标签：linux驱动

1、前期准备工作

a. 安装交叉编译链
  我使用的是arm-linux-gcc 4.3.2，解压到目录/usr/local/arm/4.3.2，然后在环境变量PATH中增加/usr/local/arm/4.3.2/bin

b. 安装CMake
  Opencv 2.0之后的版本，必须使用CMake创建Makefile。我使用的CMake版本是2.8.2，解压到目录/usr/local/cmake-2.8.2-Linux-i386，然后在环境变量PATH中增加/usr/local/cmake-2.8.2-Linux-i386/bin

2、编译Opencv

1、解压Opencv 2.4.9

2、创建build目录，作为CMake编译arm版本的工作目录

3、在X环境下，运行cmake-gui（如果没装的话，按照提示安装一个）
   选择源代码目录
   选择Build目录：

点击Configure，保持generator为Unix Makefiles，选择Specify options for cross-compiling，点击Next
Operating System填写arm-inux

点击NEXT再跳出的界面中做如下设置

Operating System 选择目标系统arm-linux

Compilers中选择交叉编译器的gcc和g++

Target Root选择交叉编译器的路径

程序库的Target Root填写/usr/local/arm/，然后点击Finish

点击Finish按钮，开始生成配置文件，但是这个时候会报错

System is unknown to cmake, create:

Platform/arm-linux to use this system, please send your config file to cmake@www.cmake.org so it can be added to cmake

但是这个时候还有其他错误

CMake Error at cmake/FindCUDA.cmake:763 (if):

if given arguments:

"CUDA_VERSION" "VERSION_GREATER" "5.0" "AND" "CMAKE_CROSSCOMPILING" "AND" "MATCHES" "arm"

Unknown arguments specified

Call Stack (most recent call first):

cmake/OpenCVDetectCUDA.cmake:26 (find_package)

cmake/OpenCVFindLibsPerf.cmake:24 (include)

CMakeLists.txt:468 (include)

修改默认配置，默认安装目录为/usr/local，由于我之前有装x86版的opencv,所以对于交叉编译的库来说并不合适，所以我把CMAKE_INSTALL_PREFIX变量改为/usr/local/arm/

4、 点击Generate生成Makefile

(1)如果你现在make，是肯定会出错的！（不修改，可能白等了至少15分钟，前车之鉴）

../../lib/libopencv_core.so: undefined reference to `pthread_spin_init‘

../../lib/libopencv_core.so: undefined reference to `pthread_spin_unlock‘
../../lib/libopencv_core.so: undefined reference to `pthread_spin_lock‘
../../lib/libopencv_core.so: undefined reference to `pthread_spin_destroy‘
../../lib/libopencv_core.so: undefined reference to `pthread_once‘
../../lib/libopencv_core.so: undefined reference to `clock_gettime‘
../../lib/libopencv_core.so: undefined reference to `pthread_spin_trylock‘

原因是找不到pthread链接库，打开文件夹下的CmakeCache.txt进行修改

//Flags used by the linker.(大概在194行附近)
CMAKE_EXE_LINKER_FLAGS:STRING=-lpthread -lrt  

5、make

6、sudo make install

3、测试opencv库是否安装正确

#include "cv.h"
#include"highgui.h"
const char*picture = "lena.jpg";
int main(int argc,char** argv)
{
	IplImage *pImage=cvLoadImage(picture,1);
	cvNamedWindow("Test",CV_WINDOW_AUTOSIZE);
	cvShowImage("Test",pImage);
	cvWaitKey(0);
	cvReleaseImage(&pImage);
	cvDestroyWindow("Test");
}

all:test
CFLAGS=-Wall
OPENCV_INCLUDE=-I /usr/local/arm/include/opencv
CC = arm-linux-g++
OPENCV_LINK =-L/usr/local/arm/lib -lcv -lcxcore -lhighgui -lpthread -lrt
%:%.cpp
#$(CC) `pkg-config opencv --libs` $(OPENCV_INCLUDE) $< -o $@ $(OPENCV_LINK)
	$(CC) $(OPENCV_INCLUDE) $< -o $@ $(OPENCV_LINK)
.PHONY:clean
clean:
	rm -f test

首先复制主机/usr/local/arm/lib//下面的全部.so文件到嵌入式根文件系统的/lib/目录下，再复制我们编译的test到嵌入式系统/opt/myworks/目录下（并确保文件test属性为可执行），如果test可正常运行没有报告缺少库文件，说明我们编译的arm-linux版OpenCV库已经可以正常使用。

Opencv-2.49在mini2440上的移植

标签：linux驱动

原文地址：http://blog.csdn.net/xy010902100449/article/details/45092757