initial commit

libraries/Adafruit_BusIO/CMakeLists.txt

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+# Adafruit Bus IO Library
+# https://github.com/adafruit/Adafruit_BusIO
+# MIT License
+
+cmake_minimum_required(VERSION 3.5)
+
+idf_component_register(SRCS "Adafruit_I2CDevice.cpp" "Adafruit_BusIO_Register.cpp" "Adafruit_SPIDevice.cpp" "Adafruit_GenericDevice.cpp"
+                       INCLUDE_DIRS "."
+                       REQUIRES arduino-esp32)
+
+project(Adafruit_BusIO)