Make low power the default for millis()

Author: sebromero

cores/arduino/Arduino.h

@@ -143,21 +143,4 @@ extern analogin_config_t adcCurrentConfig;
 
 #include "macros.h"
 
-/**
- * Power Management
- **/
-
-#if DEVICE_LPTICKER
-  /**
-   * Enables the low power timer being used by the timing functions
-   * millis() and micros()
-   * */  
-  void enableLowPowerTimer();
-
-  /** 
-   * Disables the low power timer
-   * */
-  void disableLowPowerTimer();
-#endif
-
 #endif

cores/arduino/wiring.cpp

@@ -33,37 +33,19 @@ static mbed::Timer timer;
 
 #if DEVICE_LPTICKER
   static mbed::LowPowerTimer lowPowerTimer;
-  static bool useLowPowerTimer = false;
-
-  void enableLowPowerTimer(){
-    timer.stop();
-    useLowPowerTimer = true;
-    lowPowerTimer.start();
-  }
-
-  void disableLowPowerTimer(){
-    lowPowerTimer.stop();
-    useLowPowerTimer = false;
-    timer.start();
-  }
+#else
+  // Fallback for devices which don't support
+  // a low power ticker.
+  static mbed::Timer lowPowerTimer;
 #endif
 
-
-std::chrono::microseconds elapsedTime(){
-  #if DEVICE_LPTICKER
-    return useLowPowerTimer ? lowPowerTimer.elapsed_time() : timer.elapsed_time();  
-  #else
-    return timer.elapsed_time();
-  #endif
-}
-
 unsigned long millis()
 {
-  return duration_cast<milliseconds>(elapsedTime()).count();
+  return duration_cast<milliseconds>(lowPowerTimer.elapsed_time()).count();
 }
 
 unsigned long micros() {
-  return elapsedTime().count();
+  return timer.elapsed_time().count();
 }
 
 void delay(unsigned long ms)
@@ -83,6 +65,7 @@ void delayMicroseconds(unsigned int us)
 void init()
 {
   timer.start();
+  lowPowerTimer.start();
 }
 
 void yield() {