AOA Antenna Switching

[Farsley]

Hello

I am running the nrf/samples/bluetooth/direction_findinding_connectionless_rx App on an nRF52833-DK with nrf Connect SDK 2.2.0

I have set VS Code to use board nrf52833_nrf53833 and configuration to prj.conf

I am running the transmitter code on another board and in the terminal window see:

CTE[0]: samples count 45, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC OK, RSSI -480
CTE[0]: samples count 45, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC OK, RSSI -490
CTE[0]: samples count 45, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC OK, RSSI -500

What I am not seeing is any changes on the antenna switching pins 03,04,28,29 when viewing them with an oscilloscope.

If I change

 dfe-pdu-antenna = <0x0>

to <0x5>

I can see the relevant antenna pins go high on the line:

err = bt_enable(NULL);

but they remain high and do not switch.

In a post similar to this it was suggested adding the following to the prj.conf, but I see no difference:

CONFIG_BT_CTLR_DF=y

CONFIG_BT_CTLR_DF_ANT_SWITCH_RX=y

CONFIG_BT_CTLR_DF_SCAN_CTE_RX=y

Why don't I see the antenna pins switching, Is there some setting I am missing?

Please can you tell me where in the code the antenna switching takes place.

Thank you

[Farsley]

Thank you,
I was just looking at the receive project and forgot about the transmitter and that I had not added the file overlay-aoa.conf to the build fragment.

The clue was there all along in my original post where the receive was getting AOD transmissions:

CTE[0]: samples count 45, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC OK, RSSI -480

[Louis Chen]

Hi Sir,

I have the same problem, but I am in AOA mode. When I modify the PDU antenna, the GPIO will change (H/L), but when I output the IQ sample, GPIO 3/4/28/29 will not switch (H/L). Can you help confirm this?

IQ sample print : 

CTE[0]: samples count 45, cte type AOA, slot durations: 2 [us], packet status CRC OK, RSSI -600

Main.c :

　static const uint8_t ant_patterns[] = { 0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7 };

NRF52833DK_NRF52833.overlay : 

    dfe-antenna-num = <8>;

    dfe-pdu-antenna = <0x0>;

    dfegpio0-gpios = <&gpio0 3 0>;

    dfegpio1-gpios = <&gpio0 4 0>;

    dfegpio2-gpios = <&gpio0 28 0>;

    dfegpio3-gpios = <&gpio0 29 0>;

output files :

.config :

　CONFIG_BT_DF=y

　CONFIG_BT_DF_CONNECTIONLESS_CTE_RX=y

　CONFIG_BT_DF_CTE_RX_AOA=y

　CONFIG_BT_CTLR_DF_CTE_TX_SUPPORT=y

　CONFIG_BT_CTLR_DF_CTE_RX_SUPPORT=y

　CONFIG_BT_CTLR_DF_CTE_RX_SAMPLE_1US_SUPPORT=y

　CONFIG_BT_CTLR_DF_ANT_SWITCH_2US_SUPPORT=y

　CONFIG_BT_CTLR_DF_ANT_SWITCH_1US_SUPPORT=y

　CONFIG_BT_CTLR_CTEINLINE_SUPPORT=y

　CONFIG_BT_CTLR_DF_CTE_TX=y

　CONFIG_BT_CTLR_DF_CTE_RX_SAMPLE_1US=y

　CONFIG_BT_CTLR_DF_ANT_SWITCH_1US=y

　# CONFIG_BT_CTLR_DF_ANT_SWITCH_TX is not set

　CONFIG_BT_CTLR_DF_ANT_SWITCH_RX=y

　CONFIG_BT_CTLR_DF_CTE_RX=y

　CONFIG_BT_CTLR_DF_SCAN_CTE_RX=y

　CONFIG_BT_CTLR_DF_SAMPLE_CTE_FOR_PDU_WITH_BAD_CRC=y

　CONFIG_BT_CTLR_DF_MAX_ANT_SW_PATTERN_LEN=12

　CONFIG_BT_CTLR_DF_INIT_ANT_SEL_GPIOS=y

　CONFIG_BT_CTLR_DF_PER_SCAN_CTE_NUM_MAX=16

zephyr.dts :

        radio: radio@40001000 {

            compatible = "nordic,nrf-radio";

            reg = < 0x40001000 0x1000 >;

            interrupts = < 0x1 0x1 >;

            status = "okay";

            dfe-supported;

            ieee802154-supported;

            ble-2mbps-supported;

            ble-coded-phy-supported;

            tx-high-power-supported;

            dfe-antenna-num = < 0x8 >;

            dfe-pdu-antenna = < 0x0 >;

            dfegpio0-gpios = < &gpio0 0x3 0x0 >;

            dfegpio1-gpios = < &gpio0 0x4 0x0 >;

            dfegpio2-gpios = < &gpio0 0x1c 0x0 >;

            dfegpio3-gpios = < &gpio0 0x1d 0x0 >;

            ieee802154: ieee802154 {

                compatible = "nordic,nrf-ieee802154";

                status = "okay";

            };

        };