//==文件wdog.h============================================================

#ifndef _WDOG_H_
#define _WDOG_H_

#define  	VT_WDG			T_WDG_64MS		
#define		T_WDG_4096MS	   5120
#define		T_WDG_1024MS	   1280
#define		T_WDG_256MS		   320
#define		T_WDG_128MS		   160
#define		T_WDG_64MS			 80
#define		T_WDG16MS				 20

//=================================================
extern void Wdog_Init(void) ;


#endif //


//==文件wdog.c============================================================


//#include "stm32f0xx.h"
#include "global.h" 
#include "wdog.h"

void Wdog_Init(void)
{
  /* 检测系统是否由独立看门狗喂狗复位 */
  if (RCC_GetFlagStatus(RCC_FLAG_IWDGRST) != RESET)
  { 
    /* 清除复位标志位 */
		RCC_ClearFlag();
  }
	
  /* 使能写访问IWDG_PR and IWDG_RLR 寄存器 */
  IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);

  /* IWDG计数器的时钟: LSI/32 */
  IWDG_SetPrescaler(IWDG_Prescaler_32);

  /* 设置重导计数器的值 获得250ms的IWDG超时可以按下面算式计算：  
     Counter Reload Value = 250ms/IWDG counter clock period
                          = 250ms / (LSI/32)
                          = 0.25s / (LsiFreq/32)
                          = LsiFreq/(32 * 4)
                          = LsiFreq/128
   */
//  IWDG_SetReload(LsiFreq/128);
	IWDG_SetReload(VT_WDG);
	
  /* 从新导入IWDG计数器 */
  IWDG_ReloadCounter();

  /* 使能 IWDG (LSI 被硬件使能) */
  IWDG_Enable();

}