bluetooth: services: Redefine the CS RAS reassembly buffer kconfig

Redefining the BT_CHANNEL_SOUNDING_REASSEMBLY_BUFFER_SIZE kconfig so
that it has defaults based off of selected optional features.

This allows users to ignore the buffer size in the RAS samples in most
cases without it costing too much memory.

Signed-off-by: Thomas Johansen <[email protected]>

Author: thomas-m-johansen

subsys/bluetooth/services/ras/Kconfig.ras

@@ -33,4 +33,25 @@ config BT_RAS_MODE_3_SUPPORTED
 	  Must match the supported CS capabilities of the local device.
 	  This affects the per-instance memory usage of RAS.
 
+# CONFIG_BT_CHANNEL_SOUNDING_REASSEMBLY_BUFFER_SIZE is declared in Zephyr and also
+# here for a second time, to set a different range for the CS subevent result reassembly
+# buffer. Default values are also set based on RAS configs to help users reduce RAM usage.
+config BT_CHANNEL_SOUNDING_REASSEMBLY_BUFFER_SIZE
+	int "Subevent result reassembly buffer size"
+	depends on BT_CHANNEL_SOUNDING
+	range 239 4800
+	default 1920 if BT_RAS_MAX_ANTENNA_PATHS=1 && !BT_RAS_MODE_3_SUPPORTED
+	default 2560 if BT_RAS_MAX_ANTENNA_PATHS=2 && !BT_RAS_MODE_3_SUPPORTED
+	default 3200 if BT_RAS_MAX_ANTENNA_PATHS=3 && !BT_RAS_MODE_3_SUPPORTED
+	default 3840 if BT_RAS_MAX_ANTENNA_PATHS=4 && !BT_RAS_MODE_3_SUPPORTED
+	default 2880 if BT_RAS_MAX_ANTENNA_PATHS=1 && BT_RAS_MODE_3_SUPPORTED
+	default 3520 if BT_RAS_MAX_ANTENNA_PATHS=2 && BT_RAS_MODE_3_SUPPORTED
+	default 4160 if BT_RAS_MAX_ANTENNA_PATHS=3 && BT_RAS_MODE_3_SUPPORTED
+	default 4800
+	help
+	  When the results for a CS subevent cannot fit into a single HCI event,
+	  it will be split up into multiple events and consequently, reassembled into a
+	  full CS subevent. This config sets the size of the reassembly buffer.
+
+
 endif # BT_RAS