WDT triggers DFU exit

RE: WDT triggers DFU exit

Arjun — Wed, 02 Mar 2016 14:00:31 GMT

Great. Thanks!

RE: WDT triggers DFU exit

John — Wed, 02 Mar 2016 12:55:11 GMT

Hi. Sure, I just changed the wait_for_events forever loop to look like:

    static void wait_for_events(void)
{
    for (;;)
    {
		NRF_WDT->RR[0] = WDT_RR_RR_Reload;					// Pat the watchdog
		
        // Wait in low power state for any events.
        uint32_t err_code = sd_app_evt_wait();
        APP_ERROR_CHECK(err_code);

        // Event received. Process it from the scheduler.
        app_sched_execute();

        if ((m_update_status == BOOTLOADER_COMPLETE) || 
            (m_update_status == BOOTLOADER_TIMEOUT)  ||
            (m_update_status == BOOTLOADER_RESET))
        {
			NRF_WDT->RR[0] = WDT_RR_RR_Reload;
            // When update has completed or a timeout/reset occured we will return.
            return;
        }
    }
}

RE: WDT triggers DFU exit

Arjun — Wed, 02 Mar 2016 09:14:47 GMT

Hi John Dewitt, Can you share with me an example of what you did? Thanks for the answer. I think its better to have a WDT handler in the DFU.

RE: WDT triggers DFU exit

Susheel Nuguru — Wed, 02 Mar 2016 09:03:58 GMT

oh yes, i missed to see that. In that case John's suggestion is the only thing that is left as a choice :)

RE: WDT triggers DFU exit

Arjun — Wed, 02 Mar 2016 08:56:27 GMT

It looks like we cannot stop watchdog once enabled. Read in many forums and that seems to be the reason

RE: WDT triggers DFU exit

Susheel Nuguru — Wed, 02 Mar 2016 08:55:16 GMT

wouldn't it be easier to stop the watchdog in this scenario?

RE: WDT triggers DFU exit

John — Tue, 01 Mar 2016 18:04:44 GMT

Hi,

You should check out section 38 of the reference manual for more details. The watchdog timer will remain running through a soft reset, so even if you used a soft reset to get to your bootloader you would have the same issue. I ended up adding a watchdog service to the bootloader to prevent it from interfering with bootloading operations.