Programming the parallel port via /dev/lp0

Nerox · 01-06-2005, 12:45 PM

Hi there, does anybody here know how to read and write from/to the parallel port using /dev/lp0? I know i can use /dev/port instead, but it refers to all ports.

TIA

rjlee · 01-07-2005, 03:33 AM

Several ways to access the parallel port are discussed in http://www.tldp.org/HOWTO/IO-Port-Programming.html

Basically, if you ignore the handshaking, then bytes written to lp0 will appear on the port, and bytes read from it will return the values on the port. More complex issues, such as setting the port to be an input, or changing the handshake modes, are in the HOWTO.

Nerox · 01-08-2005, 04:00 AM

I know the HOWTO, there is nothing about how to read and write from/to /dev/lp0. Do you know how to do that?

Thank you

Genjix · 01-09-2005, 05:25 AM

echo -en "Hello, World!!!" > /dev/lp0