Date: Thu, 27 May 1999 11:19:37 -0600 From: Wes Peters <wes@softweyr.com> To: Peter Brevik <pb@ludd.luth.se> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: RS232 status lines, read with TIOCMGET.. [solved] :) Message-ID: <374D7EA9.450D8A8B@softweyr.com> References: <199905270753.JAA00777@father.ludd.luth.se>
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Peter Brevik wrote:
>
> Some of you maybe saw my letter about the (4)tty ioctl "TIOCMGET int *state".
> The issue has been solved and the answer is that indeed the sio.c driver only
> reads the status line at opening.
> However a status line change will trigger a interrupt, and cause the driver to
> read status lines once more. Thus functionality achived with minimum cpu load.
>
> Seems the status lines are not sensitive for ground connection. Ie it will not
> change bit value between gnd connection and no connection. I guess that was a
> bad TTL habit :-)
>
> Maybe this could be used in freebsd handbook or other documentation.. ?
> (to help others)
The sio man page would be the appropriate place to put it. You're
saying the driver doesn't detect connection or disconnection of the
signal ground? I don't see how it could, but it can't hurt to document
it anyway.
--
"Where am I, and what am I doing in this handbasket?"
Wes Peters Softweyr LLC
http://www.softweyr.com/~softweyr wes@softweyr.com
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