CC3200: System dead-lock after a WD reset, problem with hibernate reset getting stuck.

Hi Ahmad,

Your reset code looks correct. Are you using FreeRTOS?

Jesu

Hi Jesu ,

Yes, I am. 

One correction to the reset code I shared. It does not contain the call HIBEntrePreamble(); 

As I was making changes to make things work, and request for Help I had that line added to my code, from search references. But that function is unresolved and does not exist under my environment. Unfortunately I posted for help before compiling. that line was removed right after the post. sorry for incorrect data there.

Problem still persists, 

As I mentioned , I see this issue more often, when my Application OTA Fails, Sometime after that (undetermined) processor hangs and causes the WD Trigger.

Keep in mind I have seen cases of WD Trigger that result into correct reset handling and the system continues without any problem. But Every Once in a while, the dead-lock Issue happens., where hibernate does not reset the system.

Thanks

Ahmad

Hello everyone,

I'm also having problems with CC3200 hanging during hibernate. Most of the time it works perfectly, but sometimes the SoC hangs after a hibernate cycle request and the watchdog does not reset the system!

Here is the code for our hibernate request:

/*!
 * \brief Reboot the MCU by requesting hibernate for a short duration.
 * \return None
 */
void app_utils_hibernate_cycle (bool slstop, bool signal_fatal_error)
{
	if (signal_fatal_error)
	{
		// Signal fatal error
		LED_set_sys_flag(LED_sys_flags_fatal_error, true);
		vTaskDelay(2000 / portTICK_PERIOD_MS);
		LED_set_sys_flag(LED_sys_flags_off, true);
	}

	taskDISABLE_INTERRUPTS();

	if (slstop)
	{
		sl_Stop(0); // Stop network processing
	}

	Utils_TriggerHibCycle(); // REBOOT !
	
	taskENABLE_INTERRUPTS(); // Should never reach this line
}

void Utils_TriggerHibCycle(void)
{
    //
    // Configure the HIB module RTC wake time
    //
    MAP_PRCMHibernateIntervalSet(330);

    //
    // Enable the HIB RTC
    //
    MAP_PRCMHibernateWakeupSourceEnable(PRCM_HIB_SLOW_CLK_CTR);

    //
    // Enter HIBernate mode
    //
    MAP_PRCMHibernateEnter();
}

Note that we have had problems before where the system hanged during a hibernate request and we assumed that it was because we were getting an UART RX IRQ during the execution of hibernate request routines, so we added a taskDISABLE_INTERRUPTS(); (from FreeRTOS) in order to disable interrupts from hitting during the hibernate request. This seemed to solve the problem back then, but we are experiencing hangs again even after disabling interrupts.

Jesu, can you please elaborate on the fact that WDT does not work on hibernate? How can we recover from a hang if it happens during hibernate request?

Hi Jesu, I don't think this is our problem.

The only moment where we experience a hang is when trying to issue a hibernate cycle.

Also, we don't have a watchdog ISR, we just let it expire twice and reboot the MCU.

We are now thinking that the problem might be with the call to sl_Stop. The problem goes away if we remove it. I opened a new thread to ask about this: e2e.ti.com/.../2825719

Thank you.