nrf_dm question

[William.wei]

hi support team,

i saw this ticket: Nordic Distance Measurements 

and i am evaluating about how to set measurement very accuractly, for example, i want two measurements in one second.

my questions are:

1. i don't know how to config those "CONFIG_DM_TIMESLOT_QUEUE_COUNT_SAME_PEER" "CONFIG_DM_TIMESLOT_QUEUE_LENGTH" and the start_delay_us parameter of the dm_request structure

2. as my understanding when INITIATOR call dm_request_add in data_cb function and REFLECTOR call dm_request_add adv_scanned_cb, that means sync ends, is this correct?

3. after dm_request_add send,how can i know when the ranging starts?

Regards,

William.

[Simonr]

Hi

Since you generally flash the same sample onto both ends of a distance measurement application the timeslot timings will be the same on both ends, so they agree on the timeslots easily like that.

The NDT is not designed to do ranging for two devices simultaneously, no. As they use synchronization two devices sync up to one another to do the ranging.

Best regards,

Simon

[William.wei]

Thanks simon,

so customer can do ranging from central to periph only, right?

and if we want to range two periphs, customer needs to range them one by one, correct?

Regards,

William.

[Simonr]

Correct. Although either device can act as the central, as explained in the sample overview. But you will indeed need to check the range between devices one by one.

Best regards,

Simon