Help with the nrf21540 on the nrf5340_audio project

[Glen M]

Hi,

I'm using nRF Connect version 2.9.1 with the buildprog script method of building this project.

I've got some custom boards based on the nRF5340_audio_dk. We swapped out the codec for a stereo one and went to a Fanstel BT40N module for better range, but it doesn't seem like the FEM/amplifier is working right.

Right now I'm handling it by adding --nrf21540 to the end of my buildprog command to tell it that I've got a nrf21540 shield, and then I edited the arduino_compatible.overlay and arduino_compatible_fwd.overlay files (attached) to change up the pinout to match what the BT40N needs. 

It's definitely working better than before I made those changes, but it doesn't seem to be working nearly as well as it should and I'm wondering if the amplifier is the problem.

Should the FEM be fully working with the changes I've made?

Also, even when it works I get a ton of sync errors. See attached debug log.

I'm going to try removing the --nrf21540 and just see what happens when I hardcode the pins to be in a TX or RX configuration - does the BIS broadcaster firmware do any receiving and does the BIS receiver firmware do any transmitting?

Thanks,

Glen

arduino_compatible.overlay

arduino_compatible_fwd.overlay

Fullscreen Receiver_syncproblem_2025_7_15_523pm.txt Download

*** Booting nRF Connect SDK v2.9.1-60d0d6c8d42d ***
*** Using Zephyr OS v3.7.99-ca954a6216c9 ***
[00:00:01.036,041] <inf> fw_info:
         nRF5340 Audio nRF5340 Audio DK cpuapp
         NCS base version: 2.9.1
         Cmake run : Tue Jul 15 11:58:50 2025
[00:00:01.056,518] <inf> bt_hci_core: HW Platform: Nordic Semiconductor (0x0002)
[00:00:01.056,518] <inf> bt_hci_core: HW Variant: nRF53x (0x0003)
[00:00:01.056,549] <inf> bt_hci_core: Firmware: Standard Bluetooth controller (0x00) Version 121.4259
 Build 3078678206
[00:00:01.090,606] <inf> bt_hci_core: Identity: F3:1F:3E:44:97:B6 (random)
[00:00:01.090,637] <inf> bt_hci_core: HCI: version 6.0 (0x0e) revision 0x209a, manufacturer 0x0059
[00:00:01.090,637] <inf> bt_hci_core: LMP: version 6.0 (0x0e) subver 0x209a
[00:00:01.091,003] <inf> bt_mgmt_ctlr_cfg: Controller: SoftDevice: Version 6.0 (0x0e), Revision 8346
[00:00:01.091,156] <inf> bt_mgmt: Local identity addr: F3:1F:3E:44:97:B6 (random)
[00:00:01.092,437] <err> TLV320: GDM cs47l63_comm_init
[00:00:01.092,468] <err> audiocodec: GDM cs47l63_initialize
[00:00:01.092,468] <err> TLV320: GDM cs47l63_comm_gpio_set
[00:00:01.094,543] <err> TLV320: GDM cs47l63_comm_gpio_set
[00:00:01.194,580] <err> TLV320: GDM End of cs47l63_comm_init
[00:00:01.194,610] <err> hw_codec: GDM Soft reset code
[00:00:01.195,831] <inf> bt_mgmt_scan: Local addr: F3:1F:3E:44:97:B6 (random). May time out. Updates
not printed
[00:00:01.195,831] <inf> bt_mgmt_scan: Scanning successfully started
[00:00:02.503,387] <inf> main: PA sync lost, reason: 62
[00:00:02.503,387] <err> main: Failed to restart scanning: -120
[00:00:03.703,857] <inf> bt_mgmt_scan: PA synced to name: NRF5340_BROADCASTER, id: 0x06d1bf, addr: 2C
:87:9B:72:0B:28 (random)
[00:00:04.903,900] <inf> broadcast_sink: Sync with stereo channel
[00:00:04.903,900] <inf> broadcast_sink: Syncing to broadcast stream index 0
[00:00:04.904,083] <err> audio_system: GDM Decoder sample rate 48000
[00:00:04.904,083] <inf> main: Presentation delay 3000 us is set
[00:00:06.158,142] <wrn> bt_conn: conn 0x20003660 failed to establish. RF noise?
[00:00:06.158,172] <inf> broadcast_sink: Stream sync lost
[00:00:06.158,203] <inf> broadcast_sink: Stream index 0 stopped. Reason: 62
[00:00:06.158,203] <wrn> bt_conn: conn 0x20003730 failed to establish. RF noise?
[00:00:06.158,233] <inf> broadcast_sink: Stream sync lost
[00:00:06.158,264] <inf> broadcast_sink: Stream index 0 stopped. Reason: 62
[00:00:06.158,355] <inf> main: Sync lost
[00:00:06.158,752] <inf> main: PA sync lost, reason: 22
[00:00:06.159,576] <inf> bt_mgmt_scan: Local addr: F3:1F:3E:44:97:B6 (random). May time out. Updates
not printed
[00:00:06.159,606] <inf> bt_mgmt_scan: Scanning successfully started
[00:00:06.159,606] <inf> main: Restarted scanning for broadcaster
[00:00:06.159,606] <inf> main: Sync lost
[00:00:06.159,637] <wrn> main: PA sync is NULL
[00:00:06.159,973] <wrn> bt_hci_core: opcode 0x2045 status 0x0c
[00:00:06.159,973] <err> bt_mgmt: Failed to delete PA sync
[00:00:06.159,973] <wrn> main: Failed to delete PA sync -13
[00:00:06.161,132] <inf> bt_mgmt_scan: Local addr: F3:1F:3E:44:97:B6 (random). May time out. Updates
not printed
[00:00:06.161,132] <inf> bt_mgmt_scan: Scanning successfully started
[00:00:06.161,132] <inf> main: Restarted scanning for broadcaster
[00:00:07.503,906] <inf> bt_mgmt_scan: PA synced to name: NRF5340_BROADCASTER, id: 0x06d1bf, addr: 2C
:87:9B:72:0B:28 (random)
[00:00:08.103,912] <inf> broadcast_sink: Sync with stereo channel
[00:00:08.103,912] <inf> broadcast_sink: Syncing to broadcast stream index 0
[00:00:08.104,064] <err> audio_system: GDM Decoder sample rate 48000
[00:00:08.104,064] <inf> main: Presentation delay 3000 us is set
[00:00:09.958,160] <wrn> bt_conn: conn 0x20003660 failed to establish. RF noise?
[00:00:09.958,190] <inf> broadcast_sink: Stream sync lost
[00:00:09.958,221] <inf> broadcast_sink: Stream index 0 stopped. Reason: 62
[00:00:09.958,221] <wrn> bt_conn: conn 0x20003730 failed to establish. RF noise?
[00:00:09.958,251] <inf> broadcast_sink: Stream sync lost
[00:00:09.958,282] <inf> broadcast_sink: Stream index 0 stopped. Reason: 62
[00:00:09.958,374] <inf> main: Sync lost
[00:00:09.958,770] <inf> main: PA sync lost, reason: 22
[00:00:09.959,594] <inf> bt_mgmt_scan: Local addr: F3:1F:3E:44:97:B6 (random). May time out. Updates
not printed
[00:00:09.959,625] <inf> bt_mgmt_scan: Scanning successfully started
[00:00:09.959,625] <inf> main: Restarted scanning for broadcaster
[00:00:09.959,625] <inf> main: Sync lost
[00:00:09.959,655] <wrn> main: PA sync is NULL
[00:00:09.959,991] <wrn> bt_hci_core: opcode 0x2045 status 0x0c
[00:00:09.959,991] <err> bt_mgmt: Failed to delete PA sync
[00:00:09.959,991] <wrn> main: Failed to delete PA sync -13
[00:00:09.961,151] <inf> bt_mgmt_scan: Local addr: F3:1F:3E:44:97:B6 (random). May time out. Updates
not printed
[00:00:09.961,151] <inf> bt_mgmt_scan: Scanning successfully started
[00:00:09.961,151] <inf> main: Restarted scanning for broadcaster
[00:00:11.303,405] <inf> main: PA sync lost, reason: 62
[00:00:11.303,436] <err> main: Failed to restart scanning: -120
[00:00:12.503,906] <inf> bt_mgmt_scan: PA synced to name: NRF5340_BROADCASTER, id: 0x06d1bf, addr: 2C
:87:9B:72:0B:28 (random)
[00:00:13.103,942] <inf> broadcast_sink: Sync with stereo channel
[00:00:13.103,942] <inf> broadcast_sink: Syncing to broadcast stream index 0
[00:00:13.104,095] <err> audio_system: GDM Decoder sample rate 48000
[00:00:13.104,095] <inf> main: Presentation delay 3000 us is set
[00:00:15.558,197] <wrn> bt_conn: conn 0x20003660 failed to establish. RF noise?
[00:00:15.558,197] <inf> broadcast_sink: Stream sync lost
[00:00:15.558,258] <inf> broadcast_sink: Stream index 0 stopped. Reason: 62
[00:00:15.558,258] <wrn> bt_conn: conn 0x20003730 failed to establish. RF noise?
[00:00:15.558,288] <inf> broadcast_sink: Stream sync lost
[00:00:15.558,319] <inf> broadcast_sink: Stream index 0 stopped. Reason: 62
[00:00:15.558,410] <inf> main: Sync lost
[00:00:15.558,807] <inf> main: PA sync lost, reason: 22
[00:00:15.559,631] <inf> bt_mgmt_scan: Local addr: F3:1F:3E:44:97:B6 (random). May time out. Updates
not printed
[00:00:15.559,631] <inf> bt_mgmt_scan: Scanning successfully started
[00:00:15.559,661] <inf> main: Restarted scanning for broadcaster
[00:00:15.559,661] <inf> main: Sync lost
[00:00:15.559,661] <wrn> main: PA sync is NULL
[00:00:15.560,028] <wrn> bt_hci_core: opcode 0x2045 status 0x0c
[00:00:15.560,028] <err> bt_mgmt: Failed to delete PA sync
[00:00:15.560,028] <wrn> main: Failed to delete PA sync -13
[00:00:15.561,187] <inf> bt_mgmt_scan: Local addr: F3:1F:3E:44:97:B6 (random). May time out. Updates
not printed
[00:00:15.561,187] <inf> bt_mgmt_scan: Scanning successfully started
[00:00:15.561,187] <inf> main: Restarted scanning for broadcaster
[00:00:16.503,936] <inf> bt_mgmt_scan: PA synced to name: NRF5340_BROADCASTER, id: 0x06d1bf, addr: 2C
:87:9B:72:0B:28 (random)
[00:00:17.703,948] <inf> broadcast_sink: Sync with stereo channel
[00:00:17.703,948] <inf> broadcast_sink: Syncing to broadcast stream index 0
[00:00:17.704,132] <err> audio_system: GDM Decoder sample rate 48000
[00:00:17.704,132] <inf> main: Presentation delay 3000 us is set
[00:00:20.758,209] <wrn> bt_conn: conn 0x20003660 failed to establish. RF noise?
[00:00:20.758,239] <inf> broadcast_sink: Stream sync lost
[00:00:20.758,270] <inf> broadcast_sink: Stream index 0 stopped. Reason: 62
[00:00:20.758,270] <wrn> bt_conn: conn 0x20003730 failed to establish. RF noise?
[00:00:20.758,300] <inf> broadcast_sink: Stream sync lost
[00:00:20.758,361] <inf> broadcast_sink: Stream index 0 stopped. Reason: 62
[00:00:20.758,422] <inf> main: Sync lost
[00:00:20.758,850] <inf> main: PA sync lost, reason: 22
[00:00:20.759,674] <inf> bt_mgmt_scan: Local addr: F3:1F:3E:44:97:B6 (random). May time out. Updates
not printed
[00:00:20.759,674] <inf> bt_mgmt_scan: Scanning successfully started
[00:00:20.759,674] <inf> main: Restarted scanning for broadcaster
[00:00:20.759,704] <inf> main: Sync lost
[00:00:20.759,704] <wrn> main: PA sync is NULL
[00:00:20.760,040] <wrn> bt_hci_core: opcode 0x2045 status 0x0c
[00:00:20.760,040] <err> bt_mgmt: Failed to delete PA sync
[00:00:20.760,040] <wrn> main: Failed to delete PA sync -13
[00:00:20.761,199] <inf> bt_mgmt_scan: Local addr: F3:1F:3E:44:97:B6 (random). May time out. Updates
not printed
[00:00:20.761,230] <inf> bt_mgmt_scan: Scanning successfully started
[00:00:20.761,230] <inf> main: Restarted scanning for broadcaster
[00:00:21.503,967] <inf> bt_mgmt_scan: PA synced to name: NRF5340_BROADCASTER, id: 0x06d1bf, addr: 2C
:87:9B:72:0B:28 (random)
[00:00:22.103,973] <inf> broadcast_sink: Sync with stereo channel
[00:00:22.103,973] <inf> broadcast_sink: Syncing to broadcast stream index 0
[00:00:22.104,156] <err> audio_system: GDM Decoder sample rate 48000
[00:00:22.104,156] <inf> main: Presentation delay 3000 us is set
[00:00:22.758,239] <wrn> bt_conn: conn 0x20003660 failed to establish. RF noise?
[00:00:22.758,239] <inf> broadcast_sink: Stream sync lost
[00:00:22.758,300] <inf> broadcast_sink: Stream index 0 stopped. Reason: 62
[00:00:22.758,300] <wrn> bt_conn: conn 0x20003730 failed to establish. RF noise?
[00:00:22.758,331] <inf> broadcast_sink: Stream sync lost
[00:00:22.758,361] <inf> broadcast_sink: Stream index 0 stopped. Reason: 62
[00:00:22.758,453] <inf> main: Sync lost
[00:00:22.758,850] <inf> main: PA sync lost, reason: 22
[00:00:22.759,674] <inf> bt_mgmt_scan: Local addr: F3:1F:3E:44:97:B6 (random). May time out. Updates
not printed
[00:00:22.759,674] <inf> bt_mgmt_scan: Scanning successfully started
[00:00:22.759,704] <inf> main: Restarted scanning for broadcaster
[00:00:22.759,704] <inf> main: Sync lost
[00:00:22.759,704] <wrn> main: PA sync is NULL
[00:00:22.760,040] <wrn> bt_hci_core: opcode 0x2045 status 0x0c
[00:00:22.760,070] <err> bt_mgmt: Failed to delete PA sync
[00:00:22.760,070] <wrn> main: Failed to delete PA sync -13
[00:00:22.761,230] <inf> bt_mgmt_scan: Local addr: F3:1F:3E:44:97:B6 (random). May time out. Updates
not printed
[00:00:22.761,230] <inf> bt_mgmt_scan: Scanning successfully started
[00:00:22.761,230] <inf> main: Restarted scanning for broadcaster
[00:00:23.903,717] <inf> main: PA sync lost, reason: 62
[00:00:23.903,747] <err> main: Failed to restart scanning: -120
[00:00:24.503,997] <inf> bt_mgmt_scan: PA synced to name: NRF5340_BROADCASTER, id: 0x06d1bf, addr: 2C
:87:9B:72:0B:28 (random)
[00:00:25.704,010] <inf> broadcast_sink: Sync with stereo channel
[00:00:25.704,010] <inf> broadcast_sink: Syncing to broadcast stream index 0
[00:00:25.704,162] <err> audio_system: GDM Decoder sample rate 48000
[00:00:25.704,162] <inf> main: Presentation delay 3000 us is set
[00:00:29.358,276] <wrn> bt_conn: conn 0x20003660 failed to establish. RF noise?
[00:00:29.358,276] <inf> broadcast_sink: Stream sync lost
[00:00:29.358,337] <inf> broadcast_sink: Stream index 0 stopped. Reason: 62
[00:00:29.358,337] <wrn> bt_conn: conn 0x20003730 failed to establish. RF noise?
[00:00:29.358,367] <inf> broadcast_sink: Stream sync lost
[00:00:29.358,398] <inf> broadcast_sink: Stream index 0 stopped. Reason: 62
[00:00:29.358,489] <inf> main: Sync lost
[00:00:29.358,886] <inf> main: PA sync lost, reason: 22
[00:00:29.359,710] <inf> bt_mgmt_scan: Local addr: F3:1F:3E:44:97:B6 (random). May time out. Updates
not printed
[00:00:29.359,710] <inf> bt_mgmt_scan: Scanning successfully started
[00:00:29.359,741] <inf> main: Restarted scanning for broadcaster
[00:00:29.359,741] <inf> main: Sync lost
[00:00:29.359,741] <wrn> main: PA sync is NULL
[00:00:29.360,076] <wrn> bt_hci_core: opcode 0x2045 status 0x0c
[00:00:29.360,107] <err> bt_mgmt: Failed to delete PA sync
[00:00:29.360,107] <wrn> main: Failed to delete PA sync -13
[00:00:29.361,267] <inf> bt_mgmt_scan: Local addr: F3:1F:3E:44:97:B6 (random). May time out. Updates
not printed
[00:00:29.361,267] <inf> bt_mgmt_scan: Scanning successfully started
[00:00:29.361,267] <inf> main: Restarted scanning for broadcaster
[00:00:30.703,491] <inf> main: PA sync lost, reason: 62
[00:00:30.703,491] <err> main: Failed to restart scanning: -120
[00:00:31.504,028] <inf> bt_mgmt_scan: PA synced to name: NRF5340_BROADCASTER, id: 0x06d1bf, addr: 2C
:87:9B:72:0B:28 (random)
[00:00:32.704,040] <inf> broadcast_sink: Sync with stereo channel
[00:00:32.704,040] <inf> broadcast_sink: Syncing to broadcast stream index 0
[00:00:32.704,193] <err> audio_system: GDM Decoder sample rate 48000
[00:00:32.704,193] <inf> main: Presentation delay 3000 us is set
[00:00:33.958,282] <wrn> bt_conn: conn 0x20003660 failed to establish. RF noise?
[00:00:33.958,312] <inf> broadcast_sink: Stream sync lost
[00:00:33.958,343] <inf> broadcast_sink: Stream index 0 stopped. Reason: 62
[00:00:33.958,343] <wrn> bt_conn: conn 0x20003730 failed to establish. RF noise?
[00:00:33.958,374] <inf> broadcast_sink: Stream sync lost
[00:00:33.958,404] <inf> broadcast_sink: Stream index 0 stopped. Reason: 62
[00:00:33.958,496] <inf> main: Sync lost
[00:00:33.958,923] <inf> main: PA sync lost, reason: 22
[00:00:33.959,747] <inf> bt_mgmt_scan: Local addr: F3:1F:3E:44:97:B6 (random). May time out. Updates
not printed
[00:00:33.959,747] <inf> bt_mgmt_scan: Scanning successfully started
[00:00:33.959,747] <inf> main: Restarted scanning for broadcaster
[00:00:33.959,777] <inf> main: Sync lost
[00:00:33.959,777] <wrn> main: PA sync is NULL
[00:00:33.960,113] <wrn> bt_hci_core: opcode 0x2045 status 0x0c
[00:00:33.960,113] <err> bt_mgmt: Failed to delete PA sync
[00:00:33.960,113] <wrn> main: Failed to delete PA sync -13
[00:00:33.961,273] <inf> bt_mgmt_scan: Local addr: F3:1F:3E:44:97:B6 (random). May time out. Updates
not printed
[00:00:33.961,273] <inf> bt_mgmt_scan: Scanning successfully started
[00:00:33.961,273] <inf> main: Restarted scanning for broadcaster
[00:00:34.904,052] <inf> bt_mgmt_scan: PA synced to name: NRF5340_BROADCASTER, id: 0x06d1bf, addr: 2C
:87:9B:72:0B:28 (random)
[00:00:36.104,064] <inf> broadcast_sink: Sync with stereo channel
[00:00:36.104,064] <inf> broadcast_sink: Syncing to broadcast stream index 0
[00:00:36.104,217] <err> audio_system: GDM Decoder sample rate 48000
[00:00:36.104,217] <inf> main: Presentation delay 3000 us is set
[00:00:36.758,300] <wrn> bt_conn: conn 0x20003660 failed to establish. RF noise?
[00:00:36.758,331] <inf> broadcast_sink: Stream sync lost
[00:00:36.758,361] <inf> broadcast_sink: Stream index 0 stopped. Reason: 62
[00:00:36.758,361] <wrn> bt_conn: conn 0x20003730 failed to establish. RF noise?
[00:00:36.758,392] <inf> broadcast_sink: Stream sync lost
[00:00:36.758,422] <inf> broadcast_sink: Stream index 0 stopped. Reason: 62
[00:00:36.758,514] <inf> main: Sync lost
[00:00:36.758,911] <inf> main: PA sync lost, reason: 22
[00:00:36.759,735] <inf> bt_mgmt_scan: Local addr: F3:1F:3E:44:97:B6 (random). May time out. Updates
not printed
[00:00:36.759,735] <inf> bt_mgmt_scan: Scanning successfully started
[00:00:36.759,735] <inf> main: Restarted scanning for broadcaster
[00:00:36.759,735] <inf> main: Sync lost
[00:00:36.759,765] <wrn> main: PA sync is NULL
[00:00:36.760,101] <wrn> bt_hci_core: opcode 0x2045 status 0x0c
[00:00:36.760,101] <err> bt_mgmt: Failed to delete PA sync
[00:00:36.760,101] <wrn> main: Failed to delete PA sync -13
[00:00:36.761,260] <inf> bt_mgmt_scan: Local addr: F3:1F:3E:44:97:B6 (random). May time out. Updates
not printed
[00:00:36.761,260] <inf> bt_mgmt_scan: Scanning successfully started
[00:00:36.761,260] <inf> main: Restarted scanning for broadcaster
[00:00:37.304,046] <inf> bt_mgmt_scan: PA synced to name: NRF5340_BROADCASTER, id: 0x06d1bf, addr: 2C
:87:9B:72:0B:28 (random)
[00:00:38.504,058] <inf> broadcast_sink: Sync with stereo channel
[00:00:38.504,089] <inf> broadcast_sink: Syncing to broadcast stream index 0
[00:00:38.504,241] <err> audio_system: GDM Decoder sample rate 48000
[00:00:38.504,241] <inf> main: Presentation delay 3000 us is set
[00:00:39.158,325] <wrn> bt_conn: conn 0x20003660 failed to establish. RF noise?
[00:00:39.158,325] <inf> broadcast_sink: Stream sync lost
[00:00:39.158,386] <inf> broadcast_sink: Stream index 0 stopped. Reason: 62
[00:00:39.158,386] <wrn> bt_conn: conn 0x20003730 failed to establish. RF noise?
[00:00:39.158,416] <inf> broadcast_sink: Stream sync lost
[00:00:39.158,447] <inf> broadcast_sink: Stream index 0 stopped. Reason: 62
[00:00:39.158,538] <inf> main: Sync lost
[00:00:39.158,935] <inf> main: PA sync lost, reason: 22
[00:00:39.159,729] <inf> bt_mgmt_scan: Local addr: F3:1F:3E:44:97:B6 (random). May time out. Updates
not printed
[00:00:39.159,729] <inf> bt_mgmt_scan: Scanning successfully started
[00:00:39.159,759] <inf> main: Restarted scanning for broadcaster
[00:00:39.159,759] <inf> main: Sync lost
[00:00:39.159,759] <wrn> main: PA sync is NULL
[00:00:39.160,095] <wrn> bt_hci_core: opcode 0x2045 status 0x0c
[00:00:39.160,125] <err> bt_mgmt: Failed to delete PA sync
[00:00:39.160,125] <wrn> main: Failed to delete PA sync -13
[00:00:39.161,285] <inf> bt_mgmt_scan: Local addr: F3:1F:3E:44:97:B6 (random). May time out. Updates
not printed
[00:00:39.161,285] <inf> bt_mgmt_scan: Scanning successfully started
[00:00:39.161,285] <inf> main: Restarted scanning for broadcaster
[00:00:40.304,077] <inf> bt_mgmt_scan: PA synced to name: NRF5340_BROADCASTER, id: 0x06d1bf, addr: 2C
:87:9B:72:0B:28 (random)
[00:00:41.504,089] <inf> broadcast_sink: Sync with stereo channel
[00:00:41.504,089] <inf> broadcast_sink: Syncing to broadcast stream index 0
[00:00:41.504,241] <err> audio_system: GDM Decoder sample rate 48000
[00:00:41.504,272] <inf> main: Presentation delay 3000 us is set
[00:00:42.158,325] <wrn> bt_conn: conn 0x20003660 failed to establish. RF noise?
[00:00:42.158,355] <inf> broadcast_sink: Stream sync lost
[00:00:42.158,386] <inf> broadcast_sink: Stream index 0 stopped. Reason: 62
[00:00:42.158,386] <wrn> bt_conn: conn 0x20003730 failed to establish. RF noise?
[00:00:42.158,416] <inf> broadcast_sink: Stream sync lost
[00:00:42.158,447] <inf> broadcast_sink: Stream index 0 stopped. Reason: 62
[00:00:42.158,538] <inf> main: Sync lost
[00:00:42.158,935] <inf> main: PA sync lost, reason: 22
[00:00:42.159,759] <inf> bt_mgmt_scan: Local addr: F3:1F:3E:44:97:B6 (random). May time out. Updates
not printed
[00:00:42.159,759] <inf> bt_mgmt_scan: Scanning successfully started
[00:00:42.159,759] <inf> main: Restarted scanning for broadcaster
[00:00:42.159,790] <inf> main: Sync lost
[00:00:42.159,790] <wrn> main: PA sync is NULL
[00:00:42.160,125] <wrn> bt_hci_core: opcode 0x2045 status 0x0c
[00:00:42.160,125] <err> bt_mgmt: Failed to delete PA sync
[00:00:42.160,125] <wrn> main: Failed to delete PA sync -13
[00:00:42.161,285] <inf> bt_mgmt_scan: Local addr: F3:1F:3E:44:97:B6 (random). May time out. Updates
not printed
[00:00:42.161,285] <inf> bt_mgmt_scan: Scanning successfully started
[00:00:42.161,285] <inf> main: Restarted scanning for broadcaster
[00:00:42.704,071] <inf> bt_mgmt_scan: PA synced to name: NRF5340_BROADCASTER, id: 0x06d1bf, addr: 2C
:87:9B:72:0B:28 (random)
[00:00:44.504,089] <inf> broadcast_sink: Sync with stereo channel
[00:00:44.504,119] <inf> broadcast_sink: Syncing to broadcast stream index 0
[00:00:44.504,272] <err> audio_system: GDM Decoder sample rate 48000
[00:00:44.504,272] <inf> main: Presentation delay 3000 us is set
[00:00:46.958,374] <wrn> bt_conn: conn 0x20003660 failed to establish. RF noise?
[00:00:46.958,374] <inf> broadcast_sink: Stream sync lost
[00:00:46.958,404] <inf> broadcast_sink: Stream index 0 stopped. Reason: 62
[00:00:46.958,435] <wrn> bt_conn: conn 0x20003730 failed to establish. RF noise?
[00:00:46.958,465] <inf> broadcast_sink: Stream sync lost
[00:00:46.958,496] <inf> broadcast_sink: Stream index 0 stopped. Reason: 62
[00:00:46.958,557] <inf> main: Sync lost
[00:00:46.958,984] <inf> main: PA sync lost, reason: 22
[00:00:46.959,808] <inf> bt_mgmt_scan: Local addr: F3:1F:3E:44:97:B6 (random). May time out. Updates
not printed
[00:00:46.959,808] <inf> bt_mgmt_scan: Scanning successfully started
[00:00:46.959,808] <inf> main: Restarted scanning for broadcaster
[00:00:46.959,838] <inf> main: Sync lost
[00:00:46.959,838] <wrn> main: PA sync is NULL
[00:00:46.960,174] <wrn> bt_hci_core: opcode 0x2045 status 0x0c
[00:00:46.960,174] <err> bt_mgmt: Failed to delete PA sync
[00:00:46.960,205] <wrn> main: Failed to delete PA sync -13
[00:00:46.961,364] <inf> bt_mgmt_scan: Local addr: F3:1F:3E:44:97:B6 (random). May time out. Updates
not printed
[00:00:46.961,364] <inf> bt_mgmt_scan: Scanning successfully started
[00:00:46.961,364] <inf> main: Restarted scanning for broadcaster
[00:00:47.704,101] <inf> bt_mgmt_scan: PA synced to name: NRF5340_BROADCASTER, id: 0x06d1bf, addr: 2C
:87:9B:72:0B:28 (random)
[00:00:48.904,113] <inf> broadcast_sink: Sync with stereo channel
[00:00:48.904,144] <inf> broadcast_sink: Syncing to broadcast stream index 0
[00:00:48.904,296] <err> audio_system: GDM Decoder sample rate 48000
[00:00:48.904,296] <inf> main: Presentation delay 3000 us is set
[00:00:49.558,380] <wrn> bt_conn: conn 0x20003660 failed to establish. RF noise?
[00:00:49.558,380] <inf> broadcast_sink: Stream sync lost
[00:00:49.558,441] <inf> broadcast_sink: Stream index 0 stopped. Reason: 62
[00:00:49.558,441] <wrn> bt_conn: conn 0x20003730 failed to establish. RF noise?
[00:00:49.558,471] <inf> broadcast_sink: Stream sync lost
[00:00:49.558,502] <inf> broadcast_sink: Stream index 0 stopped. Reason: 62
[00:00:49.558,593] <inf> main: Sync lost
[00:00:49.558,990] <inf> main: PA sync lost, reason: 22
[00:00:49.559,783] <inf> bt_mgmt_scan: Local addr: F3:1F:3E:44:97:B6 (random). May time out. Updates
not printed
[00:00:49.559,814] <inf> bt_mgmt_scan: Scanning successfully started
[00:00:49.559,814] <inf> main: Restarted scanning for broadcaster
[00:00:49.559,814] <inf> main: Sync lost
[00:00:49.559,814] <wrn> main: PA sync is NULL
[00:00:49.560,150] <wrn> bt_hci_core: opcode 0x2045 status 0x0c
[00:00:49.560,180] <err> bt_mgmt: Failed to delete PA sync
[00:00:49.560,180] <wrn> main: Failed to delete PA sync -13
[00:00:49.561,340] <inf> bt_mgmt_scan: Local addr: F3:1F:3E:44:97:B6 (random). May time out. Updates
not printed
[00:00:49.561,340] <inf> bt_mgmt_scan: Scanning successfully started
[00:00:49.561,340] <inf> main: Restarted scanning for broadcaster
[00:00:50.504,119] <inf> bt_mgmt_scan: PA synced to name: NRF5340_BROADCASTER, id: 0x06d1bf, addr: 2C
:87:9B:72:0B:28 (random)
[00:00:52.904,144] <inf> broadcast_sink: Sync with stereo channel
[00:00:52.904,144] <inf> broadcast_sink: Syncing to broadcast stream index 0
[00:00:52.904,327] <err> audio_system: GDM Decoder sample rate 48000
[00:00:52.904,327] <inf> main: Presentation delay 3000 us is set
[00:00:54.158,416] <wrn> bt_conn: conn 0x20003660 failed to establish. RF noise?
[00:00:54.158,416] <inf> broadcast_sink: Stream sync lost
[00:00:54.158,447] <inf> broadcast_sink: Stream index 0 stopped. Reason: 62
[00:00:54.158,477] <wrn> bt_conn: conn 0x20003730 failed to establish. RF noise?
[00:00:54.158,508] <inf> broadcast_sink: Stream sync lost
[00:00:54.158,538] <inf> broadcast_sink: Stream index 0 stopped. Reason: 62
[00:00:54.158,599] <inf> main: Sync lost
[00:00:54.159,027] <inf> main: PA sync lost, reason: 22
[00:00:54.159,851] <inf> bt_mgmt_scan: Local addr: F3:1F:3E:44:97:B6 (random). May time out. Updates
not printed
[00:00:54.159,851] <inf> bt_mgmt_scan: Scanning successfully started
[00:00:54.159,851] <inf> main: Restarted scanning for broadcaster
[00:00:54.159,881] <inf> main: Sync lost
[00:00:54.159,881] <wrn> main: PA sync is NULL
[00:00:54.160,217] <wrn> bt_hci_core: opcode 0x2045 status 0x0c
[00:00:54.160,217] <err> bt_mgmt: Failed to delete PA sync
[00:00:54.160,217] <wrn> main: Failed to delete PA sync -13
[00:00:54.161,376] <inf> bt_mgmt_scan: Local addr: F3:1F:3E:44:97:B6 (random). May time out. Updates
not printed
[00:00:54.161,407] <inf> bt_mgmt_scan: Scanning successfully started
[00:00:54.161,407] <inf> main: Restarted scanning for broadcaster

[Glen M]

Thanks Hieu - our plan long term is to move to 3.0+, but we didn't have time to go down that path before our initial release. For now we've gotten it working smoothly by adjusting the presentation delay, and I'm not sure if the issues that solved are related to the FEM or not.
One question - most of the modifications I had to make to the firmware were related to receiving both the left and right channels on the headset (we swapped in a stereo codec rather than the mono one on the eval board). I made those changes based on an unofficial example someone linked me to where a Nordic employee made those changes in SDK 2.9.0.  From looking at the documentation for the newer SDK, it looks like stereo receive *might* have been incorporated as a selectable option. Do you know if that's true and if so how to configure that mode?

[Hieu]

Hi Glen,

Glen M said:

For now we've gotten it working smoothly by adjusting the presentation delay, and I'm not sure if the issues that solved are related to the FEM or not.

Do I understand right that the FEM issues have been taken cared of for now? If so, that's good news.

Glen M said:

From looking at the documentation for the newer SDK, it looks like stereo receive *might* have been incorporated as a selectable option. Do you know if that's true and if so how to configure that mode?

Yes, stereo has been experimentally supported. Refer to nRF Connect SDK v3.1.0 Release Notes.

The details of enabling it in any project is quite outside of my expertise, unfortunately. I see the Kconfigs to enable it is showed here: sdk-nrf/applications/nrf5340_audio/broadcast_sink/overlay-broadcast_sink.conf at v3.1.0 · nrfconnect/sdk-nrf.

For further follow-up regarding it, do you mind opening a new DevZone case? An engineer better suited for the topic can help you there; and we also try to keep each DevZone case focused on one topic.

[Glen M]

Regarding whether the FEM issue is fixed - It seems to be either fixed or mostly-fixed. I don't know the reason for the occasional 1ms dropouts we're getting and it's it's possible that it's due to the timing issue we've been told about with the FEM, but in general the system is working well enough that we shipped some to our customer, with those little dropouts being smoothed over by the presentation delay code.

Thanks for the links on the 3.1 solution - that is GREAT news that the stereo receive option has been incorporated there as it should let me start fresh with that SDK's nrf5340_audio example and just merge in my board files and other minor changes.

[Hieu]

Glen M said:

Regarding whether the FEM issue is fixed - It seems to be either fixed or mostly-fixed. I don't know the reason for the occasional 1ms dropouts we're getting and it's it's possible that it's due to the timing issue we've been told about with the FEM, but in general the system is working well enough that we shipped some to our customer, with those little dropouts being smoothed over by the presentation delay code.

I am out of the loop regarding the presentation delay mentioned, so I can't comment about it. If you are content with the result now, I am hesitant to push for the settle time adjustment. When you move to NCS v3.1.0 for stereo, it will be taken care of there anyway.

If you do modify the settle time in your custom board file, please keep in mind that the "fix" in NCS v3.0.0 is done partly by changing the default value. It means that any custom configuration will override the fix and should be changed/removed.

Other than that, I'm glad to hear you are happy with the audio change.