I cannot get AOA data in ncs2.4.0 sample: direction_finding_connectionless_rx

[brook]

hardware: DK:
nrf52833dk_nrf52833

ncs:2.4.0

sample: direction_finding_connectionless_rx   

I cannot run into create_sync() after the scan_enable() is runed.

I can find many advertising package. 

[DEVICE]: 41:26:6F:32:02:01 (public), AD evt type 3, Tx Pwr: 127, RSSI -54 C:0 S:0 D:0 SR:0 E:0 Prim: LE 1M, Secn: No packets, Interval: 0x0000 (0 ms), SID: 255

 

but the interval always is 0. and SID always is 255.

I cannot find : success. Periodic sync established.

So, never run to receive CTE.

In the callback for scan : scan_recv().   the condition would never match.

if (!per_adv_found && info->interval != 0)  // so, the code in it would never run.

{

   per_sid = info->sid;   // never run

    k_sem_give();

}

what cause this?

how can I run to get the CTE ?   what requirement we need?

there is a device sending  AOA package always. this package can be received by other products.

thanks.

[Elfving]

Hello,

Are you running the Rx sample along with the tx sample? Are you using an antenna array?

Regards,

Elfving

[brook]

I run without antenna array.
I use two DK (nRF52833).  they are both one antenna.
one DK run 

direction_finding_connectionless_tx

another DK run 

direction_finding_connectionless_rx
I just cannot run out of 

err = k_sem_take(&sem_per_adv, K_FOREVER);

So, I cannot create_sync().

[Elfving]

So of course you wouldn't be able to get any good results without an antenna matrix, but you should be able to get a connection with just the one antenna.

Though I believe you would have to insert a coax swf cable on the antenna connector on J1 for it to work.

Regards,

Elfving

[brook]

absolutely， I get CTE IQ data using the same two DK without antenna matrix .

the Code is Direction Central and peripheral .    

this need central and peripheral is connected.

But,  I need to get CTE IQ data without connect.   I think the antenna is ok (any way, I would not expect to get AOA with one antenna. But I can get some IQ samples.)

I think the code must run into some trouble.

[Elfving]

I am not sure if I understand.

Are you saying that you get this working when using direction_finding_connectionless_tx & direction_finding_connectionless_rx, but with Direction Central and peripheral it does not work?

I believe it should work in the same way on both, in regards to what it is required for it to end up getting CTEs.

Regards,

Elfving

[brook]

Direction Central and peripheral Works WELL!

but,    direction_finding_connectionless_tx & direction_finding_connectionless_rx  FAIL to get IQ samples.

after debug, I find the code stall at  k_sem_take(&sem_per_adv, K_FOREVER);

[Elfving]

And that is also the case with the coax UFL cable connected?

Regards,

Elfving

[brook]

the DK works like this.

[Elfving]

Right. Do you have a coax UFL cable? I don't think it will connect without it inserted.

Regards,

Elfving

[brook]

thanks, Elfving.

but, I think the coax cable make no difference.

for  in the sample of (central and peripheral ).  I did not use coax cable either.

P.S,   who give the interval and SID. the device advertising? 

thanks.

[Elfving]

brook said:

for  in the sample of (central and peripheral ).  I did not use coax cable either.

I just tried it again myself. And yeah for the central and peripheral, it doesn't seem to make a difference there. I do not know why the connectionless samples and the ones with connection work differently in regards to this.

With the connectionless sample though, you do need the SWF cable to break the signal to the internal antenna in order for it to connect. 

Regards,

Elfving