Direct Test Mode receiver answer

[Pierre cgwi22]

Hello,

We are using nRF52840 with SDK 15.2.0. In our software we have handled the DTM and we are able to send the commands using UART.

We would like to do the receiver test, using another device in transmitter mode, but we do not understand what result we must obtain. When we send the command, the answer is immediately given by the dtm_event_get function with value 0.

How does the receiver test work? How can we see the received data?

Thanks for your help!

[Kenneth]

Håkon is on vacation, so I am taking a look at this case.

Have you taken a look at:
https://infocenter.nordicsemi.com/topic/struct_appnotes/struct/appnotes_nan34.html

This provide an example on how to use DTM in a production setup, including the requird DTM commands to run both TX and RX.

I did make a small modification to the python scripts to show how to perform DTM testing as per Figure 2 (Page 6) of the nAN34_v1.0.pdf show. In essence the modified Python script puts the nRF52-DK (lower tester) to run the receive test only, and analyze and report the results from a DUT in TX only. A small example is also attached how to emulate a DUT for test.

dtm_tester_and_dut_single_channel.zip

The modified example may be closer to what you want.

If you are interested in knowing more of the commands and events you should check out the Bluetooth core specifications, and the "Direct Test Mode" chapter.

Best regards,
Kenneth