Add pio/ir_nec (#129)

Co-authored-by: martin <admin@crossleys.biz>

pio/ir_nec/nec_transmit_library/CMakeLists.txt

@@ -0,0 +1,20 @@
+# build a normal library
+#
+add_library(nec_transmit_library nec_transmit.c)
+
+# invoke pio_asm to assemble the PIO state machine programs
+#
+pico_generate_pio_header(nec_transmit_library ${CMAKE_CURRENT_LIST_DIR}/nec_carrier_burst.pio)
+pico_generate_pio_header(nec_transmit_library ${CMAKE_CURRENT_LIST_DIR}/nec_carrier_control.pio)
+
+target_link_libraries(nec_transmit_library PRIVATE
+        pico_stdlib
+        hardware_pio
+        )
+
+# add the `binary` directory so that the generated headers are included in the project
+#
+target_include_directories (nec_transmit_library PUBLIC
+	${CMAKE_CURRENT_SOURCE_DIR}
+	${CMAKE_CURRENT_BINARY_DIR}
+	)