nRF52840 Restarting after DFU

[Ahtasham Baig]

Hi, I am facing an issue my product contains Ble dfu update, I tested my code without enabling DFU and it runs fine ... but after enabling dfu and creating package... I update the device using dfutrg file gets uploaded successful and restart to new firmware version but after 7-8 seconds it restart itself multiple times then SHUTDOWN permanently, Also my code also faces issue on Sending data over ble, at first it sends data without any error and works correctly... Later on it start returning NRF_ERROR_NOT_FOUND from function -> sd_ble_gatts_hvx(conn_handle, &hvx_params);

[Vidar Berg]

Hi,

Please try to debug your application after completing DFU to find out what causes it to reboot. Unexpected resets are usually caused by errors being passed to the APP_ERROR_CHECK() macros in the app (Error module).

Later on it start returning NRF_ERROR_NOT_FOUND from function -> sd_ble_gatts_hvx(conn_handle, &hvx_params);

 Have you made any changes to the initialization of this characteristic since you started getting his error?

[Ahtasham Baig]

Yes I did and tested it using Ble_app_uart and then converted that using Nrf_serial_uarte it was working fine, but my product is build using freeRTOS , in that it is sending data first but later not however it is reading on ble correctly

[Ahtasham Baig]

How can i debugg app after dfu when ever i upload application it goes in dfu trg mode

[Vidar Berg]

You should be able to continue debugging when the bootloader starts the application after the update is complete. I would also recommend you compile your app with the DEBUG flag so you can catch errors before it starts to reboot.

[Ahtasham Baig]

In my sdk configuration i have enabled debug flag but it not showing error by line only showing logs

[Vidar Berg]

Can you post the logs here?