linux下串列埠通訊

//配置串列埠

sudo stty -f /dev/ttys1 115200 raw -echo -echoe -echok -crtscts
//更改許可權
sudo
chmod 777 /dev/ttys1
//向串列埠輸出資料
sudo
echo
"hello,world"
> /dev/ttys1

cat /dev/ttys1

#include

#include
#include
#include
#include
#include
#include
#define bufflen 1024
#define rcvtimeout 2
intopenport
(int fd,
int comport)}if
(fcntl
(fd, f_setfl,0)
<0)
printf
("fcntl failed!\n");
else
printf
("fcntl=%d/n"
,fcntl
(fd, f_setfl,0)
);if(
isatty
(stdin_fileno)==0
)printf
("standard input is not a terminal device \n");
else
printf
("fd-open=%d\n"
, fd)
;return fd;
}int
setopt
(int fd,
int nspeed,
int nbits,
char nevent,
int nstop)
bzero
(&newtio,
sizeof
(newtio));
newtio.c_cflag |
= clocal | cread;
newtio.c_cflag &
=~csize;
switch
(nbits)
switch
(nspeed)
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)printf
("set done!\n");
return0;
}int
readdatatty
(int fd,
char
*rcv_buf,
int timeout,
int len)
else
if(retval)
}else
break;}
return pos;
}int
senddatatty
(int fd,
char
*send_buf,
int len)
return1;
}int
main()
if((isetopt =
setopt
(fdserial,
115200,8
,'n',1
))<0)
printf
("serial fdserial=%d\n"
, fdserial)
;tcflush
(fdserial,tcioflush)
;fcntl
(fdserial, f_setfl,0)
;char buffrcvdata[bufflen]=;
unsigned
int readdatanum =0;
while(1
)return1;
}

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