博客

1、使用STM32CubeMx打开HSE，注意不要选错了，否则后面会出现奇奇怪怪的问题。



2、配置时钟树



3、生成代码以后，找到时钟配置函数

void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

  /** Configure the main internal regulator output voltage 
  */
  __HAL_RCC_PWR_CLK_ENABLE();
  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
  /** Initializes the CPU, AHB and APB busses clocks 
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  RCC_OscInitStruct.PLL.PLLM = 4;
  RCC_OscInitStruct.PLL.PLLN = 168;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
  RCC_OscInitStruct.PLL.PLLQ = 4;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }
  /** Initializes the CPU, AHB and APB busses clocks 
  */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                              |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK)
  {
    Error_Handler();
  }
}

4、使用RT-Thread Studio新建工程以后，修改system_clock_config()函数，将原来的HSI的代码屏蔽掉，将上面使用STM32CubeMx生成的时钟配置函数体的内容复制到里面

void system_clock_config(int target_freq_mhz)
{
//    RCC_OscInitTypeDef RCC_OscInitStruct = { 0 };
//    RCC_ClkInitTypeDef RCC_ClkInitStruct = { 0 };
//
//    /** Configure the main internal regulator output voltage
//     */
//    __HAL_RCC_PWR_CLK_ENABLE();
//    __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
//    /** Initializes the CPU, AHB and APB busses clocks
//     */
//    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
//    RCC_OscInitStruct.HSIState = RCC_HSI_ON;
//    RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
//    RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
//    RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
//    RCC_OscInitStruct.PLL.PLLM = 8;
//    RCC_OscInitStruct.PLL.PLLN = target_freq_mhz;
//    RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
//    RCC_OscInitStruct.PLL.PLLQ = 4;
//    if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
//    {
//        Error_Handler();
//    }
//    /** Initializes the CPU, AHB and APB busses clocks
//     */
//    RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2;
//    RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
//    RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
//    RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
//    RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
//
//    if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK)
//    {
//        Error_Handler();
//    }

    RCC_OscInitTypeDef RCC_OscInitStruct = {0};
    RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

    /** Configure the main internal regulator output voltage
    */
    __HAL_RCC_PWR_CLK_ENABLE();
    __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
    /** Initializes the CPU, AHB and APB busses clocks
    */
    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
    RCC_OscInitStruct.HSEState = RCC_HSE_ON;
    RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
    RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
    RCC_OscInitStruct.PLL.PLLM = 4;
    RCC_OscInitStruct.PLL.PLLN = 168;
    RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
    RCC_OscInitStruct.PLL.PLLQ = 4;
    if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
    {
      Error_Handler();
    }
    /** Initializes the CPU, AHB and APB busses clocks
    */
    RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                                |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
    RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
    RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
    RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
    RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;

    if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK)
    {
      Error_Handler();
    }

}

5、修改stm32f4xx_hal_conf.h文件下的HSE_VALUE为自己板子上的时钟，我这里是8MHz


6、然后编译，下载就跑起来了。