Use UART and RTT debug interface on the same time

[chianglin]

Hi,

I had merge UART and RTT  program into the same code.

1. When I use C/C++ compile option "ESB_PRESENT NRF_LOG_USES_RTT=1" to compile my source code , then I can find debug message on "J-Link RTT Viwer", but the UART interface will be crash (Use printf to output some message to UART).

2. If I don't use compile option "ESB_PRESENT NRF_LOG_USES_RTT=1" to compiler code, then UART can work correctly but "J-link Viewer" can not output any thing.

Is it possible use UART and RTT debug interface on the same time?  How can I do this job?

Thank you,

Chianglin

[haakonsh]

Hey Ives,

Concurrent UART and RTT logging is not supported. I can put in a request for such a feature, but I need to know your use case, why do you need to use both backends?

Cheers,

Håkon.

[chianglin]

Hi Håkon,

Thank you for your answer.

My use case is:

1. Use UART to communicate between nRF51822 and Host (ex: Raspberry PI)

2. Use RTT to print debug message.

Can I use these two interface in the same source code?

Thank you,

Chianglin

[awneil]

The NUS examples (in SDK v15.0.0, at least) are using both UART and RTT together fine ...

[chianglin]

Hi awneil,

Thank you for your answer.

Does "51822 version QFAAGO" can use SDK 15.0.0?

Thank you,

Chianglin

[haakonsh]

SDK12.3 is the last SDK to support the nRF51 series. 

[chianglin]

Hi  haakonsh,

Does SDK 12.3  can use both UART and RTT interface at the same time?

Thank you,

Chianglin

[haakonsh]

Yes, but you might need to use the UART driver instead of printf.