Use dtm via two-wire UART on custom BM833A

Dear Forum,

I have successfully compiled and pretested the direct test mode firmware for SDK_17.0.2.

The UART is shown as /dev/ttyUSB0 in my Ubuntu 20.4 Linux system. Testwise, I also added a printf("Hello world") which I can see when using my com-reader (cutecom, 19200/8N1, /dev/ttyUSB0) and starting the firmware. I then removed the test-"Hello World" again and compiled the firmware and installed it to a BM833A.

I use a UART to USB converter (offering a /dev/ttyUSB0 in my Linux system) for accessing the UART.

Now, I want to use the App "Direct Test Mode v. 2.0.1" from "nRF Connect for Desktop v3.11.0", but:

There is no way to choose a com interface from this app, instead, I only get:

Select Device-->"Connect a "Nordic Development kit" to your computer.

But I want to select a "device that supports 2-wire DTM", which is possible according to that thread:

https://devzone.nordicsemi.com/f/nordic-q-a/81788/dtm-via-nrf-connect-using-a-custom-board

So, what do I need to do to be able to select /dev/ttyUSB0 as 2-wire DTM?

Best regards,

Richard

Related