Application Folder
==================
This folder provides various applications found in sub-directories.
Application entry points with their requirements are gathered together in
in two files:
- namedapp/namedapp_proto.h Entry points, prototype function
- namedapp/namedapp_list.h Application specific information and requirements
The build occurs in several phases as different build targets are executed:
(1) contex, (2) depend, and (3) default (all). Application information is
collected during the make context build phase.
To execute an application function:
exec_namedapp() is defined in the nuttx/include/apps/apps.h
NuttShell provides transparent method of invoking the command, when the
following option is enabled:
CONFIG_NSH_BUILTIN_APPS=y
in the NuttX configuration.
A special configuration file is used to configure which applications
are to be included in the build. This file is configs/<board>/<configuration>/appconfig.
The existence of the appconfig file in the board configuration directory
is sufficient to enable building of applications.
The appconfig file is copied into the apps/ directory as .config when
NuttX is configured. .config is included in the toplevel apps/Makefile.
As a minimum, this configuration file must define files to add to the
CONFIGURED_APPS list like:
CONFIGURED_APPS += hello poweroff jvm
The form of each entry is <dir>=<dependency> when:
<dir> is the name of a subdirectory in the apps directory, and
<dependency> is a make dependency. This will be "touch"-ed each time
that the sub-directory is rebuilt.
When the user defines an option:
CONFIG_BUILTIN_APP_START=<application name>
that application shall be invoked immediately after system starts.
Note that application name must be provided in ".." as: "hello",
will call:
int hello_main(int argc, char *argv[])
Application skeleton can be found under the hello sub-directory,
which shows how an application can be added to the project. One must
define:
1. create sub-directory as: appname
2. provide entry point: appname_main()
3. set the requirements in the file: Makefile, specially the lines:
APPNAME = appname
PRIORITY = SCHED_PRIORITY_DEFAULT
STACKSIZE = 768
ASRCS = asm source file list as a.asm b.asm ...
CSRCS = C source file list as foo1.c foo2.c ..
4. add application in the apps/Makefile
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