wakeup function

[SRAM.11]

Please some one help me to how to get controller from sleep the configuration I made is not working.The below given code working fine and putting the controller in sleep but controller not waking up.The condition depends on mains (ADC Input channel 5)when it detects a value other than zero in mains voltage my controller should wake-up

 

 

 

 

 

while(MV<100)
	{
		ADC_Read1(&MV);
	 delay_ms(100);
		Set_LED(0);
		idle_counter++;
		
		if (idle_counter>=300)
		{
		
		 EnterSleepMode();
		}
 
	}



// rest of the code//


void TIM2_Config(void)
{
 TIM2_TimeBaseInit(TIM2_PRESCALER_32768, 244);
 TIM2_ClearFlag(TIM2_FLAG_UPDATE);
 TIM2_ITConfig(TIM2_IT_UPDATE, ENABLE);
 TIM2_Cmd(ENABLE);
		AWU_DeInit();
		
		/* auto wake up at 32ms */
		AWU_Init(AWU_TIMEBASE_32MS);
		
		/* enable auto wake up*/
		AWU_Cmd(ENABLE);
		
		enableInterrupts();
}


 
INTERRUPT_HANDLER(TIM2_UPD_OVF_BRK_IRQHandler, 13)
{
 if (TIM2_GetITStatus(TIM2_IT_UPDATE) != RESET)
 {
			
 // Increment the idle_counter every 500ms
 idle_counter++;

 // Enter sleep mode if idle for approximately 30 seconds (60 * 500ms)
 if (idle_counter >= 300)
 {
 EnterSleepMode();
 }
				TIM2_ClearITPendingBit(TIM2_IT_UPDATE);
 }
}

void EnterSleepMode(void)
{
 // Disable TIM2 interrupt
 TIM2_ITConfig(TIM2_IT_UPDATE, DISABLE);

 // Disable ADC peripheral
 ADC1_Cmd(DISABLE);

 // Disable GPIO inputs
 GPIO_Init(GPIOD, GPIO_PIN_3, GPIO_MODE_IN_PU_NO_IT);
 GPIO_Init(GPIOD, GPIO_PIN_5, GPIO_MODE_IN_FL_IT);
 GPIO_Init(GPIOC, GPIO_PIN_4, GPIO_MODE_IN_PU_NO_IT);

 halt();

 // Re-enable ADC peripheral
 
}

void Inc500mSCounter(void)
{
 if (_500ms_tick < 500)
 {
 _500ms_tick++;
 }
 else
 {
 _500ms_tick = 0;
 idle_counter++;
 }
}