watchdog reset not getting back to main

kalden_srcinc — Fri, 24 Jul 2015 20:52:18 GMT

I have a simple MQX application based on the watchdog example app. I start an MQX task, initialize the watchdog, and then feed it in a loop unless a button is pressed on the board. If I hold the button to force a watchdog reset the watchdog does trigger, but I never get back to my task. Any idea why this would happen? I'm using KSDK 1.2.0 and a TWR-K64F120M. Code below:

void configureWatchdog(int timeoutSeconds)
{
   const uint32_t wdog_clock_hz = 1024;

   const wdog_config_t wdog_config
   {
      .wdogEnable                = true,// Watchdog mode
      .clkSrc                    = kWdogLpoClkSrc, // Watchdog clock source is LPO 1KHz
      .prescaler                 = kWdogClkPrescalerDivide1, // Watchdog clock prescaler
      .workMode =
      {
         .kWdogEnableInWaitMode = true, // Enable watchdog in wait mode
         .kWdogEnableInStopMode = true, // Enable watchdog in stop mode
         .kWdogEnableInDebugMode = false,// Disable watchdog in debug mode
      },
      .updateEnable              = true, // Update register enabled
      .intEnable                 = false,
      .winEnable                 = false, //Disable window function
      .windowValue               = 0,    // Watchdog window value
      .timeoutValue              = timeoutSeconds * wdog_clock_hz,// Watchdog overflow time

   };

   WDOG_DRV_Init(&wdog_config);
}

bool watchdogReboot()
{
   return (RCM->SRS0 & RCM_SRS0_WDOG_MASK) > 0;
}

void Main_Task(uint32_t unused)
{
   _int_install_unexpected_isr();

   for (size_t i = 0; i < PORT_INSTANCE_COUNT; i++)
   {
      CLOCK_SYS_EnablePortClock(i);
   }

   configure_i2s_pins(0);
   configure_i2c_pins(I2C0_IDX);
   /* Init board clock */
   BOARD_ClockInit();

   installIntHandlers();


GPIO_DRV_Init(switchPins, ledPins);

   configureWatchdog(5);
   WDOG_DRV_Refresh();

   printf("\r\n");


   if(watchdogReboot())
   {
      LOG_FATAL("System reboot due to watchdog\n");
   }

   //Periodically feed the watchdog
   uint32_t val = 0;
   while(true)
   {
      OSA_TimeDelay(1000);

      val = (~val) & 0x01;
      GPIO_HAL_WritePinOutput(PTE, 6, val);

      if(GPIO_HAL_ReadPinInput(PTA, 4) != 0)
      {
         printf("feed the dog\n");
         WDOG_DRV_Refresh();
      }
   }
   return;
}

Re: watchdog reset not getting back to main

kalden_srcinc — Mon, 27 Jul 2015 13:20:55 GMT

Turns out, this problem only happens if I'm holding down the SW3 button on the board. If change my main function to never feed the dog, things reset and work as expected. If I hold down the SW3 button, the next time the watchdog triggers it never comes back. I'm not sure why GPIO would impact the watch dog though.

Re: watchdog reset not getting back to main

kalden_srcinc — Mon, 27 Jul 2015 13:45:03 GMT

It looks like SW3 is connected to a pin which is mapped to EZPort_CS by default. I'm guessing that after watchdog reset, holding the button actually tells the MCU to boot in EZ port mode since the pin mux hasn't been configured yet.

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watchdog reset not getting back to main

Re: watchdog reset not getting back to main

Re: watchdog reset not getting back to main