看门狗一定要喂狗，喂狗不是要在主程序开头，每一个有while的里面都要有一个，多喂几个
KEIL快捷键https://blog.csdn.net/dddxxxx/article/details/44813135
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stm32看门狗独立窗口初始化
void IWDG_Configuration(void)
{
IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable); //Enable write access to IWDG_PR and IWDG_RLR registers
IWDG_SetPrescaler(IWDG_Prescaler_32);//IWDG counter clock: 40KHz(LSI)/32 = 1.25 KHz (0.8ms)
IWDG_SetReload(2000); //Set counter reload value to 500 (0.4S)(IWDG timeout equal to 400ms)
EWDG_wdi_feed();
IWDG_ReloadCounter(); //Reload IWDG counter
IWDG_Enable(); //Enable IWDG (the LSI oscillator will be enabled by hardware)
}
看现象要把jlink拔下来，还要起始地址是0x8000
