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cc2640r2f看门狗问题

我的系统需要常年累月的稳定运行,需要看门狗负责检测系统是否死机,

static void SimpleBLEPeripheral_taskFxn(UArg a0, UArg a1)
{
  ////////////////////////////
    Watchdog_Params params;
    Watchdog_init();
    Watchdog_Params_init(&params);
    params.callbackFxn = (Watchdog_Callback)watchdogCallback;
    params.resetMode = Watchdog_RESET_ON;
    watchdogHandle = Watchdog_open(Board_WATCHDOG0, &params);

  ////////////////////////////
  // Initialize application
  SimpleBLEPeripheral_init();

按照例程,加入了看门狗部分程序,这个看门狗回调函数是干啥用的,是看门狗中断调用还是啥时候调用,我喂狗需要自己操作吗,在定时时间中处理是否有效(也就是死机了就自动复位,我怕在中断中喂狗,即使死机了也不会复位,因为中断优先级高,一直能够进入进行喂狗)?