Application does not start after DFU

[Louis_263]

Hello all,
I have a nrf52820 SoC with which I would like to do a DFU.
When I flash softdevice, application and bootloader together with bootloader settings, the bootloader jumps to the right place in the flash, that is to the application.

If I then switch from the application for the DFU to the bootloader, the DFU is also performed correctly. However, the bootloader does not switch to the application after the DFU.

I attached the log of the DFU.

1805.log_dfu_no_success.txt

It looks like a UART error occurs when trying to write the bootloader settings page. This can be seen clearly in the memory layout:

The left layout is OK and works, the right one is what is there after the DFU and does not work.

Does anyone have a solution for this?

[Sigurd Hellesvik]

Hi,

Can you post the commands you use to perform the DFU?

Regards,
Sigurd Hellesvik

[Louis_263]

Hi,

I have a custom application in which I perform the DFU via a second microcontroller that receives the packets via TCP and forwards them via UART to the nRF52. The UART is configured to 115200 baud and does not use HWFC.... I think an equivalent command would therefore be

nrfutil dfu serial -pkg app_dfu_package.zip -p COMx -b 115200 -fc 0

I have found that after successful DFU, a UART error occurs as confirmed by the log attached in the post (in nrf_dfu_serial_uart line 150). The error handler then causes a system reset. Since the bootloader settings were not completely flashed beforehand, the application will probably not be able to be called from the bootloader. If I comment out the error handler, then everything seems to work as it should.

I get the UART error code 1, do you know what this means?

BR

Louis

[Sigurd Hellesvik]

Hi Louis,

I found another similar case to this:  nRF2810 UART ERROR 1 with DFU

Are you able to find any clues in this case?

Regards,
Sigurd Hellesvik

[Louis_263]

Hi Sigurd,

Unfortunately, I don't think this case will help me.

BR

Louis

[Vidar Berg]

Lets continue the discussion in this thread:  nRF52820 softdevice DFU