Messages in this thread | | | Date | Wed, 30 Jul 2003 21:05:25 +0200 | From | Herbert Pötzl <> | Subject | Re: PATCH : LEDs - possibly the most pointless kernel subsystem ever |
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On Wed, Jul 30, 2003 at 08:50:02PM +0200, Marc Giger wrote: > 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.
sounds interesting ...
> Are there suggestions / comments / questions?
http://www.ewal.net/lcd.php http://patrick.wattle.id.au/cameron/information/lcd/
> If somebody is interested to develop such a card / controller with me, I > will be pleased to hear from you!
I'm interested in discussions and willing to share my knowledge (was working with embedded systems) on this issue ...
best, Herbert
> Thank you > > Marc > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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