• 【转】OpenWRT开发自定义应用方法


    【转】OpenWRT开发自定义应用方法

    转自:http://blog.csdn.net/rudyn/article/details/38616783

      OpenWRT编译成功完成后,所有的产品都会放在编译根目录下的bin/{TARGET}/,例如:我所编译的产物都放在./bin/ar74xx/下,其中有一个packages文件夹:里面包含了我们在配置文件里设定的所有编译好的软件包。默认情况下,会有默认选择的软件包。需要主要的是,编译完成后,一定要将编译好的bin目录进行备份。

      在编译根目录下会有一个dl的目录,这个目录其实是“download”的简写,在编译前期,需要从网络下载的数据包都会放在这个目录下,这些软件包的一个特点就是,会自动安装在所编译的固件中,也就是我们make menuconfig的时候,为固件配置的一些软件包。如果我们需要更改这些源码包,只需要将更改好的源码包打包成相同的名字放在这个目录下,然后开始编译即可。编译时,会将软件包解压到build_dir目录下。当然,你也可以自己在dl里面创建自己的软件包,然后更改相关的配置文件,让openwrt可以识别这个文件包。

      新建和编译自己的packages:

      对于自己新建的package,而这个package又不需要随固件一起安装,换句话说,就是可以当做一个可选软件包的话。我们可以利用我们的SDK环境来单独编译,编译后会生成一个ipk的文件包。然后利用opkg install xxx.ipk 来安装这个软件,在package文件夹里面新建Helloworld,建立源码目录:

    cd package
    mkdir Helloworld ; cd Helloworld
    mkdir src
    touch src/Makefile   /* Helloworld 编译Makefile */
    touch ./Makefile /*建立顶层Makefile,这个Makefile文件是OpenWRT读的*/
    

      Helloworld.c程序:

    /**************** 
    * Helloworld.c 
    *****************/  
      
    #include <stdio.h>  
    #include <unistd.h>  
    int main(void)  
    {  
         printf("Hello world
    ");  
         return 0;  
    }  
    

      编辑Helloworld的编译Makefile:

    # build helloworld executable when user executes "make"  
      
    helloworld: helloworld.o  
            $(CC) $(LDFLAGS) helloworld.o -o helloworld  
      
    helloworld.o: helloworld.c  
            $(CC) $(CFLAGS) -c helloworld.c  
      
    # remove object files and executable when user executes "make clean"  
    clean:  
            rm *.o helloworld  
    

      编写模块编译Makefile:

    Makefile文件模板内容如下:  
    ##############################################  
    # OpenWrt Makefile for helloworld program  
    #  
    #  
    # Most of the variables used here are defined in  
    # the include directives below. We just need to  
    # specify a basic description of the package,  
    # where to build our program, where to find  
    # the source files, and where to install the  
    # compiled program on the router.  
    #  
    # Be very careful of spacing in this file.  
    # Indents should be tabs, not spaces, and  
    # there should be no trailing whitespace in  
    # lines that are not commented.  
    #  
    ##############################################  
      
    include $(TOPDIR)/rules.mk  
      
    # Name and release number of this package  
    PKG_NAME:=helloworld  
    PKG_RELEASE:=1  
      
      
    # This specifies the directory where we're going to build the program.   
    # The root build directory, $(BUILD_DIR), is by default the build_mipsel  
    # directory in your OpenWrt SDK directory  
    PKG_BUILD_DIR := $(BUILD_DIR)/$(PKG_NAME)  
      
      
    include $(INCLUDE_DIR)/package.mk  
      
       
      
    # Specify package information for this program.  
    # The variables defined here should be self explanatory.  
    # If you are running Kamikaze, delete the DESCRIPTION  
    # variable below and uncomment the Kamikaze define  
    # directive for the description below  
    define Package/helloworld  
            SECTION:=utils  
            CATEGORY:=Utilities  
            TITLE:=Helloworld -- prints a snarky message  
    endef  
      
      
    # Uncomment portion below for Kamikaze and delete DESCRIPTION variable above  
    define Package/helloworld/description  
            If you can't figure out what this program does, you're probably  
            brain-dead and need immediate medical attention.  
    endef  
      
       
      
    # Specify what needs to be done to prepare for building the package.  
    # In our case, we need to copy the source files to the build directory.  
    # This is NOT the default.  The default uses the PKG_SOURCE_URL and the  
    # PKG_SOURCE which is not defined here to download the source from the web.  
    # In order to just build a simple program that we have just written, it is  
    # much easier to do it this way.  
    define Build/Prepare  
            mkdir -p $(PKG_BUILD_DIR)  
            $(CP) ./src/* $(PKG_BUILD_DIR)/  
    endef  
      
      
    # We do not need to define Build/Configure or Build/Compile directives  
    # The defaults are appropriate for compiling a simple program such as this one  
      
      
    # Specify where and how to install the program. Since we only have one file,  
    # the helloworld executable, install it by copying it to the /bin directory on  
    # the router. The $(1) variable represents the root directory on the router running  
    # OpenWrt. The $(INSTALL_DIR) variable contains a command to prepare the install  
    # directory if it does not already exist.  Likewise $(INSTALL_BIN) contains the  
    # command to copy the binary file from its current location (in our case the build  
    # directory) to the install directory.  
    define Package/helloworld/install  
            $(INSTALL_DIR) $(1)/bin  
            $(INSTALL_BIN) $(PKG_BUILD_DIR)/helloworld $(1)/bin/  
    endef  
      
      
    # This line executes the necessary commands to compile our program.  
    # The above define directives specify all the information needed, but this  
    # line calls BuildPackage which in turn actually uses this information to  
    # build a package.  
    $(eval $(call BuildPackage,helloworld)) 
    

      

    返回目录最顶层,执行make menuconfig,在utils中选中刚加的模块名(这里是根据sections中定义的),保存.config。

    执行make.

    如果要单独编译模块:

    makepackage/helloworld/compile
    make package/helloworld/install
    

      

    编译结果会放在bin/{TARGET}/package目录下:helloworld*.ipk

    利用tftp将ipk文件上传到板子里面,用opkg install 命令加载模块,加载成功后执行helloworld,这时就是执行之前编写的helloworld程序

    参考资料:http://wenku.baidu.com/view/31a903befd0a79563c1e7275.html

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  • 原文地址:https://www.cnblogs.com/happygirl-zjj/p/6372564.html
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