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Date of registration: May 31st 2017

Posts: 2


Tuesday, June 13th 2017, 3:31pm

[SOLVED] RTT different speed on different channels


I'm using JLinkArm DLL to communicate via RTT with Nordic nRF52 processor. I need to transfer fairly large amount of data from PC to uC.

For that data, I allocated channel 2 (0 is for logging). When using RTT_Read() and RTT_Write() I observed that channel 2 is slow, only writing 1kB of data each 200ms. On RTT channel 0 I can transfer 1kB each 30ms, which is enough for my application.

Is this a limitation in the DLL or the target implementation? How can I enable other RTT channels to work as quickly as channel 0? Ideally I want to use more channels in both directions.


SEGGER - Niklas

Super Moderator

Date of registration: Oct 6th 2014

Posts: 1,691


Tuesday, June 13th 2017, 3:50pm

Hi Filip,

could you please open a ticket by writing a mail to the J-Link support regarding this issue?

Best regards,
Would you like to be added to the J-Link software update notification list, so you get informed automatically when a new version becomes available?
Just write me a PM or in case you want to subscribe to it yourself, please use this link: Link
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Date of registration: May 31st 2017

Posts: 2


Tuesday, June 13th 2017, 4:24pm

Hi Niklas,

thank you for your quick response. I sent the email to the support.

Best regards,