【RT1052】+ 06 ucLinux之TCP控制LED

keke737011 · 发表于 2018-11-21 18:23:11

【飞凌RT1052】+ 06 ucLinux之TCP控制LED

1. 目的

新建一个TCP服务器，服务器端实现对板载LED的控制。采用电脑客户端连接上服务器，发送0或者1来控制LED亮与灭。

2. 测试准备工作

服务端源码如下：

#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <netinet/in.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <fcntl.h>
#define PORT 5000
#define BACKLOG 10
#define LENGTH 512
int main()
{
int iR;
int sockfd;
int nsockfd;
int num;
int sin_size;
int value;
int pfd;
struct sockaddr_in addr_local;
struct sockaddr_in addr_remote;
/*获取文件描述符*/
if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1)
{
printf("ERROR:Failed to obtain socket Descriptor.\n");
return 0;
}
else
{
printf("OK:Obtain socket descriptor successfully.\n");
}
/*本地地址初始化*/
addr_local.sin_family=AF_INET;
addr_local.sin_port=htons(PORT);
addr_local.sin_addr.s_addr=htonl(INADDR_ANY);
memset(addr_local.sin_zero,0,8);
/*绑定端口*/
if(bind(sockfd,(struct sockaddr*)&addr_local,sizeof(struct sockaddr))==-1)
{
printf("ERROR:Failed to bind Port %d.\n",PORT);
return 0;
}
else
{
printf("OK:Bind the Port %d successfully.\n",PORT);
}
/*监听端口*/
if(listen(sockfd,BACKLOG)==-1)
{
printf("ERROR:Failed to listen Port %d.\n",PORT);
return 0;
}
else
{
printf("OK:Listening the Port %d successfully.\n",PORT);
}
/*一直等待连接*/
sin_size=sizeof(struct sockaddr_in);
nsockfd=accept(sockfd,(struct sockaddr*)&addr_remote,&sin_size);
if(nsockfd==-1)
{
printf("ERROR:Obtain new socket Descriptor error.\n");
return 0;
}
else
{
printf("OK:Server has got connected from %s.\n",inet_ntoa(addr_remote.sin_addr));
}
pfd=open("/sys/devices/platform/leds/leds/led1/brightness",O_RDWR); //打开LED驱动
if(pfd<0)
{
printf("Open led failed.\n");
return -1;
}
write(pfd,"1",1);
while(1)
{
read(nsockfd,&value,4); //int 型
if(value==1)
{
write(pfd,"1",1);
}
else
{
if(value==0)
{
write(pfd,"0",1);
}
else
{
printf("client quiting...\n");
break;
}
}
}
close(pfd);
close(nsockfd);
close(sockfd);
}