Stm32低功耗模式分为四种分别是运行模式、睡眠模式、停止模式、待机模式
其中运行模式就是我们平时正常工作时所使用的模式，就不做过多赘述。
睡眠模式进入方式使内核寄存器SLEEPDEEP=0，调用WFI（中断方式）或者WFE（事件方式）进入睡眠模式，SLEEPONEXIT=0,立即睡眠，SLEEPONEXIT=1,退出时睡眠，唤醒时无延迟，没有关闭外设,唤醒后执行中断模式，RAM并没有断电。
停止模式进入方式是内核寄存器SLEEPDEEP=1,PWR_CR寄存器PDDS=0，调用WFI或者WFE进入停止模式，其中；
PWR_CR寄存器LPDS=0，调压器正常
PWR_CR寄存器LPDS=1，低功耗模式
PWR_CR寄存器FPDS=0，Flash正常
PWR_CR寄存器FPDS=0，Flash掉电
睡眠时会关闭内核时钟、关闭外设时钟、但是保留运行数据，再次唤醒时会有延时首先需要唤醒外部时钟，flash恢复时间，唤醒执行完中断函数后会继续进行睡眠模式。
待机模式进入方式是内核寄存器SLEEPDEEP=1，PWR_CR寄存器PDDS=1，PWR_CR寄存器WUF=0，调用WFI或者WFE进入停止模式；使用WKUP上升沿、RTC闹钟、看门狗唤醒，
睡眠是会关闭内核、关闭外设、内存数据丢失，开启时相当于重新开机执行while函数。
在HAL函数库电源函数部分中中对各函数已经进行了定义
其中睡眠模式函数如下：
/**
* [url=home.php?mod=space&uid=159083]@brief[/url] Enter Sleep or Low-power Sleep mode.
* @note In Sleep/Low-power Sleep mode, all I/O pins keep the same state as in Run mode.
* @param Regulator: Specifies the regulator state in Sleep/Low-power Sleep mode.
* This parameter can be one of the following values:
* [url=home.php?mod=space&uid=1238002]@arg[/url] [url=home.php?mod=space&uid=1064992]@ref[/url] PWR_MAINREGULATOR_ON Sleep mode (regulator in main mode)
* @arg @ref PWR_LOWPOWERREGULATOR_ON Low-power Sleep mode (regulator in low-power mode)
* @note Low-power Sleep mode is entered from Low-power Run mode. Therefore, if not yet
* in Low-power Run mode before calling HAL_PWR_EnterSLEEPMode() with Regulator set
* to PWR_LOWPOWERREGULATOR_ON, the user can optionally configure the
* Flash in power-down monde in setting the SLEEP_PD bit in FLASH_ACR register.
* Additionally, the clock frequency must be reduced below 2 MHz.
* Setting SLEEP_PD in FLASH_ACR then appropriately reducing the clock frequency must
* be done before calling HAL_PWR_EnterSLEEPMode() API.
* @note When exiting Low-power Sleep mode, the MCU is in Low-power Run mode. To move in
* Run mode, the user must resort to HAL_PWREx_DisableLowPowerRunMode() API.
* @param SLEEPEntry: Specifies if Sleep mode is entered with WFI or WFE instruction.
* This parameter can be one of the following values:
* @arg @ref PWR_SLEEPENTRY_WFI enter Sleep or Low-power Sleep mode with WFI instruction
* @arg @ref PWR_SLEEPENTRY_WFE enter Sleep or Low-power Sleep mode with WFE instruction
* @note When WFI entry is used, tick interrupt have to be disabled if not desired as
* the interrupt wake up source.
* @retval None
*/
void HAL_PWR_EnterSLEEPMode(uint32_t Regulator, uint8_t SLEEPEntry)
{
/* Check the parameters */
assert_param(IS_PWR_REGULATOR(Regulator));
assert_param(IS_PWR_SLEEP_ENTRY(SLEEPEntry));
/* Set Regulator parameter */
if (Regulator == PWR_MAINREGULATOR_ON)
{
/* If in low-power run mode at this point, exit it */
if (HAL_IS_BIT_SET(PWR->SR2, PWR_SR2_REGLPF))
{
if (HAL_PWREx_DisableLowPowerRunMode() != HAL_OK)
{
return ;
}
}
/* Regulator now in main mode. */
}
else
{
/* If in run mode, first move to low-power run mode.
The system clock frequency must be below 2 MHz at this point. */
if (HAL_IS_BIT_SET(PWR->SR2, PWR_SR2_REGLPF) == RESET)
{
HAL_PWREx_EnableLowPowerRunMode();
}
}
/* Clear SLEEPDEEP bit of Cortex System Control Register */
CLEAR_BIT(SCB->SCR, ((uint32_t)SCB_SCR_SLEEPDEEP_Msk));
/* Select SLEEP mode entry -------------------------------------------------*/
if(SLEEPEntry == PWR_SLEEPENTRY_WFI)
{
/* Request Wait For Interrupt */
__WFI();
}
else
{
/* Request Wait For Event */
__SEV();
__WFE();
__WFE();
}
}
函数库对于各变量的定义都有严格的说明
在main函数中调用如下
//睡眠模式
printf("aaaa\r\n");//a可以打印完全
HAL_SuspendTick ();
HAL_PWR_EnterSLEEPMode(PWR_MAINREGULATOR_ON,PWR_SLEEPENTRY_WFI);//进入睡眠模式
printf ("aaa\r\n");//b也可以被打印
停止模式定义函数如下：
/**
* @brief Enter Stop mode
* @note This API is named HAL_PWR_EnterSTOPMode to ensure compatibility with legacy code running
* on devices where only "Stop mode" is mentioned with main or low power regulator ON.
* @note In Stop mode, all I/O pins keep the same state as in Run mode.
* @note All clocks in the VCORE domain are stopped; the PLL, the MSI,
* the HSI and the HSE oscillators are disabled. Some peripherals with the wakeup capability
* (I2Cx, USARTx and LPUART) can switch on the HSI to receive a frame, and switch off the HSI
* after receiving the frame if it is not a wakeup frame. In this case, the HSI clock is propagated
* only to the peripheral requesting it.
* SRAM1, SRAM2 and register contents are preserved.
* The BOR is available.
* The voltage regulator can be configured either in normal (Stop 0) or low-power mode (Stop 1).
* @note When exiting Stop 0 or Stop 1 mode by issuing an interrupt or a wakeup event,
* the HSI RC oscillator is selected as system clock if STOPWUCK bit in RCC_CFGR register
* is set; the MSI oscillator is selected if STOPWUCK is cleared.
* @note When the voltage regulator operates in low power mode (Stop 1), an additional
* startup delay is incurred when waking up.
* By keeping the internal regulator ON during Stop mode (Stop 0), the consumption
* is higher although the startup time is reduced.
* @param Regulator: Specifies the regulator state in Stop mode.
* This parameter can be one of the following values:
* @arg @ref PWR_MAINREGULATOR_ON Stop 0 mode (main regulator ON)
* @arg @ref PWR_LOWPOWERREGULATOR_ON Stop 1 mode (low power regulator ON)
* @param STOPEntry: Specifies Stop 0 or Stop 1 mode is entered with WFI or WFE instruction.
* This parameter can be one of the following values:
* @arg @ref PWR_STOPENTRY_WFI Enter Stop 0 or Stop 1 mode with WFI instruction.
* @arg @ref PWR_STOPENTRY_WFE Enter Stop 0 or Stop 1 mode with WFE instruction.
* @retval None
*/
void HAL_PWR_EnterSTOPMode(uint32_t Regulator, uint8_t STOPEntry)
{
/* Check the parameters */
assert_param(IS_PWR_REGULATOR(Regulator));
if(Regulator == PWR_LOWPOWERREGULATOR_ON)
{
HAL_PWREx_EnterSTOP1Mode(STOPEntry);
}
else
{
HAL_PWREx_EnterSTOP0Mode(STOPEntry);
}
}
在主函数中调用如下；
//停止模式对于唤醒时外部时钟设置
__HAL_RCC_HSE_CONFIG (RCC_HSE_ON );
__HAL_RCC_PLL_ENABLE ();
__HAL_RCC_SYSCLK_CONFIG (RCC_SYSCLKSOURCE_PLLCLK );
printf("aaaa\r\n");//不一定能打印完全可以增加延迟
HAL_PWR_EnterSTOPMode(PWR_MAINREGULATOR_ON,PWR_SLEEPENTRY_WFI );
printf ("aaa\r\n");//恢复时打印完全
其中分为两个部分写在while外是在唤醒停止模式时外部时钟的定义，在while里是进入和唤醒停止模式
待机模式函数如下：
/**
* @brief Enter Standby mode.
* @note In Standby mode, the PLL, the HSI, the MSI and the HSE oscillators are switched
* off. The voltage regulator is disabled, except when SRAM2 content is preserved
* in which case the regulator is in low-power mode.
* SRAM1 and register contents are lost except for registers in the Backup domain and
* Standby circuitry. SRAM2 content can be preserved if the bit RRS is set in PWR_CR3 register.
* To enable this feature, the user can resort to HAL_PWREx_EnableSRAM2ContentRetention() API
* to set RRS bit.
* The BOR is available.
* @note The I/Os can be configured either with a pull-up or pull-down or can be kept in analog state.
* HAL_PWREx_EnableGPIOPullUp() and HAL_PWREx_EnableGPIOPullDown() respectively enable Pull Up and
* Pull Down state, HAL_PWREx_DisableGPIOPullUp() and HAL_PWREx_DisableGPIOPullDown() disable the
* same.
* These states are effective in Standby mode only if APC bit is set through
* HAL_PWREx_EnablePullUpPullDownConfig() API.
* @retval None
*/
void HAL_PWR_EnterSTANDBYMode(void)
{
/* Set Stand-by mode */
MODIFY_REG(PWR->CR1, PWR_CR1_LPMS, PWR_CR1_LPMS_STANDBY);
/* Set SLEEPDEEP bit of Cortex System Control Register */
SET_BIT(SCB->SCR, ((uint32_t)SCB_SCR_SLEEPDEEP_Msk));
/* This option is used to ensure that store operations are completed */
#if defined ( __CC_ARM)
__force_stores();
#endif
/* Request Wait For Interrupt */
__WFI();
}
在while中使用待机模式代码如下
printf("aaaa\r\n");
HAL_PWR_EnableWakeUpPin (PWR_WAKEUP_PIN1_LOW);
__HAL_PWR_CLEAR_FLAG (PWR_FLAG_WU );
HAL_PWR_EnterSTANDBYMode();
printf("aaaa\r\n");//唤醒不执行
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