C++ RCC_GetFlagStatus函数代码示例

/**
  * @brief  Main program.
  * @param  None
  * @retval None
  */
int main(void)
{
  /*!< At this stage the microcontroller clock setting is already configured, 
       this is done through SystemInit() function which is called from startup
       file (startup_stm32l1xx_xx.s) before to branch to application main.
       To reconfigure the default setting of SystemInit() function, refer to
       system_stm32l1xx.c file
     */

  /* --------------------- System Clocks Configuration -----------------------*/
  /* Enable GPIOA clock */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);

  /* Enable PWR clock */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);

  /* Allow access to the RTC */
  PWR_RTCAccessCmd(ENABLE);

  /* Reset Backup Domain */
  RCC_RTCResetCmd(ENABLE);
  RCC_RTCResetCmd(DISABLE);

  /*!< LSE Enable */
  RCC_LSEConfig(RCC_LSE_ON);

  /*!< Wait till LSE is ready */
  while (RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET)
  {}
  
  /* TIM9 Periph clock enable */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM9, ENABLE);     

  /*--------------------- TIM Configuration ----------------------------------*/
  /* TIM9 pins configuration: PA2 */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  /* Remap PA2 to TIM9 Channel 1 */
  GPIO_PinAFConfig(GPIOA, GPIO_PinSource2, GPIO_AF_TIM9);

  /* Time base configuration: TIM9 */
  /* PWM frequency = 32.768 / (0x1F + 1) = 1KHz */
  TIM_TimeBaseStructure.TIM_Period = 0x1F;
  TIM_TimeBaseStructure.TIM_Prescaler = 0x0;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  
  TIM_TimeBaseInit(TIM9, &TIM_TimeBaseStructure);

  /* PWM1 Mode configuration: TIM9 Channel1 */
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  
  /* Duty cycle = 0x08 / (0x1F + 1) * 100 = 25 % */
  TIM_OCInitStructure.TIM_Pulse = 0x08;
  
  TIM_OC1Init(TIM9, &TIM_OCInitStructure);

  /* External clock configuration TIM9(LSE(32.768KHz)) */
  TIM_ETRClockMode1Config(TIM9, TIM_ExtTRGPSC_OFF, TIM_ExtTRGPolarity_Inverted, 0);

  /* Enable TIM counter */
  TIM_Cmd(TIM9, ENABLE);
  
  while (1)
  {
  }
}

/*******************************************************************************
* Function Name  : rtc_init
* Description    : initializes HW RTC,
*                  sets default time-stamp if RTC has not been initialized before
* Input          : None
* Output         : None
* Return         : not used
*  Based on code from a STM RTC example in the StdPeriph-Library package
*******************************************************************************/
int rtc_init(void)
{
	volatile uint16_t i;

	/* Enable PWR and BKP clocks */
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR | RCC_APB1Periph_BKP, ENABLE);

	/* LSI clock stabilization time */
	for(i=0;i<5000;i++) { ; }

	//if (BKP_ReadBackupRegister(BKP_DR1) != 0xA5A5) {
		/* Backup data register value is not correct or not yet programmed (when
		   the first time the program is executed) */

		/* Allow access to BKP Domain */
		PWR_BackupAccessCmd(ENABLE);

		/* Reset Backup Domain */
		BKP_DeInit();

		/* Enable LSE */
		RCC_LSICmd(ENABLE);

		/* Wait till LSE is ready */
		while (RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET) { ; }

		/* Select LSE as RTC Clock Source */
		RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI);

		/* Enable RTC Clock */
		RCC_RTCCLKCmd(ENABLE);

		/* Wait for RTC registers synchronization */
		RTC_WaitForSynchro();

		/* Wait until last write operation on RTC registers has finished */
		RTC_WaitForLastTask();

		/* Set RTC prescaler: set RTC period to 1sec */
		RTC_SetPrescaler(32767); /* RTC period = RTCCLK/RTC_PR = (32.768 KHz)/(32767+1) */

		/* Wait until last write operation on RTC registers has finished */
		RTC_WaitForLastTask();

		/* Set initial value */
		RTC_SetCounter( (uint32_t)((11*60+55)*60) ); // here: 1st January 2000 11:55:00

		/* Wait until last write operation on RTC registers has finished */
		RTC_WaitForLastTask();

		BKP_WriteBackupRegister(BKP_DR1, 0xA5A5);

		/* Lock access to BKP Domain */
		PWR_BackupAccessCmd(DISABLE);

	//} else {

		/* Wait for RTC registers synchronization */
	//	RTC_WaitForSynchro();

	//}

	return 0;
}

/**
  * @brief  Configures TIM5 to measure the LSI oscillator frequency. 
  * @param  None
  * @retval LSI Frequency
  */
uint32_t GetLSIFrequency(void)
{
  NVIC_InitTypeDef   NVIC_InitStructure;
  TIM_ICInitTypeDef  TIM_ICInitStructure;
  RCC_ClocksTypeDef  RCC_ClockFreq;

#ifndef NO_MICO_RTOS
  mico_rtos_init_semaphore(&_measureLSIComplete_SEM, 1);
#else
  _measureLSIComplete_SEM = false;
#endif


  /* Enable the LSI oscillator ************************************************/
  RCC_LSICmd(ENABLE);
  
  /* Wait till LSI is ready */
  while (RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET)
  {}
  
  /* TIM5 configuration *******************************************************/ 
  /* Enable TIM5 clock */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE);
  
  /* Connect internally the TIM5_CH4 Input Capture to the LSI clock output */
  TIM_RemapConfig(TIM5, TIM5_LSI);

  /* Configure TIM5 presclaer */
  TIM_PrescalerConfig(TIM5, 0, TIM_PSCReloadMode_Immediate);
  
  /* TIM5 configuration: Input Capture mode ---------------------
     The LSI oscillator is connected to TIM5 CH4
     The Rising edge is used as active edge,
     The TIM5 CCR4 is used to compute the frequency value 
  ------------------------------------------------------------ */
  TIM_ICInitStructure.TIM_Channel = TIM_Channel_4;
  TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
  TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
  TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV8;
  TIM_ICInitStructure.TIM_ICFilter = 0;
  TIM_ICInit(TIM5, &TIM_ICInitStructure);
  
  /* Enable TIM5 Interrupt channel */
  NVIC_InitStructure.NVIC_IRQChannel = TIM5_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

  /* Enable TIM5 counter */
  TIM_Cmd(TIM5, ENABLE);

  /* Reset the flags */
  TIM5->SR = 0;
    
  /* Enable the CC4 Interrupt Request */  
  TIM_ITConfig(TIM5, TIM_IT_CC4, ENABLE);

  /* Wait until the TIM5 get 2 LSI edges (refer to TIM5_IRQHandler()) *********/
#ifndef NO_MICO_RTOS
  mico_rtos_get_semaphore(&_measureLSIComplete_SEM, MICO_WAIT_FOREVER);
  mico_rtos_deinit_semaphore( &_measureLSIComplete_SEM );
  _measureLSIComplete_SEM = NULL;
#else
  while( _measureLSIComplete_SEM == false);
#endif

  /* Deinitialize the TIM5 peripheral registers to their default reset values */
  TIM_ITConfig(TIM5, TIM_IT_CC4, DISABLE);
  TIM_DeInit(TIM5);
  NVIC_InitStructure.NVIC_IRQChannel = TIM5_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 5;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 8;
  NVIC_InitStructure.NVIC_IRQChannelCmd = DISABLE;
  NVIC_Init(&NVIC_InitStructure);

  /* Compute the LSI frequency, depending on TIM5 input clock frequency (PCLK1)*/
  /* Get SYSCLK, HCLK and PCLKx frequency */
  RCC_GetClocksFreq(&RCC_ClockFreq);

  /* Get PCLK1 prescaler */
  if ((RCC->CFGR & RCC_CFGR_PPRE1) == 0)
  { 
    /* PCLK1 prescaler equal to 1 => TIMCLK = PCLK1 */
    return ((RCC_ClockFreq.PCLK1_Frequency / PeriodValue) * 8);
  }
  else
  { /* PCLK1 prescaler different from 1 => TIMCLK = 2 * PCLK1 */
    return (((2 * RCC_ClockFreq.PCLK1_Frequency) / PeriodValue) * 8) ;
  }
}

/**
  * @brief  Selects PLL as System clock source and configure HCLK, PCLK2 and PCLK1 prescalers.
  * @param  None
  * @retval None
  */
void SetHCLKTo32(void)
{
  /* SYSCLK, HCLK, PCLK2 and PCLK1 configuration -----------------------------*/
  /* RCC system reset(for debug purpose) */
  RCC_DeInit();

  /* Enable HSE */
  RCC_HSEConfig(RCC_HSE_ON);

  /* Wait till HSE is ready */
  HSEStartUpStatus = RCC_WaitForHSEStartUp();

  if (HSEStartUpStatus == SUCCESS)
  {
    /* Enable 64-bit access */
    FLASH_ReadAccess64Cmd(ENABLE);

    /* Enable Prefetch Buffer */
    FLASH_PrefetchBufferCmd(ENABLE);

    /* Flash 1 wait state */
    FLASH_SetLatency(FLASH_Latency_1);

    /* Enable the PWR APB1 Clock */
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);

    /* Select the Voltage Range 1 (1.8V) */
    PWR_VoltageScalingConfig(PWR_VoltageScaling_Range1);

    /* Wait Until the Voltage Regulator is ready */
    while (PWR_GetFlagStatus(PWR_FLAG_VOS) != RESET)
    {}

    /* HCLK = SYSCLK */
    RCC_HCLKConfig(RCC_SYSCLK_Div1);

    /* PCLK2 = HCLK */
    RCC_PCLK2Config(RCC_HCLK_Div1);

    /* PCLK1 = HCLK */
    RCC_PCLK1Config(RCC_HCLK_Div1);

    /*  PLL configuration: PLLCLK = (HSE * 12) / 3 = 32MHz */
    RCC_PLLConfig(RCC_PLLSource_HSE, RCC_PLLMul_12, RCC_PLLDiv_3);

    /* Enable PLL */
    RCC_PLLCmd(ENABLE);

    /* Wait till PLL is ready */
    while (RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
    {}

    /* Select PLL as system clock source */
    RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);

    /* Wait till PLL is used as system clock source */
    while (RCC_GetSYSCLKSource() != 0x0C)
    {}
  }
  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)
    {}
  }
}

/*******************************************************************************
* Function Name  : Set_System
* Description    : Configures Main system clocks & power
* Input          : None.
* Return         : None.
*******************************************************************************/
void Set_System(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

  /* SYSCLK, HCLK, PCLK2 and PCLK1 configuration -----------------------------*/
  /* RCC system reset(for debug purpose) */
  RCC_DeInit();

  /* Enable HSE */
  RCC_HSEConfig(RCC_HSE_ON);

  /* Wait till HSE is ready */
  HSEStartUpStatus = RCC_WaitForHSEStartUp();

  if (HSEStartUpStatus == SUCCESS)
  {
    /* Enable Prefetch Buffer */
    FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);

    /* Flash 2 wait state */
    FLASH_SetLatency(FLASH_Latency_2);

    /* HCLK = SYSCLK */
    RCC_HCLKConfig(RCC_SYSCLK_Div1);

    /* PCLK2 = HCLK */
    RCC_PCLK2Config(RCC_HCLK_Div1);

    /* PCLK1 = HCLK/2 */
    RCC_PCLK1Config(RCC_HCLK_Div2);

    /* ADCCLK = PCLK2/6 */
    RCC_ADCCLKConfig(RCC_PCLK2_Div6);

    RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);

    /* Enable PLL */
    RCC_PLLCmd(ENABLE);

    /* Wait till PLL is ready */
    while (RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
    {}

    /* Select PLL as system clock source */
    RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);

    /* Wait till PLL is used as system clock source */
    while (RCC_GetSYSCLKSource() != 0x08)
    {}
  }

  /* Enable GPIOA, GPIOD and USART1 clock */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOD
                         | RCC_APB2Periph_USART1, ENABLE);

  /* Enable USB_DISCONNECT GPIO clock */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIO_DISCONNECT, ENABLE);

  /* Configure USB pull-up pin */
  GPIO_InitStructure.GPIO_Pin = USB_DISCONNECT_PIN;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD;
  GPIO_Init(USB_DISCONNECT, &GPIO_InitStructure);

  /* Configure USART1 Rx (PA.10) as input floating */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  /* Configure USART1 Tx (PA.09) as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
}

/**
  * @brief  Configures TIM10 to measure the LSI oscillator frequency. 
  * @param  None
  * @retval LSI Frequency
  */
uint32_t GetLSIFrequency(void)
{
  NVIC_InitTypeDef   NVIC_InitStructure;
  TIM_ICInitTypeDef  TIM_ICInitStructure;
  RCC_ClocksTypeDef  RCC_ClockFreq;

  /* Enable the LSI oscillator ************************************************/
  RCC_LSICmd(ENABLE);
  
  /* Wait till LSI is ready */
  while (RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET)
  {}

  /* TIM10 configuration *******************************************************/ 
  /* Enable TIM10 clock */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM10, ENABLE);
  
  /* Reset TIM10 registers */
  TIM_DeInit(TIM10);

  /* Configure TIM10 prescaler */
  TIM_PrescalerConfig(TIM10, 0, TIM_PSCReloadMode_Immediate);

  /* Connect LSI clock to TIM10 Input Capture 1 */
  TIM_RemapConfig(TIM10, TIM10_LSI);

  /* TIM10 configuration: Input Capture mode ---------------------
     The reference clock(LSE or external) is connected to TIM10 CH1
     The Rising edge is used as active edge,
     The TIM10 CCR1 is used to compute the frequency value 
  ------------------------------------------------------------ */
  TIM_ICInitStructure.TIM_Channel     = TIM_Channel_1;
  TIM_ICInitStructure.TIM_ICPolarity  = TIM_ICPolarity_Rising;
  TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
  TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV8;
  TIM_ICInitStructure.TIM_ICFilter = 0x0;
  TIM_ICInit(TIM10, &TIM_ICInitStructure);

  /* Enable the TIM10 global Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = TIM10_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

  /* Enable TIM10 counter */
  TIM_Cmd(TIM10, ENABLE);

  /* Reset the flags */
  TIM10->SR = 0;
    
  /* Enable the CC4 Interrupt Request */  
  TIM_ITConfig(TIM10, TIM_IT_CC1, ENABLE);


  /* Wait until the TIM10 get 2 LSI edges (refer to TIM10_IRQHandler() in 
    stm32l1xx_it.c file) ******************************************************/
  while(CaptureNumber != 2)
  {
  }
  /* Deinitialize the TIM10 peripheral registers to their default reset values */
  TIM_DeInit(TIM10);


  /* Compute the LSI frequency, depending on TIM10 input clock frequency (PCLK1)*/
  /* Get SYSCLK, HCLK and PCLKx frequency */
  RCC_GetClocksFreq(&RCC_ClockFreq);

  /* Get PCLK1 prescaler */
  if ((RCC->CFGR & RCC_CFGR_PPRE1) == 0)
  { 
    /* PCLK1 prescaler equal to 1 => TIMCLK = PCLK1 */
    return ((RCC_ClockFreq.PCLK1_Frequency / PeriodValue) * 8);
  }
  else
  { /* PCLK1 prescaler different from 1 => TIMCLK = 2 * PCLK1 */
    return (((2 * RCC_ClockFreq.PCLK1_Frequency) / PeriodValue) * 8) ;
  }
}

/**
  * @brief  Main program
  * @param  None
  * @retval None
  */
int main(void)
{
  /*!< At this stage the microcontroller clock setting is already configured, 
       this is done through SystemInit() function which is called from startup
       file (startup_stm32l1xx_xx.s) before to branch to application main.
       To reconfigure the default setting of SystemInit() function, refer to
       system_stm32l1xx.c file
     */     
       
  /* RTC configuration -------------------------------------------------------*/
  RTC_Config();

  /* Configure the SysTick to generate an interrupt each 250 ms */
  SysTickConfig();
  
  /* LCD GLASS Initialization */
  LCD_GLASS_Init();

  /* Clear the LCD GLASS */
  LCD_GLASS_Clear();

  /* Configure STM32L152-EVAL LED1 and LED2 as Output push-pull */
  STM_EVAL_LEDInit(LED1);
  STM_EVAL_LEDInit(LED2);

  while (1)
  {
    /* Display " STM32L " string on LCD glass in scrolling mode */
    LCD_GLASS_ScrollString(LCD_String, SCROLL_NUM, SCROLL_SPEED);  

    /* Display String on the LCD */
#ifdef USE_STM32L152D_EVAL
    LCD_GLASS_DisplayString("STOPMOD");
#else
    LCD_GLASS_DisplayString("STOPMODE");
#endif
   

    /* Enable Wakeup Counter */
    RTC_WakeUpCmd(ENABLE);

    /* Enter Stop Mode */
    PWR_EnterSTOPMode(PWR_Regulator_LowPower, PWR_STOPEntry_WFI);

    /* Enable Wakeup Counter */
    RTC_WakeUpCmd(DISABLE);
    
    /* After wake-up from STOP reconfigure the system clock */
    /* Enable HSE */
    RCC_HSEConfig(RCC_HSE_ON);

    /* Wait till HSE is ready */
    while (RCC_GetFlagStatus(RCC_FLAG_HSERDY) == RESET)
    {}
    
    /* Enable PLL */
    RCC_PLLCmd(ENABLE);
    
    /* Wait till PLL is ready */
    while (RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
    {}
    
    /* Select PLL as system clock source */
    RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
    
    /* Wait till PLL is used as system clock source */
    while (RCC_GetSYSCLKSource() != 0x0C)
    {}
  }
}

/**
  * @brief  Configures the different system clocks.
  * @param  None
  * @retval None
  */
void RCC_Configuration(void)
{
  /* RCC system reset(for debug purpose) */
  RCC_DeInit();

  /* Enable HSE */
  RCC_HSEConfig(RCC_HSE_ON);

  /* Wait till HSE is ready */
  HSEStartUpStatus = RCC_WaitForHSEStartUp();

  if(HSEStartUpStatus == SUCCESS)
  {
    /* Enable Prefetch Buffer */
    FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);

    /* Flash 2 wait state */
    FLASH_SetLatency(FLASH_Latency_2);
	
    /* HCLK = SYSCLK */
    RCC_HCLKConfig(RCC_SYSCLK_Div1); 
  
    /* PCLK2 = HCLK */
    RCC_PCLK2Config(RCC_HCLK_Div1); 

    /* PCLK1 = HCLK/2 */
    RCC_PCLK1Config(RCC_HCLK_Div2);

    /* ADCCLK = PCLK2/4 */
    RCC_ADCCLKConfig(RCC_PCLK2_Div4); 
  
#ifndef STM32F10X_CL  
    /* PLLCLK = 8MHz * 9 = 72 MHz */
    RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);

#else
    /* Configure PLLs *********************************************************/
    /* PLL2 configuration: PLL2CLK = (HSE / 5) * 8 = 40 MHz */
    RCC_PREDIV2Config(RCC_PREDIV2_Div5);
    RCC_PLL2Config(RCC_PLL2Mul_8);

    /* Enable PLL2 */
    RCC_PLL2Cmd(ENABLE);

    /* Wait till PLL2 is ready */
    while (RCC_GetFlagStatus(RCC_FLAG_PLL2RDY) == RESET)
    {}

    /* PLL configuration: PLLCLK = (PLL2 / 5) * 9 = 72 MHz */ 
    RCC_PREDIV1Config(RCC_PREDIV1_Source_PLL2, RCC_PREDIV1_Div5);
    RCC_PLLConfig(RCC_PLLSource_PREDIV1, RCC_PLLMul_9);

    /* PPL3 configuration: PLL3CLK = (HSE / 5) * 11 = PLL3_VCO = 110 MHz */
    RCC_PLL3Config(RCC_PLL3Mul_11);
    /* Enable PLL3 */
    RCC_PLL3Cmd(ENABLE);    
    /* Wait till PLL3 is ready */
    while (RCC_GetFlagStatus(RCC_FLAG_PLL3RDY) == RESET)
    {}

    /* Configure I2S clock source: On Connectivity-Line Devices, the I2S can be 
        clocked by PLL3 VCO instead of SYS_CLK in order to guarantee higher 
        precision */
    RCC_I2S3CLKConfig(RCC_I2S3CLKSource_PLL3_VCO);
    RCC_I2S2CLKConfig(RCC_I2S2CLKSource_PLL3_VCO);  
#endif

    /* Enable PLL */ 
    RCC_PLLCmd(ENABLE);

    /* Wait till PLL is ready */
    while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
    {
    }

    /* Select PLL as system clock source */
    RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);

    /* Wait till PLL is used as system clock source */
    while(RCC_GetSYSCLKSource() != 0x08)
    {
    }
  }  
  
  /* Enable peripheral clocks --------------------------------------------------*/
  /* GPIOA, GPIOB and AFIO clocks enable */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB |
                         RCC_APB2Periph_AFIO, ENABLE);

#ifdef USE_STM3210C_EVAL 
  /* GPIOC Clock enable (for the SPI3 remapped pins)  */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC , ENABLE);  
#endif /* USE_STM3210C_EVAL */  
  
  /* SPI2 and SPI3 clocks enable */
//.........这里部分代码省略.........

/*******************************************************************************
* Function Name  : RCC_Configuration
* Description    : Configures the different system clocks.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void RCC_Configuration(void)
{
  /* RCC system reset(for debug purpose) */
  RCC_DeInit();

  /* Enable HSE */
  RCC_HSEConfig(RCC_HSE_ON);

  /* Wait till HSE is ready */
  HSEStartUpStatus = RCC_WaitForHSEStartUp();

  if(HSEStartUpStatus == SUCCESS)
  {
    /* Enable Prefetch Buffer */
    FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);

    /* Flash 2 wait state */
    FLASH_SetLatency(FLASH_Latency_2);
 
    /* HCLK = SYSCLK */
    RCC_HCLKConfig(RCC_SYSCLK_Div1); 
  
    /* PCLK2 = HCLK */
    RCC_PCLK2Config(RCC_HCLK_Div1); 

    /* PCLK1 = HCLK/2 */
    RCC_PCLK1Config(RCC_HCLK_Div2);

    /* PLLCLK = 8MHz * 9 = 72 MHz */
    RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);

    /* Enable PLL */ 
    RCC_PLLCmd(ENABLE);

    /* Wait till PLL is ready */
    while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
    {
    }

    /* Select PLL as system clock source */
    RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);

    /* Wait till PLL is used as system clock source */
    while(RCC_GetSYSCLKSource() != 0x08)
    {
    }
  }  
  
  /* GPIOA, GPIOC, GPIO KEY Button, GPIO_LED and AFIO clocks enable */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIO_KEY_BUTTON | 
                         RCC_APB2Periph_GPIO_LED | RCC_APB2Periph_GPIOC |
                         RCC_APB2Periph_AFIO, ENABLE);
   
#ifdef RTC_Alarm_WFEWakeUp
  /* Enable the PWR and BKP Clocks */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR | RCC_APB1Periph_BKP, ENABLE);

  /* Configure the EXTI Line 17 as Event */
  EXTI_StructInit(&EXTI_InitStructure);
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Event;
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
  EXTI_InitStructure.EXTI_Line = EXTI_Line17;
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;
  EXTI_Init(&EXTI_InitStructure);
  
  /* Allow access to BKP Domain */
  PWR_BackupAccessCmd(ENABLE);

  /* Reset Backup Domain */
  BKP_DeInit();
  /* Enable LSE */
  RCC_LSEConfig(RCC_LSE_ON);
  /* Wait till LSE is ready */
  while(RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET)
  {
  }

  /* Select LSE as RTC Clock Source */
  RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE);

  /* Enable the RTC Clock */
  RCC_RTCCLKCmd(ENABLE);
  /* Wait for APB registers synchronisation */
  RTC_WaitForSynchro();
  
  /* Wait until last write operation on RTC registers has finished */
  RTC_WaitForLastTask();
  /* Set the RTC time base to 1s */
  RTC_SetPrescaler(32767);
    /* Wait until last write operation on RTC registers has finished */
  RTC_WaitForLastTask();
#endif 

//.........这里部分代码省略.........

/**
  * @brief  Configures the RTC.
  * @param  None
  * @retval None
  */
void RTC_Config(void)
{
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);

  /* Allow access to BKP Domain */
  PWR_BackupAccessCmd(ENABLE);

  /* Clear Wakeup flag */
  PWR_ClearFlag(PWR_FLAG_WU);

  /* Check if the StandBy flag is set */
  if (PWR_GetFlagStatus(PWR_FLAG_SB) != RESET)
  {
    /* Clear StandBy flag */
    PWR_ClearFlag(PWR_FLAG_SB);

    /* Wait for RTC APB registers synchronisation (needed after start-up from Reset)*/
    RTC_WaitForSynchro();
    /* No need to configure the RTC as the RTC config(clock source, enable,
       prescaler,...) are kept after wake-up from STANDBY */
  }
  else
  {
    /* RTC Configuration ******************************************************/
    /* Reset Backup Domain */
    RCC_BackupResetCmd(ENABLE);
    RCC_BackupResetCmd(DISABLE);

/* The RTC Clock may varies due to LSI frequency dispersion. */
    /* Enable the LSI OSC */
    RCC_LSICmd(ENABLE);

    /* Wait till LSI is ready */
    while(RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET)
    {
    }

    /* Select the RTC Clock Source */
    RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI);

    SynchPrediv = 0xFF;
    AsynchPrediv = 0x7F;


    /* Enable the RTC Clock */
    RCC_RTCCLKCmd(ENABLE);

    /* Wait for RTC APB registers synchronisation (needed after start-up from Reset)*/
    RTC_WaitForSynchro();

    /* Set the RTC time base to 1s */
    RTC_InitStructure.RTC_HourFormat = RTC_HourFormat_24;
    RTC_InitStructure.RTC_AsynchPrediv = 0x7F;
    RTC_InitStructure.RTC_SynchPrediv = 0x00FF;

    if (RTC_Init(&RTC_InitStructure) == ERROR)
    {
      /* Turn on LED3 */
      STM_EVAL_LEDOn(LED3);

      /* User can add here some code to deal with this error */
      while(1);
    }

    /* Set the time to 01h 00mn 00s AM */
    RTC_TimeStructure.RTC_H12     = RTC_H12_AM;
    RTC_TimeStructure.RTC_Hours   = 0x01;
    RTC_TimeStructure.RTC_Minutes = 0x00;
    RTC_TimeStructure.RTC_Seconds = 0x00;

    if(RTC_SetTime(RTC_Format_BCD, &RTC_TimeStructure) == ERROR)
    {
      /* Turn on LED3 */
      STM_EVAL_LEDOn(LED3);

      /* User can add here some code to deal with this error */
      while(1);
    }
  }

  /* Clear RTC Alarm Flag */
  RTC_ClearFlag(RTC_FLAG_ALRAF);
}

/**
  * @brief  Main program
  * @param  None
  * @retval None
  */
int main(void)
{
  /*!< At this stage the microcontroller clock setting is already configured, 
       this is done through SystemInit() function which is called from startup
       file (startup_stm32f4xx.s) before to branch to application main.
       To reconfigure the default setting of SystemInit() function, refer to
       system_stm32f4xx.c file
     */     
    NVIC_InitTypeDef  NVIC_InitStructure;
    EXTI_InitTypeDef  EXTI_InitStructure;

    LEDGpio_Init();
    EXTILine0_Config();  
    EXTILine6_Config();
    uart_init();
    /* Output a message on Hyperterminal using printf function */
    printf("\n\r  *********************** RTC Hardware Calendar Example ***********************\n\r");
  
    if (RTC_ReadBackupRegister(RTC_BKP_DR0) != 0x32F2)
    {  
        /* RTC configuration  */
        RTC_Config();

        /* Configure the RTC data register and RTC prescaler */
        RTC_InitStructure.RTC_AsynchPrediv = AsynchPrediv;
        RTC_InitStructure.RTC_SynchPrediv = SynchPrediv;
        RTC_InitStructure.RTC_HourFormat = RTC_HourFormat_24;
   
        /* Check on RTC init */
        if (RTC_Init(&RTC_InitStructure) == ERROR)
        {
          printf("\n\r        /!\\***** RTC Prescaler Config failed ********/!\\ \n\r");
        }

        /* Configure the time register */
        RTC_TimeRegulate(); 
    }
    else
    {
        /* Check if the Power On Reset flag is set */
        if (RCC_GetFlagStatus(RCC_FLAG_PORRST) != RESET)
        {
            printf("\r\n Power On Reset occurred....\n\r");
        }
        /* Check if the Pin Reset flag is set */
        else if (RCC_GetFlagStatus(RCC_FLAG_PINRST) != RESET)
        {
            printf("\r\n External Reset occurred....\n\r");
        }

        printf("\n\r No need to configure RTC....\n\r");
        
        /* Enable the PWR clock */
        RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
        
        /* Allow access to RTC */
        PWR_BackupAccessCmd(ENABLE);
        
        /* Wait for RTC APB registers synchronisation */
        RTC_WaitForSynchro();
        
        /* Clear the RTC Alarm Flag */
        RTC_ClearFlag(RTC_FLAG_ALRAF);
        
        /* Clear the EXTI Line 17 Pending bit (Connected internally to RTC Alarm) */
        EXTI_ClearITPendingBit(EXTI_Line17);
        
        /* Display the RTC Time and Alarm */
        RTC_TimeShow();
        RTC_AlarmShow();
  }
   
//  /* Configure the external interrupt "WAKEUP", "KEY" and "TAMPER" buttons */
//  STM_EVAL_PBInit(BUTTON_KEY, BUTTON_MODE_EXTI); 
//  STM_EVAL_PBInit(BUTTON_TAMPER , BUTTON_MODE_EXTI);
//  STM_EVAL_PBInit(BUTTON_WAKEUP , BUTTON_MODE_EXTI);
//
//  /* Configure LEDx */
//  STM_EVAL_LEDInit(LED1);
//  STM_EVAL_LEDInit(LED2);
//
//  /* Turn LED1 ON */
//  STM_EVAL_LEDOn(LED2);

    /* RTC Alarm A Interrupt Configuration */
    /* EXTI configuration *********************************************************/
    EXTI_ClearITPendingBit(EXTI_Line17);
    EXTI_InitStructure.EXTI_Line = EXTI_Line17;
    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
    EXTI_InitStructure.EXTI_LineCmd = ENABLE;
    EXTI_Init(&EXTI_InitStructure);
    
    /* Enable the RTC Alarm Interrupt */
    NVIC_InitStructure.NVIC_IRQChannel = RTC_Alarm_IRQn;
//.........这里部分代码省略.........

void RCC_Conf()
{

	//zmienna opisujaca rezultat uruchomienia HSE
	ErrorStatus HSEStartUpStatus;

	//Reset ustawien RCC
	RCC_DeInit();

	//wlacz HSE
	RCC_HSEConfig(RCC_HSE_ON);

	//czekaj na gotowosc HSE
	HSEStartUpStatus = RCC_WaitForHSEStartUp();

	if(HSEStartUpStatus == SUCCESS)
	{
		//ustaw opoznienie dla pamieci flash w zaleznosci od taktowania rdzenia
		//opoznienie 0 cykli, gdy F_CPU <24MHz
		//opoznienie 1 cykl,  gdy F_CPU 24~48 MHz
		//opoznienie 2 cykle gdy F_CPU >48 MHz
		FLASH_PrefetchBufferCmd(ENABLE);
		FLASH_SetLatency(FLASH_Latency_5);

		//ustaw HCLK = SYSCLK
		RCC_HCLKConfig(RCC_SYSCLK_Div1);
		//ustaw PCLK1 = HCLK/2
		RCC_PCLK1Config(RCC_HCLK_Div4); //MAX 42MHz
		//ustaw PCLK2 = HCLK
		RCC_PCLK2Config(RCC_HCLK_Div2); //MAX 84 MHz

		//ustaw PLLCLK 	PLLM = 8, PLLN = 336, PLLP = 2, PLLQ = 7
		//PLLCLK = (HSE * (PLLN/PLLM))/PLLP  = 168MHz 			(MAX 168MHz)
		//USB OTG FS, SDIO, RNG clock output = PLLCLK / PLLQ  	(MAX 48MHz)
		RCC_PLLConfig(RCC_PLLSource_HSE,8,336,2,7);

		//wlacz PLL
		RCC_PLLCmd(ENABLE);

		//odczekaj na poprawne uruchomienie PLL
		while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET);

		//ustaw PLL jako zrodlo sygnalu zegarowego
		RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);

		//odczekaj az PLL bedzie sygnalem zegarowym systemu
		while(RCC_GetSYSCLKSource() != 0x08);

		/*kod zwiazany z konfiguracja sygnalow zegarowych potrzebnych w programie peryferiow*/

		//Wlacz taktowanie portu D
		RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);
	}else
	{}

	RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD,ENABLE);
	GPIO_InitTypeDef GPIO_InitStructure;

		GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
		GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
		GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
		GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
		GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
		GPIO_Init(GPIOD, &GPIO_InitStructure);

		GPIO_ResetBits(GPIOD,GPIO_Pin_13);

}

/**
  * @brief  Main program
  * @param  None
  * @retval None
  */
int main(void)
{
  /*!< At this stage the microcontroller clock setting is already configured,
       this is done through SystemInit() function which is called from startup
       file (startup_stm32f2xx.s) before to branch to application main.
       To reconfigure the default setting of SystemInit() function, refer to
       system_stm32f2xx.c file
     */
  /* USARTx configured as follow:
        - BaudRate = 115200 baud
        - Word Length = 8 Bits
        - One Stop Bit
        - No parity
        - Hardware flow control disabled (RTS and CTS signals)
        - Receive and transmit enabled
  */
  USART_InitStructure.USART_BaudRate = 115200;
  USART_InitStructure.USART_WordLength = USART_WordLength_8b;
  USART_InitStructure.USART_StopBits = USART_StopBits_1;
  USART_InitStructure.USART_Parity = USART_Parity_No;
  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;

  STM_EVAL_COMInit(COM1, &USART_InitStructure);

  /* Output a message on Hyperterminal using printf function */
  printf("\n\r  *********************** RTC Time Stamp Example ***********************\n\r");

  if (RTC_ReadBackupRegister(RTC_BKP_DR0) != 0x32F2)
  {
    /* RTC configuration  */
    RTC_Config();

    /* Configure the RTC data register and RTC prescaler */
    RTC_InitStructure.RTC_AsynchPrediv = AsynchPrediv;
    RTC_InitStructure.RTC_SynchPrediv = SynchPrediv;
    RTC_InitStructure.RTC_HourFormat = RTC_HourFormat_24;

    /* Check on RTC init */
    if (RTC_Init(&RTC_InitStructure) == ERROR)
    {
      printf("\n\r        /!\\***** RTC Prescaler Config failed ********/!\\ \n\r");
    }

    /* Configure the time register */
    RTC_TimeRegulate();
  }
  else
  {
    /* Check if the Power On Reset flag is set */
    if (RCC_GetFlagStatus(RCC_FLAG_PORRST) != RESET)
    {
      printf("\r\n Power On Reset occurred....\n\r");
    }
    /* Check if the Pin Reset flag is set */
    else if (RCC_GetFlagStatus(RCC_FLAG_PINRST) != RESET)
    {
      printf("\r\n External Reset occurred....\n\r");
    }

    printf("\r\n No need to configure RTC....\n\r");

    /* Enable the PWR clock */
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);

    /* Allow access to RTC */
    PWR_BackupAccessCmd(ENABLE);

    /* Wait for RTC APB registers synchronisation */
    RTC_WaitForSynchro();

    /* Clear the RTC Alarm Flag */
    RTC_ClearFlag(RTC_FLAG_ALRAF);

    /* Clear the EXTI Line 17 Pending bit (Connected internally to RTC Alarm) */
    EXTI_ClearITPendingBit(EXTI_Line17);

    /* Display the RTC Time/Date and TimeStamp Time/Date */
    RTC_TimeShow();
    RTC_DateShow();
    RTC_TimeStampShow();
  }

  /* Configure the external interrupt "WAKEUP", "KEY" and "TAMPER" buttons */
  STM_EVAL_PBInit(BUTTON_KEY, BUTTON_MODE_EXTI);
  STM_EVAL_PBInit(BUTTON_TAMPER , BUTTON_MODE_EXTI);
  STM_EVAL_PBInit(BUTTON_WAKEUP , BUTTON_MODE_EXTI);

  /* Configure LED1 */
  STM_EVAL_LEDInit(LED1);
  STM_EVAL_LEDOn(LED1);

  while (1)
  {
  }
//.........这里部分代码省略.........

/**
  * @brief LCD Configuration.
  * @note  This function Configure tha LTDC peripheral :
  *        1) Configure the Pixel Clock for the LCD
  *        2) Configure the LTDC Timing and Polarity
  *        3) Configure the LTDC Layer 1 :
  *           - indirect color (L8) as pixel format  
  *           - The frame buffer is located at FLASH memory
  *           - The Layer size configuration : 320x240
  *        4) Configure the LTDC Layer 2 :
  *           - The frame buffer is located at FLASH memory
  *           - The Layer size configuration : 320x240  
  *        5) Load 256 colors in CLUT address for Layer 1                       
  * @retval
  *  None
  */
static void LCD_Config(void)
{
  LTDC_InitTypeDef       LTDC_InitStruct;
  LTDC_Layer_InitTypeDef LTDC_Layer_InitStruct;
  LTDC_CLUT_InitTypeDef  LTDC_CLUT_InitStruct;

  uint32_t uwCounter = 0;
/* Enable Pixel Clock --------------------------------------------------------*/
  /* Configure PLLSAI prescalers for LCD */
  /* PLLSAI_VCO Input = HSE_VALUE/PLL_M = 1 Mhz */
  /* PLLSAI_VCO Output = PLLSAI_VCO Input * PLLSAI_N = 192 Mhz */
  /* PLLLCDCLK = PLLSAI_VCO Output/PLLSAI_R = 192/3 = 64 Mhz */
  /* LTDC clock frequency = PLLLCDCLK / RCC_PLLSAIDivR = 64/8 = 8 Mhz */
  RCC_PLLSAIConfig(192, 7, 3);
  RCC_LTDCCLKDivConfig(RCC_PLLSAIDivR_Div8);
  
  /* Enable PLLSAI Clock */
  RCC_PLLSAICmd(ENABLE);
  /* Wait for PLLSAI activation */
  while(RCC_GetFlagStatus(RCC_FLAG_PLLSAIRDY) == RESET)
  {
  }
  
/* Enable the LTDC Clock -----------------------------------------------------*/
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_LTDC, ENABLE);
  
/* Configure the LCD Control pins --------------------------------------------*/
  LCD_AF_GPIOConfig();
  
/* Initialize the LCD --------------------------------------------------------*/

  /* Polarity configuration */
  /* Initialize the horizontal synchronization polarity as active low*/
  LTDC_InitStruct.LTDC_HSPolarity = LTDC_HSPolarity_AL;     
  /* Initialize the vertical synchronization polarity as active low */  
  LTDC_InitStruct.LTDC_VSPolarity = LTDC_VSPolarity_AL;     
  /* Initialize the data enable polarity as active low */ 
  LTDC_InitStruct.LTDC_DEPolarity = LTDC_DEPolarity_AL;     
  /* Initialize the pixel clock polarity as input pixel clock */ 
  LTDC_InitStruct.LTDC_PCPolarity = LTDC_PCPolarity_IPC;
  
  /* Timing configuration */
  /* Horizontal synchronization width = Hsync - 1 */     
  LTDC_InitStruct.LTDC_HorizontalSync = 40;
  /* Vertical synchronization height = Vsync - 1 */
  LTDC_InitStruct.LTDC_VerticalSync = 9;
  /* Accumulated horizontal back porch = Hsync + HBP - 1 */
  LTDC_InitStruct.LTDC_AccumulatedHBP = 42; 
  /* Accumulated vertical back porch = Vsync + VBP - 1 */
  LTDC_InitStruct.LTDC_AccumulatedVBP = 11;  
  /* Accumulated active width = Hsync + HBP + Active Width - 1 */  
  LTDC_InitStruct.LTDC_AccumulatedActiveW = 522;
  /* Accumulated active height = Vsync + VBP + Active Heigh - 1 */
  LTDC_InitStruct.LTDC_AccumulatedActiveH = 283;
  /* Total width = Hsync + HBP + Active Width + HFP - 1 */
  LTDC_InitStruct.LTDC_TotalWidth = 524; 
  /* Total height = Vsync + VBP + Active Heigh + VFP - 1 */
  LTDC_InitStruct.LTDC_TotalHeigh = 285;
 
  /* Configure R,G,B component values for LCD background color */                   
  LTDC_InitStruct.LTDC_BackgroundRedValue = 0;            
  LTDC_InitStruct.LTDC_BackgroundGreenValue = 0;          
  LTDC_InitStruct.LTDC_BackgroundBlueValue = 0; 
  
  /* Initialize LTDC */          
  LTDC_Init(&LTDC_InitStruct);

/* LCD initializing end ------------------------------------------------------*/

/* Layer1 Configuration ------------------------------------------------------*/
  
  /* Windowing configuration */ 
  /* In this case only 320x240 window of the active display area is used 
     to display a picture then :
     Horizontal start = horizontal synchronization + Horizontal back porch = 43 
     Vertical start   = vertical synchronization + vertical back porch     = 12
     Horizontal stop = Horizontal start + window width -1 = 43 + 320 -1 
     Vertical stop   = Vertical start + window height -1  = 12 + 240 -1      */ 
  LTDC_Layer_InitStruct.LTDC_HorizontalStart = 43;
  LTDC_Layer_InitStruct.LTDC_HorizontalStop = (320 + 43 - 1); 
  LTDC_Layer_InitStruct.LTDC_VerticalStart = 12;
  LTDC_Layer_InitStruct.LTDC_VerticalStop = (240 + 12 - 1);
  
  /* Pixel Format configuration : indirect color (L8) */           
//.........这里部分代码省略.........

void configureSystem(void) {
	/* SYSCLK, HCLK, PCLK2 and PCLK1 configuration -----------------------------*/
	/* RCC system reset(for debug purpose) */
	RCC_DeInit();

	/* Enable HSE */
	RCC_HSEConfig(RCC_HSE_ON);

	/* Wait till HSE is ready */
	ErrorStatus HSEStartUpStatus = RCC_WaitForHSEStartUp();

	if (HSEStartUpStatus == SUCCESS) {
		/* 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_HCLKConfig(RCC_SYSCLK_Div1);

		/* PCLK2 = HCLK */
		RCC_PCLK2Config(RCC_HCLK_Div1);

		/* PCLK1 = HCLK/2 */
		RCC_PCLK1Config(RCC_HCLK_Div2);

		// PLL configuration: PLLCLK
		/* Configure PLLs *********************************************************/
		/* PLL2 configuration: PLL2CLK = (HSE / 5) * 8 = 40 MHz */
		//RCC_PREDIV2Config(RCC_PREDIV2_Div5);
		//RCC_PLL2Config(RCC_PLL2Mul_8);
		/* PLL2 configuration: PLL2CLK = (HSE / 4) * 20 = 40 MHz */
		RCC_PREDIV2Config(RCC_PREDIV2_Div4);
		RCC_PLL2Config(RCC_PLL2Mul_20);

		// Enable PLL2
		RCC_PLL2Cmd(ENABLE);

		// Wait till PLL2 is ready
		while (RCC_GetFlagStatus(RCC_FLAG_PLL2RDY) == RESET) {
		}

		// PLL configuration: PLLCLK = (PLL2 / 5) * 9 = 72 MHz *
		RCC_PREDIV1Config(RCC_PREDIV1_Source_PLL2, RCC_PREDIV1_Div5);
		RCC_PLLConfig(RCC_PLLSource_PREDIV1, RCC_PLLMul_9);

		/* Enable PLL */
		RCC_PLLCmd(ENABLE);

		/* Wait till PLL is ready */
		while (RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET) {
		}

		/* Select PLL as system clock source */
		RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);

		/* Wait till PLL is used as system clock source */
		while (RCC_GetSYSCLKSource() != 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) {
		}
	}

	rtc_init();

	configureNVIC();

	SysTick_Config(72000);
}