Failed to use Channel Sounding Mode 3

[Fhar]

Hello Support Team,

I am currently working on Channel Sounding with the nRF54L15 devkit, and I am encountering an issue when using main_mode.

Until now, I was using the default configuration BT_CONN_LE_CS_MAIN_MODE_2, and I decided to try MODE 3, as shown below:

.main_mode_type = BT_CONN_LE_CS_MAIN_MODE_3,
.sub_mode_type = BT_CONN_LE_CS_SUB_MODE_1,

I also changed the following configuration in prj.conf from n to y 

CONFIG_BT_RAS_MODE_3_SUPPORTED=y
CONFIG_BT_CTLR_SDC_CS_STEP_MODE3=y

However, after compiling, I encountered the following issues:

<err> app_main: Failed to create CS config (err -22)

Do you have any idea how to fix this? I have seen that this discussion (7 months ago) https://devzone.nordicsemi.com/f/nordic-q-a/123030/issue-with-channel-sounding-modes-on-nrf54l15dk talk about it already but wasn't answered. 

Thank you in advance for your help.

Best regards,

[SwRa]

Hi Harmel,

Checking this now. Will get back to you with the updates.

(Thanks for attaching the previous case as well. The case went into waiting list and skipped the queue to be resolved)

Regards,

Swathy

[SwRa]

Hi Harmel,

I see that you have added the following:

.main_mode_type = BT_CONN_LE_CS_MAIN_MODE_3,
.sub_mode_type = BT_CONN_LE_CS_SUB_MODE_1,

This is not a valid combination of main mode and sub mode types.. See here: https://www.bluetooth.com/wp-content/uploads/Files/Specification/HTML/Core-62/out/en/low-energy-controller/channel-sounding.html#UUID-5bd41abf-c6ad-a020-d3cf-e6ad8434fc66_N1690580327249 

The valid combination to run step mode 3 is as follows:

.main_mode_type = BT_CONN_LE_CS_MAIN_MODE_3,
.sub_mode_type = BT_CONN_LE_CS_SUB_MODE_UNUSED

Please see if that helps.

Best Regards,

Swathy