Add cmake code to prepend the Prusa Magic™

CMakeLists.txt

@@ -161,6 +161,15 @@ if(CMAKE_CROSSCOMPILING)
 
   # generate linker map file
   target_link_options(firmware PUBLIC -Wl,-Map=firmware.map)
+
+  # Put Prusa Magic™ at the beginning of the hex
+  add_custom_command(
+    TARGET firmware POST_BUILD
+    COMMAND ${CMAKE_COMMAND} -D WORK_DIR=${CMAKE_BINARY_DIR} -P
+            ${CMAKE_SOURCE_DIR}/cmake/HexConcat.cmake
+    DEPENDS firmware.hex
+    )
+
 endif()
 
 target_include_directories(firmware PRIVATE src lib)

cmake/HexConcat.cmake

@@ -0,0 +1,7 @@
+cmake_minimum_required(VERSION 2.8)
+set(HEX_PREFIX "\; device = mm-control\n\n")
+set(HEX_NAME "MM-control-01.hex")
+file(READ ${WORK_DIR}/firmware.hex HEX)
+file(WRITE ${WORK_DIR}/${HEX_NAME} ${HEX_PREFIX})
+file(APPEND ${WORK_DIR}/${HEX_NAME} ${HEX})
+message(status "Successfully built MM-control-01.hex!")