Messages in this thread | | | Date | Fri, 10 Sep 1999 11:29:28 +0000 | From | Morten Rolland <> | Subject | Re: driver for 3COM USR PCI v.90 modem? |
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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
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