Thingy:91 resetting periodicly and can not be restore to defaults again

[sy_cratus]

Hi,

I am developing firmware both nrf52 and nrf91. 

in nrf52, I activated BLE, usb and uart. Uart communication established between nrf52 and nrf91.

in nrf91, I activated mcu bootloader, GSM, uart and watchdog timer. 

When I call modem_configuration function, nrf52 started resetting. 

After this step I can not get back the thingy again. I erased NRF91 flash and NRF52 flash, and update modem firmware. 

And I load usb_uart bridge frimware to nrf52. It is resetting all time. I can not find a way to restore the thingy. 

Could anyone help me?

Thanks and Regards

Sezgin

[Kenneth]

I assume you have seen:
https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/ug_thingy91.html#

You may also find precompiled firmware here:
https://www.nordicsemi.com/Software-and-tools/Prototyping-platforms/Nordic-Thingy-91/Download#infotabs 

[sy_cratus]

Hi Kenneth,

Thank you for reply. I already download and load the precompiled firmware. But when I connect thingy to computer via usb, it is resetting periodicly. Hardware version is 1.4.0. Is there any cronic error with the hardware. Because I just load my own code. 

Thanks and Regards 

Sezgin

[Kenneth]

sy_cratus said:

it is resetting periodicly.

How often? Is it continuously, or does it run for some time? Is it the same on a different computer, without USB hub, have you tried to debug the code to find where it may be causing the reset? Tried a different USB cable?

[sy_cratus]

it is 10 seconds. USB connect time is 10 seconds and USB disconnect time is 10 seconds. Computer, programmer DK, usb cables and thingy:91 changed simultaneously.  Me and my friends working on a project and we have same issue with 3 different locations and hardwares. Please check my first messages to see what we activated on the project as a firmware. 

[Kenneth]

It may be related to debug-images have modem tracing enabled, this will make the usb_uart to "crash" due to the high data rate. That is the only thing we can think of that may cause the nRF52 to reset when modem is configuring the nRF91.

The connectivity_bridge should work.