Using RTT with internal Clock

RE: Using RTT with internal Clock

Niclas Heitz — Wed, 30 May 2018 07:39:12 GMT

Ok i got the example running and it worked.

After reviewing the code again i found the error that caused the problem in our code.

Seems to have been a combination of include order and precompile if statements, which resulted in Debug output beeing disabled.

Thanks for your help,

Niclas

RE: Using RTT with internal Clock

bjorn-spockeli — Tue, 29 May 2018 12:14:53 GMT

Yes, make sure that the Log module is enabled and configured for RTT logging in sdk_config.h, see screenshot below. No, I think the precompiled hex enables the UART backend or has logging disabled.

RE: Using RTT with internal Clock

Niclas Heitz — Tue, 29 May 2018 11:55:20 GMT

I tried modifying the ble_app_hrs example myself, but i don't see any RTT output.

I only replaced the NRF_CLOCK_LFCLKSRC with the NRF_CLOCK_LFCLKSRC_RC i posted above.

Is there something else i need to change?

I also tried the ble_app_hrs_pca10040_s132.hex for reference, but there was no RTT ouput either.

Is RTT not enabled in the precompiled hex?

RE: Using RTT with internal Clock

bjorn-spockeli — Mon, 28 May 2018 09:23:47 GMT

I also see the RTT log output in RTT Viewer if I do the same in the ble_app_hrs example in SDK v12.2.0. SO in other words this should work fine. Are you able to reproduce it with a SDK example? I assume that you're seeing this issue with a custom application.

RE: Using RTT with internal Clock

bjorn-spockeli — Mon, 28 May 2018 09:18:33 GMT

From a previous question I see that you're migrating from SDK 12.2.0 to SDK v14.0.0.

I did a quick test in SDK v14.0.0 by modifying the ble_app_hrs example to use the internal RC and not the LFXO and enabling RTT logging I am seeing RTT output in Segger RTT Viewer.

Best regards

Bjørn

RE: Using RTT with internal Clock

Niclas Heitz — Mon, 28 May 2018 09:17:03 GMT

Hi Bjørn,

I am using SDK12.2.0.

I tested it on our custom board and also with the nRF52 DK PCA10040 V1.1.0.

The results were identical.

Thanks,

Niclas

RE: Using RTT with internal Clock

bjorn-spockeli — Mon, 28 May 2018 09:12:08 GMT

Hi Niclas,

which SDK version are you using? Are you using a nRF52 DK or a custom nRF52823 board when you're seeing this issue?

Best regards

Bjørn