Channel sounding issues

[Patrick49]

Hello, 

I'm having some issues with the channel sounding on the nRF54L15.
I'm using two nRF54L15-dk and two custom bords with the nRF54L15.I'm using SDK v3.0.2 for my software and work on Windows 11.

The first one, is that I'm getting some broken ifft values equal to 0, sometimes, as shown below. This issue is happening both with the dk and my custom boards.

Since the ifft should be the best measuring method, it's problematic to have some null values.

The second one is with a custom board. When I run my program for about 30-35 minutes, a warning about ranging data overwritten shows up. Therefore, it doesn't stock new values after 4096 values ? and we need to reboot if several errors appear to resume normally the measurements. 

This warning doesn't show up with the dk when I run the same code and for a longer period of time as well. 

My code can be found in the archive in the attached documents.

CS_code.zip

Thanks and best regards,

Patrick 

[Simonr]

Hi

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

[Patrick49]

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