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我在LPBAM停止函数后调用时钟重新初始化函数(此函数和CUBEMX生成的SystemClock_Config()函数一致，仅仅只是重新写了一遍而已)，通过串口输出MSIS和MSIK的寄存器值(通过调用HAL_RCC_GET_MSI_RANGE()和HAL_RCC_GET_MSIK_RANGE()宏)，发现在时钟重新初始化函数执行完后，仅MSIS寄存器值正确(1MHz)，MSIK寄存器值为0(对应是48MHz)，导致部分使用MSIK时钟的外设运行异常！ /** - @brief 系统时钟配置(MSIS和MSIK)
- @param clockFlag : 系统时钟配置标志 @ref sys_api_clock_flag
- @ARG SYS_API_CLOCK_1M : 1MHz
- @arg SYS_API_CLOCK_2M : 2MHz
- @arg SYS_API_CLOCK_4M : 4MHz
- @arg SYS_API_CLOCK_12M : 12MHz
- @arg SYS_API_CLOCK_16M : 16MHz
- @arg SYS_API_CLOCK_24M : 24MHz
- @retval None
*/ void sys_api_system_clock_config(uint8_t clockFlag) { uint32_t clockRange; RCC_OscInitTypeDef RCC_OscInitStruct = {0}; RCC_ClkInitTypeDef RCC_ClkInitStruct = {0}; switch(clockFlag) { case SYS_API_CLOCK_1M: clockRange = RCC_MSIRANGE_7; break;case SYS_API_CLOCK_2M: clockRange = RCC_MSIRANGE_5; break;case SYS_API_CLOCK_4M: clockRange = RCC_MSIRANGE_4; break;case SYS_API_CLOCK_12M: clockRange = RCC_MSIRANGE_3; break;case SYS_API_CLOCK_16M: clockRange = RCC_MSIRANGE_2; break;case SYS_API_CLOCK_24M: clockRange = RCC_MSIRANGE_1; break;default: clockRange = RCC_MSIRANGE_7; break;} /** Configure the main internal regulator output voltage */ if(HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE4) != HAL_OK) { Error_Handler();} /** Initializes the CPU, AHB and APB buses clocks */ RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI|RCC_OSCILLATORTYPE_MSI|RCC_OSCILLATORTYPE_MSIK; RCC_OscInitStruct.LSIState = RCC_LSI_ON; RCC_OscInitStruct.MSIState = RCC_MSI_ON; RCC_OscInitStruct.MSICalibrationValue = RCC_MSICALIBRATION_DEFAULT; RCC_OscInitStruct.MSIClockRange = clockRange; RCC_OscInitStruct.LSIDiv = RCC_LSI_DIV1; RCC_OscInitStruct.MSIKClockRange = clockRange; RCC_OscInitStruct.MSIKState = RCC_MSIK_ON; RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; 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_CLOCKTYPE_PCLK3; RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_MSI; RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1; RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1; RCC_ClkInitStruct.APB3CLKDivider = RCC_HCLK_DIV1; if(HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK) { Error_Handler();} sys_api_clock_get(); }
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