init

CMakeLists.txt

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+idf_component_register(SRCS "blk_box.c"
+                    INCLUDE_DIRS "include")

blk_box.c

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+#include <stdio.h>
+#include "blk_box.h"
+
+void func(void)
+{
+    
+}

idf_component.yml

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+## IDF Component Manager Manifest File
+dependencies:
+  ## Required IDF version
+  idf:
+    version: ">=6.0.0"
+  # # Put list of dependencies here
+  # # For components maintained by Espressif:
+  # component: "~1.0.0"
+  # # For 3rd party components:
+  # username/component: ">=1.0.0,<2.0.0"
+  # username2/component2:
+  #   version: "~1.0.0"
+  #   # For transient dependencies `public` flag can be set.
+  #   # `public` flag doesn't have an effect dependencies of the `main` component.
+  #   # All dependencies of `main` are public by default.
+  #   public: true

include/blk_box.h

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+void func(void);