Problem running code in release mode when NRF_LOG_BACKEND_UART_ENABLED and NRF_LOG are disabled

[JC9191]

Hello,

I am having an issue with running my application in release mode. It will only run when NRF_LOG_ENABLED = 1 and NRF_LOG_BACKEND_UART_ENABLED = 1. I can run my debug configuration with both of these disabled. I would like to disable them as it reduces power consumption of my device. I can run the debugger in the release config and the device will advertise and i can connect to it but it doesn't work when i flash the hex file.

I've tried setting optimization level to 'none' for release build and I've tried disabling and enabling the logs and uart.

Any help with this is appreciated.

Thanks

[Hung Bui]

Hi Jonathan, 
Please let us know what issue you have when you disable the log ? 
Could you debug, either using a debugger or using an GPIO to check where the code get to ? 

For me it could be an HFCLK issue. (both UART and debugger will keep HFCLK running) so you may want to check how you keep/use the HFCLK. Please give more information about your application. 

[JC9191]

Hello,

Thanks for your response.

When i disable the UART and NRF Log I can build the project in release mode but when i flash the hex file the device will not advertise. As soon as i enable the log and UART the device will advertise and behave like normal but draw more power than we would like.

I can run the debugger with the UART and NRF logs disabled and the device advertises as per normal.

I will investigate the HFCLK.

Thanks

[Hung Bui]

Hi again, 
Yes that's why I suggested to use GPIO or otherway of debugging to check where the code stop. Have you tried to do RTT log instead of UART ?

[JC9191]

Hello,

If i enable RTT and NRF Log and disable UART the device will not advertise when I run the code. As soon as i connect to J Link RTT viewer the device starts to advertise. Similarly, if i disable RTT the device won't advertise but it will appear as soon as the RTT viewer is connected.

I can try the GPIO debug method.

Thanks

[Hung Bui]

Please let us know more about your application. Do you see the same problem when testing with our examples ?