Channel sounding issues

RE: Channel sounding issues

Patrick49 — Thu, 23 Oct 2025 08:50:19 GMT

Hi Simon,

Alright, I've created the ticket. Hopefully I can solve that issue so we can continue our channel sounding testing.

Thanks and best regards,

Patrick

RE: Channel sounding issues

Simonr — Thu, 23 Oct 2025 08:01:24 GMT

Hi Patrick

It would be smoothest if you open a new ticket describing it in detail. That way we can keep a good overview of what's going on. If you'd prefer I can take that case as well, or we can let the assignment process do its magic.

It's much easier to keep an overview of tickets in DevZone if we keep each ticket to one subject. Thank you for your thorough testing here though. I'm sure we will figure out what the issue is.

Best regards,

Simon

RE: Channel sounding issues

Patrick49 — Wed, 22 Oct 2025 10:26:07 GMT

Hello Simon,

Yes, that's right, it's only happening with my custom boards.
I'm using a FTDI TTL to USB cable with only Rx and Tx for the UART signals, on my custom board side.
The only major difference is that I don't use the external LFXO on my custom board but I don't see why this channel sounding sample wouldn't work on the newer sample compared to the older one.

Ok I've just tried with SDK 3.1.0 and 3.1.1, some other samples like the LBS, or the UART peripheral but none are working properly on my custom board. It doesn't detect my device on the nRF Connect application nor print any log in the console. I guess I've found a new issue then. Do I need to open a new ticket to solve this problem ?

Best regards,

Patrick

RE: Channel sounding issues

Simonr — Wed, 22 Oct 2025 09:30:35 GMT

So it's only on the custom boards you're having issues now, correct? What are you using as the VCOM interface between the nRF54L15 and the computer in this case to get logging on the computer? Is it the DK or another interface? Since this worked on an older device I assume it's not HW related, I'm just trying to understand the differences between the custom and DK setups better.

Best regards,

Simon

RE: Channel sounding issues

Patrick49 — Tue, 21 Oct 2025 07:56:30 GMT

Hello Simon,

I tried flashing the new samples from SDK 3.1.0 and 3.1.1 on my custom boards but neither of them show any log in the console. The UART is working fine (except that the \n doesn't work properly with my custom boards, so it overlaps the message), see the screenshot below with the blinky sample :

and I can confirm, I'm not seeing null IFFT values when testing it on the two nRF54L15-dk.
So, I don't know how to solve this issue.

Best regards,

Patrick

RE: Channel sounding issues

Simonr — Tue, 21 Oct 2025 06:20:11 GMT

I ran the Channel Sounding sample on two DKs for a few hours last night, and I don't have a single IFFT value showing 0 or any "ranging data overwritten" messages. Note that I ran the sample in NCS v3.1.1. As of NCS 3.1.0, the CONFIG_BT_CTLR_CHANNEL_SOUNDING_TEST Kconfig option was added. This option reduces the NVM usage of Channel Sounding when disabled by removing the LE CS Test and LE CS Test End HCI commands. I think this at least helps with the NVM usage and the ranging data issues.

Best regards,

Simon

RE: Channel sounding issues

Patrick49 — Mon, 20 Oct 2025 08:55:28 GMT

Hello,

1. I've tested both the default channel sounding sample as well as my modified version that only weight the average of the three methods. The test was indoor, both devices were placed on a table in a short range.

2. I tried this option on the reflector since it's this device that has de RSSP defined. But it doesn't change anything with the default channel sounding sample, whether I put the value at 1 or 10. This picture is taken after 35 minutes of testing, the logs can be found in the attached document as well.

devzone.nordicsemi.com/.../Logs_5F00_CS_5F00_40min.txt

Anyway, I'll try to modify my program so it doesn't only loop on those measurements so that I won't get this error again. Also I'm seeing that some values are doubled.

Best regards,

Patrick

RE: Channel sounding issues

Simonr — Thu, 09 Oct 2025 13:09:19 GMT

1. Can you share some more details on your testing environment here, and if you've made any specific changes to the channel sounding sample projects?

2. Regarding the "Ranging data overwritten". You can try increasing CONFIG_BT_RAS_RRSP_RD_BUFFERS_PER_CONN to allow more rangings in one connection.

Best regards,

Simon