nRF Distance measurement using nrf_dm_high_precision_calc()

RE: nRF Distance measurement using nrf_dm_high_precision_calc()

Øivind — Thu, 15 Dec 2022 11:35:09 GMT

Ok, removing the adv_work could work perhaps? I will ask the developer for a suggestion, but that is something to try in the meantime.

RE: nRF Distance measurement using nrf_dm_high_precision_calc()

Miguel Roque — Thu, 15 Dec 2022 00:55:36 GMT

I tried your suggestion but it doesn't seems to work. Without the scan (just in Device A) there is no measurements at all (both side)

RE: nRF Distance measurement using nrf_dm_high_precision_calc()

Øivind — Wed, 14 Dec 2022 14:23:32 GMT

That should be possible, but I don't think it is officially supported. You will need to do this yourself by splitting the sample into two versions. It may be as simple as one versions where you comment out adv_start(), and another where you comment out scan_start() in bt_sync_init() in main.c. I believe the roles are assigned based on the exchange of SCAN_REQ and SCAN_RESP.

RE: nRF Distance measurement using nrf_dm_high_precision_calc()

Miguel Roque — Wed, 14 Dec 2022 13:28:38 GMT

Hi Øivind , thank you for your prompt reply. Yes, I have been able to make it work meanwhile.

Now I have another question, if I understood correctly, the dm module makes has a initial synchronization phase, and after that an initiator requests a distance measurment to the other device who acts as reflector and answers to it with the necessary data. Is it possible to force a device (for instance "DEVICE A") to always be the initiator and the "DEVICE B" to always be the reflector?

RE: nRF Distance measurement using nrf_dm_high_precision_calc()

Øivind — Wed, 14 Dec 2022 12:52:59 GMT

Hi,

High precision calc is not currently supported in the DM sample, as explained by Simon here: RE: Distance Measurement library questions (part 2)

There is a pull request on the github for this feature, so you could try to add support using this: https://github.com/nrfconnect/sdk-nrf/pull/7895

RE: nRF Distance measurement using nrf_dm_high_precision_calc()

Miguel Roque — Tue, 13 Dec 2022 16:55:50 GMT

Update: I increased the MAIN_STACK_SIZE and now I don't have any stack overflow error, however the measurements (in MCPD) is allways 0m for all methods