Now I am using the https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/samples/bluetooth/direction_finding_central/README.html and https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/samples/bluetooth/direction_finding_peripheral/README.html for a direction finding project.
I can run these samples successfully, but I have encountered an issue that confuses me.
I set the switch slot to 2 µs, allowing me to get a CTE with 45 IQ samples. However, the count of the IQ samples drops to 1 when the CRC is not OK. What does this single IQ data mean?
I only encounter this issue in the connection demos. In the connectionless demos, the count of the IQ samples is always 45, regardless of whether the CRC is OK or not.
This seems to indicate that a CTE with a wrong CRC can be used in connectionless demos but not in connection demos, for for greater accuracy in the connection mode, I guess.
Does this difference between connection demos and connectionless demos imply anything else? And why this difference exist?
This is really important to me. Thanks!
Request CTE from peer device... success. CTE request enabled. CTE[E7:8C:85:B4:1C:E6 (random)]: samples count 45, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC OK, RSSI -410 CTE[E7:8C:85:B4:1C:E6 (random)]: samples count 45, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC OK, RSSI -400 CTE[E7:8C:85:B4:1C:E6 (random)]: samples count 45, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC OK, RSSI -450 CTE[E7:8C:85:B4:1C:E6 (random)]: samples count 45, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC OK, RSSI -450 CTE[E7:8C:85:B4:1C:E6 (random)]: samples count 45, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC OK, RSSI -470 CTE[E7:8C:85:B4:1C:E6 (random)]: samples count 45, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC OK, RSSI -480 CTE[E7:8C:85:B4:1C:E6 (random)]: samples count 45, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC OK, RSSI -540 CTE[E7:8C:85:B4:1C:E6 (random)]: samples count 45, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC OK, RSSI -490 CTE[E7:8C:85:B4:1C:E6 (random)]: samples count 45, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC OK, RSSI -540 CTE[E7:8C:85:B4:1C:E6 (random)]: samples count 45, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC OK, RSSI -490 CTE[E7:8C:85:B4:1C:E6 (random)]: samples count 1, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC not OK, CTE Info OK, RSSI -510 CTE[E7:8C:85:B4:1C:E6 (random)]: samples count 1, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC not OK, CTE Info OK, RSSI -510 CTE[E7:8C:85:B4:1C:E6 (random)]: samples count 45, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC OK, RSSI -500 CTE[E7:8C:85:B4:1C:E6 (random)]: samples count 1, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC not OK, CTE Info OK, RSSI -490 CTE[E7:8C:85:B4:1C:E6 (random)]: samples count 45, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC OK, RSSI -490 CTE[E7:8C:85:B4:1C:E6 (random)]: samples count 45, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC OK, RSSI -500 CTE[E7:8C:85:B4:1C:E6 (random)]: samples count 45, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC OK, RSSI -490 CTE[E7:8C:85:B4:1C:E6 (random)]: samples count 45, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC OK, RSSI -510 CTE[E7:8C:85:B4:1C:E6 (random)]: samples count 1, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC not OK, CTE Info OK, RSSI -490 CTE[E7:8C:85:B4:1C:E6 (random)]: samples count 1, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC not OK, CTE Info OK, RSSI -490 CTE[E7:8C:85:B4:1C:E6 (random)]: samples count 45, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC OK, RSSI -570 CTE[E7:8C:85:B4:1C:E6 (random)]: samples count 45, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC OK, RSSI -490 CTE[E7:8C:85:B4:1C:E6 (random)]: samples count 1, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC not OK, CTE Info OK, RSSI -490 CTE[E7:8C:85:B4:1C:E6 (random)]: samples count 1, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC not OK, CTE Info OK, RSSI -490 CTE[E7:8C:85:B4:1C:E6 (random)]: samples count 45, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC OK, RSSI -500 CTE[E7:8C:85:B4:1C:E6 (random)]: samples count 1, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC not OK, CTE Info OK, RSSI -490 CTE[E7:8C:85:B4:1C:E6 (random)]: samples count 1, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC not OK, CTE Info OK, RSSI -490 CTE[E7:8C:85:B4:1C:E6 (random)]: samples count 45, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC OK, RSSI -490 CTE[E7:8C:85:B4:1C:E6 (random)]: samples count 45, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC OK, RSSI -500 CTE[E7:8C:85:B4:1C:E6 (random)]: samples count 1, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC not OK, CTE Info OK, RSSI -500 CTE[E7:8C:85:B4:1C:E6 (random)]: samples count 1, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC not OK, CTE Info OK, RSSI -500 CTE[E7:8C:85:B4:1C:E6 (random)]: samples count 45, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC OK, RSSI -500 CTE[E7:8C:85:B4:1C:E6 (random)]: samples count 45, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC OK, RSSI -490 CTE[E7:8C:85:B4:1C:E6 (random)]: samples count 1, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC not OK, CTE Info OK, RSSI -510 CTE[E7:8C:85:B4:1C:E6 (random)]: samples count 1, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC not OK, CTE Info OK, RSSI -510 CTE[E7:8C:85:B4:1C:E6 (random)]: samples count 1, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC not OK, CTE Info OK, RSSI -520 CTE[E7:8C:85:B4:1C:E6 (random)]: samples count 1, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC not OK, CTE Info OK, RSSI -520 CTE[E7:8C:85:B4:1C:E6 (random)]: samples count 1, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC not OK, CTE Info OK, RSSI -490 CTE[E7:8C:85:B4:1C:E6 (random)]: samples count 45, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC OK, RSSI -490 CTE[E7:8C:85:B4:1C:E6 (random)]: samples count 45, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC OK, RSSI -490 CTE[E7:8C:85:B4:1C:E6 (random)]: samples count 45, cte type AOD 2 [us], slot durations: 2 [us], packet status CRC OK, RSSI -490