STM32 M0系列单片机低功耗编程

关于STM32L系列单片机的低功耗实现

ST数据手册的介绍：
• Ultra-low-power platform
– 1.65 V to 3.6 V power supply
– - - 40 to 125 °C temperature range
– 0.29 µA Standby mode (3 wakeup pins)
– 0.43 µA Stop mode (16 wakeup lines)
– 0.86 µA Stop mode + RTC + 20 KB RAM
retention
– Down to 93 µA/MHz in Run mode
– 5 µs wakeup time (from Flash memory)
– 41 µA 12-bit ADC conversion at 10 ksps

1、初始化时钟配置：

  /* Configure the system clock to 2 MHz */
  SystemClock_Config();
  /* Enable Power Control clock */
  __HAL_RCC_PWR_CLK_ENABLE();

  /* The voltage scaling allows optimizing the power consumption when the device is 
     clocked below the maximum system frequency, to update the voltage scaling value 
     regarding system frequency refer to product datasheet.  */
  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE3);
  
  /* Disable Power Control clock */
  __HAL_RCC_PWR_CLK_DISABLE();

2、配置system Power

  /* Configure the system Power */
  SystemPower_Config();
    /* Enable Power Control clock */

3、使能超低功耗模式

  __HAL_RCC_PWR_CLK_ENABLE();

  /* Enable Ultra low power mode */
  HAL_PWREx_EnableUltraLowPower();

4、配置快速唤醒

  /* Enable the fast wake up from Ultra low power mode */
  HAL_PWREx_EnableFastWakeUp();

5、配置低功耗IO口

  /* Enable GPIOs clock */
  __HAL_RCC_GPIOA_CLK_ENABLE();
  __HAL_RCC_GPIOB_CLK_ENABLE();
  __HAL_RCC_GPIOC_CLK_ENABLE();
  __HAL_RCC_GPIOD_CLK_ENABLE();
  __HAL_RCC_GPIOH_CLK_ENABLE();
  __HAL_RCC_GPIOE_CLK_ENABLE();

  /* Configure all GPIO port pins in Analog Input mode (floating input trigger OFF) */
  /* Note: Debug using ST-Link is not possible during the execution of this   */
  /*       example because communication between ST-link and the device       */
  /*       under test is done through UART. All GPIO pins are disabled (set   */
  /*       to analog input mode) including  UART I/O pins.           */
  GPIO_InitStructure.Pin = GPIO_PIN_All;
  GPIO_InitStructure.Mode = GPIO_MODE_ANALOG;
  GPIO_InitStructure.Pull = GPIO_NOPULL;

  HAL_GPIO_Init(GPIOA, &GPIO_InitStructure); 
  HAL_GPIO_Init(GPIOB, &GPIO_InitStructure);
  HAL_GPIO_Init(GPIOC, &GPIO_InitStructure);
  HAL_GPIO_Init(GPIOD, &GPIO_InitStructure);
  HAL_GPIO_Init(GPIOH, &GPIO_InitStructure);
  HAL_GPIO_Init(GPIOE, &GPIO_InitStructure);

  /* Disable GPIOs clock */
  __HAL_RCC_GPIOA_CLK_DISABLE();
  __HAL_RCC_GPIOB_CLK_DISABLE();
  __HAL_RCC_GPIOC_CLK_DISABLE();
  __HAL_RCC_GPIOD_CLK_DISABLE();
  __HAL_RCC_GPIOH_CLK_DISABLE();
  __HAL_RCC_GPIOE_CLK_DISABLE();

6、进入Stop模式

  /* Enter Stop Mode */
    HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI);

配置完成运行进入低功耗模式。