Zephyr CONFIG_SEGGER_RTT_BUFFER_SIZE_DOWN ignored in 1.6.0

[FusedFET]

Hello,

I have tried to upgrade a working project from ncs 1.5.0 to 1.6.0, which used the shell + console + RTT.

However, long commands (more than 16 chars) seem to be truncated when arriving to the shell interpreter.
I have to enter them in RTT in small chucks to work properly.

I looked a bit into it, and it seems the 

CONFIG_SEGGER_RTT_BUFFER_SIZE_DOWN=2048

configuration I had is beeing ignored in RTT.
By default 16 (BUFFER_SIZE_DOWN) is used (SEGGER_RTT_Conf.h)

Is this a known regression?
Is there a workaround beside changing SEGGER_RTT_Conf?

Sincelry,
Manu

[FusedFET]

A quick followup, I compared the RTT config files of ncs 1.5 and 1.6 and found the issue.
It seems the config has been updated the Zephyr defines not implemented.

On the picture you can see a file version 3.30 which is shipped in 1.6 and the version 2.52h shipped in 1.5.x

[Didrik Rokhaug]

Hi,

Nice job finding the source of the problem.

From what I could find, this is not a known issue, and I will inform the developers.

Best regards,

Didrik

[Didrik Rokhaug]

After talking with the developers, it seems the issue has been fixed in upstream Zephyr.

You can find the relevant commit here: https://github.com/zephyrproject-rtos/zephyr/commit/ad1a5058bb94e6362fa44f05f3ec6cd2914e6036#diff-d7f4082837dc3cb270fcf1abd68188216fdadee294e01611b8ca59ddea7fdbb3

[FusedFET]

Thank you for looking into this!

Have a nice day