nrf52 require reset form debugger to start

RE: nrf52 require reset form debugger to start

Nguyen Hoan Hoang — Thu, 10 May 2018 14:49:26 GMT

Odd, this doesn't explains why hard reset works in your previous observation. If DC/DC was the cause, it should not work either ways. Have you re-tried without pin reset connected ?

RE: nrf52 require reset form debugger to start

Allen Foster — Thu, 10 May 2018 13:48:36 GMT

We eventually found the problem - which relates to the following.

https://devzone.nordicsemi.com/f/nordic-q-a/28472/automatic-control-of-mode-ldo-and-dcdc

We had a call to sd_power_dcdc_mode_set(NRF_POWER_DCDC_ENABLE); but without the necessary inductors required to make this work on our custom board.

Frustratingly, the custom board started up normally with SDK12 but not with SDK13 if sd_power_dcdc_mode_set(NRF_POWER_DCDC_ENABLE) was called.

Anyway, the boards are now working. Hopefully this is of help to someone else.

RE: nrf52 require reset form debugger to start

Nguyen Hoan Hoang — Wed, 09 May 2018 23:27:59 GMT

The RBP affect softreset only if it is enabled. If not, it is not. Something I noticed. When softdevice is present. The softreset does not seem to work properly. Probably nrfjprog has the same issue.

RE: nrf52 require reset form debugger to start

Allen Foster — Wed, 09 May 2018 23:05:11 GMT

Okay, one interesting thing.

In my makefile at present, after programming I did nrfjprog -f nrf52 --reset and the device will not start.

However if I change this to nrfjprog -f nrf52 --pinreset then the device does start.

It is my understanding the --pinreset is a 'hard' reset whereas --reset is a 'soft' reset

I am beginning to think this might be something related to the RBP (Read Back Protection) on the nRF52. Although I cannot see where I explicitly enable RBP.

RE: nrf52 require reset form debugger to start

Allen Foster — Tue, 08 May 2018 20:32:25 GMT

It is just pulled high at the moment but yes, that is a good idea and I can break it out to the SWD connector. Thanks for responding!

RE: nrf52 require reset form debugger to start

Nguyen Hoan Hoang — Tue, 08 May 2018 20:30:30 GMT

Is that pin configured as reset pin ? If it does, try to connect that to the swd connector to see if that helps.

RE: nrf52 require reset form debugger to start

Allen Foster — Tue, 08 May 2018 20:26:10 GMT

We currently have p21 pulled high with a 10k resistor,

RE: nrf52 require reset form debugger to start

Nguyen Hoan Hoang — Tue, 08 May 2018 19:50:52 GMT

Probably the reset command sequence of the nrfjprog that is different. I guess you don't have the reset pin (p0.21) connected. It would help to have a hardware reset pin.

RE: nrf52 require reset form debugger to start

Allen Foster — Tue, 08 May 2018 12:55:35 GMT

Hi Nguyen,

There is no reference to rdimon or any type of semi-hosting debug. We are building using gcc.

This code works fine on the nRF52-DK but on our chip down solution it has problems. Once programmed, we follow the usual Nordic makefile convention of doing "nrfjprog -f nrf52 --reset" to restart the SoC with the updated application. Oddly this does not cause a restart and to begin execution I need to use JLinkExe to connect and the use 'r' at which point the SoC restarts and execution of the application begins. I cannot understand this issue as I thought nrfjprog was essentially a wrapper around JLinkExe?

RE: nrf52 require reset form debugger to start

Nguyen Hoan Hoang — Tue, 01 May 2018 16:45:08 GMT

Look for rdimon in the linker settings. Remove all of them. rdimon requires the jtag to be connected to start.

RE: nrf52 require reset form debugger to start

Ryan Farrelly — Tue, 01 May 2018 13:09:33 GMT

Hi Hung, did you managed to find a solution to this issue, we are having very similar problems - devzone.nordicsemi.com/.../nrf52-sdk13-reset-issue

RE: nrf52 require reset form debugger to start

Hung Bui — Wed, 10 May 2017 08:41:07 GMT

It's hard to tell what could be wrong here. Please try to follow the debug guide and use UART log if you need to test without the debugger connected.

RE: nrf52 require reset form debugger to start

patlas — Tue, 09 May 2017 16:55:31 GMT

I have tested it on peripheral/serial example application (SDK13) so there is no need to use BLE example. That one works correctly but after moving it into separate directory (get together all necessay files) and change a little bit makefile (which builds correctly whole project) such problem occure.

RE: nrf52 require reset form debugger to start

Hung Bui — Mon, 08 May 2017 08:56:51 GMT

Hi Patlas,

I would suggest to print out debug log to UART to see where the device stuck. You can follow this guide to add a printout or LED toggle in app error handler.

Which example did you test with ? Have you tried BLE example(s) in the SDK ?