AR9331芯片的 WIFI视频数传模块SDK使用说明

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本教程是AR9331芯片的 WIFI视频数传模块SDK使用说明，其他的芯片型号的模块，例如Robot-Link V3.0 RT模块也是大同小异，请参考着学习。
首先到这里下载Robot-Link V3.0 RT WIFI视频数传模块的SDK:https://yunpan.cn/Qi2TaUbdt5SnW （提取码：1b07）
在本篇教程里，AR9331的SDK包名为：OpenWrt-SDK-ar71xx-for-linux-i686-gcc-4.6-linaro_uClibc-0.9.33.2
然后放到Linux系统中，用tar命令解压SDK，得到编译环境目录。
此目录结构跟openwrt的目录结构基本一致SDK的目录架构：
song@song-virtual-machine:attitude_adjustment# ls bin/ar71xx/OpenWrt-SDK-ar71xx-for-linux-i686-gcc-4.6-linaro_uClibc-0.9.33.2
bin     Config.in docs            include logs     package   Packages.gz rules.mk staging_dir tmp
build_dir dl       feeds.conf.default LICENSE Makefile Packages README.SDK   scripts   target
原Openwrt编译环境目录架构：
song@song-virtual-machine:attitude_adjustment# ls
bin        build_dir dl    feeds.conf.default LICENSE Makefile README    scripts     target toolchain
BSDmakefile Config.in docs feeds       include          logs   package   rules.mk staging_dir tmp   tools

概述：源码在SDK/pakage目录，生成文件在SDK/bin/ar71xx/packages目录。如果没有SDK/bin/ar71xx/packages目录也可手动创建。SDK/bin/packages目录没用到。
1.在OpenWrt-SDK-ar71xx-for-linux-i686-gcc-4.6-linaro_uClibc-0.9.33.2/package目录下新建helloworld目录

song@song-virtual-machine:package$ ls
helloworld Makefile rules.mk

2.在helloworld目录下新建Makefile文件和src目录

song@song-virtual-machine:helloworld$ ls
Makefile src
此Makefile内容
##############################################
# 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))
3.在src目录下新建helloworld.c文件和Makefile文件，分别如下
#include<stdio.h>
int main(void)
{
     printf("liuviking\n");
     return 0;
}
# 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
4.在OpenWrt-SDK-ar71xx-for-linux-i686-gcc-4.6-linaro_uClibc-0.9.33.2目录下执行编译

song@song-virtual-machine:OpenWrt-SDK-ar71xx-for-linux-i686-gcc-4.6-linaro_uClibc-0.9.33.2$ make V=s

5.成功之后会在OpenWrt-SDK-ar71xx-for-linux-i686-gcc-4.6-linaro_uClibc-0.9.33.2/bin/ar71xx/packages/ 下生产helloworld_1_ar71xx.ipk
song@song-virtual-machine:OpenWrt-SDK-ar71xx-for-linux-i686-gcc-4.6-linaro_uClibc-0.9.33.2$ ls bin/ar71xx/packages/
helloworld_1_ar71xx.ipk Packages Packages.gz

6.拷贝ipk到板子，然后用putty执行
opkg install helloworld_1_ar71xx.ipk

会生成/bin/helloworld

7、在shell里面，执行helloworld，即可看到窗体打印出"liuviking"字样。
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