/**
  ******************************************************************************
  * @file    STOP Mode/main.c 
  * @author  MCD Application Team
  * @version V1.0.0
  * @date    09/13/2010
  * @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 2010 STMicroelectronics</center></h2>
  */ 

/* Includes ------------------------------------------------------------------*/
#include "stm32f10x.h"
#include "STM32vldiscovery.h"


/** @addtogroup Examples
  * @{
  */


/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
extern __IO uint32_t TimingDelay;
ErrorStatus HSEStartUpStatus;
__IO uint32_t i=0;
GPIO_InitTypeDef GPIO_InitStructure;

/* Private function prototypes -----------------------------------------------*/
void SYSCLKConfig_STOP(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)
{
  /*!< At this stage the microcontroller clock setting is already configured, 
       this is done through SystemInit() function which is called from startup
       file (startup_stm32f10x_xx.s) before to branch to application main.
       To reconfigure the default setting of SystemInit() function, refer to
       system_stm32f10x.c file
     */     
  
  /* Configure all unused GPIO port pins in Analog Input mode (floating input
     trigger OFF), this will reduce the power consumption and increase the device
     immunity against EMI/EMC *************************************************/
  
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB |
                         RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOD |
                         RCC_APB2Periph_GPIOE, ENABLE);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_All;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
  GPIO_Init(GPIOB, &GPIO_InitStructure);
  GPIO_Init(GPIOC, &GPIO_InitStructure);
  GPIO_Init(GPIOD, &GPIO_InitStructure);
  GPIO_Init(GPIOE, &GPIO_InitStructure);

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB |
                         RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOD |
                         RCC_APB2Periph_GPIOE, DISABLE);  

  /* Initialize LEDs LD3,LD4 and USER Button mounted on STM32VLDISCOVERY board */       
  STM32vldiscovery_LEDInit(LED3);
  STM32vldiscovery_LEDInit(LED4);
  STM32vldiscovery_PBInit(BUTTON_USER, BUTTON_MODE_EXTI);

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

  /* 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 LD3 */
  STM32vldiscovery_LEDOn(LED3);
  
  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 LD3 */
    STM32vldiscovery_LEDOff(LED3);
    /* 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 LD3 */
    STM32vldiscovery_LEDOn(LED3);

    /* 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 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 EXTI Lines.
  * @param  None
  * @retval None
  */
void EXTI_Configuration(void)
{
  EXTI_InitTypeDef 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_Mode = EXTI_Mode_Interrupt;
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;
  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);
}

/**
  * @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(SystemCoreClock / 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 2010 STMicroelectronics *****END OF FILE****/
