setup project

main/CMakeLists.txt

@@ -1,3 +1,3 @@
-idf_component_register(SRCS "hello_world_main.c"
+idf_component_register(SRCS "main.cpp"
                        PRIV_REQUIRES spi_flash
                        INCLUDE_DIRS "")

main/idf_component.yml

@@ -0,0 +1,16 @@
+## 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

main/main.cpp

@@ -13,7 +13,7 @@
 #include "esp_flash.h"
 #include "esp_system.h"
 
-void app_main(void)
+extern "C" void app_main(void)
 {
     printf("Hello world!\n");