Serial port only works when debugging

[keith v]

Custom app running on a nRF52 devboard. Serial port runs when I use the debugger and continues after I exit the debugger, but does not run from a cold start.

using the Nordic UART FIFO code. NRF_LOG_USES_UART=1 and DEBUG are defined in the C preprocessor settings

flow control disabled

Any ideas? Thanks

[FormerMember]

Which version of the SDK do you use? Do you see the same problem if you run one of our examples in the SDK?

[keith v]

oops, SDK 13, S132

If I program an example hex from nrfgo the serial port works fine. I tried the peripheral serial example and the multiprotocol example. I have other projects that work, and Ive been through the #defines.

This is very weird.

[FormerMember]

From SDK 12.0.0, the defines for using logging should be set in sdk_config.h, could you check the log settings in sdk_config.h?

[keith v]

My custom app does not use sdk_config.h like the examples, the defines are set in the compiler definitions.

[FormerMember]

I see. Just for reference, does the UART logging work normally when using one of the examples in the SDK?