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[STM32F4] STM32F4的RCC时钟配置

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 楼主| huahuagg 发表于 2017-12-15 17:32 | 显示全部楼层 |阅读模式
时钟配置, rc, STM32F4, ni, TI
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  1. /**
    

  2.   ******************************************************************************
    

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

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

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

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

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

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

  9.   ******************************************************************************
    

  10.   * @attention
    

  11.   *
    

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

  13.   *
    

  14.   * Redistribution and use in source and binary forms, with or without modification,
    

  15.   * are permitted provided that the following conditions are met:
    

  16.   *   1. Redistributions of source code must retain the above copyright notice,
    

  17.   *      this list of conditions and the following disclaimer.
    

  18.   *   2. Redistributions in binary form must reproduce the above copyright notice,
    

  19.   *      this list of conditions and the following disclaimer in the documentation
    

  20.   *      and/or other materials provided with the distribution.
    

  21.   *   3. Neither the name of STMicroelectronics nor the names of its contributors
    

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

  23.   *      without specific prior written permission.
    

  24.   *
    

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

  26.   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    

  27.   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
    

  28.   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
    

  29.   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
    

  30.   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
    

  31.   * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
    

  32.   * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
    

  33.   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
    

  34.   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    

  35.   *
    

  36.   ******************************************************************************
    

  37.   */
    


  38. 

  39. /* Includes ------------------------------------------------------------------*/
    

  40. #include "main.h"
    


  41. 

  42. /** @addtogroup STM32F4xx_HAL_Examples
    

  43.   * @{
    

  44.   */
    


  45. 

  46. /** @addtogroup RCC_ClockConfig
    

  47.   * @{
    

  48.   */ 
    


  49. 

  50. /* Private typedef -----------------------------------------------------------*/
    

  51. /* Private define ------------------------------------------------------------*/
    

  52. /* Private macro -------------------------------------------------------------*/
    

  53. /* Private variables ---------------------------------------------------------*/
    

  54. static RCC_ClkInitTypeDef RCC_ClkInitStruct;
    

  55. static RCC_OscInitTypeDef RCC_OscInitStruct;
    


  56. 

  57. /* Private function prototypes -----------------------------------------------*/
    

  58. static void SystemClockHSI_Config(void);
    

  59. static void SystemClockHSE_Config(void);
    

  60. static void Error_Handler(void);
    


  61. 

  62. /* Private functions ---------------------------------------------------------*/
    


  63. 

  64. /**
    

  65.   * @brief  Main program
    

  66.   * @param  None
    

  67.   * @retval None
    

  68.   */
    

  69. int main(void)
    

  70. {
    

  71.   /* STM32F4xx HAL library initialization:
    

  72.        - Configure the Flash prefetch, instruction and Data caches
    

  73.        - Configure the Systick to generate an interrupt each 1 msec
    

  74.        - Set NVIC Group Priority to 4
    

  75.        - Global MSP (MCU Support Package) initialization
    

  76.      */
    

  77.   HAL_Init();
    


  78. 

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

  80.   BSP_LED_Init(LED3);
    

  81.   BSP_LED_Init(LED4);
    

  82.   BSP_LED_Init(LED5);
    

  83.   BSP_LED_Init(LED6);
    

  84.   
    

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

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

  87.   BSP_PB_Init(BUTTON_KEY, BUTTON_MODE_EXTI);  
    


  88. 

  89.   /* Enable Power Control clock */
    

  90.   __HAL_RCC_PWR_CLK_ENABLE();
    


  91. 

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

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

  94.      regarding system frequency refer to product datasheet.  */
    

  95.   __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
    

  96.    
    

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

  98.      when using HSE oscillator as PLL clock source. */
    

  99.   RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
    

  100.   RCC_OscInitStruct.HSEState = RCC_HSE_ON;
    

  101.   RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
    

  102.   RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
    

  103.   RCC_OscInitStruct.PLL.PLLM = 8;
    

  104.   RCC_OscInitStruct.PLL.PLLN = 336;
    

  105.   RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
    

  106.   RCC_OscInitStruct.PLL.PLLQ = 7;
    

  107.   if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
    

  108.   {
    

  109.     /* Initialization Error */
    

  110.     Error_Handler();
    

  111.   }
    

  112.   
    

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

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

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

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

  117.   RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
    

  118.   RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
    

  119.   RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
    

  120.   RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;  
    

  121.   RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;  
    

  122.   if(HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK)
    

  123.   {
    

  124.     /* Initialization Error */
    

  125.     Error_Handler();
    

  126.   }
    


  127. 

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

  129.   if (HAL_GetREVID() == 0x1001)
    

  130.   {
    

  131.     /* Enable the Flash prefetch */
    

  132.     __HAL_FLASH_PREFETCH_BUFFER_ENABLE();
    

  133.   }
    


  134. 

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

  136.   HAL_RCC_MCOConfig(RCC_MCO2, RCC_MCO2SOURCE_SYSCLK, RCC_MCODIV_2);
    


  137. 

  138.   /* Toggle some LEDs in an infinite loop */  
    

  139.   while (1)
    

  140.   {
    

  141.    /* Toggle LED3 */
    

  142.     BSP_LED_Toggle(LED3);
    

  143.     HAL_Delay(100);
    

  144.     /* Toggle LED4 */
    

  145.     BSP_LED_Toggle(LED4);
    

  146.     HAL_Delay(100);
    

  147.     /* Toggle LED6 */
    

  148.     BSP_LED_Toggle(LED6);
    

  149.     HAL_Delay(100);
    

  150.   }
    

  151. }
    


  152. 

  153. /**
    

  154.   * @brief  EXTI line detection callbacks.
    

  155.   * @param  GPIO_Pin: Specifies the pins connected EXTI line
    

  156.   * @retval None
    

  157.   */
    

  158. void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
    

  159. {
    

  160.   if(GPIO_Pin == KEY_BUTTON_PIN)
    

  161.   {
    

  162.     if(__HAL_RCC_GET_PLL_OSCSOURCE() == RCC_PLLCFGR_PLLSRC_HSI) 
    

  163.     {
    

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

  165.       SystemClockHSE_Config();
    

  166.     }
    

  167.     else /*  PLL source is HSE oscillator */
    

  168.     {
    

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

  170.       SystemClockHSI_Config();
    

  171.     }
    

  172.   }
    

  173. }
    


  174. 

  175. /**
    

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

  177.   *         source.
    

  178.   *         The system Clock is configured as follow : 
    

  179.   *            System Clock source            = PLL (HSE)
    

  180.   *            SYSCLK(Hz)                     = 168000000
    

  181.   *            HCLK(Hz)                       = 168000000
    

  182.   *            AHB Prescaler                  = 1
    

  183.   *            APB1 Prescaler                 = 4
    

  184.   *            APB2 Prescaler                 = 2
    

  185.   *            HSE Frequency(Hz)              = 8000000
    

  186.   *            PLL_M                          = 8
    

  187.   *            PLL_N                          = 336
    

  188.   *            PLL_P                          = 2
    

  189.   *            PLL_Q                          = 7
    

  190.   *            VDD(V)                         = 3.3
    

  191.   *            Main regulator output voltage  = Scale1 mode
    

  192.   *            Flash Latency(WS)              = 5
    

  193.   * @param  None
    

  194.   * @retval None
    

  195.   */
    

  196. void SystemClockHSE_Config(void)
    

  197. {
    


  198. 

  199.   /* -1- Select HSI as system clock source to allow modification of the PLL configuration */
    

  200.   RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_SYSCLK;
    

  201.   RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
    

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

  203.   {
    

  204.     /* Initialization Error */
    

  205.     Error_Handler();
    

  206.   }
    

  207.   
    

  208.   /* -2- Enable HSE Oscillator, select it as PLL source and finally activate the PLL */
    

  209.   RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
    

  210.   RCC_OscInitStruct.HSEState = RCC_HSE_ON;
    

  211.   RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
    

  212.   RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
    

  213.   RCC_OscInitStruct.PLL.PLLM = 8;
    

  214.   RCC_OscInitStruct.PLL.PLLN = 336;
    

  215.   RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
    

  216.   RCC_OscInitStruct.PLL.PLLQ = 7;
    

  217.   if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
    

  218.   {
    

  219.     /* Initialization Error */
    

  220.     Error_Handler();
    

  221.   }
    

  222.   
    

  223.   /* -3- Select the PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers */
    

  224.   RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
    

  225.   RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
    

  226.   RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
    

  227.   RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;  
    

  228.   RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;  
    

  229.   if(HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK)
    

  230.   {
    

  231.     /* Initialization Error */
    

  232.     Error_Handler();
    

  233.   }
    

  234.   
    

  235.   /* -4- Optional: Disable HSI Oscillator (if the HSI is no more needed by the application)*/
    

  236.   RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
    

  237.   RCC_OscInitStruct.HSIState = RCC_HSI_OFF;
    

  238.   RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
    

  239.   if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
    

  240.   {
    

  241.     /* Initialization Error */
    

  242.     Error_Handler();
    

  243.   }
    

  244. }
    


  245. 

  246. /**
    

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

  248.   *         source.
    

  249.   *         The system Clock is configured as follow : 
    

  250.   *            System Clock source            = PLL (HSI)
    

  251.   *            SYSCLK(Hz)                     = 168000000
    

  252.   *            HCLK(Hz)                       = 168000000
    

  253.   *            AHB Prescaler                  = 1
    

  254.   *            APB1 Prescaler                 = 4
    

  255.   *            APB2 Prescaler                 = 2
    

  256.   *            HSI Frequency(Hz)              = 16000000
    

  257.   *            PLL_M                          = 16
    

  258.   *            PLL_N                          = 336
    

  259.   *            PLL_P                          = 2
    

  260.   *            VDD(V)                         = 3.3
    

  261.   *            Main regulator output voltage  = Scale1 mode
    

  262.   *            Flash Latency(WS)              = 5
    

  263.   * @param  None
    

  264.   * @retval None
    

  265.   */
    

  266. void SystemClockHSI_Config(void)
    

  267. {
    

  268.   /* -1- Select HSE as system clock source to allow modification of the PLL configuration */
    

  269.   RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_SYSCLK;
    

  270.   RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSE;
    

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

  272.   {
    

  273.     /* Initialization Error */
    

  274.     Error_Handler();
    

  275.   }
    


  276. 

  277.   /* -2- Enable HSI Oscillator, select it as PLL source and finally activate the PLL */
    

  278.   RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
    

  279.   RCC_OscInitStruct.HSIState = RCC_HSI_ON;
    

  280.   RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
    

  281.   RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
    

  282.   RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
    

  283.   RCC_OscInitStruct.PLL.PLLM = 16;
    

  284.   RCC_OscInitStruct.PLL.PLLN = 336;
    

  285.   RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
    

  286.   if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
    

  287.   {
    

  288.     /* Initialization Error */
    

  289.     Error_Handler();
    

  290.   }
    

  291.   
    

  292.   /* -3- Select the PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers */
    

  293.   RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
    

  294.   RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
    

  295.   RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
    

  296.   RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;  
    

  297.   RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;  
    

  298.   if(HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK)
    

  299.   {
    

  300.     /* Initialization Error */
    

  301.     Error_Handler();
    

  302.   }
    

  303.   
    

  304.   /* -4- Optional: Disable HSE Oscillator (if the HSE is no more needed by the application) */
    

  305.   RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
    

  306.   RCC_OscInitStruct.HSEState = RCC_HSE_OFF;
    

  307.   RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
    

  308.   if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
    

  309.   {
    

  310.     /* Initialization Error */
    

  311.     Error_Handler();
    

  312.   }
    

  313. }
    


  314. 

  315. /**
    

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

  317.   * @param  None
    

  318.   * @retval None
    

  319.   */
    

  320. static void Error_Handler(void)
    

  321. {
    

  322.   /* Turn LED5 on */
    

  323.   BSP_LED_On(LED5);
    

  324.   while(1)
    

  325.   {
    

  326.   }
    

  327. }
    


  328. 

  329. #ifdef  USE_FULL_ASSERT
    


  330. 

  331. /**
    

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

  333.   *         where the assert_param error has occurred.
    

  334.   * @param  file: pointer to the source file name
    

  335.   * @param  line: assert_param error line source number
    

  336.   * @retval None
    

  337.   */
    

  338. void assert_failed(uint8_t* file, uint32_t line)
    

  339. { 
    

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

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


  342. 

  343.   /* Infinite loop */
    

  344.   while (1)
    

  345.   {
    

  346.   }
    

  347. }
    

  348. #endif
    


  349. 

  350. /**
    

  351.   * @}
    

  352.   */ 
    


  353. 

  354. /**
    

  355.   * @}
    

  356.   */ 
    


  357. 

  358. /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/


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 楼主| huahuagg 发表于 2017-12-15 18:03 | 显示全部楼层
其实ST应该在例子中给出计算公式比较好
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xinpian101 发表于 2017-12-15 18:59 | 显示全部楼层
还是要看手册，虽然手册一千多页，不好看。。
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xinpian101 发表于 2017-12-15 19:02 | 显示全部楼层
这个还是用cubeF配置吧。
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稳稳の幸福 发表于 2017-12-15 20:28 | 显示全部楼层
还是用图形工具配置好，还是学好那个工具吧。
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