Subject: Re: RFC: General purpose "general purpose i/o pin" framework
To: None <mcmahill@mtl.mit.edu>
From: Jukka Marin <jmarin@pyy.jmp.fi>
List: tech-kern
Date: 08/13/2002 13:01:58
On Tue, Aug 13, 2002 at 05:51:04AM -0400, mcmahill@mtl.mit.edu wrote:
> Is there anyway to provide some specific timing on these pins?  For
> example I think the '1-wire' interface used by some Dallas Semiconductor
> chips (and others) needs some very specific timing of its pulses.

It's a sick protocol, IMHO.  Too slow for bit-banging and busy-looping,
but too fast for interrupts.  (Well, I don't know the interrupt overhead
of NetBSD on decent pc's or some such, but receiving an interrupt every
few microseconds doesn't sound like a good idea to me.)

  -jm