libuarte retarget ?

[RixtronixLAB]

Dear Members,

I got this error

.\_build\nrf52840_xxaa.axf: Error: L6218E: Undefined symbol app_uart_put (referred from retarget.o).

SDK_config.h is included,

What's missing from that file ?

1537.sdk_config.h

Thank you

[Vidar Berg]

Hello,

retarget.c is made for the app_uart library, and does not work with libuarte. I suggest you remove retarget.c from your project.

Best regards,

Vidar

[RixtronixLAB]

Hi, Vidar,

Thanks for the reply

Ok, I'll remove it and let's see...

[RixtronixLAB]

Is NRF_LOG_INFO using UART or libuarte on this example ?

E:\nRF5_SDK_17.0.2_d674dde\examples\peripheral\libuarte\main.c

I can not display with NRF_LOG_INFO, and printf too...is it related with retarget.c?

Thanks

[Vidar Berg]

The logger module is configured with the RTT backend because the UARTE0 instance normally used by the UART log backend is assigned to the libuarte driver.

printf's over UART are not supported in this example.

[RixtronixLAB]

how can we print out the debug message then ? thanks

[Vidar Berg]

You can view the logs with Jlink RTT Viewer og Jlink RTT Client: https://www.segger.com/products/debug-probes/j-link/technology/about-real-time-transfer/

[RixtronixLAB]

https://www.segger.com/products/debug-probes/j-link/tools/rtt-viewer/ ?

It's different with serial ?

[RixtronixLAB]

That one ?

[RixtronixLAB]

What's the function for printing message to J-link rttviewer ?