//独立看门口的时钟来源 内部低速时钟 128khz 除以2 即64khz
//选择 IWDG_Prescaler_128
//64/256 =0.5 khz 2ms周期
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#define IWDG_500MS_REST (unsigned char)250
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#define IWDG_400MS_REST (unsigned char)200
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#define IWDG_300MS_REST (unsigned char)150
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#define IWDG_250MS_REST (unsigned char)125
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#define IWDG_200MS_REST (unsigned char)100
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#define IWDG_100MS_REST (unsigned char)50
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#define IWDG_50MS_REST (unsigned char)25
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#define IWDG_4MS_REST (unsigned char)2
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IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);//enable write dog reg
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IWDG_SetPrescaler(IWDG_Prescaler_128);//看门狗预分频
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IWDG_SetReload(IWDG_200MS_REST);//设置看门狗复位时间
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IWDG_Enable();//启动独立看门狗
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IWDG_ReloadCounter();//看门狗复位 正常使用时不想发生看门狗复位，就执行
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