Date: Fri, 27 Oct 2000 07:30:24 -0700 From: Julian Elischer <julian@elischer.org> To: Alexander Maret <maret@atrada.net> Cc: 'Poul-Henning Kamp' <phk@critter.freebsd.dk>, "'msmith@mass.osd.bsdi.com'" <msmith@mass.osd.bsdi.com>, "'freebsd-hackers@freebsd.org'" <freebsd-hackers@freebsd.org> Subject: Re: Accessing the tty structure of an opened device Message-ID: <39F99180.AE1F99E4@elischer.org> References: <58A002A02C5ED311812E0050044517F00D2614@erlangen01.atrada.de>
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Alexander Maret wrote:
>
> > -----Ursprungliche Nachricht-----
> > From: Poul-Henning Kamp [mailto:phk@critter.freebsd.dk]
> > Subject: Re: Accessing the tty structure of an opened device
> >
> > You will need to do this in a device driver, there is no way you
> > can reliably measure that from userland.
> >
> > Trust me on this: I've tried.
>
> That's what I wanted to do. I wanted to write a character device
> which on read() passes the last IR-code.
>
> Well as Mike Smith told me: "you cannot poll the serial line at
> anything like a useful speed to perform IR decoding" my hopes are
> all gone to get a simple solution.
>
> Do I have to write my own serial driver to get what I want or
> is it possible to use functions of the "build in" serial
> device driver?
look at the pcaudio driver
it uses a 16KHz clock to poll out audio..
You can use a similar method to poll in data with little system load....
As for the 'build in' serial driver, it depends on wht your data will
look like....
Julian
>
> Alex
>
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