CC3220: WatchDog did not trigger

Hi,

Could you try stepping through the reboot function to see if you get stuck before entering hibernate and report back your findings?

Also a small concern of mine is your error checking for sl_Stop. If sl_Stop returns an error (result < 0), you shouldn't ignore that and call sl_Stop again. I recommend you check what your errors are and handle them gracefully to make sure they don't persist after reset. Also, a safer way to check if sl_Stop returns an error is to check for (result < 0) instead of (result != 0).

On a side note, there is a caveats to the WDT where even on a watchdog reset the NWP does not entirely reset. More info in TRM section 10.4.

www.ti.com/.../swru465.pdf

Jesu

Hello!

I tried different duration: 0.5 sec, 1 sec, 2 sec. Voltage is around 0V. But board (my custom board and LP) did not reboots. 

Anyway, i need to reboot board by program command, not using external components.

Hello!

I found the reason of reset fault:

Device hangs in PRCMHibernateCycleTrigger(), after line:

  // Request hibernate.

  PRCMHIBRegWrite((HIB3P3_BASE+HIB3P3_O_MEM_HIB_REQ),0x1);

This happens then UART packet comes until PRCMHibernateCycleTrigger() is executing. 

Then i stop thread, which processes UART packets, when call UART_close(), when disable all PIN interrupts, and only after this call  PRCMHibernateCycleTrigger()  - device do not hangs and i got successful Reset.

But this is not a solution. If PRCMHibernateCycleTrigger() can hang because of UART it can hang because  of other unknown reasons. What is the way to Reboot cc3220 with 100% chance of success?

I tried powerShutdown(), but it also hangs like a PRCMHibernateCycleTrigger().

Hello!
1. In this case, why MCU not entering hibernate after receiving UART packet?

2. I think, it's must be documented. I see only one requirement for PRCMHibernateCycleTrigger() - "call sl_stop()"

3. What is the full list of steps to safe reboot cc3220? Call sl_stop(), close peripherals, what else?

Hello,

Please verify if when you call the PRCMHibernateCycleTrigger function does you get a JTAG disconnect prompt in the CCS console window. If possible share a screenshot of the console log in your response.

Let me know.

Jesu

Hello,

Since you are just using RTC to wake up there's not much to investigate apart from ensuring correct circuit and measuring the clock signal but you need to be careful when probing oscillators. If you do not have the proper equipment and knowledge for measuring oscillators I do not recommend it. 

Try using these driverlib calls instead of PRCMHibernateCycleTrigger that sets up the power manager to wakeup from hibernate every 5 seconds. I just tested it and it worked consistently.

// RTC clk as HIB wakeup source
PRCMHibernateWakeupSourceEnable(PRCM_HIB_SLOW_CLK_CTR);

// set HIB interval to 5 seconds
PRCMHibernateIntervalSet(32768 * 5);

// enter HIB mode
PRCMHibernateEnter();

If it works for you, compare register writes to the reboot function you're using to find the discrepancy or go into the PRCMHibernateCycleTrigger implementation and extend the wakup time to 5 seconds to see if that works too. Let me know what happens.

Jesu