshPacket *p)
     }
 }
 
+bool RadioLibInterface::canSleep()
+{
+    bool res = txQueue.isEmpty();
+    if (!res) // only print debug messages if we are vetoing sleep
+        DEBUG_MSG("radio wait to sleep, txEmpty=%d\n", txQueue.isEmpty());
+
+    return res;
+}
+
 void RadioLibInterface::loop()
 {
     PendingISR wasPending = pending; // atomic read

src/rf95/RadioLibInterface.h

@@ -88,6 +88,13 @@ class RadioLibInterface : public RadioInterface
 
     virtual void loop(); // Idle processing
 
+    /**
+     * Return true if we think the board can go to sleep (i.e. our tx queue is empty, we are not sending or receiving)
+     *
+     * This method must be used before putting the CPU into deep or light sleep.
+     */
+    virtual bool canSleep();
+
   private:
     /** start an immediate transmit */
     void startSend(MeshPacket *txp);

src/rf95/SX1262Interface.cpp

@@ -107,4 +107,15 @@ bool SX1262Interface::canSendImmediately()
         DEBUG_MSG("Can not set now, busyTx=%d, busyRx=%d\n", busyTx, busyRx);
 
     return !busyTx && !busyRx;
+}
+
+
+
+bool SX1262Interface::sleep()
+{
+    // we no longer care about interrupts from this device
+    // prepareDeepSleep();
+
+    // FIXME - put chipset into sleep mode
+    return false;
 }

src/rf95/SX1262Interface.h

@@ -19,6 +19,9 @@ class SX1262Interface : public RadioLibInterface
     /// \return true if initialisation succeeded.
     virtual bool reconfigure();
 
+    /// Prepare hardware for sleep.  Call this _only_ for deep sleep, not needed for light sleep.
+    virtual bool sleep();
+
   protected:
     /**
      * Glue functions called from ISR land