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#include <stdio.h> #include <string.h> #include <sys/types.h> #include <errno.h> #include <sys/stat.h> #include <fcntl.h> #include <unistd.h> #include <termios.h> #include <stdlib.h> /*配置串口函数*/ int set_opt(int fd ,int nSpeed, int nBits , char nEvent, int nStop) { struct termios newtio,oldtio; if (tcgetattr ( fd ,& oldtio) != 0) { perror ("SetupSerial 1"); 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; 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 ("com set error"); return -1; } printf("set done!\n"); return 0 ; } int open_port( int fd,int comport) { char *dev[]={ "/dev/ttyS0","/dev/ttyS1","/dev/ttyS2" }; long vdisable; if (comport==1) { fd = open ( "/dev/ttyS0", O_RDWR|O_NOCTTY|O_NDELAY); if (-1 == fd ) { perror ("Can't Open Serial Port"); return(-1); } else printf("open ttyS0 .....\n" ); } else if (comport==2) { fd = open ( "/dev/ttyS1", O_RDWR|O_NOCTTY|O_NDELAY); if (-1 == fd ) { perror ("Can't Open Serial Port"); return(-1); } else printf("open ttyS1 .....\n" ); } else if ( comport==3) { fd = open( "/dev/ttyS2", O_RDWR|O_NOCTTY|O_NDELAY); if (-1 == fd ) { perror ("Can't Open Serial Port"); return(-1); } else printf("open ttyS2 .....\n" ); } if (fcntl(fd , F_SETFL, 0)<0) printf("fcntl failed!\n" ); else printf("fcntl=%d\n", fcntl(fd , F_SETFL,0)); if (is a tty (STDIN_FILENO)==0) printf("standard input is not a terminal device\n"); else printf("is a tty success!\n"); printf("fd-open=%d\n", fd); return (fd) ; } int main(void) { int fd ; int nread, i ; char buff[]="Hello\n"; if ((fd=open_port(fd ,1))< 0){ perror ("open_port error"); return 0; } if ((i =set_opt(fd ,115200,8 ,'N',1))< 0){ perror ("set_opt error"); return; } printf("fd=%d\n" ,fd ); nread=read(fd ,buff,8); printf("nread=%d,%s\n" ,nread,buff); close(fd); return 0; }