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ESP-IDF build: give Panel_LT8912B the M5Unified headers when that component is in the build #289

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ESP-IDF build: give Panel_LT8912B the M5Unified headers when that component is in the build #289

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33 changes: 33 additions & 0 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -79,3 +79,36 @@ if(_m5gfx_arduino_enabled)
target_link_libraries(${COMPONENT_LIB} PUBLIC ${_m5gfx_arduino_lib})
endif()
endif()

# Panel_LT8912B (the PoE-P4 display output board) talks to the bridge through M5Unified's I2C_Class, which it
# picks up with __has_include(<utility/I2C_Class.hpp>). In an ESP-IDF build that header is only
# visible when this library is given M5Unified's source directory, so add it whenever an
# M5Unified component is part of the build (headers only; the symbols resolve at link time as
# the component libraries are linked as one group).
# M5GFX_M5UNIFIED_COMPONENT=<name> use a differently named M5Unified component
# M5GFX_M5UNIFIED_COMPONENT=OFF disable the automatic include path
set(_m5gfx_m5unified_candidates M5Unified m5unified m5stack__m5unified)
set(_m5gfx_m5unified_enabled ON)
if(DEFINED M5GFX_M5UNIFIED_COMPONENT AND NOT "${M5GFX_M5UNIFIED_COMPONENT}" STREQUAL "")
if(M5GFX_M5UNIFIED_COMPONENT)
set(_m5gfx_m5unified_candidates ${M5GFX_M5UNIFIED_COMPONENT})
else()
set(_m5gfx_m5unified_enabled OFF)
endif()
endif()
if(_m5gfx_m5unified_enabled)
idf_build_get_property(_m5gfx_m5unified_build_components BUILD_COMPONENTS)
set(_m5gfx_m5unified_hits)
foreach(_m5gfx_m5unified_name ${_m5gfx_m5unified_candidates})
if(_m5gfx_m5unified_name IN_LIST _m5gfx_m5unified_build_components)
list(APPEND _m5gfx_m5unified_hits ${_m5gfx_m5unified_name})
endif()
endforeach()
list(LENGTH _m5gfx_m5unified_hits _m5gfx_m5unified_count)
if(_m5gfx_m5unified_count GREATER 1)
message(FATAL_ERROR "M5GFX: several M5Unified components are in the build (${_m5gfx_m5unified_hits}). Set M5GFX_M5UNIFIED_COMPONENT to the one to use.")
elseif(_m5gfx_m5unified_count EQUAL 1)
idf_component_get_property(_m5gfx_m5unified_dir ${_m5gfx_m5unified_hits} COMPONENT_DIR)
target_include_directories(${COMPONENT_LIB} PRIVATE ${_m5gfx_m5unified_dir}/src)
endif()
endif()
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