tests/bsim/bt bis: Add support for split build with sysbuild

Add sysbuild build files, which allows building this test
both for the targets we could already before
(nrf52_bsim & nrf5340bsim_nrf5340_cpunet)
and also adds support for the a split build with the
nrf5340bsim_nrf5340_cpuapp.

Signed-off-by: Alberto Escolar Piedras <[email protected]>

Author: aescolar

tests/bsim/bluetooth/ll/bis/Kconfig.sysbuild

@@ -0,0 +1,14 @@
+# Copyright 2023 Nordic Semiconductor ASA
+# SPDX-License-Identifier: Apache-2.0
+
+source "share/sysbuild/Kconfig"
+
+config NET_CORE_BOARD
+	string
+	default "nrf5340bsim_nrf5340_cpunet" if $(BOARD) = "nrf5340bsim_nrf5340_cpuapp"
+
+config NATIVE_SIMULATOR_PRIMARY_MCU_INDEX
+	int
+	# Let's pass the test arguments to the application MCU test
+	# otherwise by default they would have gone to the net core.
+	default 0 if $(BOARD) = "nrf5340bsim_nrf5340_cpuapp"

tests/bsim/bluetooth/ll/bis/prj.conf

@@ -21,3 +21,6 @@ CONFIG_BT_CTLR_ADV_ISO_PDU_LEN_MAX=251
 CONFIG_BT_CTLR_SYNC_ISO_PDU_LEN_MAX=251
 
 CONFIG_BT_CTLR_TEST=y
+
+CONFIG_BT_BUF_ACL_TX_SIZE=251
+CONFIG_BT_BUF_ACL_RX_SIZE=255

tests/bsim/bluetooth/ll/bis/sysbuild.cmake

@@ -0,0 +1,47 @@
+# Copyright (c) 2023 Nordic Semiconductor ASA
+# SPDX-License-Identifier: Apache-2.0
+
+if(NOT("${SB_CONFIG_NET_CORE_BOARD}" STREQUAL ""))
+	set(NET_APP hci_rpmsg)
+	set(NET_APP_SRC_DIR ${ZEPHYR_BASE}/samples/bluetooth/${NET_APP})
+
+	ExternalZephyrProject_Add(
+		APPLICATION ${NET_APP}
+		SOURCE_DIR  ${NET_APP_SRC_DIR}
+		BOARD       ${SB_CONFIG_NET_CORE_BOARD}
+	)
+
+	set(${NET_APP}_CONF_FILE
+	 ${NET_APP_SRC_DIR}/nrf5340_cpunet_iso-bt_ll_sw_split.conf
+	 CACHE INTERNAL ""
+	)
+
+	# For the simulated board, the application core build will produce the final executable
+	# for that, we give it the path to the netcore image
+	set(NET_LIBRARY_PATH ${CMAKE_BINARY_DIR}/${NET_APP}/zephyr/zephyr.elf)
+	set_property(TARGET ${DEFAULT_IMAGE} APPEND_STRING PROPERTY CONFIG
+		"CONFIG_NATIVE_SIMULATOR_EXTRA_IMAGE_PATHS=\"${NET_LIBRARY_PATH}\"\n"
+	)
+
+	if (NOT ("${SB_CONFIG_NATIVE_SIMULATOR_PRIMARY_MCU_INDEX}" STREQUAL ""))
+		set_property(TARGET ${NET_APP} APPEND_STRING PROPERTY CONFIG
+			"CONFIG_NATIVE_SIMULATOR_PRIMARY_MCU_INDEX=${SB_CONFIG_NATIVE_SIMULATOR_PRIMARY_MCU_INDEX}\n"
+		)
+		set_property(TARGET ${DEFAULT_IMAGE} APPEND_STRING PROPERTY CONFIG
+			"CONFIG_NATIVE_SIMULATOR_PRIMARY_MCU_INDEX=${SB_CONFIG_NATIVE_SIMULATOR_PRIMARY_MCU_INDEX}\n"
+		)
+	endif()
+
+	# Let's build the net core library first
+	add_dependencies(${DEFAULT_IMAGE} ${NET_APP})
+endif()
+
+# Let's meet the expectation of finding the final executable in zephyr/zephyr.exe
+add_custom_target(final_executable
+	ALL
+	COMMAND
+	${CMAKE_COMMAND} -E copy
+	${CMAKE_BINARY_DIR}/${DEFAULT_IMAGE}/zephyr/zephyr.exe
+	${CMAKE_BINARY_DIR}/zephyr/zephyr.exe
+	DEPENDS ${DEFAULT_IMAGE}
+)