【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