Central PAST scan failed

RE: Central PAST scan failed

LandyWang — Wed, 16 Apr 2025 02:01:56 GMT

Thank you, it works for me.

RE: Central PAST scan failed

Hung Bui — Tue, 15 Apr 2025 09:42:45 GMT

Hi Landy,
Seems that the central_past doesn't support sysbuild by default.
Please copy the following files from the nrf5340_audio project to the central_past project:
Kconfig.sysbuild

sysbuild\ipc_radio folder.

After that you should be able to see the netcore image being built.

I attached my project for your reference. A quick test here showed that the audio DK can do scanning.

devzone.nordicsemi.com/.../central_5F00_past.zip

RE: Central PAST scan failed

LandyWang — Tue, 15 Apr 2025 03:33:39 GMT

Hello,

Thank you for your assistance. I tried using sysbuild in v2.7.0, but strangely, I only got merged.hex but not merged_CPUNET.hex.

I burned this merged.hex into the nrf5340audio DK, and the program does not seem to be running.

I burned this merged hex file together with merged_CPUNET.hex of audio sample into nrf5340audio DK, and still encountered the scan failed problem.

In addition, I did another test, adding the central_past code to the nrf5340 audio sample code and found that it would not have the scan fail problem.

This seems to be a scan fail caused by missing config. I will look into it further.

RE: Central PAST scan failed

Hung Bui — Mon, 14 Apr 2025 13:38:15 GMT

Hi Landy,

Håkon is away this week. I will try to help you in the mean time.
Could you try to use sysbuild instead of the system default ?
I can find a ticket here with similar error and also on 2.7:
RE: nRF5340 audio application ZEPHYR FATAL ERROR in NCS v2.7.0

If you look at the last reply , using sysbuild solved the problem.

Please try to do west flash or click the flash button instead of trying to manually flash merged_domains.hex.

RE: Central PAST scan failed

LandyWang — Wed, 09 Apr 2025 01:58:20 GMT

Yes, I am using nrf5340 audio DK, and the NCS version is 2.7.0.

Here is my build configuration.

I used the programmer to burn merged_domains.hex to the nrf5340 audio DK after building, and then encountered this problem.

RE: Central PAST scan failed

Elfving — Tue, 08 Apr 2025 14:08:07 GMT

You are using an Audio DK right? I tried reproducing this now, and I do not think I am seeing the same thing on my side here. Default sample, and eg. NCS 2.7?

Regards,

Elfving

RE: Central PAST scan failed

LandyWang — Mon, 07 Apr 2025 05:19:14 GMT

Thank you for your reply.

This is my prj.conf.

CONFIG_BT=y
CONFIG_BT_CENTRAL=y
CONFIG_BT_EXT_ADV=y
CONFIG_BT_PER_ADV_SYNC=y
CONFIG_LOG=y
CONFIG_BT_DEVICE_NAME="Test Central Periodic Advertising Sync Transfer"
CONFIG_BT_PER_ADV_SYNC_TRANSFER_SENDER=y

CONFIG_USE_SEGGER_RTT=y
CONFIG_RTT_CONSOLE=y

And here is my build configuration. I am using the parent/child image-build.

RE: Central PAST scan failed

Elfving — Wed, 02 Apr 2025 14:31:47 GMT

Hi,

I believe the issue here is that you'll have to add a few configurations to the child image, eg. CONFIG_BT_EXT_ADV. I bet these are already set in the netcore in more complex applications that already select a lot of features - like the audio application. Are you using sysbuild or the legacy parent/child image-build?

Regards,

Elfving

RE: Central PAST scan failed

LandyWang — Wed, 02 Apr 2025 01:30:14 GMT

Thank you for your reply.

I use samples/bluetooth/central on nrf5340 audio DK and it works fine, and the scan starts successfully.

In addition, I copied the code of central_past to nrf\applications\nrf5340_audio and used it, and the scan could also start successfully.

I don't know why scan fail occurs when using samples\bluetooth\central_past alone.

RE: Central PAST scan failed

Jakob Ruhe — Tue, 01 Apr 2025 19:03:36 GMT

I see. I have never used a nrf5340 so I am really not sure. But I know that it has two MCU:s, one typically used by the application and the other is used for the controller. Although powerful, I guess it also makes things a bit more complicated. So sometimes you need to flash also the controller. Perhaps that is what you are doing already?

Here someone had a similar problem (quite some time ago though) :

Start scanning...failed (err -5) NCS2.2.0

Does, for example, the sample application `samples/bluetooth/central` work for you?