examples/usercmodule: Add micropython.cmake to the C and CPP examples.

examples/usercmodule/micropython.cmake:

Root micropython.cmake file is responsible for including modules.

examples/usercmodule/cexample/micropython.cmake:
examples/usercmodule/cppexample/micropython.cmake:

Module micropython.cmake files define the target and link it to usermod.

Signed-off-by: Phil Howard <phil@pimoroni.com>

examples/usercmodule/cexample/micropython.cmake

@@ -0,0 +1,21 @@
+# Create an INTERFACE library for our C module.
+add_library(usermod_cexample INTERFACE)
+
+# Add our source files to the lib
+target_sources(usermod_cexample INTERFACE
+    ${CMAKE_CURRENT_LIST_DIR}/examplemodule.c
+)
+
+# Add the current directory as an include directory.
+target_include_directories(usermod_cexample INTERFACE
+    ${CMAKE_CURRENT_LIST_DIR}
+)
+
+# Enable the module automatically by adding the relevant compile definitions.
+target_compile_definitions(usermod_cexample INTERFACE
+    MODULE_CEXAMPLE_ENABLED=1
+)
+
+# Link our INTERFACE library to the usermod target.
+target_link_libraries(usermod INTERFACE usermod_cexample)
+

examples/usercmodule/cppexample/micropython.cmake

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+# Create an INTERFACE library for our CPP module.
+add_library(usermod_cppexample INTERFACE)
+
+# Add our source files to the library.
+target_sources(usermod_cppexample INTERFACE
+    ${CMAKE_CURRENT_LIST_DIR}/example.cpp
+    ${CMAKE_CURRENT_LIST_DIR}/examplemodule.c
+)
+
+# Add the current directory as an include directory.
+target_include_directories(usermod_cppexample INTERFACE
+    ${CMAKE_CURRENT_LIST_DIR}
+)
+
+# Enable the module automatically by adding the relevant compile definitions.
+target_compile_definitions(usermod_cppexample INTERFACE
+    MODULE_CPPEXAMPLE_ENABLED=1
+)
+
+# Link our INTERFACE library to the usermod target.
+target_link_libraries(usermod INTERFACE usermod_cppexample)
+

examples/usercmodule/micropython.cmake

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+# This top-level micropython.cmake is responsible for listing
+# the individual modules we want to include.
+# Paths are absolute, and ${CMAKE_CURRENT_LIST_DIR} can be
+# used to prefix subdirectories.
+
+# Add the C example.
+include(${CMAKE_CURRENT_LIST_DIR}/cexample/micropython.cmake)
+
+# Add the CPP example.
+include(${CMAKE_CURRENT_LIST_DIR}/cppexample/micropython.cmake)
+