nRF52832 dfu failure, but dfu success when connected customized board with Jlink RTT viewer by jlink(SWD) . How can i solve the bug?

RE: nRF52832 dfu failure, but dfu success when connected customized board with Jlink RTT viewer by jlink(SWD) . How can i solve the bug?

Hung Bui — Wed, 30 Jun 2021 14:46:28 GMT

Hi Sunwell,

Please try to make the sniffer works.
Have you made sure the softdevice is initialized with RC instead of crystal in the bootloader ?
If the board works with other BLE application/example then RC should be fine.

Please try to find a way to debug when not connecting to RTT, for example using UART log, or toggle GPIO pin.

RE: nRF52832 dfu failure, but dfu success when connected customized board with Jlink RTT viewer by jlink(SWD) . How can i solve the bug?

sunwell — Wed, 30 Jun 2021 13:16:27 GMT

Hi Bui,

I've been too busy these two days. And I reply you now.

I have a set of nrf52840 DK. and set up the environment of PC. Flash the sniffer hex file of nrf52840 to nrf52840 also.But I haven't caught the packet yet.

The custom board without 32KHz crystal uses internal RC. I also suspect that it doesn't work properly. I run the same example on the nRF51 DK next days and give you feedback.

If the RC don't work, then what should i do?

thanks.

RE: nRF52832 dfu failure, but dfu success when connected customized board with Jlink RTT viewer by jlink(SWD) . How can i solve the bug?

Hung Bui — Mon, 28 Jun 2021 15:02:50 GMT

Hi Sunwell,
If you have any nRF51 or nRF52 development kit you can use it as a BLE sniffer trace.

Do you have the 32kHz crystal on the custom board ? I suspect that it could be related to the LFCLK , when connecting with RTT it would keep the debuging interface running which keeps the LFCLK running. Could you post the schematic of the custom board ?

If you run the same example on the nRF51 Development Kit do you see the same issue ?

RE: nRF52832 dfu failure, but dfu success when connected customized board with Jlink RTT viewer by jlink(SWD) . How can i solve the bug?

sunwell — Mon, 28 Jun 2021 13:43:09 GMT

Hi Bui,

Thanks a lot.

I am sorrry that i have not a sniffer tace tool.

I have tested that case turned off bluetooth and restart the phone many times.The result is that DFU failure. I added some log states(NRF_LOG_PRINTF()) for debug that bug.

Attached is the RTT log.devzone.nordicsemi.com/.../45565666.log

when the customized board connect RTT logger, the DFU upgrade successfuly each time.

RE: nRF52832 dfu failure, but dfu success when connected customized board with Jlink RTT viewer by jlink(SWD) . How can i solve the bug?

Hung Bui — Mon, 28 Jun 2021 12:57:39 GMT

Hi Sunwell,
Please try to turn off Bluetooth and restart the phone and test again.

Please try capture a sniffer trace for both cases, when you use RTT logger and when you don't use the RTT logger.

Do you have any modification to the bootloader ?
Could you send us the RTT log when you connect RTT logger ?