347 lines
9.7 KiB
ReStructuredText
347 lines
9.7 KiB
ReStructuredText
==================
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Custom Apps How-to
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==================
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Nuttx comes with a large number of Apps but, most likely, you will want to add your own.
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There are various different options for this depending on your requirements.
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#. Replace the apps/ directory completely
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#. Extend the apps/ directory to include a new custom directory
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#. Include an additional custom directory outside of the main source trees
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The following sections explain these 3 methods using a ``CustomHello.c`` app and
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the directory ``CustomApps`` as an example.
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.. Tip::
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If you make errors while setting this up and the build fails, it is most likely you'll
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need to run ``make clean`` and possibly even ``make distclean`` before rebuilding to
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ensure it works correctly.
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-----------------------------------------
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1. Replace The Apps/ Directory Completely
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-----------------------------------------
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The CustomApps directory need only to contain the minimum three files:
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* ``Makefile``
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* ``Kconfig``
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* ``CustomHello.c``
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1.1 Makefile
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------------
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The custom application directory must include a Makefile to make all of the targets
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expected by the NuttX build and must generate an archive called libapps.a in the
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top-level of the custom directory structure.
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The Makefile has just those minimum required targets:
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.. code-block:: console
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APPDIR = ${shell pwd}
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-include $(TOPDIR)/Make.defs
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# files
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CSRCS = CustomHello.c
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COBJS = CustomHello.o
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ROOTDEPPATH = --dep-path .
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# Build targets
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all: libapps.a
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.PHONY: dirlinks context preconfig depend clean clean_context distclean
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.PRECIOUS: libapps$(LIBEXT)
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# Compile C Files
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$(COBJS): %$(OBJEXT): %.c
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$(call COMPILE, $<, $@)
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# Add object files to the apps archive
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libapps.a: $(COBJS)
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$(call ARCHIVE, libapps.a, $(COBJS))
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# Create directory links
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dirlinks:
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# Setup any special pre-build context
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context:
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# Setup any special pre-configuration context
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preconfig:
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# Make the dependency file, Make.deps
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depend: Makefile $(CSRCS)
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$(Q) $(MKDEP) $(ROOTDEPPATH) "$(CC)" -- $(CFLAGS) -- $(SRCS) > Make.dep
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# Clean the results of the last build
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clean:
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$(call CLEAN)
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# Remove the build context and directory links
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clean_context:
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# Restore the directory to its original state
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distclean: clean clean_context
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$(call DELFILE, Make.dep)
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# Include dependencies
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-include Make.dep
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1.2 Kconfig
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-----------
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A Kconfig file must be included but need not be populated with any meaningful options.
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This is a place where you can add settings to generate customized builds of your custom
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application and/or choose which of your apps to include.
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In the minimum case, Kconfig is only:
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.. code-block:: console
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# For a description of the syntax of this configuration file,
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# see the file kconfig-language.txt in the NuttX tools repository.
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#
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or
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.. code-block:: console
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# For a description of the syntax of this configuration file,
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# see the file kconfig-language.txt in the NuttX tools repository.
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#
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1.3 CustomHello.c
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-----------------
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The custom application must actually compile some source files in order to generate the required
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libapps.a archive. One of these source files must include the ``main()`` entry point to the
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application.
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The function of this main() entry point simply to bring-up the full application. It is called
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at the completion of OS initialization.
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What this application initialization entry point does, how it interacts with the rest of your
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application, and where the rest of you application code is located is of no concern to the OS.
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Only this one entry point is needed.
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For this "Hello, Custom World!" application ``custom_hello()`` is the application entry point:
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.. code-block:: console
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#include <stdio.h>
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int custom_hello(int argc, char *argv[])
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{
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printf("Hello, Custom World!!\n");
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return 0;
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}
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1.4 Building with the CustomApps Directory
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------------------------------------------
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In order to build with the new custom configuration, you will need the following in your configuration:
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:menuselection:`CONFIG_APPS_DIR="../CustomApps"`
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:menuselection:`CONFIG_USER_ENTRYPOINT="custom_hello"`
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Note that you can only access the ``../CustomApps/Kconfig`` configuration file if ``CONFIG_APPS_DIR`` is set
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to ``../CustomApps`` BEFORE ``make menuconfig`` is executed
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This can be done by
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* hand-editing the .config file before running make menuconfig, which is rarely a good idea
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* Using ``kconfig-tweak --set-str CONFIG_APPS_DIR ../CustomApps``
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* select the CustomApps directory as a command line option at the time the board is configured:
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.. code-block:: console
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./tools/configure.sh -a ../CustomApps <board>:<config>
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or
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.. code-block:: console
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.tools/configure.sh -l ../CustomBoards/MyCustomBoardName/MyCustomConfig
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Then build as you normally would. When you execute the custom_hello app you should see:
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.. code-block:: console
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Hello, Custom World!!
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---------------------------------------------------------------
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2. Extend the apps/ directory to include a new custom directory
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---------------------------------------------------------------
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The collection of apps provided in nuttx-apps can be useful, and this method simply
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extends the directory structure to include your own directory structure.
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The existing /apps makefile automatically checks for the existence of sub-directories
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that contain a ``Makefile`` and ``Make.defs`` file. This example assumes there is likely
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to be more than one custom app, and includes a ``Kconfig`` for the app itself. Inclusion
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of a ``Kconfig`` allows custom App options to be included in the Nuttx configuration
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system, but is optional.
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2.1 Custom Apps Directory
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-------------------------
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Simply create a new directory under the existing apps directory with a name of your choice.
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This example uses the directory name ``CustomApps``.
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2.2 Make.defs
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-------------
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Create this file in the ``CustomApps`` directory, with the following line added:
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.. code-block:: console
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include $(wildcard $(APPDIR)/CustomApps/*/Make.defs)
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2.3 Makefile
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------------
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Create a Makefile in the ``CustomApps`` directory, with the following lines added:
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.. code-block:: console
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MENUDESC = "Custom Apps"
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include $(APPDIR)/Directory.mk
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2.4 CustomHello App
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-------------------
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Create a sub-directory under the ``CustomApps`` directory called ``CustomHello``.
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The same ``CustomHello.c`` file as described above should be created here.
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2.5 CustomHello Makefile
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------------------------
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Create a Makefile in the ``CustomApps/CustomHello`` directory with the following lines:
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.. code-block:: console
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include $(APPDIR)/Make.defs
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# Custom Hello built-in application info
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PROGNAME = $(CONFIG_CUSTOM_APPS_CUSTOM_HELLO_PROGNAME)
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PRIORITY = $(CONFIG_CUSTOM_APPS_CUSTOM_HELLO_PRIORITY)
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STACKSIZE = $(CONFIG_CUSTOM_APPS_CUSTOM_HELLO_STACKSIZE)
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MODULE = $(CONFIG_CUSTOM_APPS_CUSTOM_HELLO)
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# Custom Hello
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MAINSRC = CustomHello.c
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include $(APPDIR)/Application.mk
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2.6 CustomHello Kconfig
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-----------------------
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Create a Kconfig file in the ``CustomApps/CustomHello`` directory, with the following lines. For
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the purposes of this example, the Kconfig will only cover our single application):
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.. code-block:: console
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#
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# For a description of the syntax of this configuration file,
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# see the file kconfig-language.txt in the NuttX tools repository.
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#
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config CUSTOM_APPS_CUSTOM_HELLO
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tristate "Custom Hello App"
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default n
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---help---
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Enable the Custom Hello App
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if CUSTOM_APPS_CUSTOM_HELLO
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config CUSTOM_APPS_CUSTOM_HELLO_PROGNAME
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string "Program name"
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default "custom_hello"
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---help---
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This is the name of the program that will be used when the NSH ELF
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program is installed.
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config CUSTOM_APPS_CUSTOM_HELLO_PRIORITY
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int "Custom Hello task priority"
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default 100
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config CUSTOM_APPS_CUSTOM_HELLO_STACKSIZE
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int "Custom Hello stack size"
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default DEFAULT_TASK_STACKSIZE
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endif
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2.7 Build and Run
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-----------------
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Once these files have been created, run a ``make clean`` (you may need to run ``make distclean``
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followed by ``make menuconfig``. If successful there will be new Kconfig entries.
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:menuselection:`Application Configuraration --> Custom Apps --> Custom Hello App`
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Select the ``Custom Hello App`` and run the usual build process. If successful
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you can run the newly included ``custom_hello`` app.
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--------------------------------------------------------------------------
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3. Include an Additional Custom Cirectory Outside of the Main Source Trees
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--------------------------------------------------------------------------
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Thia is similar to the previous approach, but places the ``CustomApps`` directory
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outside of the default trees.
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3.1 Create Custom Apps directory and a Symbolic Link
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----------------------------------------------------
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Create a directory for the custom apps in a location of your choosing. Then create A
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symbolic link in the main nuttx/apps directory.
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This example assumes this has been placed below the top Nuttx folder, alongside the
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default ``apps`` directory, i.e. ``nuttx/CustomApps``
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.. code-block:: console
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$ pwd
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/home/nuttx
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$ ls -1
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apps
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CustomBoards
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nuttx
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$ mkdir CustomApps
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$ ls -1
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apps
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CustomApps
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CustomBoards
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nuttx
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$ cd apps
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$ ln -s ../CustomApps CustomApps
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3.2 Make.defs etc.
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------------------
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Follow all the steps as in sections 2.2 to 2.7 above, creating the exact same files but
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placing then in the new ``CustomApps`` directory location created as described here.
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