nrfjprog failure, if connected with two devices and JLinkExe runs

RE: nrfjprog failure, if connected with two devices and JLinkExe runs

defensivesplat — Wed, 14 Mar 2018 17:54:32 GMT

yes, the first device where rtt is started works like expected, but the second one has this described failure.

so i can change the decice, on which i can call nrfjprog without a failure and with failure, by changing the order of the calls jlinkexe/jlinkrttclient.

RE: nrfjprog failure, if connected with two devices and JLinkExe runs

Simen August Tinderholt — Wed, 14 Mar 2018 16:48:25 GMT

Ok, great to know!

Does which device that fails change if you switch up the order you reset / start RTT terminals?

RE: nrfjprog failure, if connected with two devices and JLinkExe runs

defensivesplat — Wed, 14 Mar 2018 16:46:42 GMT

Sorry, I forgot to mention, that I am using Ubuntu 16.04, I have 5 Terminals open: in two of them, I start JLinkExe and in another two, I start JLinkRTTClient -RTTTelnetPort $PORT and in one terminal, I start the nrfjprog command.

RE: nrfjprog failure, if connected with two devices and JLinkExe runs

Simen August Tinderholt — Wed, 14 Mar 2018 16:41:26 GMT

Vidar refers to that each JLink.exe or nrfjprog.exe instance creates a new instance of the jlink library, and a new connection to the programmer.

As he mentions though, that shouldn't be an issue, as multiple connections is supported.

When running those commands, do you run them one after the other in CMD/run, or do you use something to spawn the processes? (Python subprocess fex?)

RE: nrfjprog failure, if connected with two devices and JLinkExe runs

defensivesplat — Wed, 14 Mar 2018 15:28:40 GMT

Thanks for this idea, I tried it, but it didn't solve the problem.

RE: nrfjprog failure, if connected with two devices and JLinkExe runs

Turbo J — Wed, 14 Mar 2018 15:17:16 GMT

RTT could use more than one TCP port, try using -RTTTelnetPort 9201

RE: nrfjprog failure, if connected with two devices and JLinkExe runs

defensivesplat — Wed, 14 Mar 2018 14:21:51 GMT

hi,

the problem is not, that there are multiple jlink instances on one programmer, the problem arises, if I use two PDK boards and start on both the JLinkExe.

I have already downloaded the latest JLink Drivers (v630g), but the problem persists. (I.e. If I connect two boards and start on both of them the JLinkExe, I can't program one of the devices, while the other one works just fine.)

RE: nrfjprog failure, if connected with two devices and JLinkExe runs

Vidar Berg — Wed, 14 Mar 2018 12:58:19 GMT

Hi,

It should be possible to have multiple jlink instances connected to the same programmer, and was unable to reproduce this issue on Windows. Have you tried to use the latest Segger driver: https://www.segger.com/downloads/jlink/?

I guess a possible work-around could be to reset the device from the existing Jlink commander instance instead of opening a new nrfjprog instance.