STM32L1 Stop mode usage

[ughr1]

Hello, I have problem with entering to the stop mode again

Here is my function to configure stop mode, used once before main loop, and it's ok after that MCU goes to stop mode and power consumption is low.

void EnterLowPowerMode(void) { //used just once
	GPIO_InitTypeDef GPIO_InitStruct = {0};
	/*Configure GPIO pin : Backlight_Pin */
	GPIO_InitStruct.Pin = Backlight_Pin;
	GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
	GPIO_InitStruct.Pull = GPIO_NOPULL;
	HAL_GPIO_Init(Backlight_GPIO_Port, &GPIO_InitStruct);
	__HAL_RCC_GPIOC_CLK_DISABLE();
	__HAL_RCC_GPIOH_CLK_DISABLE();
	HAL_TIM_Base_Stop_IT(&htim3);
	HAL_RTCEx_SetWakeUpTimer_IT(&hrtc, 0xFFFF, RTC_WAKEUPCLOCK_RTCCLK_DIV16); //30s RTC timer
	__HAL_RCC_PWR_CLK_ENABLE(); // Enable Power Control clock
	HAL_PWREx_EnableUltraLowPower(); // Ultra low power mode
	HAL_PWREx_EnableFastWakeUp(); // Fast wake-up for ultra low power mode
	HAL_PWR_EnableSleepOnExit();		/* Re-enters SLEEP mode when an interruption handling is over */
	HAL_SuspendTick();      			/* To Avoid timer wake-up. */
	__HAL_PWR_CLEAR_FLAG(PWR_FLAG_WU);
	HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON,PWR_STOPENTRY_WFI);
	/* We are now waiting for TAMPERF1 or WAKEUP interrupts (or Reset) */
}

Using interrupt I quit from stop mode and it's ok MCU goes to run mode

HAL_PWR_DisableSleepOnExit();
SystemClock_Config();
HAL_ResumeTick();

After that I want again enter to stop mode, if I call EnterLowPowerMode(), MCU freeze.

If I use

HAL_PWR_EnableSleepOnExit();

MCU uses too much power as if it were not in stop mode (300uA)

[Mohamed Aymen HZAMI]

Hello @ughr1​ and welcome to the community 🙂

Can you please share with us your project to see what cause the problem of the over consumption ?

Mohamed Aymen.

[ughr1]

My code

int main(void)
{
  /* USER CODE BEGIN 1 */
 
  /* USER CODE END 1 */
 
  /* MCU Configuration--------------------------------------------------------*/
 
  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();
 
  /* USER CODE BEGIN Init */
 
  /* USER CODE END Init */
 
  /* Configure the system clock */
  SystemClock_Config();
 
  /* USER CODE BEGIN SysInit */
 
  /* USER CODE END SysInit */
 
  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_I2C1_Init();
  MX_USART2_UART_Init();
  MX_TIM2_Init();
  MX_TIM3_Init();
  MX_RTC_Init();
  EnterLowPowerMode();
  /* USER CODE END 2 */
 
  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
   while (1)
  {
    /* USER CODE END WHILE */
 
    /* USER CODE BEGIN 3 */
  }
}

void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
  RCC_PeriphCLKInitTypeDef PeriphClkInit = {0};
 
  /** Configure the main internal regulator output voltage
  */
  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
  /** Initializes the RCC Oscillators according to the specified parameters
  * in the RCC_OscInitTypeDef structure.
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI|RCC_OSCILLATORTYPE_MSI;
  RCC_OscInitStruct.LSIState = RCC_LSI_ON;
  RCC_OscInitStruct.MSIState = RCC_MSI_ON;
  RCC_OscInitStruct.MSICalibrationValue = 0;
  RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_5;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }
  /** Initializes the CPU, AHB and APB buses clocks
  */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                              |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_MSI;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
 
  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK)
  {
    Error_Handler();
  }
  PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_RTC;
  PeriphClkInit.RTCClockSelection = RCC_RTCCLKSOURCE_LSI;
  if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
  {
    Error_Handler();
  }
}

void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin){
	SystemClock_Config();
	HAL_ResumeTick();
	if(GPIO_Pin == SW1_Pin){
		activeInput=1;
		ExitLowPowerModeUsingSw();
	}
	else if(GPIO_Pin == SW2_Pin){
		activeInput=2;
		ExitLowPowerModeUsingSw();
	}
	else {
		__NOP ();
	}
}
 
void ExitLowPowerModeUsingSw(void) {
	MX_TIM3_Init();
	HAL_ResumeTick();      /* Needed in case of Timer usage. */
	HAL_TIM_Base_Start_IT(&htim3);
}
 
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim) {
	UNUSED(htim);
	if(htim->Instance == TIM3) {
		if(HAL_GPIO_ReadPin(SW1_GPIO_Port, SW1_Pin) == GPIO_PIN_RESET) {
			displayValue(activeInput,displayActive);
			HAL_TIM_Base_Stop_IT(&htim3);
			EnterLowPowerMode();
		}
		else if(HAL_GPIO_ReadPin(SW2_GPIO_Port, SW2_Pin) == GPIO_PIN_RESET) {
			displayValue(activeInput,displayActive);
			HAL_TIM_Base_Stop_IT(&htim3);
			EnterLowPowerMode();
	}
}

[Mohamed Aymen HZAMI]

Hello @ughr1​,

I will get back to you with my feedback as soon as possible.

Mohamed Aymen.

[ughr1]

simpler version of my code give this same result (MCU freeze after second enter to STOPMode current cosumption 200uA)

int main(void)
{
  /* USER CODE BEGIN 1 */
 
  /* USER CODE END 1 */
 
  /* MCU Configuration--------------------------------------------------------*/
 
  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();
 
  /* USER CODE BEGIN Init */
 
  /* USER CODE END Init */
 
  /* Configure the system clock */
  SystemClock_Config();
 
  /* USER CODE BEGIN SysInit */
 
  /* USER CODE END SysInit */
 
  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_I2C1_Init();
  MX_USART2_UART_Init();
  MX_TIM2_Init();
  MX_TIM3_Init();
  MX_RTC_Init();
  /* USER CODE BEGIN 2 */
  HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON,PWR_STOPENTRY_WFI);
  /* USER CODE END 2 */
 
  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
   while (1)
  {
    /* USER CODE END WHILE */
 
    /* USER CODE BEGIN 3 */
  }
  /* USER CODE END 3 */
}
 
void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin){
	HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON,PWR_STOPENTRY_WFI);
}

  /* EXTI interrupt init*/
  HAL_NVIC_SetPriority(EXTI0_IRQn, 0, 0);
  HAL_NVIC_EnableIRQ(EXTI0_IRQn);
 
  HAL_NVIC_SetPriority(EXTI1_IRQn, 0, 0);
  HAL_NVIC_EnableIRQ(EXTI1_IRQn);
 
  HAL_NVIC_SetPriority(EXTI4_IRQn, 0, 0);
  HAL_NVIC_EnableIRQ(EXTI4_IRQn);
 
  HAL_NVIC_SetPriority(EXTI15_10_IRQn, 0, 0);
  HAL_NVIC_EnableIRQ(EXTI15_10_IRQn);