nuttx app添加自己的小应用程序

nuttx想要添加自己写的一些小应用非常方便，具体的步骤如下：
1，在apps/examples/目录下添加自己的目录。
2，添加Kconfig, Makefile, Make.defs, 以及应用的源文件。
3，通过build.sh menuconfig去选择自己添加的app即可。
4，将编译好的版本下载到板子中，在nuttx shell试图下执行？回车即可看到自己添加的小应用。在shell下输入自己添加的小应用的名字回车既可运行程序。

首先我们如果想添加一些自己的小程序需要在apps/examples/目录下添加自己的app目录，以apps/examples/hello为例：
我们需要添加hello_main.c, Kconfig, Make.defs, Makefile这四个文件。

Kconfig的内容如下。

#
# For a description of the syntax of this configuration file,
# see the file kconfig-language.txt in the NuttX tools repository.
#config EXAMPLES_HELLO      改名字是用来在defconfig中配置使用的。添加该配置之后，该应用会被打开。tristate "\"Hello, World!\" example"  这个是在menuconfig中看到的选项提示default n             默认是不打开---help---Enable the \"Hello, World!\" exampleif EXAMPLES_HELLO 如果打开该选项就进行下面的配置。config EXAMPLES_HELLO_PROGNAME      app的名字string "Program name"default "hello"---help---This is the name of the program that will be used when the NSH ELFprogram is installed.config EXAMPLES_HELLO_PRIORITY       设置栈的优先级int "Hello task priority"default 100config EXAMPLES_HELLO_STACKSIZE        设置栈的大小int "Hello stack size"default DEFAULT_TASK_STACKSIZEendif

Make.defs的内容如下。

############################################################################
# apps/examples/hello/Make.defs
# Adds selected applications to apps/ build
#
#   Copyright (C) 2015 Gregory Nutt. All rights reserved.
#   Author: Gregory Nutt <gnutt@nuttx.org>
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in
#    the documentation and/or other materials provided with the
#    distribution.
# 3. Neither the name NuttX nor the names of its contributors may be
#    used to endorse or promote products derived from this software
#    without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
############################################################################ifneq ($(CONFIG_EXAMPLES_HELLO),)   需要注意该名字需要和Kconfig的一致性
CONFIGURED_APPS += $(APPDIR)/examples/hello           这个是hello这个app所在的目录。
endif

Makefile的内容：

############################################################################
# apps/examples/hello/Makefile
#
#   Copyright (C) 2008, 2010-2013 Gregory Nutt. All rights reserved.
#   Author: Gregory Nutt <gnutt@nuttx.org>
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in
#    the documentation and/or other materials provided with the
#    distribution.
# 3. Neither the name NuttX nor the names of its contributors may be
#    used to endorse or promote products derived from this software
#    without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
############################################################################include $(TOPDIR)/Make.defs# Hello, World! built-in application infoPROGNAME  = $(CONFIG_EXAMPLES_HELLO_PROGNAME)  PROGNAME设置为在Kconfig中配置的名字
PRIORITY  = $(CONFIG_EXAMPLES_HELLO_PRIORITY)  优先级设置为Kconfig中的配置
STACKSIZE = $(CONFIG_EXAMPLES_HELLO_STACKSIZE) 栈大小设置为Kconfig给hello配置的大小
MODULE    = $(CONFIG_EXAMPLES_HELLO)           模块也是Kconfig中的配置名称# Hello, World! ExampleMAINSRC = hello_main.c         main src文件是hello.c文件include $(APPDIR)/Application.mk

hello_main.c的内容：

/***************************************************************************** Included Files****************************************************************************/#include <nuttx/config.h>        需要注意的一点是通常我们会在我们添加的app源文件的顶部添加该头文件的引用。
#include <stdio.h>/***************************************************************************** Public Functions****************************************************************************//***************************************************************************** hello_main****************************************************************************/int main(int argc, FAR char *argv[])
{printf("Hello, World!!\n");return 0;
}

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