text: /**
    ******************************************************************************
    * @file    WWDG/WWDG_Reset/main.c 
    * @author  MCD Application Team
    * @version V3.5.0
    * @date    08-April-2011
    * @brief   Main program body.
    ******************************************************************************
    * @attention
    *
    * 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 2011 STMicroelectronics</center></h2>
    ******************************************************************************
    */ 
  
  
  /* Includes ------------------------------------------------------------------*/
  #include "stm32f10x.h"
  #include "stm32_eval.h"
  
  /** @addtogroup STM32F10x_StdPeriph_Examples
    * @{
    */
  
  /** @addtogroup WWDG_Reset
    * @{
    */ 
  
  /* Private typedef -----------------------------------------------------------*/
  /* Private define ------------------------------------------------------------*/
  /* Private macro -------------------------------------------------------------*/
  /* Private variables ---------------------------------------------------------*/
  __IO uint32_t TimingDelay = 0;
  
  /* Private function prototypes -----------------------------------------------*/
  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
       */     
  
    /* Initialize LED1 and Key Button mounted on STM3210X-EVAL board */       
    STM_EVAL_LEDInit(LED1);
    STM_EVAL_LEDInit(LED2);
    STM_EVAL_PBInit(BUTTON_KEY, BUTTON_MODE_EXTI);
  
  
    /* Check if the system has resumed from WWDG reset */
    if (RCC_GetFlagStatus(RCC_FLAG_WWDGRST) != RESET)
    { 
      /* WWDGRST flag set */
      /* Turn on LED1 */
      STM_EVAL_LEDOn(LED1);
  
      /* Clear reset flags */
      RCC_ClearFlag();
    }
    else
    {
      /* WWDGRST flag is not set */
      /* Turn off LED1 */
      STM_EVAL_LEDOff(LED1);
    }
  
    /* Setup SysTick Timer for 1 msec interrupts  */
    if (SysTick_Config(SystemCoreClock / 1000))
    { 
      /* Capture error */ 
      while (1);
    }
  
    /* WWDG configuration */
    /* Enable WWDG clock */
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_WWDG, ENABLE);
  
  /* On Value line devices, WWDG clock counter = (PCLK1 (24MHz)/4096)/8 = 732 Hz (~1366 us)  */
  /* On other devices, WWDG clock counter = (PCLK1(36MHz)/4096)/8 = 1099 Hz (~910 us)  */
    WWDG_SetPrescaler(WWDG_Prescaler_8);
  
    /* Set Window value to 80; WWDG counter should be refreshed only when the counter
      is below 80 (and greater than 64) otherwise a reset will be generated */
    WWDG_SetWindowValue(80);
  
    /* - On Value line devices,
      Enable WWDG and set counter value to 127, WWDG timeout = ~1366 us * 64 = 87.42 ms 
      In this case the refresh window is: ~1366us * (127-80) = 64.20 ms < refresh window < ~1366us * 64 = 87.42ms
       - On other devices
      Enable WWDG and set counter value to 127, WWDG timeout = ~910 us * 64 = 58.25 ms 
      In this case the refresh window is: ~910 us * (127-80) = 42.77 ms < refresh window < ~910 us * 64 = 58.25ms     
    */
    WWDG_Enable(127);
     
    while (1)
    {
      /* Toggle LED2 */
      STM_EVAL_LEDToggle(LED2);
  
  #if !defined (STM32F10X_LD_VL) && !defined (STM32F10X_MD_VL) && !defined (STM32F10X_HD_VL) 
      /* Insert 44 ms delay */
      Delay(44);
  #else
      /* Insert 66 ms delay */
      Delay(66);
  #endif    
  
      /* Update WWDG counter */
      WWDG_SetCounter(127);
    }
  }
  
  /**
    * @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 2011 STMicroelectronics *****END OF FILE****/
  