stm32c011f6p6

[meena]

I needed a help how to implement shutdown mode and wakeup from external reset in my application

 while (1)
  {
	  HAL_Delay(100);
	  	  //  MAINS INPUT
	  	  	  Adc_Mains();
	  	  	  HAL_ADC_Start(&hadc1);
	  	  	  HAL_ADC_PollForConversion(&hadc1,1000);
	  	  	  Mains=HAL_ADC_GetValue(&hadc1);
	  	  	  Hands=Hands*2/4095;
	  	  	  HAL_ADC_Stop(&hadc1);
	           HAL_Delay(100);

	       //Battery operation
	           Adc_Vbat();
	            HAL_ADC_Start(&hadc1);
	            HAL_ADC_PollForConversion(&hadc1,1000);
	            Vbat=HAL_ADC_GetValue(&hadc1);
	            Vbat=Vbat*2/4095;
	            HAL_ADC_Stop(&hadc1);
	            HAL_Delay(100);

	       //OPEN CIRCUIT DETECT
	        Adc_OCD();
	  	  	HAL_ADC_Start(&hadc1);
	  	    HAL_ADC_PollForConversion(&hadc1,1000);
	  	    OCD=HAL_ADC_GetValue(&hadc1);
	  	    OCD=OCD*2/4095;
	  	    HAL_ADC_Stop(&hadc1);
	  	    HAL_Delay(100);
	  	  //BATTERY TEMPARATURE
	  	    		Adc_Temp();
	  	  	  	  	HAL_ADC_Start(&hadc1);
	  	  	  	    HAL_ADC_PollForConversion(&hadc1,1000);
	  	  	  	    Temp=HAL_ADC_GetValue(&hadc1);
	  	  	  	    Temp=Temp*2/4095;
	  	  	  	    HAL_ADC_Stop(&hadc1);
	  	  	  	    HAL_Delay(100);

	  	  	  	// Check mains and mains fail

	  	  	  	if(Mains>0.1)
	  	  	  	{
	  	  	  		   if((Mains<1) &&(Vbat>0.9))
	  	  	  		   	   {
	  	  	  			   	   En_Emergency(1);
	  	  	  			   	Set_LED(0);

	  	  	  		   	   }

	  	  	  		   else
	  	  	  		   	   {
	  	  	  			   En_Emergency(0);
	  	  	  		   	   }

	  	  	  	}
	  	  	if(Mains<1)
	  	  	{
	  	  		 // OCD=HAL_ADC_GetValue(&hadc1);
	  	  		  if(OCD>0.3||OCD<0.6)
	  	  		  {

	  	  			Set_LED(0);

	  	  		  }
	  	  		  else if(OCD<0.3 || OCD>0.6)
	  	  			{

	  	  		Double_Flash();
	  	  			}
	  	  	 }

	  	  	//   MAINS ON
	  	  	if(Mains>1.2)
	  	  	{
	  	  		if(Vbat>1.5 || Vbat<0.5)     //OPEN CIRCUIT OR ZERO BATT LEVEL
	  	  				{
	  	  				Set_LED(0);
	  	  				Batt_Charge(1);
	  	  				}
	  	  		else if(Vbat <0.94 )     // START CHARGING LEVEL
	  	  				{
	  	  				Set_LED(1);
	  	  				Batt_Charge(1);
	  	  				}
	  	  		else if(Vbat >0.98 )   // STOP CHARGING LEVEL
	  	  				{
	  	  				Set_LED(1);
	  	  				Batt_Charge(0);

	  	  				}
	  	  		//BATTERY TEMPARATURE CHECK

	  	  	 if(Temp<0.17  || Temp>0.83)
	  	  	 {
	  	  		Batt_Charge(0);
	  	  		Triple_Flash();
	  	  	 }
	  	  	 else if((Temp>0.17  || Temp<0.83))
	  	  	 {
	  	  		Batt_Charge(1);

	  	  	 }
	  	  	}

.if my mains is off for 30 seconds it should be in shutdown mode.I have a option using wakeup4 pin but my config is not working.Can anyone pls give an idea for the implementation 

[Sarra.S · Accepted solution]

Hello @meena, 

Configure wkup4 pin as EXTI and connect it to an external interrupt source (ex: button or sensor) 

after enabling the wakeup, test if mains off (exp: mains<0.1)

 if (Mains < 0.1) {
    HAL_Delay(30000); // Wait for 30 seconds
    if (Mains < 0.1) {
      // Mains is still off, enter shutdown mode
      HAL_PWR_EnterShutdownMode();
    }

[meena]

hi thanks for the reply I have this but this is entirely making my module shutdown its not waiting for 30 seconds

[meena]

hi this worked thank you so much 

if (Mains < 0.1) {
    HAL_Delay(30000); // Wait for 30 seconds
    if (Mains < 0.1) {
      // Mains is still off, enter shutdown mode
      HAL_PWREx_EnterSHUTDOWNMode();
    }

[Sarra.S]

Hello @meena, 

yes right the HAL_Delay() will block your code,  instead, the best approach is to use a timer that interrupts every 1s for example, in its callback, you read the value of mains for a period of 30s, once it reaches 30s, you set a flag, in while(1) loop you test on that flag and enter shutdown accordingly 

Is that somehow clear?

[meena]

hi I am trying to code it in a way ,but standby mode is working its not waking up as in my previous post but I have to the below one now its not going to standby mode .I couldnt find whats wrong

    __HAL_RCC_PWR_CLK_ENABLE();
    /* Check if the system was resumed from Standby mode */
    if (__HAL_PWR_GET_FLAG(PWR_FLAG_SB) != RESET)
    {
      /* Clear Standby flag */
      __HAL_PWR_CLEAR_FLAG(PWR_FLAG_SB);
      /* Check and Clear the Wakeup flag */
      if (__HAL_PWR_GET_FLAG(PWR_FLAG_WUF4) != RESET)
      {
        __HAL_PWR_CLEAR_FLAG(PWR_FLAG_WUF4);
      }
    }

    //HAL_Delay(5000);

    count++;
    if(count>=30)
    {
    	  HAL_PWR_EnterSTANDBYMode();
    }

    HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN4_HIGH);

[Piranha]

	  	  	 if(Temp<0.17  || Temp>0.83)
	  	  	 {
	  	  		Batt_Charge(0);
	  	  		Triple_Flash();
	  	  	 }
	  	  	 else if((Temp>0.17  || Temp<0.83))
	  	  	 {
	  	  		Batt_Charge(1);

	  	  	 }

1. The second if condition should use && logical operator.
2. The code will do nothing if the Temp is exactly 0.17 or 0.83. One of the if conditions should use >= and <= comparison operators.
3. The second if condition is useless, because a simple else does what is necessary.
4. The 0.17 and 0.83 constants are of a double (64-bit) type, not float (32-bit). Use the suffix f like 0.17f and 0.83f.

[meena]

thank you,Could you have any solution for exiting low power modes using wakeup pins

[Piranha]

https://community.st.com/t5/stm32-mcu-products/how-to-enter-standby-or-shutdown-mode-on-stm32/m-p/145849