linux 串口发送

#include<stdio.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<fcntl.h>
#include<termios.h>
#defineBAUDRATEB115200
#defineMODEMDEVICE"/dev/ttyUSB1"
#defineSTOP'@'
intmain()
{
intfd,c=0,res;
structtermiosoldtio,newtio;
charch,s1[20];
printf("start.../n");
fd=open(MODEMDEVICE,O_RDWR|O_NOCTTY);
if(fd<0)
{
perror(MODEMDEVICE);
exit(1);
}
printf("open.../n");
tcgetattr(fd,&oldtio);
bzero(&newtio,sizeof(newtio));
newtio.c_cflag=BAUDRATE|CS8|CLOCAL|CREAD;
newtio.c_iflag=IGNPAR;
newtio.c_oflag=0;
newtio.c_lflag=ICANON;
tcflush(fd,TCIFLUSH);
tcsetattr(fd,TCSANOW,&newtio);
printf("writing.../n");
while(1)
{
while((ch=getchar())!='@')
{
s1[0]=ch;
res=write(fd,s1,1);
}
s1[0]=ch;
s1[1]='/n';
res=write(fd,s1,2);
break;
}
printf("close.../n");
close(fd);
tcsetattr(fd,TCSANOW,&oldtio);
return0;

}