Overview

This is about how to use Doxygen to maintain the API documents. There are three parts:

• Doxygen configuration and layout.
• A separate file to structure the documents
• Comment properly in source code with Doxygen special commands

Setup Doxygen

Doxygen Manual

• Download and install Doxygen
• Install graphviz
  • on macOS, run “brew install graphviz”
  • on Linux, run “sudo apt install graphviz”
• Go to the root directory of “amazon-freertos” (this will be referenced as $ROOT_AFR_DIR)
  • cd $ROOT_AFR_DIR
• Run generate_doc.sh to generate the documents. All warnings will go to $ROOT_AFR_DIR/doxygen_warnings.txt.

  $ ./doc/generate_doc.sh .
  

  This script runs on macOS, Linux, and Windows Subsystem for Linux (WSL).
• The entry document is $ROOT_AFR_DIR/doc/output/main/index.html, open it with a browser and verify that it looks good.

Add documents for a new library

Let's say the library name is “Foo”

1. Doxygen configuration and layout

create a new configuration file for “Foo”

The new configuration's path is $ROOT_AFR_DIR/doc/config/foo

Copy below as content:

• [REQUIRED] update the library name accordingly (anywhere appear as “foo” below)
• [REQUIRED] update “INPUT” configuration
• [REQUIRED] update “EXAMPLE_PATH” configuraton
• [OPTIONAL] update “FILE_PATTERNS” configuration if new file extension is introduced

# Include common configuration options.
@INCLUDE_PATH = doc/config
@INCLUDE = common

# Basic project information.
PROJECT_NAME = "Foo"

# Library documentation output directory.
HTML_OUTPUT = foo

# Generate Doxygen tag file for this library.
GENERATE_TAGFILE = doc/output/foo.tag

# Directories containing library source code.
INPUT = [The source files path]

# Library file names.
FILE_PATTERNS = *.h *.c *.txt

EXAMPLE_PATH = [The source files path]

# External tag files required by this library.
TAGFILES = doc/output/main.tag=../main \

2. A separate file to structure the documents

The path to put this txt file: $ROOT_AFR_DIR/doc/lib/foo.txt

In the following sections, follow each of them and append the content to the txt file.

denote mainpage

/**
@mainpage
*/

add configuration page

TODO: this section is copy-pasted currently. Need a better way.

/**
@config_page{Foo}
@config_brief{library}

@section ......
@brief ......

......

@configpossible ......
@configrecommended ......
@configdefault ......
*/

add constant page

/**
@constants_page{Foo}
@constants_brief{library}

@section foo_constants_single Single Value Constants
- @ref ......

@section foo_constants_multiple Multiple Values Constants
- @ref ......
*/

add function page

/**
@functions_page{foo, Foo}
@functions_brief{foo}
- @function_name{foo_function_socket}
- @function_brief{foo_function_socket}
*/

/**
@page foo_function_func FOO_func
@snippet aws_foo.h declare_foo_func
@copydoc FOO_func"
*/

add data type page

/**
@handles_group{Foo}
@handles_brief{library}

@paramstructs_group{Foo}
@paramstructs_brief{Foo, Foo library}
*/

3. Comment properly in source code with Doxygen special commands

add @[] declaration block to functions

/* @[declare_foo_func] */
void FOO_func();
/* @[declare_foo_func] */

add @ingroup to data types

@ingroup Foo_datatypes_handles

@ingroup Foo_datatypes_enums

@ingroup Foo_datatypes_paramstructs

add @anchor and @name to group of constants

/**
 * @anchor AGroupOfConstants
 * @name AGroupOfConstants
 * ...
 */

/**@{ */

 #define Constants_1
 #define Constants_2  

/**@} */