main.c

STM32 库文件

/**
  ******************************************************************************
  * @file PWR/STOP/main.c 
  * @author  MCD Application Team
  * @version  V3.0.0
  * @date  04/06/2009
  * @brief  Main program body.
  ******************************************************************************
  * @copy
  *
  * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
  * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
  * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
  * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
  * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
  * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
  *
  * <h2><center>&copy; COPYRIGHT 2009 STMicroelectronics</center></h2>
  */ 

/* Includes ------------------------------------------------------------------*/
#include "stm32f10x.h"
#include "platform_config.h"

/** @addtogroup StdPeriph_Examples
  * @{
  */

/** @addtogroup PWR_STOP
  * @{
  */ 

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
extern __IO uint32_t TimingDelay;
ErrorStatus HSEStartUpStatus;

/* Private function prototypes -----------------------------------------------*/
void SYSCLKConfig_STOP(void);
void RCC_Configuration(void);
void GPIO_Configuration(void);
void EXTI_Configuration(void);
void RTC_Configuration(void);
void NVIC_Configuration(void);
void SysTick_Configuration(void);
void Delay(__IO uint32_t nTime);

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

/**
  * @brief  Main program.
  * @param  None
  * @retval : None
  */
int main(void)
{
  /* Clock configuration */
  RCC_Configuration();

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

  /* GPIO configuration */
  GPIO_Configuration();

  /* Configure EXTI Line to generate an interrupt on falling edge */
  EXTI_Configuration();

  /* Configure RTC clock source and prescaler */
  RTC_Configuration();

  /* NVIC configuration */
  NVIC_Configuration();

  /* Configure the SysTick to generate an interrupt each 1 millisecond */
  SysTick_Configuration();

  /* Turn on led connected to GPIO_LED Pin6 */
  GPIO_SetBits(GPIO_LED, GPIO_Pin_6); 
  
  while (1)
  {
    /* Insert 1.5 second delay */
    Delay(1500);

    /* Wait till RTC Second event occurs */
    RTC_ClearFlag(RTC_FLAG_SEC);
    while(RTC_GetFlagStatus(RTC_FLAG_SEC) == RESET);

    /* Alarm in 3 second */
    RTC_SetAlarm(RTC_GetCounter()+ 3);
    /* Wait until last write operation on RTC registers has finished */
    RTC_WaitForLastTask();

    /* Turn off led connected to GPIO_LED Pin6 */
    GPIO_ResetBits(GPIO_LED, GPIO_Pin_6); 

    /* Request to enter STOP mode with regulator in low power mode*/
    PWR_EnterSTOPMode(PWR_Regulator_LowPower, PWR_STOPEntry_WFI);
    
    /* At this stage the system has resumed from STOP mode -------------------*/
    /* Turn on led connected to GPIO_LED Pin6 */
    GPIO_SetBits(GPIO_LED, GPIO_Pin_6); 

    /* Configures system clock after wake-up from STOP: enable HSE, PLL and select 
       PLL as system clock source (HSE and PLL are disabled in STOP mode) */
    SYSCLKConfig_STOP();
  }
}

/**
  * @brief  Configures the different system clocks.
  * @param  None
  * @retval : None
  */
void RCC_Configuration(void)
{
  /* Setup the microcontroller system. Initialize the Embedded Flash Interface,  
     initialize the PLL and update the SystemFrequency variable. */
  SystemInit();
}

/**
  * @brief  Configures system clock after wake-up from STOP: enable HSE, PLL
  *   and select PLL as system clock source.
  * @param  None
  * @retval : None
  */
void SYSCLKConfig_STOP(void)
{
  /* Enable HSE */
  RCC_HSEConfig(RCC_HSE_ON);

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

  if(HSEStartUpStatus == SUCCESS)
  {
    /* 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)
    {
    }
  }
}

/**
  * @brief  Configures the different GPIO ports.
  * @param  None
  * @retval : None
  */
void GPIO_Configuration(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

  /* Enable Key Button GPIO Port, GPIO_LED and AFIO clock */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIO_KEY_BUTTON | RCC_APB2Periph_GPIO_LED 
                         | RCC_APB2Periph_AFIO, ENABLE);

  /* Configure GPIO_LED Pin 6, Pin 7 and Pin 8 as Output push-pull */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_8;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_Init(GPIO_LED, &GPIO_InitStructure);

  /* Configure Key Button GPIO Pin as input floating */
  GPIO_InitStructure.GPIO_Pin = GPIO_PIN_KEY_BUTTON;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIO_KEY_BUTTON, &GPIO_InitStructure);
}

/**
  * @brief  Configures EXTI Lines.
  * @param  None
  * @retval : None
  */
void EXTI_Configuration(void)
{
  EXTI_InitTypeDef EXTI_InitStructure;

  /* Connect Key Button EXTI Line to Key Button GPIO Pin */
  GPIO_EXTILineConfig(GPIO_PORT_SOURCE_KEY_BUTTON, GPIO_PIN_SOURCE_KEY_BUTTON);

  /* Configure Key Button EXTI Line to generate an interrupt on falling edge */  
  EXTI_InitStructure.EXTI_Line = EXTI_LINE_KEY_BUTTON;
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;
  EXTI_Init(&EXTI_InitStructure);

  /* Configure EXTI Line17(RTC Alarm) to generate an interrupt on rising edge */
  EXTI_ClearITPendingBit(EXTI_Line17);
  EXTI_InitStructure.EXTI_Line = EXTI_Line17;
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
  EXTI_Init(&EXTI_InitStructure);
}

/**
  * @brief  Configures RTC clock source and prescaler.
  * @param  None
  * @retval : None
  */
void RTC_Configuration(void)
{
  /* RTC clock source configuration ------------------------------------------*/
  /* Allow access to BKP Domain */
  PWR_BackupAccessCmd(ENABLE);

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

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

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

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

  /* Set the RTC time base to 1s */
  RTC_SetPrescaler(32767);  
  /* Wait until last write operation on RTC registers has finished */
  RTC_WaitForLastTask();

  /* Enable the RTC Alarm interrupt */
  RTC_ITConfig(RTC_IT_ALR, ENABLE);
  /* Wait until last write operation on RTC registers has finished */
  RTC_WaitForLastTask();
}

/**
  * @brief  Configures NVIC and Vector Table base location.
  * @param  None
  * @retval : None
  */
void NVIC_Configuration(void)
{
  NVIC_InitTypeDef NVIC_InitStructure;

  /* 2 bits for Preemption Priority and 2 bits for Sub Priority */
  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);

  NVIC_InitStructure.NVIC_IRQChannel = RTCAlarm_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

  NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
  NVIC_Init(&NVIC_InitStructure);
}

/**
  * @brief  Configures the SysTick to generate an interrupt each 1 millisecond.
  * @param  None
  * @retval : None
  */
void SysTick_Configuration(void)
{
  /* Setup SysTick Timer for 1 msec interrupts  */
  if (SysTick_Config(SystemFrequency / 1000))
  { 
    /* Capture error */ 
    while (1);
  }
  /* Set SysTick Priority to 3 */
  NVIC_SetPriority(SysTick_IRQn, 0x0C);
}

/**
  * @brief  Inserts a delay time.
  * @param nTime: specifies the delay time length, in milliseconds.
  * @retval : None
  */
void Delay(__IO uint32_t nTime)
{
  TimingDelay = nTime;

  while(TimingDelay != 0);

}

#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

/**
  * @}
  */

/**
  * @}
  */

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