linux系统下,串口接收发送数据,并利用udp转发

//************该程序实现的UDP数据和串口数据的转化**********************///时间：2013/7/30//作者：田子#include<stdlib.h>#include<stdio.h>#include<errno.h>#include<string.h>#include<netdb.h>#include<sys/types.h>#include<netinet/in.h>#include<sys/socket.h>#include<arpa/inet.h>#include<unistd.h>#include<sys/stat.h>#include<fcntl.h>#include<termios.h>#include<sys/wait.h>#define PORT 61557 //远端主机端口号#define BROADCASTPORT 8003 //本地端口号#define BUF_SIZE 100 //定义UDP数据发送的长度#define FALSE -1#define TRUE 0/***@bref 设置串口通信速率*@param fd 类型 int 打开串口文件的句柄*@param speed 类型 int 串口速度*@return void*/int speed_arr[] = {B115200, B38400, B19200, B9600, B4800, B2400, B1200, B300,B38400, B19200, B9600, B4800, B2400, B1200, B300, };int name_arr[] = {115200,38400, 19200, 9600, 4800, 2400, 1200, 300, 38400, 19200, 9600, 4800, 2400, 1200, 300, };void set_speed(int fd, int speed){int i;int status;struct termios Opt;tcgetattr(fd, &Opt);for ( i= 0; i < sizeof(speed_arr) / sizeof(int); i++) {if (speed == name_arr[i]) {tcflush(fd, TCIOFLUSH);cfsetispeed(&Opt, speed_arr[i]);cfsetospeed(&Opt, speed_arr[i]);status = tcsetattr(fd, TCSANOW, &Opt);if (status != 0) {perror("tcsetattr fd");return;}tcflush(fd,TCIOFLUSH);}}}/***@bref 设置串口数据位，停止位和校验位*@param fd 类型 int 打开串口文件的句柄*@param databits 类型 int 数据位取值为7或8*@param stopbits 类型 int 停止位取值为1或2*@param parity 类型 int 校验位取值为N，E，O，S*@return void*/int set_Parity(int fd,int databits,int stopbits,int parity) {struct termios options;if ( tcgetattr( fd,&options) != 0) {perror("SetupSerial 1");return(FALSE);}options.c_cflag &= ~CSIZE;options.c_iflag &= ~INPCK;options.c_iflag |= IGNBRK;options.c_iflag &= ~ICRNL;options.c_iflag &= ~IXON;options.c_lflag &= ~IEXTEN;options.c_lflag &= ~ECHOK;options.c_lflag &= ~ECHOCTL;options.c_lflag &= ~ECHOKE;options.c_oflag &= ~ONLCR;switch (databits) /*ÉèÖÃÊýŸÝλÊý*/{case 7:options.c_cflag |= CS7;break;case 8:options.c_cflag |= CS8;break;default:// fprintf(stderr,"Unsupported data size\n");return (FALSE);}switch (parity){case 'n':case 'N'://options.c_cflag &= ~PARENB; /* Clear parity enable *///options.c_iflag &= ~INPCK; /* Enable parity checking */options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);options.c_oflag &= ~OPOST; /*Output*/break;case 'o':case 'O':options.c_cflag |= (PARODD | PARENB); /* ÉèÖÃΪÆæЧÑé*/options.c_iflag |= INPCK; /* Disnable parity checking */break;case 'e':case 'E':options.c_cflag |= PARENB; /* Enable parity */options.c_cflag &= ~PARODD; /* ת»»ÎªÅŒÐ§Ñé*/options.c_iflag |= INPCK; /* Disnable parity checking */break;case 'S':case 's': /*as no parity*/options.c_cflag &= ~PARENB;options.c_cflag &= ~CSTOPB;break;default:// fprintf(stderr,"Unsupported parity\n");return (FALSE);}/* ÉèÖÃֹͣλ*/switch (stopbits){case 1:options.c_cflag &= ~CSTOPB;break;case 2:options.c_cflag |= CSTOPB;break;default:// fprintf(stderr,"Unsupported stop bits\n");return (FALSE);}/* Set input parity option */if ((parity != 'n')&&(parity != 'N'))options.c_iflag |= INPCK;tcflush(fd,TCIFLUSH);options.c_cc[VTIME] = 150; /* ÉèÖó¬Ê±15 s econds*/options.c_cc[VMIN] = 0; /* Update the options and do it NOW */if (tcsetattr(fd,TCSANOW,&options) != 0){// perror("SetupSerial 3");return (FALSE);}return (TRUE);}/***@bref 打开串口*@param Dev 类型 char 串口号*@return int 返回串口的句柄*/int OpenDev(char *Dev){int fd = open( Dev, O_RDWR|O_NOCTTY|O_NONBLOCK ); //以读写方式打开串口，IO操作为非阻塞模式if (-1 == fd){// perror("Can't Open Serial Port");return -1; //若打开失败，返回-1}elsereturn fd;}/***@bref 从外界接收UDP包*@param change 类型 unsigned char 储存UDP接收进来的数据*@return 返回接收到数据的长度*/int udp_broadcast_service(unsigned char *change){int castsockfd, connfd;int optval;int client_len;int revc;struct sockaddr_in serv_addr, client_addr;if ( (castsockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0 ) //创建套接字socket{// perror("sockfd error!\n");exit(1);}//******配置本地信息，包括端口号，IP，和协议族（一般为AF_NET,表示UNIX网络套接字） memset( &serv_addr, 0, sizeof(struct sockaddr_in) ); //把serv_addr的所有字节设置成字符serv_addr.sin_family = AF_INET; //表示UNIX网络套接字serv_addr.sin_port = htons( BROADCASTPORT ); //设置本地端口号 htons()表示把16位从主机字节序转换成网络字节序serv_addr.sin_addr.s_addr = htons( INADDR_ANY ); //INADDR_ANY使用自己的IP 地址fcntl(castsockfd,F_SETFL,O_NONBLOCK);if ( bind(castsockfd, (struct sockaddr *)&serv_addr, //调用bind函数将本地信息与socket相关连sizeof(struct sockaddr)) < 0 ){// perror("bind failed!\n");exit(1);}client_len = sizeof( struct sockaddr_in );while((revc=recvfrom(castsockfd, change, BUF_SIZE, 0, //接收UDP 数据包(struct sockaddr *)&client_addr,&client_len))<=0){if(getppid()==1) //父进程死亡，子进程退出exit(1);}close( castsockfd ); //关闭套接字return revc; //返回数据长度}/***@bref 从向外发送UDP广播包*@param send_buf 类型 unsigned short int 储存UDP要发送的数据*@param t 类型 int 数据包的长度*@return 返回接收到数据的长度*/int send_broadcast(unsigned char *send_buf,int t){int client_sockfd;int optval;struct sockaddr_in serv_addr;if ( (client_sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0 ) //创建套接字socket{// perror("sockfd error!\n");exit(1);}optval = 1;//**********当一个套接字已经打开但尚未有连接的时候用setsockopt()系统调用在其上设定选项if ( setsockopt(client_sockfd, SOL_SOCKET, SO_BROADCAST,(void *)&optval, sizeof(int)) < 0 ){// perror("setsockopt error!\n");exit(1);}memset( &serv_addr, 0, sizeof(struct sockaddr_in) ); //把serv_addr 的所有字节设置成字符serv_addr.sin_family = AF_INET; //表示UNIX网络套接字serv_addr.sin_port = htons( PORT ); //远端主机端口号 serv_addr.sin_addr.s_addr = inet_addr("192.168.1.255"); //表示发送的是广播包if ( sendto(client_sockfd, send_buf, t, 0,(struct sockaddr *)&serv_addr,sizeof(struct sockaddr)) < 0 )//广播包每次发一个字节{// perror("send failed!\n");exit(1);}close( client_sockfd ); //关闭套接字return 0;}int main(){pid_t pid,id;int fd;int nread,nwrite;int i=0,sum=0,recv_c=0;unsigned char readbuff[100]; //定义串口在内存中接收的缓冲区unsigned char buff[100]; //将缓冲接收的串口数据放到buff里unsigned char check[100]; //存放udp接收的数据char *dev = "/dev/ttyS0";fd = OpenDev(dev); //打开串口set_speed(fd,57600); //设置波特率为57600if (set_Parity(fd,8,1,'N') == FALSE) //设置校验，数据位，停止位 {exit (1);}pid=fork(); //建立新的进程。