fw: app: Build as CMake External Project

This adopts this pattern from the bootloader build. It adds more
flexibility. It is assumed that in this way multiple builds for
different boards can easily be achieved.

3 files changed, 34 insertions, 26 deletions

diff --git a/fw/CMakeLists.txt b/fw/CMakeLists.txt
index 5b1e42b..aa5af1c 100644
--- a/fw/CMakeLists.txt
+++ b/fw/CMakeLists.txt
@@ -4,28 +4,45 @@
 
 cmake_minimum_required(VERSION 3.20.0)
 
+include(ExternalProject)
+
 set(KEY_DEFAULT "$ENV{HOME}/mcuboot/key.pem")
 set(KEY ${KEY_DEFAULT} CACHE STRING "Firmware signing key path")
 message(STATUS "Firmware signing key path: ${KEY}")
 
-set(BOARD "native_sim/native/64")
-add_subdirectory(rtos)
+set(BOARD_DEFAULT "native_sim/native/64")
+set(BOARD ${BOARD_DEFAULT} CACHE STRING "Zephyr board identifier")
+message(STATUS "Selected board: ${BOARD}")
 
+add_subdirectory(rtos)
 string(REPLACE ";" "," ZEPHYR_MODULES_COMMA "${ZEPHYR_MODULES}")
-include(ExternalProject)
+
+if(BOARD STREQUAL "nucleo_f767zi")
+	ExternalProject_Add(
+		btl
+		PREFIX btl
+		SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/rtos/modules/mcuboot/boot/zephyr"
+		BINARY_DIR "${CMAKE_CURRENT_BINARY_DIR}/btl"
+		INSTALL_COMMAND ""
+		LIST_SEPARATOR ","
+		CMAKE_ARGS
+			"-DBOARD=${BOARD}"
+			"-DZEPHYR_BASE=${ZEPHYR_BASE}"
+			"-DZEPHYR_MODULES=${ZEPHYR_MODULES_COMMA}"
+			"-DEXTRA_CONF_FILE=${CMAKE_CURRENT_SOURCE_DIR}/btl/bootloader.conf"
+			-DCONFIG_BOOT_SIGNATURE_KEY_FILE="${KEY}"
+	)
+endif()
+
 ExternalProject_Add(
-	btl
-	PREFIX btl
-	SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/rtos/modules/mcuboot/boot/zephyr"
-	BINARY_DIR "${CMAKE_CURRENT_BINARY_DIR}/btl"
+	app
+	PREFIX app
+	SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/app"
+	BINARY_DIR "${CMAKE_CURRENT_BINARY_DIR}/app"
 	INSTALL_COMMAND ""
 	LIST_SEPARATOR ","
 	CMAKE_ARGS
-		"-DBOARD=nucleo_f767zi"
+		"-DBOARD=${BOARD}"
 		"-DZEPHYR_BASE=${ZEPHYR_BASE}"
 		"-DZEPHYR_MODULES=${ZEPHYR_MODULES_COMMA}"
-		"-DEXTRA_CONF_FILE=${CMAKE_CURRENT_SOURCE_DIR}/btl/bootloader.conf"
-		-DCONFIG_BOOT_SIGNATURE_KEY_FILE="${KEY}"
 )
-
-add_subdirectory(app)
diff --git a/fw/app/CMakeLists.txt b/fw/app/CMakeLists.txt
index ce10104..47f75f6 100644
--- a/fw/app/CMakeLists.txt
+++ b/fw/app/CMakeLists.txt
@@ -10,7 +10,7 @@ find_package(Zephyr
 		"${ZEPHYR_BASE}"
 )
 
-project(iot-contact-fw)
+project(iot-contact-app)
 
 target_sources(app
 	PRIVATE
diff --git a/fw/nucleo.sh b/fw/nucleo.sh
index b48b759..e89ff07 100755
--- a/fw/nucleo.sh
+++ b/fw/nucleo.sh
@@ -24,30 +24,21 @@ FW="$(dirname "$SCRIPT")"
 ROOT="$(dirname "$FW")"
 BUILD="${ROOT}/nucleo"
 BOOTLOADER_FIRMWARE="${BUILD}/fw/btl/zephyr/zephyr.bin"
-APPLICATION_FIRMWARE="${BUILD}/fw/zephyr/zephyr.bin"
-APPLICATION_FIRMWARE_SIGNED="${BUILD}/fw/zephyr/zephyr.signed.bin"
+APPLICATION_FIRMWARE="${BUILD}/fw/app/zephyr/zephyr.bin"
+APPLICATION_FIRMWARE_SIGNED="${BUILD}/fw/app/zephyr/zephyr.signed.bin"
 BOOTLOADER_FLASH_ADDRESS='0x8000000'
 APPLICATION_FLASH_ADDRESS='0x8040000'
-MCUBOOT="${ROOT}/fw/btl/mcuboot"
-IMGTOOL="${MCUBOOT}/scripts/imgtool.py"
+IMGTOOL="${ROOT}/imgtool.py"
 KEY="${HOME}/mcuboot/key.pem"
 BOARD='nucleo_f767zi'
-EXTRA_CONFIGS=''
 BAUDRATE='115200'
 SERIAL_PORT='/dev/ttyACM0'
-CONFIG_OVERLAY="${FW}/my.conf"
 
 
-if test -f "$CONFIG_OVERLAY"
-then
-	EXTRA_CONFIGS="${EXTRA_CONFIGS} ${CONFIG_OVERLAY}"
-fi
-
 set -x
 
 rm -rf "$BUILD"
-cmake "-B${BUILD}" -GNinja -DBOARD="$BOARD" \
-	-DEXTRA_CONF_FILE="${EXTRA_CONFIGS}" -DKEY="$KEY"
+cmake "-B${BUILD}" -GNinja -DBOARD="$BOARD"
 ninja -C "$BUILD"
 python "$IMGTOOL" sign \
 	--version 0.0.0 \