remove rtos_idle_callback(), sketch define vApplicationIdleHook() if needed

Author: hathach

cores/nRF5/Arduino.h

@@ -119,8 +119,6 @@ void suspendLoop(void);
 #define portInputRegister(port)    ( (volatile uint32_t*) &(port->IN) )
 #define portModeRegister(port)     ( &(port->DIR) )
 #define digitalPinHasPWM(P)        ( g_ADigitalPinMap[P] > 1 )
-
-void rtos_idle_callback(void) ATTR_WEAK;
 /*
  * digitalPinToTimer(..) is AVR-specific and is not defined for nRF52
  * architecture. If you need to check if a pin supports PWM you must

cores/nRF5/hooks.c

@@ -30,6 +30,8 @@ static void __empty() {
 }
 void yield(void) __attribute__ ((weak, alias("__empty")));
 
+void vApplicationIdleHook( void ) __attribute__ ((weak, alias("__empty")));
+
 /**
  * SysTick hook
  *

cores/nRF5/rtos.cpp

@@ -101,12 +101,6 @@ void vApplicationMallocFailedHook(void)
   LOG_LV1("RTOS", "Failed to Malloc");
 }
 
-void vApplicationIdleHook( void )
-{
-  // Call user callback if defined
-  if ( rtos_idle_callback ) rtos_idle_callback();
-}
-
 /* configSUPPORT_STATIC_ALLOCATION is set to 1, so the application must provide an
  * implementation of vApplicationGetIdleTaskMemory() to provide the memory that is
  * used by the Idle task. */