嵌入式系统实验二.docx
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嵌入式系统实验二.docx
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嵌入式系统实验二
实验二嵌入式系统程序设计实验之linux串口和网络编程
一、实验目的:
1、强化本学期所学的相关的内容。
2、掌握串口相关设置。
3、强化基于TCP网络传输的三次握手。
4、自学Linux线程的使用。
二、实验内容:
本试验基于server和client的透明传输来实现类似于QQ的聊天功能。
三、实验过程:
1、linux开发环境的建立
2、嵌入式linux系统的搭建
1>BootLoader的移植
2>linux系统的裁剪与移植
Linux内核裁剪
./make_image生成自己的uImage2638
上电验证:
3>根文件系统的移植
修改hostname为:
whmtt
./mkcramfsdisk_new生成rootfs_new.cramfs
大小从老师给的40000到37b00(因为有的没有用到,大小变小了):
上电验证:
3、客服端编程client.c
相关代码:
#include
#include
#include
#include
#include
#include
#include
#include
#defineSERVER_PORT20000//设置服务端口
#defineCLIENT_PORT((20001+rand())%65536)//设置客户端端口(随机)
#defineBUFFER_SIZE256
#defineLENGTH_OF_LISTEN_QUEUE10//可窃听队列长为10
#defineWELCOME_MESSAGE"welcometoconnecttheserver."
voidusage(char*name)
{
printf("usage:
%sIpAddr\n",name);
}
structsockaddr_inservaddr,cliaddr;
intservfd,clifd,length=0;
structsockaddr_inservaddr,cliaddr;
socklen_tsocklen=sizeof(servaddr);
charbuf[BUFFER_SIZE],buf2[BUFFER_SIZE];
pthread_ttidp,tidp2;
intpth;
intrunflag=0;
void*Thread1(void*arg)/*等待runflag为1,当为1时清空buf,
同时接收来自server的数据并输出。
但当没有清空,则break.*/
{
while(runflag){
memset(buf,0,BUFFER_SIZE);
length=recv(clifd,buf,BUFFER_SIZE,0);
if(strstr(buf,"$")>0){runflag=0;printf("stop!
\n");break;}
if(length>0)printf("fromserver:
%s",buf);
}
}
void*Thread2(void*arg)/*等待发送数据给Server*/
{
printf("PleaseinputyourwordstoServer:
--$tostop\n");
while(runflag){
memset(buf2,0,BUFFER_SIZE);
scanf("%s",buf2);
send(clifd,buf2,strlen(buf2),0);
if(strstr(buf2,"$")>0){runflag=0;printf("stop!
\n");break;}
}
}
intmain(intargc,char**argv)
{
if(argc<2)
{
usage(argv[0]);
exit
(1);
}
if((clifd=socket(AF_INET,SOCK_STREAM,0))<0)//用tcp定义socket
{
printf("createsocketerror!
\n");
exit
(1);
}
srand(time(NULL));//initializerandomgenerator
bzero(&cliaddr,sizeof(cliaddr));
cliaddr.sin_family=AF_INET;
cliaddr.sin_port=htons(CLIENT_PORT);
cliaddr.sin_addr.s_addr=htons(INADDR_ANY);
if(bind(clifd,(structsockaddr*)&cliaddr,sizeof(cliaddr))<0)
{
printf("bindtoport%dfailure!
\n",CLIENT_PORT);
exit
(1);
}//绑定的目的是让其端口是随机的,否则端口是自增1
//一般情况下client端不用绑定
bzero(&servaddr,sizeof(servaddr));
servaddr.sin_family=AF_INET;
inet_aton(argv[1],&servaddr.sin_addr);
servaddr.sin_port=htons(SERVER_PORT);
if(connect(clifd,(structsockaddr*)&servaddr,socklen)<0)
{
printf("can'tconnectto%s!
\n",argv[1]);
exit
(1);
}
runflag=1;
pth=pthread_create(&tidp,NULL,Thread1,NULL);
if(pth!
=0){printf("error!
");return-1;}
pth=pthread_create(&tidp2,NULL,Thread2,NULL);
if(pth!
=0){printf("error!
");return-1;}
pthread_detach(tidp);
pthread_detach(tidp2);
while(runflag){;}
close(clifd);
return0;
}
4、服务端server.c编写
相关代码:
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#defineCOM00
#defineBLOCK_MODE1
#defineNONBLK_MODE0
#defineSERVER_PORT20000
#defineLENGTH_OF_LISTEN_QUEUE10
#defineQUEUE20
#defineBUFFER_SIZE256
#defineWELCOME_MESSAGE"welcometoconnecttheserver."
staticstructtermiosg_newtio,g_oldtio;
staticintspeed_arr[]=
{
B115200,B57600,B38400,B19200,B9600,B4800,B2400,B1200,B300,
B115200,B57600,B38400,B19200,B9600,B4800,B2400,B1200,B300,
};
staticintname_arr[]=
{
115200,57600,38400,19200,9600,4800,2400,1200,300,
115200,57600,38400,19200,9600,4800,2400,1200,300,
};
intInit_COM(intComm,intBaudrate,intParity,intStopbit,intFlagblock)
{
intret,i;
chardev_buf[16];
if(Comm>3)
{
printf("Com%dnotexist\n",Comm);
return-1;
}
memset(dev_buf,0x00,sizeof(dev_buf));
sprintf(dev_buf,"/dev/ttyS%d",Comm);
if(Flagblock)
{
ret=open(dev_buf,O_RDWR|O_NOCTTY);//以默认阻塞方式打开
}
else
{
ret=open(dev_buf,O_RDWR|O_NOCTTY|O_NONBLOCK);//以非阻塞方式打开
}
if(ret<0)
{
printf("OpenttyS%dfailed\n",Comm);
return-1;
}
if(tcgetattr(ret,&g_oldtio)<0)//保存原先的端口
{
printf("GetComParameterError.\n");
return-1;
}
for(i=0;i { if(Baudrate==name_arr[i]) { cfsetispeed(&g_newtio,speed_arr[i]);/*设置输入输出波特率*/ cfsetospeed(&g_newtio,speed_arr[i]); break; } } if(i>=sizeof(speed_arr)/sizeof(int)) { printf("UnsupportedSpeed! \n"); return-1; } switch(Parity) { case'n': case'N': g_newtio.c_cflag&=~PARODD; g_newtio.c_cflag&=~PARENB; break; case'o': case'O': g_newtio.c_cflag|=PARENB; g_newtio.c_cflag|=PARODD;//奇校验 break; case'e': case'E': g_newtio.c_cflag|=PARENB;//偶校验 g_newtio.c_cflag&=~PARODD; break; default: printf("UnsupportedParity\n"); return-1; } switch(Stopbit)//设置停止校验位是为2,否为1. { case1: g_newtio.c_cflag&=~CSTOPB; break; case2: g_newtio.c_cflag|=CSTOPB; break; default: printf("UnsupportedStopbit! \n"); return-1; } g_newtio.c_iflag=0; g_newtio.c_oflag=0; g_newtio.c_lflag=0; g_newtio.c_cc[VTIME]=1;//最大等待时间为1*100ms g_newtio.c_cc[VMIN]=1;//最小读数为1 g_newtio.c_iflag&=~INPCK; g_newtio.c_cflag&=~CRTSCTS; g_newtio.c_cflag&=~CSIZE;//设置数据位 g_newtio.c_cflag|=CS8;// g_newtio.c_cflag|=CLOCAL; g_newtio.c_cflag|=CREAD; if(tcsetattr(ret,TCSANOW,&g_newtio)! =0)//激活设置 { printf("SetComParameterError! \n"); return-1; } tcflush(ret,TCIOFLUSH);//刷新输入输出缓存 returnret; } //以上为套接字的相关定义 //一下类似与client一样设置数据接收和发送。 voidRestoreComConfiguration(intfd,structtermios*ptios) { if(tcsetattr(fd,TCSANOW,ptios)! =0) { printf("RestoreComParameterError! \n"); } } intfd;charbuf[1024],buf2[1024]; intservfd,clifd; structsockaddr_inservaddr,cliaddr; intrunflag=0; void*Thread1(void*arg) { printf("PleaseinputyourwordstoServer: --$tostop\n"); while(runflag){ memset(buf,0,BUFFER_SIZE); read(fd,buf,1024); send(clifd,buf,strlen(buf),0); if(strstr(buf,"$")>0){runflag=0;printf("stop! \n");break;} } } void*Thread2(void*arg) { intlength=0; while(runflag){char stdstr[1024]="fromclient: "; memset(buf2,0,BUFFER_SIZE); length=recv(clifd,buf2,1024,0); if(length>0) { strcat(stdstr,buf2);strcat(stdstr,"\n"); if(strstr(buf2,"$")>0) {runflag=0;printf("stop! \n");break;} write(fd,stdstr,strlen(stdstr)); } } } voidsocket_init(void) { if((servfd=socket(AF_INET,SOCK_STREAM,0))<0) {printf("createsocketerror! \n"); exit (1); } bzero(&servaddr,sizeof(servaddr)); servaddr.sin_family=AF_INET; servaddr.sin_port=htons(SERVER_PORT); servaddr.sin_addr.s_addr=htons(INADDR_ANY); if(bind(servfd,(structsockaddr*)&servaddr,sizeof(servaddr))<0) {printf("bindtoport%dfailure! \n",SERVER_PORT); exit (1); } if(listen(servfd,QUEUE)<0) {printf("calllistenfailure! \n"); exit (1); } socklen_tlength=sizeof(cliaddr); clifd=accept(servfd,(structsockaddr*)&cliaddr,&length); if(clifd<0){printf("errorcomeswhencallaccept! \n"); exit (1);} } intmain(intargc,char*argv[]) { fd=Init_COM(COM0,115200,'N',1,BLOCK_MODE); socket_init(); pthread_ttidp,tidp2; intpth; if(fd>=0)RestoreComConfiguration(fd,&g_oldtio); runflag=1; pth=pthread_create(&tidp,NULL,Thread1,NULL); if(pth! =0){printf("error! ");return-1;} pth=pthread_create(&tidp2,NULL,Thread2,NULL); if(pth! =0){printf("error! ");return-1;} pthread_detach(tidp); pthread_detach(tidp2); while(runflag){;} close(clifd);close(fd);close(servfd);//全部关闭 return0; } 编译结果: 5、nfs挂载 4、实验结果: 5、心得体会:
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