【STM32L562 DK试用】低功耗模式

只看该作者 · 2025-3-8 11:34

本次体验L5的低功耗特性以及休眠唤醒的工作模式。

在相关软件中将系统时钟设置为110mhz。

void SystemClock_Config(void)

{

  RCC_OscInitTypeDef RCC_OscInitStruct = {0};

  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};



  /** Configure the main internal regulator output voltage

  */

  if (HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE0) != HAL_OK)

  {

    Error_Handler();

  }



  /** 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 = RCC_MSICALIBRATION_DEFAULT;

  RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_6;

  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;

  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_MSI;

  RCC_OscInitStruct.PLL.PLLM = 1;

  RCC_OscInitStruct.PLL.PLLN = 55;

  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV7;

  RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;

  RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;

  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_PLLCLK;

  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_5) != HAL_OK)

  {

    Error_Handler();

  }

}

EXTI线路通过PC.13连接到用户按钮并进行配置按下键时在下降沿上产生中断。

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int32_t BSP_PB_Init(Button_TypeDef Button, ButtonMode_TypeDef ButtonMode)

{

  int32_t               status = BSP_ERROR_NONE;

  GPIO_InitTypeDef      GPIO_Init;

  uint32_t              BSP_BUTTON_IT_PRIO[BUTTONn] = {BSP_BUTTON_USER_IT_PRIORITY};

  uint32_t              BUTTON_EXTI_LINE[BUTTONn]   = {BUTTON_USER_EXTI_LINE};

  BSP_EXTI_LineCallback ButtonCallback[BUTTONn]     = {BUTTON_USER_EXTI_Callback};



  /* Enable the BUTTON clock */

  BUTTON_USER_GPIO_CLK_ENABLE();



  GPIO_Init.Pin   = BUTTON_PIN[Button];

  GPIO_Init.Pull  = GPIO_NOPULL;

  GPIO_Init.Speed = GPIO_SPEED_FREQ_HIGH;



  if (ButtonMode == BUTTON_MODE_GPIO)

  {

    /* Configure Button pin as input */

    GPIO_Init.Mode = GPIO_MODE_INPUT;

    HAL_GPIO_Init(BUTTON_PORT[Button], &GPIO_Init);

  }



  if (ButtonMode == BUTTON_MODE_EXTI)

  {

    /* Configure Button pin as input with External interrupt */

    GPIO_Init.Mode = GPIO_MODE_IT_RISING;

    HAL_GPIO_Init(BUTTON_PORT[Button], &GPIO_Init);



    if (HAL_EXTI_GetHandle(&hpb_exti[Button], BUTTON_EXTI_LINE[Button]) == HAL_OK)

    {

      if (HAL_EXTI_RegisterCallback(&hpb_exti[Button], HAL_EXTI_RISING_CB_ID, ButtonCallback[Button]) == HAL_OK)

      {

        /* Enable and set Button EXTI Interrupt to the lowest priority */

        HAL_NVIC_SetPriority(BUTTON_IRQn[Button], BSP_BUTTON_IT_PRIO[Button], 0x00);

        HAL_NVIC_EnableIRQ(BUTTON_IRQn[Button]);

      }

      else

      {

        status = BSP_ERROR_PERIPH_FAILURE;

      }

    }

    else

    {

      status = BSP_ERROR_PERIPH_FAILURE;

    }

  }



  return status;

}

SysTick每1毫秒产生一个中断，LED10被切换以指示MCU是否处于SLEEP模式或RUN模式。

开机后5秒，系统自动进入SLEEP模式LED10停止切换。用户按钮可以在任何时候按下唤醒系统。然后软件回到运行模式5秒，然后再次自动进入睡眠模式。

复制

  while (1)

  {

    /* USER CODE END WHILE */



    /* USER CODE BEGIN 3 */

    /* Insert 5 seconds delay */

    HAL_Delay(5000);

        BSP_LED_Off(LED10);

    

    /*Suspend Tick increment to prevent wakeup by Systick interrupt. 

    Otherwise the Systick interrupt will wake up the device within 1ms (HAL time base)*/

    HAL_SuspendTick();



    /* Enter Sleep Mode , wake up is done once User push-button is pressed */

    HAL_PWR_EnterSLEEPMode(PWR_MAINREGULATOR_ON, PWR_SLEEPENTRY_WFI);



    /* Resume Tick interrupt if disabled prior to SLEEP mode entry */

    HAL_ResumeTick();

    

    /* Re-configure LED10 */

    BSP_LED_Init(LED10);

  }

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