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) { } }、
时间: 2024-02-14 19:22:09 浏览: 207
这段代码是一个基于STM32H7xx的单片机系统初始化代码。在该代码中,首先开启了硬件信号量(HSEM)时钟,然后激活了HSEM通知,以便Cortex-M4进入深度睡眠模式等待Cortex-M7进行系统初始化。接着清除了待处理的事件,进入STOP模式并设置为D2域,等待Cortex-M7完成系统初始化。之后,清除了HSEM标志,并初始化了STM32H7xx HAL库,最后进入了一个无限循环。
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