BLE disconnects UART

RE: BLE disconnects UART

Edvin — Fri, 15 Mar 2019 11:16:26 GMT

I really recommend you to get HW that supports debugging. Either another debugger or an nRF52832 DK. You will need this to see what's going on. Alternatively, you can do a sniffer trace using e.g. the nRF Sniffer to see whether the phone actually sends any packets before the timer disconnects, but again, that requires another nRF DK or dongle.

Best regards,

Edvin

RE: BLE disconnects UART

Bruno — Wed, 13 Mar 2019 11:57:15 GMT

thanks for the answer, guys!

According to this, RTT won't work indeed

[quote userid="6462" url="~/f/nordic-q-a/44623/ble-disconnects-uart/175870"]mcuoneclipse.com/.../quote]

But that's nice! I didn't know about this SWO debug either. But, turns out my debug probe doesn't support this debug method. Any tip on how to run that semihosting method? Should I be able to see the printf's messages on eclipse console? That's not happening right now

[/quote]

RE: BLE disconnects UART

awneil — Wed, 13 Mar 2019 10:00:56 GMT

[quote userid="25882" url="~/f/nordic-q-a/44623/ble-disconnects-uart/175755"] I didn't know i could use this J-link RTT Viewer in a PE Micro debug probe[/quote]

I don't think you can?

AIUI, RTT relies upon proprietary features within the JLink?

You would have to use the standard semihosting approach for other debug probes:

http://www.keil.com/support/man/docs/armcc/armcc_pge1358787046598.htm

Or, if your debug probe supports it, use SWO:

https://mcuoneclipse.com/2016/10/17/tutorial-using-single-wire-output-swo-with-arm-cortex-m-and-eclipse/

[quote userid="26071" url="~/f/nordic-q-a/44623/ble-disconnects-uart/175855"]developing without debug possibilities is difficult[/quote]

RE: BLE disconnects UART

Edvin — Wed, 13 Mar 2019 09:38:16 GMT

I can't guarantee that it works, but developing without debug possibilities is difficult. If you can't get any logging information using this, try to set a breakpoint in the error_handler. Just write APP_ERROR_CHECK(1); in your main function, and follow through where it stops (you still need to define DEBUG in your preprocessor defines). At some point, (varying a bit between the SDK versions) this should give a pointer to a file name, line number and error code that was caught in the error handler. Once you find this, remove APP_ERROR_CHECK(1); and see if the error handler catches any other errors.

RE: BLE disconnects UART

Bruno — Tue, 12 Mar 2019 16:38:29 GMT

Thank you very much! I will give it a try and come with an answer! I didn't know i could use this J-link RTT Viewer in a PE Micro debug probe!

RE: BLE disconnects UART

Edvin — Tue, 12 Mar 2019 12:45:00 GMT

Yes. The J-Link RTT Viewer should do. Remember to define DEBUG in your preprocessor defines, so that the error_handler will post the error information in the log.

RE: BLE disconnects UART

Bruno — Tue, 12 Mar 2019 11:44:12 GMT

Oh, i forgot to tell, i'm using SWD debugger, a PE Micro Multilink Universal for flashing the Nina module. Is there any way to debug log using this setup?

RE: BLE disconnects UART

Edvin — Tue, 12 Mar 2019 09:11:34 GMT

Hello,

RTT logging doesn't use the UART, but the debugger. How do you program your NINA B112 module? J-Link programmer? Is it a development kit you are using? Just asking to figure out what logging options you have.

RE: BLE disconnects UART

Bruno — Mon, 11 Mar 2019 17:50:47 GMT

Hi,

Thanks for the reply! I'm using SDK version 15.2. I am currently using a custom board for this application, so i don't know how to debug it with RTT since my Nina's Uart is being used for communicating with MSP.

RE: BLE disconnects UART

Edvin — Mon, 11 Mar 2019 13:45:44 GMT

Hello,

If you have any unexpected behavior, you should try to define DEBUG in your preprocessor defines, and monitor the log (RTT log). Make sure that NRF_LOG is enabled in sdk_config.h. What SDK version are you using?

If you get a log entry saying that it received an error somewhere in the project, what function returned the err_code that was passed into APP_ERROR_CHECK(err_code) that the log is pointing to?

Best regards,

Edvin

RE: BLE disconnects UART

Bruno — Sat, 09 Mar 2019 20:46:38 GMT

Just tried another test. I used the Watchdog example in order to make the module reset, and it worked, now I'm able to reconnect to it. I don't know if it's the best fix i could've done, but if anyone has any clue about what is making this problem I'd be very glad to fix it in a proper way.

RE: BLE disconnects UART

Bruno — Sat, 09 Mar 2019 19:00:19 GMT

I also created a timer to keep track of elapsed time since the device was powered on and as debug purpose i blink a led every second. I manage to get that error again and my suspicious seems to be right: Nina looks freezed (led stopped blinking and was left on) after i lost BLE connection to the Android. Is there any way to fix this problem or any other way to use the NUS/UART (i don't know, maybe i should refresh the BLE connection or something like this) to provent this problem? After getting this error where Nina can't execute any code anymore, the only solution that comes to my mind is to use an external Watchdog and force reset it, but i'd rather fix this on software, Could anyone please help me?

RE: BLE disconnects UART

Bruno — Sat, 09 Mar 2019 02:22:37 GMT

Forget to point that when this connection error occurs my disconnect routine does not work, msp keeps working and Nina doesn't start advertising over again