lkml.org 
[lkml]   [1999]   [Sep]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: driver for 3COM USR PCI v.90 modem?
Daniel J Blueman wrote:
>
> Writing a softmodem driver should be fairly tricky, all in.

It is. Have a look at

http://www.linmodems.org/
http://home.telia.no/Morten.Rolland/linux/i4lfax/

for info on some projects trying to deal with this
kind of problem.

> I must admit, I had a couple of softmodems in computers at home here, but I
> ditched one for a real modem. If I can get some tech docs, I'd try my hand
> at writing a driver. Hmmm...

I think the term 'driver' is misleading; a typical driver
is a "thin" layer that interfaces the hardware and exports
it cleanly. With passive ISDN cards and probably WinModems
to varying degrees, we need DSP algorithms, link-level
handeling, flow-control, state-machines, command
interpreters etc. to make it work.

I'd call it "modem DSP software" instead of a driver,
if for no other reason to illustarte the size of the
task at hand.

The 'i4lfax' project views the driver as the access
method to the medium, and runs the fax/modem DSP software
on top of the driver, in a userspace process (ca. 13000 lines
of code today, twise that including tables).

Regards,
Morten Rolland

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:53    [W:0.040 / U:0.168 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site