With recent versions of JLinkRTTClient every keyboard input appears doubled. With an older version of the software (6.18d) I do not see this issue. I am seeing this when using RTT with several different SDKs (Nordic nrf5 v12, v15, and zephyr). The behavior is the same with RTT Client + JLinkGDBServer + GDB or JLinkExe + RTT Client. Is there a way to revert to the old behavior without downgrading?
Thank you for your inquiry.
Such an issue is not known to us.
We tried to reproduce the behaviour using an RTT sample in Embedded Studio + RTTClient V6.40 and there was no double echo, see image attached.
Which J-Link software version are you using?
Could you send a screenshot that shows the issue you are seeing?
What are the steps to reproduce the behaviour?
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For the following, I'm using: J-Link tools V6.41a on Ubuntu 18.04
I have reproduced in multiple configurations:
Using a Nordic PCA10040 (nrf52832 dev board) with on-board J-Link, I can erase, start JLinkExe, start JLinkRTTClient, and any input is echoed twice.
More illuminating, if I flash an example from the Nordic nrf sdk based on zephyr, the doubling is present, however command inputs are received correctly.
I have also seen this with the most recent non-beta 6.40 version.
I tried installing J-Link 6.40 on a fresh Ubuntu 18.04.1 VM, this also exhibits the doubling. Going back a few versions, it appears the last working version for me is 6.32i, 6.34 and later show the doubling.