STM32F4的RCC时钟配置

/**

  ******************************************************************************

  * [url=home.php?mod=space&uid=288409]@file[/url]    RCC/RCC_ClockConfig/Src/main.c 

  * [url=home.php?mod=space&uid=187600]@author[/url]  MCD Application Team

  * [url=home.php?mod=space&uid=895143]@version[/url] V1.2.6

  * [url=home.php?mod=space&uid=212281]@date[/url]    06-May-2016

  * [url=home.php?mod=space&uid=247401]@brief[/url]   This example describes how to use the RCC HAL API to configure the

  *          system clock (SYSCLK) and modify the clock settings on run time.

  ******************************************************************************

  * @attention

  *

  * <h2><center>© COPYRIGHT(c) 2016 STMicroelectronics</center></h2>

  *

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  *      may be used to endorse or promote products derived from this software

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  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

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/* Includes ------------------------------------------------------------------*/

#include "main.h"



/** @addtogroup STM32F4xx_HAL_Examples

  * @{

  */



/** @addtogroup RCC_ClockConfig

  * @{

  */ 



/* Private typedef -----------------------------------------------------------*/

/* Private define ------------------------------------------------------------*/

/* Private macro -------------------------------------------------------------*/

/* Private variables ---------------------------------------------------------*/

static RCC_ClkInitTypeDef RCC_ClkInitStruct;

static RCC_OscInitTypeDef RCC_OscInitStruct;



/* Private function prototypes -----------------------------------------------*/

static void SystemClockHSI_Config(void);

static void SystemClockHSE_Config(void);

static void Error_Handler(void);



/* Private functions ---------------------------------------------------------*/



/**

  * @brief  Main program

  * @param  None

  * @retval None

  */

int main(void)

{

  /* STM32F4xx HAL library initialization:

       - Configure the Flash prefetch, instruction and Data caches

       - Configure the Systick to generate an interrupt each 1 msec

       - Set NVIC Group Priority to 4

       - Global MSP (MCU Support Package) initialization

     */

  HAL_Init();



  /* Configure LED3, LED4, LED5 and LED6 */

  BSP_LED_Init(LED3);

  BSP_LED_Init(LED4);

  BSP_LED_Init(LED5);

  BSP_LED_Init(LED6);

  

  /* Configure USER Button, used to trigger an interrupt each time it's pressed.

     In the ISR the PLL source will be changed from HSE to HSI, and vice versa. */

  BSP_PB_Init(BUTTON_KEY, BUTTON_MODE_EXTI);  



  /* Enable Power Control clock */

  __HAL_RCC_PWR_CLK_ENABLE();



  /* The voltage scaling allows optimizing the power consumption when the device is 

     clocked below the maximum system frequency, to update the voltage scaling value 

     regarding system frequency refer to product datasheet.  */

  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);

   

  /* Enable HSE oscillator and configure the PLL to reach the max system frequency (168MHz)

     when using HSE oscillator as PLL clock source. */

  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 = 8;

  RCC_OscInitStruct.PLL.PLLN = 336;

  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;

  RCC_OscInitStruct.PLL.PLLQ = 7;

  if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)

  {

    /* Initialization Error */

    Error_Handler();

  }

  

  /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers.

     The SysTick 1 msec interrupt is required for the HAL process (Timeout management); by default

     the configuration is done using the HAL_Init() API, and when the system clock configuration

     is updated the SysTick configuration will be adjusted by the HAL_RCC_ClockConfig() API. */

  RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | 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)

  {

    /* Initialization Error */

    Error_Handler();

  }



  /* STM32F405x/407x/415x/417x Revision Z devices: prefetch is supported  */

  if (HAL_GetREVID() == 0x1001)

  {

    /* Enable the Flash prefetch */

    __HAL_FLASH_PREFETCH_BUFFER_ENABLE();

  }



  /* Output SYSCLK divided by 2 on MCO2 pin(PC9) */ 

  HAL_RCC_MCOConfig(RCC_MCO2, RCC_MCO2SOURCE_SYSCLK, RCC_MCODIV_2);



  /* Toggle some LEDs in an infinite loop */  

  while (1)

  {

   /* Toggle LED3 */

    BSP_LED_Toggle(LED3);

    HAL_Delay(100);

    /* Toggle LED4 */

    BSP_LED_Toggle(LED4);

    HAL_Delay(100);

    /* Toggle LED6 */

    BSP_LED_Toggle(LED6);

    HAL_Delay(100);

  }

}



/**

  * @brief  EXTI line detection callbacks.

  * @param  GPIO_Pin: Specifies the pins connected EXTI line

  * @retval None

  */

void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)

{

  if(GPIO_Pin == KEY_BUTTON_PIN)

  {

    if(__HAL_RCC_GET_PLL_OSCSOURCE() == RCC_PLLCFGR_PLLSRC_HSI) 

    {

      /* Set SYSCLK frequency to 168 MHz, coming from the PLL which is clocked by the HSE */

      SystemClockHSE_Config();

    }

    else /*  PLL source is HSE oscillator */

    {

      /* Set SYSCLK frequency to 168 MHz, coming from the PLL which is clocked by the HSI */

      SystemClockHSI_Config();

    }

  }

}



/**

  * @brief  Switch the PLL source from HSI to HSE, and select the PLL as SYSCLK

  *         source.

  *         The system Clock is configured as follow : 

  *            System Clock source            = PLL (HSE)

  *            SYSCLK(Hz)                     = 168000000

  *            HCLK(Hz)                       = 168000000

  *            AHB Prescaler                  = 1

  *            APB1 Prescaler                 = 4

  *            APB2 Prescaler                 = 2

  *            HSE Frequency(Hz)              = 8000000

  *            PLL_M                          = 8

  *            PLL_N                          = 336

  *            PLL_P                          = 2

  *            PLL_Q                          = 7

  *            VDD(V)                         = 3.3

  *            Main regulator output voltage  = Scale1 mode

  *            Flash Latency(WS)              = 5

  * @param  None

  * @retval None

  */

void SystemClockHSE_Config(void)

{



  /* -1- Select HSI as system clock source to allow modification of the PLL configuration */

  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_SYSCLK;

  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;

  if(HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK)

  {

    /* Initialization Error */

    Error_Handler();

  }

  

  /* -2- Enable HSE Oscillator, select it as PLL source and finally activate the PLL */

  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 = 8;

  RCC_OscInitStruct.PLL.PLLN = 336;

  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;

  RCC_OscInitStruct.PLL.PLLQ = 7;

  if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)

  {

    /* Initialization Error */

    Error_Handler();

  }

  

  /* -3- Select the PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers */

  RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | 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)

  {

    /* Initialization Error */

    Error_Handler();

  }

  

  /* -4- Optional: Disable HSI Oscillator (if the HSI is no more needed by the application)*/

  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;

  RCC_OscInitStruct.HSIState = RCC_HSI_OFF;

  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;

  if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)

  {

    /* Initialization Error */

    Error_Handler();

  }

}



/**

  * @brief  Switch the PLL source from HSI to HSE, and select the PLL as SYSCLK

  *         source.

  *         The system Clock is configured as follow : 

  *            System Clock source            = PLL (HSI)

  *            SYSCLK(Hz)                     = 168000000

  *            HCLK(Hz)                       = 168000000

  *            AHB Prescaler                  = 1

  *            APB1 Prescaler                 = 4

  *            APB2 Prescaler                 = 2

  *            HSI Frequency(Hz)              = 16000000

  *            PLL_M                          = 16

  *            PLL_N                          = 336

  *            PLL_P                          = 2

  *            VDD(V)                         = 3.3

  *            Main regulator output voltage  = Scale1 mode

  *            Flash Latency(WS)              = 5

  * @param  None

  * @retval None

  */

void SystemClockHSI_Config(void)

{

  /* -1- Select HSE as system clock source to allow modification of the PLL configuration */

  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_SYSCLK;

  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSE;

  if(HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK)

  {

    /* Initialization Error */

    Error_Handler();

  }



  /* -2- Enable HSI Oscillator, select it as PLL source and finally activate the PLL */

  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 = 16;

  RCC_OscInitStruct.PLL.PLLN = 336;

  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;

  if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)

  {

    /* Initialization Error */

    Error_Handler();

  }

  

  /* -3- Select the PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers */

  RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | 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)

  {

    /* Initialization Error */

    Error_Handler();

  }

  

  /* -4- Optional: Disable HSE Oscillator (if the HSE is no more needed by the application) */

  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;

  RCC_OscInitStruct.HSEState = RCC_HSE_OFF;

  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;

  if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)

  {

    /* Initialization Error */

    Error_Handler();

  }

}



/**

  * @brief  This function is executed in case of error occurrence.

  * @param  None

  * @retval None

  */

static void Error_Handler(void)

{

  /* Turn LED5 on */

  BSP_LED_On(LED5);

  while(1)

  {

  }

}



#ifdef  USE_FULL_ASSERT



/**

  * @brief  Reports the name of the source file and the source line number

  *         where the assert_param error has occurred.

  * @param  file: pointer to the source file name

  * @param  line: assert_param error line source number

  * @retval None

  */

void assert_failed(uint8_t* file, uint32_t line)

{ 

  /* User can add his own implementation to report the file name and line number,

     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */



  /* Infinite loop */

  while (1)

  {

  }

}

#endif



/**

  * @}

  */ 



/**

  * @}

  */ 



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