Direct test mode (DTM) on nRF52840 source code example

[Buttman]

Hello !

I'm currently experimenting with the direct test mode for the nRF52840. I got it up and running with the nRF connect application.

I do however want to run it from SEGGER embedded studios (or any other IDE for that matter) so that I'm able to modify the channels, and channel sweeping in source code, and add
different modifications.

(It is possible for me to modify the the channels etc through the nrRF connect application, but I want to do it through the source code, so I can add more things.)

When I open the direct_test_mode example in <nrf_SDK_17.0.2d674dde>/examples/dtm/direct_test_mode and run it on my nRF52840 DK does it get stuck on the code and doesn't continue:

        if (app_uart_get(&rx_byte) != NRF_SUCCESS)   // <--- here
        {
            // Nothing read from the UART.
            continue;
        }

Where do I specify if the board should be the transceiver or receiver, where do I modify which channel it should transmit or receive on etc?

I have read the documentation about the direct test mode in the SDK doc and the "Setting up producation test using DTM" doc, but it doesn't give me much information about the matter.

BR
Mark

[Jared]

Hi,

Maybe the radio_test example is a better fit for you? The DTM example implements the DTM functions as specified in the BLE spec. The radio test example is much easier to configure and customize. See the radio_cmd.c on how the radio is configured during run time.

regards

Jared 

[Buttman]

My goal is to create interference towards my other node. The purpose with DTM is that it doesn't follow any IEEE 802.15.4 rules. I'm unsure how the radio_test example work, but if it follows the 802.15.4 will it not work as an interference debugger.

[Jared]

Hi,

The radio_test example is a low-level radio example that doesn't follow any specific wireless protocol. I suggest that you check the info slide that I linked in my previous reply and test the example. I don't see any reasons for why the example wouldn't work in your use case.

regards

Jared