Unable to run UART BLE app example without debugger

RE: Unable to run UART BLE app example without debugger

kalauffenburger — Wed, 19 Sep 2018 16:05:53 GMT

Never mind, I figured out the issue that I was having.

The problem was that I was calling app_usbd_power_events_enable() before initializing the BLE stack (and therefore before enabling the softdevice).

--ken

RE: Unable to run UART BLE app example without debugger

kalauffenburger — Tue, 18 Sep 2018 19:26:44 GMT

I forgot to mention, I have removed calls to printf() and it still does not work.

RE: Unable to run UART BLE app example without debugger

kalauffenburger — Tue, 18 Sep 2018 19:03:23 GMT

jeremysf,

Were you able to resolve this problem? I am seeing exactly the same problem you describe. I also have a custom hardware and so working with the example application is not easily done without significant reconfiguration.

This problem did not occur using SDK nRF5_SDK_14.2.0_17b948a, but showed up when I ported the code to use SDK nRF5_SDK_15.1.0_a8c0c4d.

I'm not sure how to debug the problem other than using shotgun techniques.

--ken

RE: Unable to run UART BLE app example without debugger

jeremysf — Fri, 24 Aug 2018 17:43:25 GMT

I am having the same issue with my own hardware design. USB CDC works great with the debugger is attached (i.e. JLinkExe is running). I can reset the device, and plug/un-plug the USB cable. When I quit JLinkExe, the USB device is still present and things work. If I unplug and replug the USB cable, (with JLinkExe not running) then there is no discovery.

I did not have retarget.c linked into my project, but I am using SEGGER RTT. I tried to disable logs via setting NRF_LOG_ENABLED to false (and I see no logs) but that had no effect on the issue.

RE: Unable to run UART BLE app example without debugger

jerry2107 — Wed, 15 Aug 2018 10:41:00 GMT

Dear Håkon, thanks for fast answer!

Yes, i faced that problem with putchar, but instead of correct solution i just commented that part (yep, project was not touched, but retarget.c was modified and i forgot about that...).

Once i tried solution from link (proper type for parameter) - its became stable, example works exactly as expected.

Thanks a lot !

RE: Unable to run UART BLE app example without debugger

Håkon Alseth — Wed, 15 Aug 2018 09:12:42 GMT

Hi,

That module looks to have a "full reference design", meaning it has DCDC components, external 32k oscillator.

Do other examples work just fine, for instance ble_app_hrs?

There is a currently known issue with newer versions of SES, and standard functions for input/output:

https://devzone.nordicsemi.com/f/nordic-q-a/34784/conflicting-types-for-_putchar/133776#133776

If you have removed retarget.c from your project, I suspect printf is redirected to a inbuilt debug print instead. This would only work if you enter debug mode. You could try to remove the calls to printf and see if it works better?

Best regards,

Håkon