Serial port not working in 10.10

[Goran Hasse]

2010/12/18 Tom H <tomh0665 at gmail.com>

> On Sat, Dec 18, 2010 at 3:56 AM, Goran Hasse <gorhas at gmail.com> wrote:
> > 2010/12/18 Tom H <tomh0665 at gmail.com>
> >> On Sat, Dec 18, 2010 at 1:53 AM, Goran Hasse <gorhas at gmail.com> wrote:
> >>>
> >>> My serial port /dev/ttyS0 is not working in Ubuntu 10.10.
> >>
> >> Have you created an upstart job for it?
> >
> > This is connected hardware and should not need a upstart job!
> >
> > I have tried all kinds of serial-modules (witch should it bee?) and both
> > minicom and cu (connect unix) without success. So I think it is a device
> > driver problem...
>
> Pre-upstart, you had to have a line like "T0:23:respawn:/sbin/getty -L
> ttyS0 9600 vt100" in "/etc/inittab" to use a serial console. You now
> need an upstart job.


I don't understand why. If the device driver is in the kernel or the
correct module is loaded the device node /dev/ttyS0 is a entry
to the device driver. So if I make open("/dev/ttyS0",...) I should be
able to write bytes to the serial port.

I have tried to manipulate the all kinds of flags in the termios struct
like

if ( ( fd = open( port , O_RDWR | O_NONBLOCK | O_NOCTTY | O_SYNC )) < 0 ) {
     printf("FEL\n");
     exit(1);
 }

 tcgetattr( fd , &term );

 term.c_cflag = CS8;
 term.c_cflag |= CREAD ;
 term.c_cflag |= CLOCAL ;
 term.c_lflag &= ~(ECHO | ICANON );

But no bytes on the pinns... So there must be a secrett with the device
driver...

Note: This works with Knoppix and FreeBSD so there is no problem with the
hardware.

GH

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-- 
gorhas at gmail.com
Göran Hasse
Boo 229
715 91  ODENSBACKEN
Mob: 070-5530148
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