Bluetooth sample iso_receive - cannot build

RE: Bluetooth sample iso_receive - cannot build

Karl Ylvisaker — Tue, 03 May 2022 15:01:36 GMT

Hello,

[quote user="skajam66"]Apologies for the confusion.[/quote]

No problem at all, AC! :)

That sounds like a good plan!
I too think that this question might be more suited for the zephyr team, since you are using the Zephyr controller.
If they should point you back to us we can review their feedback in the new ticket, no problem.

Best regards,
Karl

RE: Bluetooth sample iso_receive - cannot build

skajam66 — Fri, 29 Apr 2022 10:33:16 GMT

Hi,

I can see an engineer has been assigned but, since posting the comment, I now think that this is a Zephyrcontroller issue so I have raised it with the Zephyr team.

I'm going to close this ticket - if the Zephyr team point to it being a Nordic issue, I'll open up a new ticket.

Apologies for the confusion.

Regards,

RE: Bluetooth sample iso_receive - cannot build

skajam66 — Mon, 25 Apr 2022 10:39:30 GMT

Hi Oivind,

Thank you for your response. A step forward:

With just CONFIG_BT_ISO_SYNC_RECEIVER=y config option in hci_rpmsg.conf, the DK board is receiving iso broadcast from my source board (a custom board running the Packetcraft stack). A snippet of the log files:

Waiting for periodic advertising...
[DEVICE]: FE:BA:10:A0:87:D4 (public), AD evt type 5, Tx Pwr: 127, RSSI -68 Packetcraft audio-cis C:0 S:0 D:0 SR:0 E:1 Prim: LE 1M, Secn: LE 1M, Interval: 0x00a0 (200 ms), SID: 0
Found periodic advertising.
Stop scanning...success.
Creating Periodic Advertising Sync...success.
Waiting for periodic sync...
[DEVICE]: FE:BA:10:A0:87:D4 (public), AD evt type 5, Tx Pwr: 127, RSSI -68 Packetcraft audio-cis C:0 S:0 D:0 SR:0 E:1 Prim: LE 1M, Secn: LE 1M, Interval: 0x00a0 (200 ms), SID: 0
PER_ADV_SYNC[0]: [DEVICE]: FE:BA:10:A0:87:D4 (public) synced, Interval 0x00a0 (200 ms), PHY LE 1M
PER_ADV_SYNC[0]: [DEVICE]: FE:BA:10:A0:87:D4 (public), tx_power 127, RSSI -67, CTE 0, data length 0, data: 
Periodic sync established.
Waiting for BIG info...
PER_ADV_SYNC[0]: [DEVICE]: FE:BA:10:A0:87:D4 (public), tx_power 127, RSSI -68, CTE 0, data length 0, data: 
PER_ADV_SYNC[0]: [DEVICE]: FE:BA:10:A0:87:D4 (public), tx_power 127, RSSI -67, CTE 0, data length 0, data: 
PER_ADV_SYNC[0]: [DEVICE]: FE:BA:10:A0:87:D4 (public), tx_power 127, RSSI -67, CTE 0, data length 0, data: 
PER_ADV_SYNC[0]: [DEVICE]: FE:BA:10:A0:87:D4 (public), tx_power 127, RSSI -72, CTE 0, data length 0, data: 
PER_ADV_SYNC[0]: [DEVICE]: FE:BA:10:A0:87:D4 (public), tx_power 127, RSSI -70, CTE 0, data length 0, data: 
PER_ADV_SYNC[0]: [DEVICE]: FE:BA:10:A0:87:D4 (public), tx_power 127, RSSI -72, CTE 0, data length 0, data: 
failed (err -11)
Deleting Periodic Advertising Sync...Start scanning...success.

However, when I also enable CONFIG_BT_LL_SW_SPLIT=y and CONFIG_BT_CTLR_ADV_EXT=y in hci_rpmsg.conf, I still see standard LE advertising and scan requests but I no longer see the iso broadcasts. Sample log file:

[DEVICE]: F0:C7:7F:AD:4D:7F (public), AD evt type 0, Tx Pwr: 127, RSSI -64  C:1 S:1 D:0 SR:0 E:0 Prim: LE 1M, Secn: No packets, Interval: 0x0000 (0 ms), SID: 255
[DEVICE]: F0:C7:7F:AD:4D:7F (public), AD evt type 4, Tx Pwr: 127, RSSI -64 Blue Box      C:1 S:1 D:0 SR:1 E:0 Prim: LE 1M, Secn: No packets, Interval: 0x0000 (0 ms), SID: 255
[DEVICE]: 7B:52:2D:01:FC:A7 (random), AD evt type 0, Tx Pwr: 127, RSSI -51  C:1 S:1 D:0 SR:0 E:0 Prim: LE 1M, Secn: No packets, Interval: 0x0000 (0 ms), SID: 255
[DEVICE]: 7B:52:2D:01:FC:A7 (random), AD evt type 4, Tx Pwr: 127, RSSI -49  C:1 S:1 D:0 SR:1 E:0 Prim: LE 1M, Secn: No packets, Interval: 0x0000 (0 ms), SID: 255

The team at Zephyr also told me to add these to prj.conf:

CONFIG_BT_CTLR_ADV_EXT=y
CONFIG_BT_CTLR_SYNC_PERIODIC=y
CONFIG_BT_CTLR_SYNC_ISO=y

By themselves, VS Code shows missing dependency errors. By further adding CONFIG_BT_CTLR and CONFIG_BT_HCI, the dependency errors go away but the code will not build.

I have also tried adding these to hci_rpmsg.conf and that has no visible effect.

Are there any other configs that you can think of that I might need?

Regards,

RE: Bluetooth sample iso_receive - cannot build

Øivind — Mon, 25 Apr 2022 08:24:03 GMT

Ok, to use the Zephyr controller you need to add CONFIG_BT_LL_SW_SPLIT=y to the child_image/hci_rpmsg.conf.

The sample seems to work when I also enable advertising extensions.

My hci_rpmsg.conf:

CONFIG_BT_ISO_SYNC_RECEIVER=y
CONFIG_BT_LL_SW_SPLIT=y
CONFIG_BT_CTLR_ADV_EXT=y

RE: Bluetooth sample iso_receive - cannot build

skajam66 — Sun, 24 Apr 2022 11:59:31 GMT

Hi Oivind,

Thank you for your suggestion. I can confirm that after making this change I can see the board scanning and receiving advertisements.

However, this will be using the Nordic SoftDevice controller. How do I switch to the Zephyr controller? I have tried manually editing prj.conf and adding CONFIG_BT_LL_SW_SPLIT=y and, separately, I have tried changing settings in Kconfig. Both approaches result in various build failures.

Can you point me to any documentation that will tell me what I need to do?

Regards,

RE: Bluetooth sample iso_receive - cannot build

Øivind — Fri, 22 Apr 2022 11:32:13 GMT

Hi,

You need to create a directory named "child_image" in the project directory. In "child_image" you need to add a file named "hci_rpmsg.conf". hci_rpmsg.conf should contain this line:

CONFIG_BT_ISO_SYNC_RECEIVER=y

For clarity, the path will be iso_receive/child_image/hci_rpmsg.conf
This will add the config to the image on the network core, which controls the radio.

No other changes to the original sample are needed to start scanning.