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协议栈中如何使用看门狗

如题,我知道在main函数中

#ifdef WDT_IN_PM1
/* If WDT is used, this is a good place to enable it. */
WatchDogEnable( WDTIMX );
#endif

在这里可以打开看门狗,那怎样喂狗呢?把喂狗写在哪里呢?如何在协议栈中能够不断的喂狗??