setup cpp

CMakeLists.txt

@@ -1,2 +1,4 @@
-idf_component_register(SRCS "blk_box.c"
-                    INCLUDE_DIRS "include")
+idf_component_register(
+    SRCS "blk_box.cpp"
+    INCLUDE_DIRS "include"
+)

blk_box.c

@@ -1,7 +0,0 @@
-#include <stdio.h>
-#include "blk_box.h"
-
-void func(void)
-{
-    
-}

blk_box.cpp

@@ -0,0 +1,6 @@
+#include <stdio.h>
+#include "blk_box.h"
+
+const char* get_hello_world() {
+    return "hello, world!";
+}

include/blk_box.h

@@ -1 +1 @@
-void func(void);
+const char* get_hello_world();