Dear Segger community, I need your help.

I am using J-LINK Commander to exchange data with a Nordic uP. It is working, but too slow. When I am using the "JLinkRTTViewer" tool to exchange data, it is much more faster. I am pretty sure that the BufferSize of the "JLINK_RTTERMINAL_Read" command slow down the process because when I start the process with the commande line : "jlink.exe -device NRF52832_XXAA -speed 2000-if SWD -autoconnect 1", the buffer size is only 0x100



And for the "JLinkRTTViewer" tool it is 0x000FFFFF:



How can I change this buffer size?


I read the manual published here: wiki, and checked and check all commands displayed with "?" command, but I can't figure it out.

Best regards

Thanks you very much for your answer.

I use a simple TelNet to send 1kB packets to the microcontroller. If I send this 1kB with the JLinkRTTViewer tool, the transfert is very quick (less than 0.5 second) on the other side, with a Telnet the transfert takes more than 4 seconds.


The only difference I found between the Telnet and the JLinkRTTViewer tool is the buffer size of the JLINK_RTTERMINAL_Read function : 0x100 againgt 0xFFFFF.


Here is a printsecreen after few seconds (~5s) of Telnet connection. You can see that the number of calls is big.

[img]https://s13.postimg.org/kn81vl353/segger.png[/img]

And here after 2-3 seconds, but with the JLinkRTTViewer tool. The number of calls is less important.

[img]https://s13.postimg.org/pdcbd07c7/segger2.png[/img]

<img src="https://s13.postimg.org/kn81vl353/segger.png" alt="segger.png" title="segger.png" style="font-size: 0.8em;" />


My assumption was to find a way to modify the buffer value without purchasing a SDK. But perhaps am I in a wrong way?


Best regards,


Sébastien

Dear Segger Support,
Please, let me know if my previous post was not enough clear.

Is it possible to modify this buffer value?

Best reagards,

Sébastien

Dear Arne,

Thank you very much to do this change! :thumbsup:

It allowed me to exchange
data between my SEGGER and the chip (Nordic nRF52832) with a good speed which is necessary during the personalization phase of our production process.

BTW, in the beta version I have installed (6.13a) the buffer size is 8kB and not 16kB (0x2000), did you adapt this buffer size?

Not very related, but you should update or remove the JLink commander wiki page because parameters list is not up to date (RTTTelnetport for example) : wiki.segger.com/index.php?title=J-Link_Commander

Best regards,

Sébastien