system_stm32f10x.c

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    FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_0;    
 
    /*!< HCLK = SYSCLK */
    RCC->CFGR |= (uint32_t)RCC_CFGR_HPRE_DIV1;
      
    /*!< PCLK2 = HCLK */
    RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE2_DIV1;
    
    /*!< PCLK1 = HCLK */
    RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE1_DIV1;
    
    /*!< PLLCLK = (8MHz / 2) * 5 = 20 MHz */
    RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_PLLSRC | RCC_CFGR_PLLXTPRE | RCC_CFGR_PLLMULL));
    RCC->CFGR |= (uint32_t)(RCC_CFGR_PLLSRC | RCC_CFGR_PLLXTPRE | RCC_CFGR_PLLMULL5);

    /*!< 使能 PLL */
    RCC->CR |= RCC_CR_PLLON;

    /*!< 等待 PLL 准备好 */
    while((RCC->CR & RCC_CR_PLLRDY) == 0)
    {
    }

    /*!< 选择 PLL 作为系统时钟源 */
    RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_SW));
    RCC->CFGR |= (uint32_t)RCC_CFGR_SW_PLL;    

    /*!< 等待 PLL 作为系统时钟源 */
    while ((RCC->CFGR & (uint32_t)RCC_CFGR_SWS) != (uint32_t)0x08)
    {
    }
  }
  else
  { /*!< 如果 HSE 启动失败, 申报为错误时钟. 用户可以再次添加代码处理这个错误 */    

    /*!< 执行无限循环 */
    while (1)
    {
    }
  } 
}
#elif defined SYSCLK_FREQ_36MHz
/**
  * @简述   设置系统时钟为 36MHz ，配置 HCLK, PCLK2, PCLK1 
  * @参数   没有.
  * @自变量 没有.
  * @注解 : 这个功能也许仅仅在复位之后起作用.
  * @retval value: None.
  */
static void SetSysClockTo36(void)
{
  __IO uint32_t StartUpCounter = 0, HSEStatus = 0;
  
  /*!< SYSCLK, HCLK, PCLK2 and PCLK1 configuration ---------------------------*/    
  /*!< Enable HSE */    
  RCC->CR |= ((uint32_t)RCC_CR_HSEON);
 
  /*!< Wait till HSE is ready and if Time out is reached exit */
  do
  {
    HSEStatus = RCC->CR & RCC_CR_HSERDY;
    StartUpCounter++;  
  } while((HSEStatus == 0) && (StartUpCounter != HSEStartUp_TimeOut));

  if ((RCC->CR & RCC_CR_HSERDY) != RESET)
  {
    HSEStatus = (uint32_t)0x01;
  }
  else
  {
    HSEStatus = (uint32_t)0x00;
  }  

  if (HSEStatus == (uint32_t)0x01)
  {
    /*!< Enable Prefetch Buffer */
    FLASH->ACR |= FLASH_ACR_PRFTBE;

    /*!< Flash 1 wait state */
    FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_1;    
 
    /*!< HCLK = SYSCLK */
    RCC->CFGR |= (uint32_t)RCC_CFGR_HPRE_DIV1;
      
    /*!< PCLK2 = HCLK */
    RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE2_DIV1;
    
    /*!< PCLK1 = HCLK */
    RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE1_DIV1;
    
    /*!< PLLCLK = (8MHz / 2) * 9 = 36 MHz */
    RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_PLLSRC | RCC_CFGR_PLLXTPRE | RCC_CFGR_PLLMULL));
    RCC->CFGR |= (uint32_t)(RCC_CFGR_PLLSRC | RCC_CFGR_PLLXTPRE | RCC_CFGR_PLLMULL9);

    /*!< Enable PLL */
    RCC->CR |= RCC_CR_PLLON;

    /*!< Wait till PLL is ready */
    while((RCC->CR & RCC_CR_PLLRDY) == 0)
    {
    }

    /*!< Select PLL as system clock source */
    RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_SW));
    RCC->CFGR |= (uint32_t)RCC_CFGR_SW_PLL;    

    /*!< Wait till PLL is used as system clock source */
    while ((RCC->CFGR & (uint32_t)RCC_CFGR_SWS) != (uint32_t)0x08)
    {
    }
  }
  else
  { /*!< 如果 HSE 启动失败, 申报为错误时钟. 用户可以再次添加代码处理这个错误 */    

    /*!< 执行无限循环 */
    while (1)
    {
    }
  } 
}
#elif defined SYSCLK_FREQ_48MHz
/**
  * @简述   设置系统时钟为 48MHz ，配置 HCLK, PCLK2, PCLK1 
  * @参数   没有.
  * @自变量 没有.
  * @注解 : 这个功能也许仅仅在复位之后起作用.
  * @retval value: None.
  */
static void SetSysClockTo48(void)
{
  __IO uint32_t StartUpCounter = 0, HSEStatus = 0;
  
  /*!< SYSCLK, HCLK, PCLK2 and PCLK1 configuration ---------------------------*/    
  /*!< Enable HSE */    
  RCC->CR |= ((uint32_t)RCC_CR_HSEON);
 
  /*!< Wait till HSE is ready and if Time out is reached exit */
  do
  {
    HSEStatus = RCC->CR & RCC_CR_HSERDY;
    StartUpCounter++;  
  } while((HSEStatus == 0) && (StartUpCounter != HSEStartUp_TimeOut));

  if ((RCC->CR & RCC_CR_HSERDY) != RESET)
  {
    HSEStatus = (uint32_t)0x01;
  }
  else
  {
    HSEStatus = (uint32_t)0x00;
  }  

  if (HSEStatus == (uint32_t)0x01)
  {
    /*!< Enable Prefetch Buffer */
    FLASH->ACR |= FLASH_ACR_PRFTBE;

    /*!< Flash 1 wait state */
    FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_1;    
 
    /*!< HCLK = SYSCLK */
    RCC->CFGR |= (uint32_t)RCC_CFGR_HPRE_DIV1;
      
    /*!< PCLK2 = HCLK */
    RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE2_DIV1;
    
    /*!< PCLK1 = HCLK */
    RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE1_DIV2;
    
    /*!< PLLCLK = 8MHz * 6 = 48 MHz */
    RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_PLLSRC | RCC_CFGR_PLLXTPRE | RCC_CFGR_PLLMULL));
    RCC->CFGR |= (uint32_t)(RCC_CFGR_PLLSRC | RCC_CFGR_PLLMULL6);

    /*!< Enable PLL */
    RCC->CR |= RCC_CR_PLLON;

    /*!< Wait till PLL is ready */
    while((RCC->CR & RCC_CR_PLLRDY) == 0)
    {
    }

    /*!< Select PLL as system clock source */
    RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_SW));
    RCC->CFGR |= (uint32_t)RCC_CFGR_SW_PLL;    

    /*!< Wait till PLL is used as system clock source */
    while ((RCC->CFGR & (uint32_t)RCC_CFGR_SWS) != (uint32_t)0x08)
    {
    }
  }
  else
  { /*!< If HSE fails to start-up, the application will have wrong clock 
         configuration. User can add here some code to deal with this error */    

    /*!< Go to infinite loop */
    while (1)
    {
    }
  } 
}

#elif defined SYSCLK_FREQ_56MHz
/**
  * @简述   设置系统时钟为 56MHz ，配置 HCLK, PCLK2, PCLK1 
  * @参数   没有.
  * @自变量 没有.
  * @注解 : 这个功能也许仅仅在复位之后起作用.
  * @retval value: None.
  */
static void SetSysClockTo56(void)
{
  __IO uint32_t StartUpCounter = 0, HSEStatus = 0;
  
  /*!< SYSCLK, HCLK, PCLK2 and PCLK1 configuration ---------------------------*/   
  /*!< Enable HSE */    
  RCC->CR |= ((uint32_t)RCC_CR_HSEON);
 
  /*!< Wait till HSE is ready and if Time out is reached exit */
  do
  {
    HSEStatus = RCC->CR & RCC_CR_HSERDY;
    StartUpCounter++;  
  } while((HSEStatus == 0) && (StartUpCounter != HSEStartUp_TimeOut));

  if ((RCC->CR & RCC_CR_HSERDY) != RESET)
  {
    HSEStatus = (uint32_t)0x01;
  }
  else
  {
    HSEStatus = (uint32_t)0x00;
  }  

  if (HSEStatus == (uint32_t)0x01)
  {
    /*!< Enable Prefetch Buffer */
    FLASH->ACR |= FLASH_ACR_PRFTBE;

    /*!< Flash 1 wait state */
    FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_1;    
 
    /*!< HCLK = SYSCLK */
    RCC->CFGR |= (uint32_t)RCC_CFGR_HPRE_DIV1;
      
    /*!< PCLK2 = HCLK */
    RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE2_DIV1;
    
    /*!< PCLK1 = HCLK */
    RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE1_DIV2;
    
    /*!< PLLCLK = 8MHz * 7 = 56 MHz */
    RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_PLLSRC | RCC_CFGR_PLLXTPRE | RCC_CFGR_PLLMULL));
    RCC->CFGR |= (uint32_t)(RCC_CFGR_PLLSRC | RCC_CFGR_PLLMULL7);

    /*!< Enable PLL */
    RCC->CR |= RCC_CR_PLLON;

    /*!< Wait till PLL is ready */
    while((RCC->CR & RCC_CR_PLLRDY) == 0)
    {
    }

    /*!< Select PLL as system clock source */
    RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_SW));
    RCC->CFGR |= (uint32_t)RCC_CFGR_SW_PLL;    

    /*!< Wait till PLL is used as system clock source */
    while ((RCC->CFGR & (uint32_t)RCC_CFGR_SWS) != (uint32_t)0x08)
    {
    }
  }
  else
  { /*!< If HSE fails to start-up, the application will have wrong clock 
         configuration. User can add here some code to deal with this error */    

    /*!< Go to infinite loop */
    while (1)
    {
    }
  } 
}

#elif defined SYSCLK_FREQ_72MHz
/**
  * @简述   设置系统时钟为 72MHz ，配置 HCLK, PCLK2, PCLK1 
  * @参数   没有.
  * @自变量 没有.
  * @注解 : 这个功能也许仅仅在复位之后起作用.
  * @retval value: None.
  */
static void SetSysClockTo72(void)
{
  __IO uint32_t StartUpCounter = 0, HSEStatus = 0;
  
  /*!< SYSCLK, HCLK, PCLK2 and PCLK1 configuration ---------------------------*/    
  /*!< Enable HSE */    
  RCC->CR |= ((uint32_t)RCC_CR_HSEON);
 
  /*!< Wait till HSE is ready and if Time out is reached exit */
  do
  {
    HSEStatus = RCC->CR & RCC_CR_HSERDY;
    StartUpCounter++;  
  } while((HSEStatus == 0) && (StartUpCounter != HSEStartUp_TimeOut));

  if ((RCC->CR & RCC_CR_HSERDY) != RESET)
  {
    HSEStatus = (uint32_t)0x01;
  }
  else
  {
    HSEStatus = (uint32_t)0x00;
  }  

  if (HSEStatus == (uint32_t)0x01)
  {
    /*!< Enable Prefetch Buffer */
    FLASH->ACR |= FLASH_ACR_PRFTBE;

    /*!< Flash 2 wait state */
    FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_2;    
 
    /*!< HCLK = SYSCLK */
    RCC->CFGR |= (uint32_t)RCC_CFGR_HPRE_DIV1;
      
    /*!< PCLK2 = HCLK */
    RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE2_DIV1;
    
    /*!< PCLK1 = HCLK */
    RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE1_DIV2;
    
    /*!< PLLCLK = 8MHz * 9 = 72 MHz */
    RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_PLLSRC | RCC_CFGR_PLLXTPRE | RCC_CFGR_PLLMULL));
    RCC->CFGR |= (uint32_t)(RCC_CFGR_PLLSRC | RCC_CFGR_PLLMULL9);

    /*!< Enable PLL */
    RCC->CR |= RCC_CR_PLLON;

    /*!< Wait till PLL is ready */
    while((RCC->CR & RCC_CR_PLLRDY) == 0)
    {
    }

    /*!< Select PLL as system clock source */
    RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_SW));
    RCC->CFGR |= (uint32_t)RCC_CFGR_SW_PLL;    

    /*!< Wait till PLL is used as system clock source */
    while ((RCC->CFGR & (uint32_t)RCC_CFGR_SWS) != (uint32_t)0x08)
    {
    }
  }
  else
  { /*!< If HSE fails to start-up, the application will have wrong clock 
         configuration. User can add here some code to deal with this error */    

    /*!< Go to infinite loop */
    while (1)
    {
    }
  }
}
#endif

/**
  * @}
  */
  
/******************* (C) COPYRIGHT 2009 STMicroelectronics *****END OF FILE****/