Messages in this thread | | | Date | Wed, 30 Jul 2003 20:50:02 +0200 | From | Marc Giger <> | Subject | Re: PATCH : LEDs - possibly the most pointless kernel subsystem ever |
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Hi All,
On Wed, 30 Jul 2003 19:44:57 +0200 Pavel Machek <pavel@suse.cz> wrote:
> Hi! > > > > But this kind of blinkenlights needed pretty fast LEDs. (At 486 > > > time I decided that parport on ISA is fast enough..) > > > > I'll buy some LEDs and build a parallel port connected LED panel > > tomorrow... Do you think the overhead of driving the LEDs would > > have too much of a negative effect on system performance? If so, or > > if we
Yesterday I connected 8 LED's to the parallelport datalines. Today I read this thread. What for a coincidence... The goal of this "project" was to show the current cpu load. It works great now! I can see randomly the LED's lightening up while I am writing this mail:-))
> > I'm not sure. At 486 days I was pretty sure it did not matter. These > days you might get 10% slowdown on some microbenchmark, or something > like that. I do not think it can slow down common tasks. > > My construction of LED lights is extremely flaky, and I'm afraid of > burning printer port. At 486 days ports were expected to survive such > abuse. Not sure if todays EPP/wtf ports can handle that. > Pavel
At beginning I had some fear to connect LEDS directly to the parport, because its an onboard controller (like the most mainboards have). I don't notice system performance slowdowns. (CPU Load code was borrowed from xosview:-))
My personal goal would be to controll a Dot-Matrix Display. The Display should show something like the actual CPU temperature, CPU-load, processes, s.m.a.r.t state, etc etc etc etc..........But my problem is how to beginn with that. I would prefer to controll it with a PCI card. Also I looked today at 68HC11 microcontrollers, which I can connect to the serial port and transmit the needed infos.
Are there suggestions / comments / questions?
If somebody is interested to develop such a card / controller with me, I will be pleased to hear from you!
Thank you
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