HAL库中HAL_PWR_EnterSLEEPMode(PWR_MAINREGUIATOR_ON,PWR_SLEEPRNTRY_WFE)功率没变化是什么原因

HAL_PWR_EnterSLEEPMode函数将设备置于睡眠模式，这会降低设备的功耗。在函数调用时，参数PWR_MAINREGUIATOR_ON指定主电源保持开启，而参数PWR_SLEEPRNTRY_WFE指定使用WFE指令进入睡眠模式。这两个参数本身并不会影响功耗的变化。

可能有以下几种原因导致功耗没有变化：

1. 设备本身的功耗本来就很低，进入睡眠模式后对功耗的影响并不明显。

2. 设备进入睡眠模式后，可能仍然有一些外部电路或组件在工作，这些电路或组件的功耗可能会影响整体功耗的变化。

3. 可能存在其他程序或中断在设备进入睡眠模式前就已经启动，这些程序或中断的影响可能会使设备的功耗没有明显变化。

如果想要进一步了解功耗的变化，可以使用功耗计或示波器等工具进行测量。

相关问题

请解释代码：int main(void) { /HW semaphore Clock enable/ __HAL_RCC_HSEM_CLK_ENABLE(); /* Activate HSEM notification for Cortex-M4*/ HAL_HSEM_ActivateNotification(__HAL_HSEM_SEMID_TO_MASK(HSEM_ID_0)); /* Domain D2 goes to STOP mode (Cortex-M4 in deep-sleep) waiting for Cortex-M7 to perform system initialization (system clock config, external memory configuration.. ) / HAL_PWREx_ClearPendingEvent(); HAL_PWREx_EnterSTOPMode(PWR_MAINREGULATOR_ON, PWR_STOPENTRY_WFE, PWR_D2_DOMAIN); / Clear HSEM flag / __HAL_HSEM_CLEAR_FLAG(__HAL_HSEM_SEMID_TO_MASK(HSEM_ID_0)); / STM32H7xx HAL library initialization: - Systick timer is configured by default as source of time base, but user can eventually implement his proper time base source (a general purpose timer for example or other time source), keeping in mind that Time base duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and handled in milliseconds basis. - Set NVIC Group Priority to 4 - Low Level Initialization / HAL_Init(); / Infinite loop */ while (1) { } }

这段代码是一个基本的STM32H7xx单片机的启动代码。下面是代码的详细解释：

1. `__HAL_RCC_HSEM_CLK_ENABLE();` 使能硬件信号量。

2. `HAL_HSEM_ActivateNotification(__HAL_HSEM_SEMID_TO_MASK(HSEM_ID_0));` 激活Cortex-M4的HSEM中断通知，等待Cortex-M7完成系统初始化。

3. `HAL_PWREx_ClearPendingEvent();` 清除电源管理模块的待处理事件。

4. `HAL_PWREx_EnterSTOPMode(PWR_MAINREGULATOR_ON, PWR_STOPENTRY_WFE, PWR_D2_DOMAIN);` 将域D2设置为STOP模式，使Cortex-M4进入深度睡眠状态，等待Cortex-M7完成系统初始化。

5. `__HAL_HSEM_CLEAR_FLAG(__HAL_HSEM_SEMID_TO_MASK(HSEM_ID_0));` 清除HSEM标志。

6. `HAL_Init();` 初始化STM32H7xx HAL库，包括将滴答定时器配置为默认的时间基准源，并将NVIC组优先级设置为4。

7. `while (1) { }` 无限循环，保持单片机处于运行状态。

int main(void) { /*HW semaphore Clock enable*/ __HAL_RCC_HSEM_CLK_ENABLE(); /* Activate HSEM notification for Cortex-M4*/ HAL_HSEM_ActivateNotification(__HAL_HSEM_SEMID_TO_MASK(HSEM_ID_0)); /* Domain D2 goes to STOP mode (Cortex-M4 in deep-sleep) waiting for Cortex-M7 to perform system initialization (system clock config, external memory configuration.. ) */ HAL_PWREx_ClearPendingEvent(); HAL_PWREx_EnterSTOPMode(PWR_MAINREGULATOR_ON, PWR_STOPENTRY_WFE, PWR_D2_DOMAIN); /* Clear HSEM flag */ __HAL_HSEM_CLEAR_FLAG(__HAL_HSEM_SEMID_TO_MASK(HSEM_ID_0)); /* STM32H7xx HAL library initialization: - Systick timer is configured by default as source of time base, but user can eventually implement his proper time base source (a general purpose timer for example or other time source), keeping in mind that Time base duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and handled in milliseconds basis. - Set NVIC Group Priority to 4 - Low Level Initialization */ HAL_Init(); /* Infinite loop */ while (1) { } }

This is a code snippet written in C programming language for an STM32H7 microcontroller.

The `__HAL_RCC_HSEM_CLK_ENABLE()` function enables the clock for the Hardware Semaphore (HSEM) module.

The `HAL_HSEM_ActivateNotification()` function activates the HSEM notification for the Cortex-M4 core.

The `HAL_PWREx_ClearPendingEvent()` function clears the pending event in the power management module.

The `HAL_PWREx_EnterSTOPMode()` function puts the Cortex-M4 core into the STOP mode with the main regulator ON, waiting for the Cortex-M7 core to perform system initialization.

The `__HAL_HSEM_CLEAR_FLAG()` function clears the HSEM flag.

The `HAL_Init()` function initializes the STM32H7xx HAL library.

The infinite loop at the end of the code keeps the microcontroller running indefinitely.