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3.  ѧϰʹÓÃselectº¯Ê½¼ì²â´®¿Ú״̬ÐÅÏ¢
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                     Termios Structure Members
MemberDescription
c_cflag
Control options
c_lflag
Line options
c_iflag
Input options
c_oflag
Output options
c_cc
Control characters
c_ispeed
Input baud (new interface)
c_ospeed
Output baud (new interface)
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1.´ò¿ª´®¿Ú
const char * serial_port[]={
"/dev/ttyS0",
"/dev/ttyS1",
"/dev/ttyS2",
"/dev/ttyS3",
"/dev/ttyS4"
};
int serial_open(int port)
{
int fd = open(serial_port[port], O_RDWR|O_NONBLOCK);
if (-1 == fd)
{
perror("Can't Open Serial Port");
exit (-1);
}
else
{
fcntl(fd, F_SETFL, 0);
}
return fd;
}
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 typedef
enum { SERIAL_8N1=0, SERIAL_7E1=1, SERIAL_7O1=2, SERIAL_7S1=3 }serial_format;
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