Re: Treating parallel port as serial device

[Jean-Christian de Rivaz <jcdr@lightning.ch>]

Take a look to the MAX3100 chip:
http://pdfserv.maxim-ic.com/arpdf/MAX3100.pdf

This solution highly reduce the CPU overhead needed to sample Rx line 
for each single bit. The chip have a FIFO, an interrupt and look like a 
standard UART. Only the bus transfert with the CPU is different.

I curently work on a driver for it.

Regards,

Tony Hoyle wrote:
> I'm looking to attach a serial device to my box that has only TTL level
> I/O.  Since I'm more of a software than a hardware person making a
> circuit board up with a max232 in is a bit risky...  I want to connect
> the I/O to the parallel port.
> 
> What I need now is a driver that can read the input from a  pin on the
> parallel port and treat it as serial input.  It sounds like the kind of
> project that would have been done before, but I can't find anything that
> even comes close.  Userspace probably wouldn't cut it as I'm reading as
> 9600 baud and usleep doesn't have nearly enough resolution.
> 
> Tony
> 
>