freertos with wdt reset problem, nrfjprog

[twittich]

Hello

my setup is a nrf52840, the sdk15.3, Softdevice s140.

I'm running an application with freertos and wdt and have the openbootloader and s140 also flashed.

- if in freertos the wdt is disabled and i set the GPREGRET register and make a reset with NVIC_SystemReset, i have to make a reset from outside by nrfjprog -r over jlink and then the dfu device comes up...

- and after update the device over dfu it has to be reset by nrfjprog -r and it resetarts in application as wanted

- If the wdt is enabled and do the same, set the GPREGRET register and make a reset with NVIC_SystemReset, the device restarts in application....

How can i make a reset or restart similar to nrfjprog -r from software so that no jlink is needed ?

Thanks in advance

twittich

[Vidar Berg]

Hello Twittich,

The WD timer is not reset through a NVIC_SystemReset (Reset behavior) so it will keep running on subsequent startup when the program enters DFU mode inside the bootloader.  The bootloader feeds the WD by default for this reason. But you may need to adjust the reload interval if you have a short timeout, see NRF_BL_WDT_MAX_SCHEDULER_LATENCY_MS in the bootloader's sdk_config.h file. 

[twittich]

Hello

Thank you. This i tested already but it's still the same. While debugging the bootloader at the function

static bool dfu_enter_check(void)

it's not entering in the following

   if (NRF_BL_DFU_ENTER_METHOD_GPREGRET &&
       (nrf_power_gpregret_get() & BOOTLOADER_DFU_START))
    {
        NRF_LOG_DEBUG("DFU mode requested via GPREGRET.");
        return true;
    }

the problem is at

nrf_power_gpregret_get()

i'm not getting 0xb1 .  If I set this hardcoded to 0xb1 it's starting in dfu mode.....

But in the application i'm setting it and then make a reset.

Can I use the sd functions ?

sd_power_gpregret_set(0,0xB1);
sd_nvic_SystemReset();

Or use the GPREGRET2 and change that in the application and bootloader ?

And regarding the reset of the device after the dfu and update, any idea ?

Thank you for any help....

twittich

[twittich]

Yes i know the timer and the use of it.

But i want to use the timer, so that it jumps back to application if no update is started. The wd is now always fed and happy and will not reset the device.

[Vidar Berg]

Ok, but what is NRF_BL_DFU_INACTIVITY_TIMEOUT_MS set to in your bootloader? 

[twittich]

It is now set to 35000.

[Vidar Berg]

Then the program should enter nrf_bootloader.c:inactivity_timeout() after 35 seconds and reset the device. You may place a breakpoint there to confirm. Maybe the problem is that the bootloader enters DFU mode on subsequent startup rather than booting the app? GPREGRET is not cleared through a soft reset, unlike a WD reset. 

[twittich]

Ok i'll test that and look where i should clean it.

But if the GPREGRET is set and the bootloader enters the dfu mode, one of the first things which is done is " dfu_enter_flags_clear(); " so it should be cleared. And if a reset is done after setting the GPREGRET  register and before clearing it should stay in dfu mode after the reset ?