My parrallel port runs very odd under linux. It behaves undetermined.
The next thing sounds funny, but it's no joke:
There seems to be a connection to hard disk accesses: The more hd accesses,
the more "activity" I get on the parport. This is espescially valid for the data bits
of the port. The odd activity starts, as soon as I boot linux. Under windows,
the lines are just set to high. And calm! I have an eprom burner to the port connected,
which works under windows. That's why I think, my parrallel port is all right.
(Even though I connected -12V of of my computers power suply to GND of the parport
some days ago) I am sure, that no other process runs on the port. I tried for example
at init level 1. Maybe linux does not support my parport correctly? On the other hand,
it's not that I don't have any control at all to the port. If I do s.th. like
while (1) outb(0x01,0x378); it will run. But with spikes. I tried my code on a different
machine and on that machine everything worked as expected. No spikes and no
unpredictable behavior. I could write and read from my eprom burner board
Any idea? I don't have any experience with the parport, this is my first project I
am dealing with it. I don't even know exactly, what kind of hardware the parrallel port
is. Please do not hesitate to write me all of your comments, even if it's trivial for you.
All inclusive! 100 MB Speicher, SMS 50% gunstiger, 32 MB Attachment-Gro?e,
Preisvorteile und mehr unter http://club.web.de/?mc=021104
-- To unsubscribe, send mail to: firstname.lastname@example.org --
-- with the single word "unsubscribe" in the body of the message. --
This archive was generated by hypermail 2b29 : Fri Jul 05 2002 - 18:43:44 EDT