CLI RTT Monitor Mode Issue

RE: CLI RTT Monitor Mode Issue

Jason Hendrix — Mon, 15 Jan 2018 15:47:39 GMT

Thanks Jakub, that is working so far.

RE: CLI RTT Monitor Mode Issue

Jakub Rzeszutko — Mon, 15 Jan 2018 06:23:54 GMT

I think I have a solution for you. In file: nrf_cli_rtt.c, function: cli_rtt_write you need to remove following code:

if (!(CoreDebug->DHCSR & CoreDebug_DHCSR_C_DEBUGEN_Msk))
    {
        /* If RTT session is not active but RTT console is processed program may stuck.
         * Workaround: If debugger is not connected always return NRF_SUCCESS
         */
         *p_cnt = length;
        return NRF_SUCCESS;
    }

When you will be not using monitor debug mode this code shall be restored.

RE: CLI RTT Monitor Mode Issue

Jason Hendrix — Fri, 12 Jan 2018 19:35:36 GMT

"echo on" has no effect when using MMD. It does work without MMD, so I did learn something new!

RE: CLI RTT Monitor Mode Issue

Jason Hendrix — Fri, 12 Jan 2018 14:25:55 GMT

I can just type "echo on" from PuTTY? When I switch between Debug Terminal and PuTTY, I have to modify the CLI-RTT ECHO_ON_STATUS in sdk_config.h. On for PuTTY, off for Debug Terminal. I'll try "echo on" from the command line.

RE: CLI RTT Monitor Mode Issue

Jakub Rzeszutko — Fri, 12 Jan 2018 13:21:56 GMT

Ok, we will investigate that.

Just to exclude obvious root cause, please send command: "echo on" and check if there is any change.

RE: CLI RTT Monitor Mode Issue

Jason Hendrix — Fri, 12 Jan 2018 13:17:24 GMT

To clarify - I've been using the CLI successfully every day for a couple of months. Mostly from the Debug Terminal, but sometimes from PuTTY. Not simultaneously, of course.

RE: CLI RTT Monitor Mode Issue

Jason Hendrix — Fri, 12 Jan 2018 13:12:36 GMT

Thanks for the response Jakub, but it doesn't it doesn't address my issue, which is that Monitor Mode debugging is suppressing RTT CLI output. I'm not trying to run PuTTY and Debug Terminal simultaneously. Note that I say "Disabling the Debug Terminal and connecting with PuTTY". Both PuTTY and Debug Terminal behaviosr are mentioned just to describe the debugging I've done so far.

RE: CLI RTT Monitor Mode Issue

Jakub Rzeszutko — Fri, 12 Jan 2018 06:43:05 GMT

Hi Jason,

This is a known problem, quote from Segger forum: "The issue is that RTT data can only be grabbed once from J-Link. So when there are multiple terminals "competing" data will be spread or even lost among them."

Easy fix for that is to deactivate RTT via Segger Embedded Studio:

Project settings->Debug->Debugger->RTT Enable-> Set to No

What is more, SES RTT terminal is not handling VT100 commands at all so you need to run PuTTY to use CLI.