How to switch to RTT distance estimation in Nordic sample/demo code? (nRF Connect 1.9.1)

[tonivuc]

Hi

I am testing the new distance estimation techniques introduced in nRF Connect 1.9.0.

I have flashed both of my nRF52833 DK kits with the sample code connected to this post: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.9.1/nrf/samples/bluetooth/nrf_dm/README.html and I can see the default MCPD ranging outputs being printed to my terminal when connected via serial port.

My question is, how can I turn on the Round Trip Time ranging mode provided with the sample code?

In the "Sample output" section it is clearly shown that it is possible.

What I have tried:

In the service_ddfs_init() function inside service.c I tried changing line 147 setting 

ddfs_init.dm_features.ranging_mode_mcpd = 1; to be 0 instead of 1. Then flashing both the cards again. Still get MCPD ranging outputs and not RTT.

This is my first embedded project so I might have missed something obvious.

Thanks for reading!

[Carl Richard]

Hi, Toni!

You can change this in the peer.c file by replacing DM_RANGING_MODE_MCPD on this line with DM_RANGING_MODE_RTT. It's also possible to change this in runtime with the nRF Connect application on your phone using the DDF Service. 

Best regards,
Carl Richard