关于看门狗使用的问题

你可以调用看门狗的库函数wdogFeed( )进行清狗操作。

为什么在232的看门狗例程中不需要解锁和重新锁定的语句

void
WatchdogIntHandler(void)
{
    //
    // If we have been told to stop feeding the watchdog, return immediately
    // without clearing the interrupt.  This will cause the system to reset
    // next time the watchdog interrupt fires.
    //
    if(!g_bFeedWatchdog)
    {
        return;
    }

    //
    // Clear the watchdog interrupt.
    //
    ROM_WatchdogIntClear(WATCHDOG0_BASE);

    //
    // Invert the GPIO PF3 value.
    //
    ROM_GPIOPinWrite(GPIO_PORTG_BASE, GPIO_PIN_2,
                     (ROM_GPIOPinRead(GPIO_PORTG_BASE, GPIO_PIN_2) ^
                                     GPIO_PIN_2));
}