Angle of arrival application to see switching on nrf52833 board

RE: Angle of arrival application to see switching on nrf52833 board

Louis Chen — Tue, 22 Apr 2025 13:14:55 GMT

Hallo,

I'm facing the same issue you had. Could you let me know how you solved it?

RE: Angle of arrival application to see switching on nrf52833 board

Amanda Hsieh — Mon, 08 Jan 2024 14:34:06 GMT

This case was created two years ago. Please create a support case for your own.

RE: Angle of arrival application to see switching on nrf52833 board

JlaielMS — Mon, 01 Jan 2024 19:39:14 GMT

Hallo,

I'm facing the same issue you had. Could you let me know how you solved it?

RE: Angle of arrival application to see switching on nrf52833 board

yalcinPak — Thu, 28 Jul 2022 20:55:00 GMT

Update: I can see datas as well.

CTE[0]: samples count 45, cte type AOA, slot durations: 2 [us], packet status CRC OK, RSSI -600
IQ sample content :
sample[0] = I:-8 Q:7
sample[1] = I:7 Q:-8
sample[2] = I:-7 Q:7
sample[3] = I:5 Q:-10
sample[4] = I:-5 Q:9
sample[5] = I:5 Q:-10
sample[6] = I:-6 Q:8
sample[7] = I:4 Q:-10
sample[8] = I:-11 Q:-23
sample[9] = I:-33 Q:-25
sample[10] = I:-6 Q:-4
sample[11] = I:-25 Q:-6
sample[12] = I:-42 Q:3
sample[13] = I:-6 Q:0
sample[14] = I:-23 Q:8
sample[15] = I:-29 Q:30
sample[16] = I:-5 Q:4
sample[17] = I:-14 Q:21
sample[18] = I:-6 Q:42
sample[19] = I:-1 Q:6
sample[20] = I:4 Q:24
sample[21] = I:25 Q:34
sample[22] = I:3 Q:5
sample[23] = I:20 Q:15
sample[24] = I:39 Q:10
sample[25] = I:6 Q:1
sample[26] = I:24 Q:3
sample[27] = I:37 Q:-17
sample[28] = I:5 Q:-3
sample[29] = I:18 Q:-16
sample[30] = I:20 Q:-37
sample[31] = I:2 Q:-6
sample[32] = I:5 Q:-25
sample[33] = I:-9 Q:-41
sample[34] = I:-2 Q:-7
sample[35] = I:-11 Q:-23
sample[36] = I:-33 Q:-26
sample[37] = I:-5 Q:-4
sample[38] = I:-24 Q:-10
sample[39] = I:-42 Q:-1
sample[40] = I:-7 Q:0
sample[41] = I:-24 Q:7
sample[42] = I:-30 Q:29
sample[43] = I:-5 Q:4
sample[44] = I:-14 Q:21

RE: Angle of arrival application to see switching on nrf52833 board

yalcinPak — Thu, 28 Jul 2022 19:44:34 GMT

Thank you very much all of you. I can see switching. I was expecting continuous high switching. But now I understood. I can see switching in every 2,4 seconds.

RE: Angle of arrival application to see switching on nrf52833 board

Saleh — Thu, 28 Jul 2022 09:17:30 GMT

Hi,

Can you add these lines to prj.conf file and evaluate the results again?

CONFIG_BT_CTLR_DF=y
CONFIG_BT_CTLR_DF_ANT_SWITCH_RX=y
CONFIG_BT_CTLR_DF_SCAN_CTE_RX=y

-------------------------------------------------------------------------------------------------

There is no overlay-aoa.conf file, by default it will be AoA and switching to AoD needs using an extra overlay file.

-------------------------------------------------------------------------------------------------

And are you sure that you are using correct sampling rates and triggers to see the switching pinouts? You can decrease the periodic interval of transmitter to receive more CTE signals at receiver side (so more switching will be visible) to ensure your chance to visit a change on a pin becomes higher.

RE: Angle of arrival application to see switching on nrf52833 board

yalcinPak — Wed, 27 Jul 2022 22:20:14 GMT

I am using 4 antenna with switching circuit.

My rx configuration is below

nrf52833.overlay

main.c

overlay-aod.conf is coming as a default for rx example. Is it correct? I already tried to change with aoa version(no result).

prj.conf

sample.yaml

My output:

success. Periodic sync established.
Enable receiving of CTE...
success. CTE receive enabled.
Scan disable...Success.
Waiting for periodic sync lost...
CTE[0]: samples count 45, cte type AOA, slot durations: 2 [us], packet status CRC OK, RSSI -550
CTE[0]: samples count 45, cte type AOA, slot durations: 2 [us], packet status CRC OK, RSSI -520
CTE[0]: samples count 45, cte type AOA, slot durations: 2 [us], packet status CRC OK, RSSI -520
CTE[0]: samples count 45, cte type AOA, slot durations: 2 [us], packet status CRC OK, RSSI -520
CTE[0]: samples count 45, cte type AOA, slot durations: 2 [us], packet status CRC OK, RSSI -520
CTE[0]: samples count 45, cte type AOA, slot durations: 2 [us], packet status CRC OK, RSSI -580
CTE[0]: samples count 45, cte type AOA, slot durations: 2 [us], packet status CRC OK, RSSI -520
CTE[0]: samples count 45, cte type AOA, slot durations: 2 [us], packet status CRC OK, RSSI -520
CTE[0]: samples count 45, cte type AOA, slot durations: 2 [us], packet status CRC OK, RSSI -520
CTE[0]: samples count 45, cte type AOA, slot durations: 2 [us], packet status CRC OK, RSSI -520
CTE[0]: samples count 45, cte type AOA, slot durations: 2 [us], packet status CRC OK, RSSI -590

I swill can't see switching on nrf gpio. I would be happy , if you help me to find where is the problem

RE: Angle of arrival application to see switching on nrf52833 board

Amanda Hsieh — Tue, 26 Jul 2022 13:22:22 GMT

Hi,

It requires an antenna board to get antenna switching.

[quote user="yalcinPak"]Secondly I tried with connecting an antenna board with rx board. Again I couldn't see gpio switching , in my rx board.[/quote]

What antenna board are you using? Do you use a Nordic Semiconductor design 12 patch antenna board? If not, do you read Antenna matrix configuration for angle of arrival mode. and update as the documentation suggests?

To successfully use the direction finding locator when the AoA mode is enabled, provide the following data related to antenna matrix design:

Provide the GPIO pins to dfegpio#-gpios properties in nrf52833dk_nrf52833.overlay file

Provide the default antenna that will be used to receive PDU dfe-pdu-antenna property in nrf52833dk_nrf52833.overlay file

Update the antenna switching patterns in ant_patterns array in main.c.

-Amanda

RE: Angle of arrival application to see switching on nrf52833 board

yalcinPak — Tue, 26 Jul 2022 09:29:57 GMT

First I tried without connecting an antenna board with rx board. ( I think I still should be able to see switching gpio3,4,28,29 pins).I can see high or low voltage level on gpio3,4,28,29 according to dfe-pdu-antenna value When I change dfe-pdu-antenna value.

Secondly I tried with connecting an antenna board with rx board. Again I couldn't see gpio switching , in my rx board.

Can I see switching without antenna array?

RE: Angle of arrival application to see switching on nrf52833 board

Amanda Hsieh — Tue, 26 Jul 2022 05:48:40 GMT

Hi,

Do you connect an antenna boar with the rx board? Have a look at Antenna matrix configuration for angle of arrival mode.

-Amanda

RE: Angle of arrival application to see switching on nrf52833 board

yalcinPak — Mon, 25 Jul 2022 14:23:28 GMT

I already have a looked at these two sample. My rx and tx boards are connected each other . I can see data on my terminal. But in my rx board , I couldn't see switching for antenna array.

RE: Angle of arrival application to see switching on nrf52833 board

Amanda Hsieh — Mon, 25 Jul 2022 11:20:43 GMT

Hi,

Please have a look at Bluetooth: Direction finding connectionless locator which provides overlay-aod.conf; overlay-aoa.conf is provided by the Direction finding connectionless beacon sample.

Regards,
Amanda