STM32L1 geht nicht in den low power Modus

[Gerhard G (Gast)]

Hallo,

ich hab das Problem das der Microcontroller sich nicht auf den low power 
Regulator wechseln will.

Ich hab mit CubeMX das Grundgerüst erstellt, CPU läuft auf über den MSI 
mit 65,536 Khz.

Ich hab dem grundgerüst nichts weiter zugefügt ausser die verschiedenen 
versuche in den low power run modus zu schalten.

Weder das hier bringt was:

HAL_PWREx_EnableLowPowerRunMode();

Noch das hier:

  void enter_LPRun( void ){

      /* 1. Each digital IP clock must be enabled or disabled by using the
                     RCC_APBxENR and RCC_AHBENR registers */
      RCC->APB1ENR |= RCC_APB1ENR_PWREN;
      /* 2. The frequency of the system clock must be decreased to not exceed the
            frequency of f_MSI range1. */
      /* 3. The regulator is forced in low-power mode by software
            (LPRUN and LPSDSR bits set ) */
      PWR->CR &= ~PWR_CR_LPRUN; // Be sure LPRUN is cleared!

      PWR->CR |= PWR_CR_LPSDSR; // must be set before LPRUN
      PWR->CR |= PWR_CR_LPRUN; // enter low power run mode
  }

Der Stromverbrauch liegt bei 168µA und ändert sich nicht.
(gemessen immer mit abgestöpseltem ST-Link)
Laut Datenblatt sollen ja bis zu 11 μA im Low-power run mode möglich 
sein.

Der STANDBY Mode dagegen funktioniert wunderbar, der Stromverbrauch der 
gesamten Schaltung liegt dann bei um die 2µA.

Kann mir einer sagen was ich da falsch mache oder falsch denke?

Hier nochmal der gesamte Code:

/* 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);
/* 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 */
  /* USER CODE BEGIN 2 */
  void enter_LPRun( void ){

      /* 1. Each digital IP clock must be enabled or disabled by using the
                     RCC_APBxENR and RCC_AHBENR registers */
      RCC->APB1ENR |= RCC_APB1ENR_PWREN;
      /* 2. The frequency of the system clock must be decreased to not exceed the
            frequency of f_MSI range1. */
      /* 3. The regulator is forced in low-power mode by software
            (LPRUN and LPSDSR bits set ) */
      PWR->CR &= ~PWR_CR_LPRUN; // Be sure LPRUN is cleared!

      PWR->CR |= PWR_CR_LPSDSR; // must be set before LPRUN
      PWR->CR |= PWR_CR_LPRUN; // enter low power run mode
  }


  //HAL_SuspendTick();
  //HAL_PWREx_EnableLowPowerRunMode();
  //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)
  {
    /* 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_SCALE3);
  /** 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();
  }
}

/* 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****/

[reminder (Gast)]

F*ck!

Lesen, verinnerlichen und umsetzen!

[Johannes S. (Gast)]

da würde mal dieses Beispiel probieren:
https://github.com/STMicroelectronics/STM32CubeL1/tree/master/Projects/NUCLEO-L152RE/Examples/PWR/PWR_LPRUN

Im wesentlichen wird wohl auch EnableLowPowerRun aufgerufen.