在Linux 环境如何进行串口通信？

只看该作者 · 2018-9-1 09:08

#include<stdio.h>

#include<stdlib.h>

#include<string.h>

#include<sys/types.h>

#include<sys/stat.h>

#include<fcntl.h>

#include<unistd.h>

#include<termios.h>

#include<string.h>

int set_opt(int fd,int nSpeed, int nBits, char nEvent, int nStop)

{

      struct termios newtio,oldtio;

      if  ( tcgetattr( fd,&oldtio)  !=  0) {

            perror(&quot;SetupSerial 1&quot;);

            return -1;

      }

      bzero( &newtio, sizeof( newtio ) );

      newtio.c_cflag  |=  CLOCAL | CREAD;

      newtio.c_cflag &= ~CSIZE;

      switch( nBits )

      {

      case 7:

            newtio.c_cflag |= CS7;

            break;

      case 8:

            newtio.c_cflag |= CS8;

            break;

      }

      switch( nEvent )

      {

      case 'O':

            newtio.c_cflag |= PARENB;

            newtio.c_cflag |= PARODD;

            newtio.c_iflag |= (INPCK | ISTRIP);

            break;

      case 'E':

            newtio.c_iflag |= (INPCK | ISTRIP);

            newtio.c_cflag |= PARENB;

            newtio.c_cflag &= ~PARODD;

            break;

      case 'N':

            newtio.c_cflag &= ~PARENB;

            break;

      }

      switch( nSpeed )

      {

      case 2400:

            cfsetispeed(&newtio, B2400);

            cfsetospeed(&newtio, B2400);

            break;

      case 4800:

            cfsetispeed(&newtio, B4800);

            cfsetospeed(&newtio, B4800);

            break;

      case 9600:

            cfsetispeed(&newtio, B9600);

            cfsetospeed(&newtio, B9600);

            break;

      case 115200:

            cfsetispeed(&newtio, B115200);

            cfsetospeed(&newtio, B115200);

            break;

      case 460800:

            cfsetispeed(&newtio, B460800);

            cfsetospeed(&newtio, B460800);

            break;

      default:

            cfsetispeed(&newtio, B9600);

            cfsetospeed(&newtio, B9600);

            break;

      }

      if( nStop == 1 )

            newtio.c_cflag &=  ~CSTOPB;

      else if ( nStop == 2 )

      newtio.c_cflag |=  CSTOPB;

      newtio.c_cc[VTIME]  = 0;

      newtio.c_cc[VMIN] = 0;

      tcflush(fd,TCIFLUSH);

      if((tcsetattr(fd,TCSANOW,&newtio))!=0)

      {

            perror(&quot;com set error&quot;);

            return -1;

      }

//       printf(&quot;set done!\n\r&quot;);

      return 0;

}

int main(void)

{

      int fd1,fd2,nset1,nset2,nread;

      char buf[100];

      char buf1[1];

      char *buff = &quot;Hello\n\r&quot;;

      fd1 = open( &quot;/dev/ttySAC0&quot;, O_RDWR);

      if (fd1 == -1)

            exit(1);

      fd2 = open( &quot;/dev/ttySAC1&quot;, O_RDWR);

      if (fd2 == -1)

            exit(1);

      nset1 = set_opt(fd1, 115200, 8, 'N', 1);

      if (nset2 == -1)

            exit(1);

      nset2 = set_opt(fd2, 4800, 8, 'N', 1);

      if (nset2 == -1)

            exit(1);

//       write(fd1, 'f', 1);

      while       (1)

      {

            nread = read(fd2, buf, 1);

            if (nread > 0)

                     write(fd1, buf, 1);



            nread = read(fd1, buf1,1);

            if(buf1[0] == 'q')

                     break;

      }

      close(fd1);

      close(fd2);

      return 0;

}

在Linux 环境如何进行串口通信？

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