Linux下串口终端通信基础编程及简单的GPS设备数据读取

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我是靠谱客的博主奋斗酸奶，最近开发中收集的这篇文章主要介绍Linux下串口终端通信基础编程及简单的GPS设备数据读取，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

头文件：
termios.h

结构体：
//终端属性结构体   :起始位/停止位/数据位/校验位/硬件流控
struct termios {
          tcflag_t c_iflag;               /* input mode flags */
          tcflag_t c_oflag;               /* output mode flags */
          tcflag_t c_cflag;               /* control mode flags */
          tcflag_t c_lflag;               /* local mode flags */
          cc_t c_line;                    /* line discipline */
          cc_t c_cc[NCCS];                /* control characters */
     };

获得和设置终端属性函数：
/* Put the state of FD into *TERMIOS_P. */

extern int tcgetattr (int __fd, struct termios *__termios_p) ; //从内核中获取termios 结构体

/* Set the state of FD to *TERMIOS_P.
Values for OPTIONAL_ACTIONS (TCSA*) are in <bits/termios.h>. */
extern int tcsetattr (int __fd, int __optional_actions, __const struct termios *__termios_p) ; //设置终端属性

波特率获取设置函数：

/* Return the output baud rate stored in *TERMIOS_P. */
extern speed_t cfgetospeed (__const struct termios *__termios_p) ;

/* Return the input baud rate stored in *TERMIOS_P. */
extern speed_t cfgetispeed (__const struct termios *__termios_p) ;

/* Set the output baud rate stored in *TERMIOS_P to SPEED. */
extern int cfsetospeed (struct termios *__termios_p, speed_t __speed);

/* Set the input baud rate stored in *TERMIOS_P to SPEED. */
extern int cfsetispeed (struct termios *__termios_p, speed_t __speed);

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GPS 设备读取,未解码

#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <termios.h>

int main(void)
{
int fd;

fd = open("/dev/ttyUSB0", O_RDWR|O_NOCTTY);    //打开GPS设备文件
if (fd < 0)
{
  perror("open");
  return 1;
}

///
struct termios opts;
tcgetattr(fd, &opts);

cfsetispeed(&opts, B38400); //设置波特率
cfsetospeed(&opts, B38400);

//8N1
opts.c_cflag |= CLOCAL|CREAD;
opts.c_cflag &= ~PARENB;
opts.c_cflag &= ~CSTOPB;
opts.c_cflag &= ~CSIZE;
opts.c_cflag |= CS8;

//硬件流控

opts.c_cflag &= CRTSCTS;

tcsetattr(fd, TCSANOW, &opts);
tcflush(fd, TCIOFLUSH);

char ch;
while (1)       //循环读取
{
  read(fd, &ch, 1);
  putchar(ch);

}
return 0;
}