Direction_finding_Connectionless_rx

[Zack_Lee]

Hi all, i had some problems on showing IQ data. how can i output my IQ values? im using 52833dk. 

[Nathan_INOSI]

Zack,

I have found how to print IQ sample. In main.c, in cte_recv_cb, add the few lignes as show below 

static void cte_recv_cb(struct bt_le_per_adv_sync *sync,
			struct bt_df_per_adv_sync_iq_samples_report const *report)
{
	printk("CTE[%u]: samples count %d, cte type %s, slot durations: %u [us], "
	       "packet status %s, RSSI %i\n",
	       bt_le_per_adv_sync_get_index(sync), report->sample_count,
	       cte_type2str(report->cte_type), report->slot_durations,
	       packet_status2str(report->packet_status), report->rssi);

        printk("IQ sample content : \n");
        for(int i=0; i<report->sample_count; i++){
                printk("sample[%d] = I:%d Q:%d\n", i, report->sample[i].i, report->sample[i].q);
        }
}

Also include bluetooth/hci.h, if not the compiler won't find bt_hci_le_iq_sample struct. You should see the rx controler print IQ value.

PER_ADV_SYNC[0]: [DEVICE]: 23:13:D2:D8:82:4B (random), tx_power 127, RSSI -63, CTE AOA, data length 0, data: 
CTE[0]: samples count 45, cte type AOA, slot durations: 2 [us], packet status CRC OK, RSSI -630
IQ sample content : 
sample[0] = I:5 Q:0
sample[1] = I:-6 Q:-1
sample[2] = I:5 Q:0
sample[3] = I:-6 Q:0
sample[4] = I:5 Q:-1
sample[5] = I:-6 Q:0
sample[6] = I:5 Q:-1
sample[7] = I:-6 Q:0
sample[8] = I:7 Q:8
sample[9] = I:15 Q:20
sample[10] = I:-17 Q:20
sample[11] = I:-4 Q:-5
sample[12] = I:-6 Q:14
sample[13] = I:-14 Q:-2
sample[14] = I:-7 Q:-6
sample[15] = I:-18 Q:-1
sample[16] = I:-1 Q:4
sample[17] = I:-15 Q:9
sample[18] = I:-7 Q:-32
sample[19] = I:4 Q:-11
sample[20] = I:10 Q:-23
sample[21] = I:26 Q:4
sample[22] = I:-3 Q:4
sample[23] = I:16 Q:-2
sample[24] = I:6 Q:12
sample[25] = I:-2 Q:7
sample[26] = I:9 Q:14
sample[27] = I:4 Q:-2
sample[28] = I:14 Q:8
sample[29] = I:-26 Q:20
sample[30] = I:-11 Q:1
sample[31] = I:-26 Q:3
sample[32] = I:-9 Q:-26
sample[33] = I:5 Q:0
sample[34] = I:-10 Q:-13
sample[35] = I:8 Q:-12
sample[36] = I:8 Q:-2
sample[37] = I:9 Q:-15
sample[38] = I:-3 Q:-4
sample[39] = I:-1 Q:-17
sample[40] = I:30 Q:10
sample[41] = I:6 Q:8
sample[42] = I:14 Q:21
sample[43] = I:-18 Q:21
sample[44] = I:-3 Q:-5

Hope it can help. Next step is calculate aoa with those.

Nathan

[Zack_Lee]

Hi Nathan,

thank you for sharing your information!!! great help!