setup driver

drivers/CMakeLists.txt

@@ -0,0 +1,5 @@
+set(SOURCES 
+    "i2c.cpp"
+)
+
+target_sources(${COMPONENT_LIB} PRIVATE ${SOURCES})

drivers/i2c.cpp

@@ -0,0 +1,5 @@
+#include "stdio.h"
+
+void i2c_test() {
+    printf("initializing i2c or something\n");
+}