串口应用程序

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#include <termios.h>struct termios{    tcflag_t c_iflag;      /* input modes */    tcflag_t c_oflag;      /* output modes */    tcflag_t c_cflag;      /* control modes */    tcflag_t c_lflag;      /* local modes */    cc_t     c_cc[NCCS];   /* special characters */}

int tcgetattr(int fd, struct termios *termios_p); //获取与终端相关的参数inttcsetattr(int fd, int optional_actions, struct termios *termios_p); //设置终端参数int tcsendbreak(int fd, int duration);int tcdrain(int fd); //等待直到所有写入 fd 引用的对象的输出都被传输int tcflush(int fd, int queue_selector); //刷清(扔掉)输入缓存int tcflow(int fd, int action); //挂起传输或接受int cfmakeraw(struct termios *termios_p);// 制作新的终端控制属性speed_t cfgetispeed(struct termios *termios_p); //得到输入速度speed_t cfgetospeed(struct termios *termios_p); //得到输出速度int cfsetispeed(struct termios *termios_p, speed_t speed); //设置输入速度int cfsetospeed(struct termios *termios_p, speed_t speed) //设置输出速度

send.c

#include <fcntl.h>#include <unistd.h>#include <termios.h>int main(){    char sbuf[] = {"Hello, this is a serial port test!\n"};    struct termios option;    ///dev/pts/?是两个虚拟串口之一    int fd = open("/dev/pts/25", O_RDWR | O_NOCTTY | O_NONBLOCK);    if(fd == -1)     {               perror("Open serial port error!\n");            return -1;     }       printf("Open serial port success!\n");    tcgetattr(fd, &option);    cfmakeraw(&option);    cfsetispeed(&option, B9600);    cfsetospeed(&option, B9600);    tcsetattr(fd, TCSANOW, &option);    int length = sizeof(sbuf);    int ret = write(fd, sbuf, length);    if(ret == -1)     {               perror("Write data error!\n");            return -1;     }       printf("The number of char sent is %d\n", ret);    ret = close(fd);    if(ret == -1)        perror("Close the device failure!\n");    return 0;}

recv.c

#include <stdio.h>#include <string.h>#include <malloc.h>#include <sys/types.h>#include <sys/stat.h>#include <fcntl.h>#include <unistd.h>#include <termios.h>#include <math.h>#define MAX_BUFFER_SIZE 512int main(){    char hd[MAX_BUFFER_SIZE], *rbuf;    int ret;    struct termios opt;    ///dev/pts/?是两个虚拟串口之一    int fd = open("/dev/pts/28", O_RDWR|O_NOCTTY|O_NDELAY);    if(fd == -1)     {           perror("Open serial port error!\n");        return -1;     }       printf("Open serial port success!\n");    tcgetattr(fd, &opt);    cfmakeraw(&opt);    cfsetispeed(&opt, B9600);    cfsetospeed(&opt, B9600);    tcsetattr(fd, TCSANOW, &opt);    rbuf = hd;     printf("Ready for receiving data...\n");    while(1)    {        while((ret = read(fd, rbuf, 1)) > 0)                printf("%c", *rbuf);    }    printf("\n");    ret = close(fd);    if(ret == -1)        perror("Close the device failure!\n");    return 0;}

虚拟串口：http://blog.csdn.net/zhangxuechao_/article/details/70670405

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