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Update documentation for Channel Sounding Kconfig options #21036

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Update documentation for Channel Sounding Kconfig options #21036

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25 changes: 23 additions & 2 deletions subsys/bluetooth/controller/Kconfig
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Original file line number Diff line number Diff line change
Expand Up @@ -584,25 +584,42 @@ config BT_CTLR_SDC_CIS_SUBEVENT_LENGTH_US
config BT_CTLR_CHANNEL_SOUNDING
bool "Channel Sounding support [EXPERIMENTAL]"
select EXPERIMENTAL
help
Enable Channel Sounding support.

config BT_CTLR_SDC_CS_COUNT
int "Number of concurrent connections supporting CS procedure [EXPERIMENTAL]"
default 1
range 1 BT_MAX_CONN
depends on BT_CTLR_CHANNEL_SOUNDING
help
Set the number of concurrent connections that can support Channel Sounding procedure.
Set the number of concurrent connections that can support Channel Sounding.
Needs to be equal to or less than BT_MAX_CONN

config BT_CTLR_SDC_CS_MAX_ANTENNA_PATHS
int "Max number of Channel Sounding antenna paths supported by the controller [EXPERIMENTAL]"
default 1
range 1 4
depends on BT_CTLR_CHANNEL_SOUNDING
help
Set the max number of antenna paths the controller supports. This differs from BT_CTLR_SDC_CS_NUM_ANTENNAS
since you can run a setup where local controller only has one antenna, but peer controller has two antennas.
In this configuration, set BT_CTLR_SDC_CS_NUM_ANTENNAS to 1 and BT_CTLR_SDC_CS_MAX_ANTENNA_PATHS to 2
(since local controller can send to both of the peer antennas, creating a total of 2 antenna paths)
This option is purely a RAM-usage optimisation. If this option is set to 4, the controller has to reserve space for
a total of 5 measurements per CS-step. However, if you set this to 1, the controller will only reserve space for
2 measurements per CS-step.

config BT_CTLR_SDC_CS_NUM_ANTENNAS
int "Number of antennas used in Channel Sounding procedure supported by the controller [EXPERIMENTAL]"
default 1
range 1 BT_CTLR_SDC_CS_MAX_ANTENNA_PATHS
depends on BT_CTLR_CHANNEL_SOUNDING
help
Set the max number of antennas supported by local controller. This differs from BT_CTLR_SDC_CS_MAX_ANTENNA_PATHS
since you can run a setup where both local controller and peer controller has 2 antennas.
In this configuration, set BT_CTLR_SDC_CS_NUM_ANTENNAS to 2 and BT_CTLR_SDC_CS_MAX_ANTENNA_PATHS to 4
(since both of the local antennas can send to both of the peer's antennas, creating a total of 4 antenna paths).

config BT_CTLR_SDC_CS_MULTIPLE_ANTENNA_SUPPORT
bool
Expand All @@ -613,8 +630,12 @@ config BT_CTLR_SDC_CS_MULTIPLE_ANTENNA_SUPPORT
Internal helper config. Not intended for use.

config BT_CTLR_SDC_CS_STEP_MODE3
bool "Enable optional step mode-3 capability [EXPERIMENTAL]"
bool "Enable optional step mode-3 support [EXPERIMENTAL]"
default n
depends on BT_CTLR_CHANNEL_SOUNDING
help
Enable optional step mode-3 support. Channel sounding will not automatically start using step mode-3 if this
config is set. To use step mode-3, you need to modify the configuration which is created using the LE CS Create config command.

config BT_CTLR_SDC_LE_POWER_CLASS_1
bool "Device supports transmitting at LE Power Class 1 level"
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