build(tinyusb-cmake): xiao-samd21 and nrf52840 recipes pull midi2 via FetchContent

Mirror of the Pico SDK migration for the two TinyUSB native CMake
recipes. Drop ${MIDI2_CPP_ROOT}/src/midi2.c from the local
midi2_cpp helper library and link midi2::midi2 instead. The
FetchContent block is identical so all CMake recipes share the
same MIDI2_LOCAL_PATH override semantics.

Author: sauloverissimo

examples/nrf52840-promicro-midi2/CMakeLists.txt

@@ -73,12 +73,30 @@ family_initialize_project(${PROJECT_NAME} ${CMAKE_CURRENT_LIST_DIR})
 # midi2_cpp parent library (consumed via ../../src, not vendored)
 # ----------------------------------------------------------------------
 set(MIDI2_CPP_ROOT "${CMAKE_CURRENT_SOURCE_DIR}/../..")
+
+# midi2 C99 core, pulled externally so the recipe shares one source
+# of truth with the rest of the ecosystem. Override with
+# -DMIDI2_LOCAL_PATH=/path/to/midi2 for offline builds.
+include(FetchContent)
+if(NOT TARGET midi2)
+    if(DEFINED MIDI2_LOCAL_PATH)
+        FetchContent_Declare(midi2 SOURCE_DIR ${MIDI2_LOCAL_PATH})
+    else()
+        FetchContent_Declare(midi2
+            GIT_REPOSITORY https://github.com/sauloverissimo/midi2.git
+            GIT_TAG        v0.3.2
+            GIT_SHALLOW    TRUE
+        )
+    endif()
+    FetchContent_MakeAvailable(midi2)
+endif()
+
 add_library(midi2_cpp STATIC
-    ${MIDI2_CPP_ROOT}/src/midi2.c
     ${MIDI2_CPP_ROOT}/src/midi2_device.cpp
     ${MIDI2_CPP_ROOT}/src/midi2_ci.cpp
 )
 target_include_directories(midi2_cpp PUBLIC ${MIDI2_CPP_ROOT}/src)
+target_link_libraries(midi2_cpp PUBLIC midi2::midi2)
 target_compile_features(midi2_cpp PUBLIC cxx_std_17)
 target_compile_options(midi2_cpp PRIVATE -fno-rtti -fno-exceptions -fno-use-cxa-atexit)
 

examples/xiao-samd21-midi2/CMakeLists.txt

@@ -63,12 +63,30 @@ family_initialize_project(${PROJECT_NAME} ${CMAKE_CURRENT_LIST_DIR})
 # midi2_cpp parent library (consumed via ../../src, not vendored)
 # ----------------------------------------------------------------------
 set(MIDI2_CPP_ROOT "${CMAKE_CURRENT_SOURCE_DIR}/../..")
+
+# midi2 C99 core, pulled externally so the recipe shares one source
+# of truth with the rest of the ecosystem. Override with
+# -DMIDI2_LOCAL_PATH=/path/to/midi2 for offline builds.
+include(FetchContent)
+if(NOT TARGET midi2)
+    if(DEFINED MIDI2_LOCAL_PATH)
+        FetchContent_Declare(midi2 SOURCE_DIR ${MIDI2_LOCAL_PATH})
+    else()
+        FetchContent_Declare(midi2
+            GIT_REPOSITORY https://github.com/sauloverissimo/midi2.git
+            GIT_TAG        v0.3.2
+            GIT_SHALLOW    TRUE
+        )
+    endif()
+    FetchContent_MakeAvailable(midi2)
+endif()
+
 add_library(midi2_cpp STATIC
-    ${MIDI2_CPP_ROOT}/src/midi2.c
     ${MIDI2_CPP_ROOT}/src/midi2_device.cpp
     ${MIDI2_CPP_ROOT}/src/midi2_ci.cpp
 )
 target_include_directories(midi2_cpp PUBLIC ${MIDI2_CPP_ROOT}/src)
+target_link_libraries(midi2_cpp PUBLIC midi2::midi2)
 target_compile_features(midi2_cpp PUBLIC cxx_std_17)
 # midi2_cpp uses std::function / std::array; exceptions stay off (default
 # in arm-none-eabi-gcc with -fno-exceptions which TinyUSB build sets).