Cant enable low power run mode at STM32L1

[GMeiy.1]

Hi,

my STM32L151RC-A running at 65,536 khz with the MSI.

I´ve created the basic code with STMCubeMX.

i´ve tried to use this command to use the low power run mode:

HAL_PWREx_EnableLowPowerRunMode();

But this does nothing :\

Same power comsumption at 168µA (ST-Link is dissconnectet when i measure the Current.)

The standby mode works fine with a comsumption at 2µA.

Does anybody have an idea why i cant switch the low power run mode?

Main.c source:

/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           : main.c
  * @brief          : Main program body
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2021 STMicroelectronics.
  * All rights reserved.</center></h2>
  *
  * This software component is licensed by ST under BSD 3-Clause license,
  * the "License"; You may not use this file except in compliance with the
  * License. You may obtain a copy of the License at:
  *                        opensource.org/licenses/BSD-3-Clause
  *
  ******************************************************************************
  */
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
 
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
 
/* USER CODE END Includes */
 
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
 
/* USER CODE END PTD */
 
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */
 
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
 
/* USER CODE END PM */
 
/* Private variables ---------------------------------------------------------*/
 
/* USER CODE BEGIN PV */
 
/* USER CODE END PV */
 
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
/* USER CODE BEGIN PFP */
 
/* USER CODE END PFP */
 
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
 
/* USER CODE END 0 */
 
/**
  * @brief  The application entry point.
  * @retval int
  */
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();
  /* USER CODE BEGIN 2 */
 
 
	//HAL_SuspendTick();
	HAL_PWREx_EnableLowPowerRunMode();
 
  /* Enter LP RUN mode */
 
  /* Wait until the system enters LP RUN and the Regulator is in LP mode */
 
  while(__HAL_PWR_GET_FLAG(PWR_FLAG_REGLP) == RESET)
{
 
		HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_12); /*LED PORT 2*/
		HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_13); /*LED PORT 1*/
		HAL_Delay(50);
 
 
  }
 
	//enter_LPRun();
	//SET_BIT(PWR->CR, PWR_CR_LPSDSR);
	//SET_BIT(PWR->CR, PWR_CR_LPRUN);
 
  /* USER CODE END 2 */
 
  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
	  HAL_Delay(5000);
		HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_12); /*LED PORT 2*/
		HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_13); /*LED PORT 1*/
 
 
    /* USER CODE END WHILE */
 
    /* USER CODE BEGIN 3 */
  }
  /* USER CODE END 3 */
}
 
/**
  * @brief System Clock Configuration
  * @retval None
  */
void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
 
  /** Configure the main internal regulator output voltage
  */
  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE2);
  /** Initializes the RCC Oscillators according to the specified parameters
  * in the RCC_OscInitTypeDef structure.
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_MSI;
  RCC_OscInitStruct.MSIState = RCC_MSI_ON;
  RCC_OscInitStruct.MSICalibrationValue = 0;
  RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_0;
  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();
  }
}
 
/**
  * @brief GPIO Initialization Function
  * @param None
  * @retval None
  */
static void MX_GPIO_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};
 
  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOB_CLK_ENABLE();
 
  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOB, GPIO_PIN_12|GPIO_PIN_13, GPIO_PIN_RESET);
 
  /*Configure GPIO pins : PB12 PB13 */
  GPIO_InitStruct.Pin = GPIO_PIN_12|GPIO_PIN_13;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
 
}
 
/* USER CODE BEGIN 4 */
 
/* USER CODE END 4 */
 
/**
  * @brief  This function is executed in case of error occurrence.
  * @retval None
  */
void Error_Handler(void)
{
  /* USER CODE BEGIN Error_Handler_Debug */
  /* User can add his own implementation to report the HAL error return state */
  __disable_irq();
  while (1)
  {
  }
  /* USER CODE END Error_Handler_Debug */
}
 
#ifdef  USE_FULL_ASSERT
/**
  * @brief  Reports the name of the source file and the source line number
  *         where the assert_param error has occurred.
  * @param  file: pointer to the source file name
  * @param  line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t *file, uint32_t line)
{
  /* USER CODE BEGIN 6 */
  /* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */
 
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

[MM..1]

Maybe you need other code this is from example LPRUN

  while (1)
  {
    /*  Configure User push-button*/
    BSP_PB_Init(BUTTON_KEY,BUTTON_MODE_GPIO);
 
    /* Wait Until User push-button pressed */
    while(BSP_PB_GetState(BUTTON_KEY) != GPIO_PIN_RESET)
    {
    }
 
    /* Wait Until User push-button released */
    while(BSP_PB_GetState(BUTTON_KEY) != GPIO_PIN_SET)
    {
    }
 
    /* Enter LP RUN mode */
    HAL_PWREx_EnableLowPowerRunMode();
 
    /* Wait until the system enters LP RUN and the Regulator is in LP mode */
    while(__HAL_PWR_GET_FLAG(PWR_FLAG_REGLP) == RESET)
    {
    }
 
    /* Wait Until User push-button pressed */
    while(BSP_PB_GetState(BUTTON_KEY) != GPIO_PIN_RESET)
    {
    }
 
    /* Wait Until User push-button released */
    while(BSP_PB_GetState(BUTTON_KEY) != GPIO_PIN_SET)
    {
    }
 
    /* Exit LP RUN mode */
    HAL_PWREx_DisableLowPowerRunMode();
 
    /* Wait until the system exits LP RUN and the Regulator is in main mode */
    while(__HAL_PWR_GET_FLAG(PWR_FLAG_REGLP) != RESET)
    {
    }
  }

Remark this code is from L0 fw,