Direct Test Mode over USB with nRF5340DK

[MehdiZ]

Hi,

I'm trying to test DTM over USB CDC with an nRF5340DK unfortunately, Direct Test Mode desktop App is not detecting the DK.

Build command (copied from VSCode output)

west build --build-dir /nRF53/direct_test_mode/build /nRF53/direct_test_mode --pristine --board nrf5340dk_nrf5340_cpunet 
-- -DNCS_TOOLCHAIN_VERSION=NONE -DCONFIG_DEBUG_OPTIMIZATIONS=y 
-DCONFIG_DEBUG_THREAD_INFO=y -DFILE_SUFFIX=usb 

I first run the DTM in UART mode with the DK and it worked as expected.

I also run the cdc_acm sample to confirm that the USB is working on the DK and it's working as expected.

I'm using a Mac(macOS Sequoia 15.3.2), nRF Connect SDK v2.6.0, Direct Test mode app v2.4.2

Can you please help me?

Best regards,

Mehdi

[Amanda Hsieh]

Hi, 

It needs another DK like nRF52DK/nRF52840 DK/nRF52833DK to run the FW for the Direct Test Mode app. See the Bluetooth: Direct Test Mode/Requirements. 

Regards,
Amanda H.

[MehdiZ]

Hi,

I'm sorry but I don't understand your comment.

On the Direct Test Mode app page, it clearly states: 

The application also supports third-party devices that are programmed with 
the DTM standard protocol and expose access to it through a serial port.

And on the Bluetooth: Direct Test Mode/Requirements, it clearly lists the nRF53DK.

And I did the test with the nRF53DK in UART mode and it works fine.

I'm having issues with the USB CDC version of the firmware as described in the same page

Bluetooth: Direct Test Mode/USB CDC ACM transport variant

I built the firmware using the option -DFILE_SUFFIX=usb but I'm not able to see the CDC COM port in the Direct Test Mode app.

Best regards,

Mehdi

[MehdiZ]

Hi,

I followed the same instructions but it's not working on my side. I'm not able to see the USB serial device of the nRF5340DK

Can you please advise on how to debug?

Best regards,

Mehdi

[Amanda Hsieh]

Do you also connect the nRF USB port (J3) to the PC? Also, make sure the USB cable can work and transmit data. 

[MehdiZ]

Yes I connected the nRF USB port. And my USB cable is good. I flashed my DK with the cdc_acm sample and I was able to see the USB serial device.

[Amanda Hsieh]

I'm using a Mac(macOS Sequoia 15.3.2), nRF Connect SDK v2.6.0, Direct Test mode app v2.4.2

Please try NCS v.2.9.1.

[MehdiZ]

Thank you for you help. with NCS v2.9.1 it works.
And I found out why it didn't work with NCS v2.6.0, to activate USB mode in v2.6.0 the command Is different than in  v2.9.1. The correct command is the following.

-DCONFIG_DTM_USB=y