Hi,
I have been evaluating the nRF5340dk for our application purposes and I am currently investigating on how the bluetooth directional finding works.
I happened to encounter an issue with the zephyr and nordic connectionless tx/rx examples, where the transmitter is clearly showing it wants to send AoA/AoD data in the CTE but then on the receiver, there is no data received. After receiving the 5 empty samples, the receiver encounters an error and restarts the program.This seems to be true for both, AoA and AoD modes, please see the program output below.
EDITS FOR TRACKING ISSUE PROGRESS:
- The error it throws is EAGAIN (11), however, that does not still explain why there is no data in the CTE packages?
- The function throwing the error on the cpuapp side is line 304 in hci_core.c: k_sem_take for opcode 0x2053 (HCI enable CTE RX), on cpunet this shows as <err> hci_rpmsg: Command payload length is not correct which is line 67 of main.c in the hci_rpmsg sample application
- The problem is the HCI CTE enable RX command (opcode 0x2053) which should contain 8 bytes in the payload but application core is only sending 6. (10 bytes total, first byte is packet indicator, the following three are header for which opcode is two bytes and the third is the length of parameter and then the rest are the parameter payload bytes).
*** Booting Zephyr OS build v2.7.99-ncs1-7-ga49c0691993c *** Starting Connectionless Locator Demo Bluetooth initialization...success Scan callbacks register...success. Periodic Advertising callbacks register...success. Start scanning...success Waiting for periodic advertising...[DEVICE]: D5:5E:E4:F6:AB:44 (random), AD evt type 3, Tx Pwr: 127, RSSI -80 C:0 S:0 D:0 SR:0 E:0 Prim: LE 1M, Secn: No packets, Interval: 0x0000 (0 ms), SID: 255 [DEVICE]: 1F:C1:8F:39:98:A0 (random), AD evt type 5, Tx Pwr: 127, RSSI -76 Zephyr C:0 S:0 D:0 SR:0 E:1 Prim: LE 1M, Secn: LE 2M, Interval: 0x0780 (2400 ms), SID: 0 success. Found periodic advertising. Creating Periodic Advertising Sync...success. Waiting for periodic sync... PER_ADV_SYNC[0]: [DEVICE]: 1F:C1:8F:39:98:A0 (random) synced, Interval 0x0780 (2400 ms), PHY LE 2M PER_ADV_SYNC[0]: [DEVICE]: 1F:C1:8F:39:98:A0 (random), tx_power 127, RSSI -83, CTE AOD 2 [us], data length 0, data: success. Periodic sync established. Enable receiving of CTE... PER_ADV_SYNC[0]: [DEVICE]: 1F:C1:8F:39:98:A0 (random), tx_power 127, RSSI -83, CTE AOD 2 [us], data length 0, data: PER_ADV_SYNC[0]: [DEVICE]: 1F:C1:8F:39:98:A0 (random), tx_power 127, RSSI -74, CTE AOD 2 [us], data length 0, data: PER_ADV_SYNC[0]: [DEVICE]: 1F:C1:8F:39:98:A0 (random), tx_power 127, RSSI -81, CTE AOD 2 [us], data length 0, data: PER_ADV_SYNC[0]: [DEVICE]: 1F:C1:8F:39:98:A0 (random), tx_power 127, RSSI -74, CTE AOD 2 [us], data length 0, data: ASSERTION FAIL [err == 0] @ WEST_TOPDIR/zephyr/subsys/bluetooth/host/hci_core.c:305 *** Booting Zephyr OS build v2.7.99-ncs1-7-ga49c0691993c ***
