The nRF Connect Desktop v4.0.0 and Direct Test Mode app v2.0.4 does not work with some USB-UART controller ICs.

[enoch.park]

Deer,

The Direct Test Mode(v2.0.4)  app in nRF connect Desktop(v4.0.0) recognizes COM PORT by the cypress USB-UART controller IC,
but the device selection is not successful and cannot DTM test proceed.

In the previous version(v2.0.3), it was confirmed that it works OK.
nRFgo STUDIO also recognized and operated OK.

I have other USB-UART controller ICs such as FTDI, SiLabs, CMSIS-DAP, etc. were recognized and selected successful.

Please let me know how to downgrade the DTM app within nRF Connect Desktop or how I can work around this.

[enoch.park]

Hi Hieu,

I apologize for the delay in responding.

I have created the logs you requested.
I am also attaching the video of the nRF connect DTM APP working on the computer
and the registry values for the COM port devices.

Hopefully this will resolve issue.

2023-04-20T07_20_08.483Z-log.txt

Fullscreen COM_Registry.txt Download

\HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\COM Name Arbiter\Devices

COM4 Registy value (Cypress USB-UART)
\\?\ports#vid_04b4&pid_0003&mi_00#1&2728ef4&0&00#{86e0d1e0-8089-11d0-9ce4-08003e301f73}
COM23 Registy value (FTDI USB-UART)
\\?\ftdibus#vid_0403+pid_6001+a506zkbea#0000#{86e0d1e0-8089-11d0-9ce4-08003e301f73}

[Hieu]

Hi enoch.park,

I also apologize for my slow response.

I got feedback from our team that it looks like an issue where the app does not handle devices without serial number well. Unfortunately, we don't currently have a workaround for this.

My apology for the inconvenience. I will keep this ticket opened and inform you when a fix or workaround is available, or if the app downgrading feature is released.

Hieu

[Hieu]

Hi enoch.park,

Please be informed that a new version of nRF Connect for Desktop has been released with the downgrade feature. 

You will also need to install another copy of the nRF Connect for Desktop launcher, at the older version that worked with your desired DTM app version.

Here are the steps:

• Update nRF Connect for Desktop to version v4.0.1
• Downgrade the DTM app from nRF Connect for Desktop
• Download the version of the launcher which was used when DTM previously worked for them from https://www.nordicsemi.com/Products/Development-tools/nRF-Connect-for-Desktop/Download#infotabs

Hieu