Add .cmake files to support out-of-tree projects

drivers/st7789/st7789.cmake

@@ -0,0 +1,5 @@
+add_library(st7789
+    ${CMAKE_CURRENT_LIST_DIR}/st7789.cpp)
+
+# Pull in pico libraries that we need
+target_link_libraries(st7789 pico_stdlib hardware_spi hardware_pwm hardware_dma)

libraries/pico_explorer/pico_explorer.cmake

@@ -0,0 +1,13 @@
+include(${CMAKE_CURRENT_LIST_DIR}/../../drivers/st7789/st7789.cmake)
+include(${CMAKE_CURRENT_LIST_DIR}/../pico_graphics/pico_graphics.cmake)
+
+add_library(pico_explorer INTERFACE)
+
+target_sources(pico_explorer INTERFACE
+  ${CMAKE_CURRENT_LIST_DIR}/pico_explorer.cpp
+)
+
+target_include_directories(pico_explorer INTERFACE ${CMAKE_CURRENT_LIST_DIR})
+
+# Pull in pico libraries that we need
+target_link_libraries(pico_explorer INTERFACE pico_stdlib hardware_pwm hardware_adc st7789 pico_graphics)

libraries/pico_graphics/pico_graphics.cmake

@@ -0,0 +1,4 @@
+add_library(pico_graphics 
+    ${CMAKE_CURRENT_LIST_DIR}/types.cpp
+    ${CMAKE_CURRENT_LIST_DIR}/font_data.cpp
+    ${CMAKE_CURRENT_LIST_DIR}/pico_graphics.cpp)