Date: Tue, 30 Oct 2001 19:25:29 +0200 From: lixu@mail.com To: questions@FreeBSD.ORG Subject: control RTS & RTS Message-ID: <3BDEE289.9030109@mail.com>
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Hi, All!
I have try to control RTS and DTR signal on my /dev/cuaa0.
I use this code from gnokii.org->
-----------------------------------------------------------------------------------------------
int port_setdtrrts(int fd, int dtr, int rts) {
unsigned int flags;
flags = TIOCM_DTR;
if ( !dtr )
if( ioctl( fd, TIOCMBIS, &flags) == -1 ) {
perror("port_setdtrrts: ioctl\n");
return -1;
}
else
if( ioctl( fd, TIOCMBIC, &flags) == -1 ) {
perror("port_setdtrrts: ioctl\n");
return -1;
}
flags = TIOCM_RTS;
if ( !rts)
if( ioctl( fd, TIOCMBIS, &flags) == -1 ) {
perror("port_setdtrrts: ioctl\n");
return -1;
}
else
if( ioctl( fd, TIOCMBIC, &flags) == -1 ) {
perror("port_setdtrrts: ioctl\n");
return -1;
}
return 0;
}// port_setdtrrts
------------------------------------------------------------------
but it seems it is don't work right,
anybody have experience in serial port programming?
i need advise, where is may be a bug ???
in my case when i do port_setdtrrts( port, 1, 0) i have:
DTR= CTS or DSR;
RTS= CTS or DSR;
so the DTR&RTS is depend from CTS&DSR, but i expect a
DTR= 1;(+12V)
RTS= 0; (-12V)
Where are exist a programm for manual control of DTR & RTS ???
any suggestion
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