socket编程之socket转串口

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系统环境：Centos 6.5

开发板：s3c2440

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1、程序功能

该程序是一个运行在开发板上的client程序，连接到windows下usr-tcp调试工具模拟的server，接受串口和socket数据并转发

usr-tcp通过tcp服务器向client发送数据，client接受到数据后通过串口发回usr-tcp

usr-tcp通过串口向client发送数据，client接收到数据后通过socket发回usr-tcp

2、源代码

串口相关设置 serial.c

/********************************************************************************* *      Copyright:  (C) 2016 Lu Zengmeng<1540999272@qq.com> *                  All rights reserved. * *       Filename:  serial.c *    Description:  This file  *                  *        Version:  1.0.0(08/01/2016) *         Author:  Lu Zengmeng <1540999272@qq.com> *      ChangeLog:  1, Release initial version on "08/01/2016 06:44:59 PM" *                  ********************************************************************************/#include <stdio.h>#include <termios.h>#include <fcntl.h>#include <string.h>#define FAIL -1#define OK   0 int speed_arr[] = {B115200,B57600,B38400,B19200,B9600,B4800,B2400,B1200,B600,B300,B110};int name_arr[]  = { 115200, 57600, 38400, 19200, 9600, 4800, 2400, 1200, 600, 300, 110};/* set baud rate */void set_speed(int fd, int speed){    int i;    int status;    struct termios options;    tcgetattr(fd, &options);    options.c_iflag &= ~ (INLCR | ICRNL | IGNCR);    options.c_oflag &= ~(ONLCR | OCRNL);    options.c_iflag &= ~(IXON);    for( i= 0; i < sizeof(speed_arr) / sizeof(int); i++)    {        if(speed == name_arr[i])        {            tcflush(fd, TCIOFLUSH);/*empty input cache*/            cfsetispeed(&options, speed_arr[i]);            cfsetospeed(&options, speed_arr[i]);            status = tcsetattr(fd, TCSANOW, &options);            if(status != 0)                   perror("tcsetattr fd");            return;        }        tcflush(fd,TCIOFLUSH);/*empty input cache*/    }}/** * *@brief 设置串口数据位，停止位和效验位 * *@param fd 类型 int 打开的串口文件描述符 * *@param databits 类型 int 数据位 取值 为 7 或者8 * *@param stopbits 类型 int 停止位 取值为 1 或者2 * *@param parity 类型 int 效验类型 取值为N,E,O,S * */int set_parity(int fd,int databits,int stopbits,int parity){    struct termios options;    if ( tcgetattr( fd,&options) != 0)    {        perror("SetupSerial 1");        return(FAIL);    }    options.c_cflag &= ~CSIZE;    options.c_lflag  &= ~(ICANON | ECHO | ECHOE | ISIG);  /*Input*/    options.c_oflag  &= ~OPOST;   /*Output*/    switch (databits) /*set datebits*/    {        case 7:            options.c_cflag |= CS7;            break;        case 8:            options.c_cflag |= CS8;            break;        default:            fprintf(stderr,"Unsupported data size\n");            return (FAIL);    }    switch (parity)    {        case 'n':        case 'N':            options.c_cflag &= ~PARENB; /* Clear parity enable */            options.c_iflag &= ~INPCK; /* Enable parity checking */            break;        case 'o':        case 'O':            options.c_cflag |= (PARODD | PARENB); /* 设置为奇效验*/            options.c_iflag |= INPCK; /* Disnable parity checking */            break;        case 'e':        case 'E':            options.c_cflag |= PARENB; /* Enable parity */            options.c_cflag &= ~PARODD; /* 转换为偶效验*/            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 (FAIL);    }    /*set stopbits */    switch (stopbits)    {        case 1:            options.c_cflag &= ~CSTOPB;            break;        case 2:            options.c_cflag |= CSTOPB;            break;        default:            fprintf(stderr,"Unsupported stop bits\n");            return (FAIL);    }    /* Set input parity options */    if (parity != 'n')        options.c_iflag |= INPCK;    options.c_cc[VTIME] = 0; // 15 seconds    options.c_cc[VMIN] = 0;    tcflush(fd,TCIFLUSH); /* Update the optionsions and do it NOW */    if (tcsetattr(fd,TCSANOW,&options) != 0)    {        perror("tcsetattr");        return FAIL;    }    return (OK);}/** * *@breif open device * */int open_dev(char *dev){    int fd;    fd = open( dev, O_RDWR|O_NOCTTY|O_NDELAY);    if (fd < 0)    {        perror("open");        return FAIL;    }    else        return fd;}

serial.h

/******************************************************************************** *      Copyright:  (C) 2016 Lu Zengmeng<1540999272@qq.com> *                  All rights reserved. * *       Filename:  serial.h *    Description:  This head file  * *        Version:  1.0.0(08/01/2016) *         Author:  Lu Zengmeng <1540999272@qq.com> *      ChangeLog:  1, Release initial version on "08/01/2016 06:44:25 PM" *                  ********************************************************************************/#include <stdio.h>#ifndef __SERIAL_H__#define __SERIAL_H__extern int speed_arr[];extern int name_arr[];extern void set_speed(int fd, int speed);extern int set_parity(int fd,int databits,int stopbits,int parity);extern int open_dev(char *dev);#endif

socket初始化连接 tcp.c

/********************************************************************************* *      Copyright:  (C) 2016 Lu Zengmeng<1540999272@qq.com> *                  All rights reserved. * *       Filename:  tcp.c *    Description:  This file  *                  *        Version:  1.0.0(08/02/2016) *         Author:  Lu Zengmeng <1540999272@qq.com> *      ChangeLog:  1, Release initial version on "08/02/2016 08:09:55 AM" *                  ********************************************************************************/#include <stdio.h>#include <sys/types.h>#include <sys/socket.h>#include <arpa/inet.h>#include <netinet/in.h>#include <strings.h>#include <stdlib.h>#include <unistd.h>#include <string.h>#include <fcntl.h>#include <sys/stat.h>#include "tcp.h"/************************************************************************************** *  Description: *   Input Args: *  Output Args: * Return Value: *************************************************************************************/int socket_init(void){    int                    fd;    struct sockaddr_in     serv_addr;    bzero(&serv_addr,sizeof(serv_addr));    serv_addr.sin_family = AF_INET;    serv_addr.sin_port   = htons(PORT);    if ((inet_pton(AF_INET,IPADDR,&serv_addr.sin_addr)) < 0)    {        perror("inet_pton");        exit(1);    }    fd = socket(AF_INET, SOCK_STREAM, 0);    if (fd < 0)    {        perror("socket");        exit(1);    }    if (-1 == connect(fd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)))    {        perror("connect");        exit(1);    }    printf("connect sucesseful\n");    return fd;}     /* ----- End of socket_init()  ----- */

tcp.h

/******************************************************************************** *      Copyright:  (C) 2016 Lu Zengmeng<1540999272@qq.com> *                  All rights reserved. * *       Filename:  tcp.h *    Description:  This head file  * *        Version:  1.0.0(08/02/2016) *         Author:  Lu Zengmeng <1540999272@qq.com> *      ChangeLog:  1, Release initial version on "08/02/2016 08:22:06 AM" *                  ********************************************************************************/#include <stdio.h>#ifndef __TCP_H_#define __TCP_H_#define PORT             8003#define IPADDR           "192.168.1.104"extern int socket_init(void);#endif

main.c

/********************************************************************************* *      Copyright:  (C) 2016 Lu Zengmeng<1540999272@qq.com> *                  All rights reserved. * *       Filename:  main.c *    Description:  This file  *                  *        Version:  1.0.0(08/01/2016) *         Author:  Lu Zengmeng <1540999272@qq.com> *      ChangeLog:  1, Release initial version on "08/01/2016 06:45:37 PM" *                  ********************************************************************************/#include <stdio.h>#include <stdlib.h>  #include <string.h>  #include <errno.h> #include <unistd.h>  #include <sys/types.h>  #include <sys/stat.h>  #include <fcntl.h>   #include <termios.h> #include <pthread.h> #include "serial.h" #include "tcp.h" #define  DEVICE      "/dev/ttyS1"#define  BUF_SIZE    128int    usrt_fd;int    sock_fd;void usrt_to_socket (void);void socket_to_usrt (void);/* start main */int main(int argc,char **argv){    int    ret;    char   *dev = DEVICE;    pthread_t sock,usrt;    sock_fd = socket_init();    usrt_fd = open_dev(dev);    set_parity(usrt_fd,8,1,'N'); // 设置串口数据位、停止位、校验位    set_speed(usrt_fd,9600); // 设置串口波特率    ret = pthread_create(&sock,NULL,(void *)socket_to_usrt,NULL); // 创建sock线程接收socket数据    if(ret < 0)    {        perror("phread_create");        exit(1);    }    ret = pthread_create(&usrt,NULL,(void *)usrt_to_socket,NULL); // 创建usrt线程接收串口数据    if(ret < 0)    {        perror("phread_create");        exit(1);    }    pthread_join(sock,NULL); // 等待线程退出    pthread_join(usrt,NULL);    close(sock_fd);    close(usrt_fd);    printf("main exit...\n");    return 0;}/************************************************************************************** *  Description:接收socket数据并通过串口转发 *   Input Args: *  Output Args: * Return Value: *************************************************************************************/void socket_to_usrt (void){    printf("start socket_to_usrt...\n");    int     n = 0;    int     m = 0;    char    buf[BUF_SIZE];    while(1)    {        memset(buf,0,BUF_SIZE);        n = read(sock_fd,buf,BUF_SIZE);        if(n>0)        {            if(0==strncmp(buf,"exit",4)) // 收到exit时，线程退出            {                m = write(usrt_fd,buf,BUF_SIZE);                if(m<0)                {                    perror("write to usrt");                }                break;            }            m = write(usrt_fd,buf,BUF_SIZE);            if(m<0)            {                perror("write to usrt");            }        }        else if(n<0)        {            perror("read from socket");        }    }    printf("socket_to_usrt exit...\n");    pthread_exit(0);} /* ----- End of sock_to_usrt()  ----- *//************************************************************************************** *  Description:接收串口数据并通过socket转发 *   Input Args: *  Output Args: * Return Value: *************************************************************************************/void usrt_to_socket (void){    printf("start usrt_to_socket...\n");    int     n = 0;    int     m = 0;    char    buf[BUF_SIZE];    while(1)    {        memset(buf,0,BUF_SIZE);        n = read(usrt_fd,buf,BUF_SIZE);        if(n>0)        {            if(0==strncmp(buf,"exit",4)) // 收到exit时，线程退出            {                m = write(sock_fd,buf,BUF_SIZE);                if(m<0)                {                    perror("write to sock");                }                break;            }            m = write(sock_fd,buf,BUF_SIZE);            if(m<0)            {                perror("write to sock");            }        }        else if(n<0)        {            perror("read from usrt");        }    }        printf("usrt_to_socket exit...\n");    pthread_exit(0);} /* ----- End of usrt_to_sock()  ----- */

makefile

NAME=clientCC=/opt/buildroot-2012.08/arm920t/usr/bin/arm-linux-gccEXTRA_CFLAGS+= -Wall -WerrorEXTRA_CFLAGS+= -lpthreadall:        $(CC) $(EXTRA_CFLAGS) main.c serial.c tcp.c -o $(NAME)        cp $(NAME) /tftp

3、调试助手下载

USR-TCP232-Test

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