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vdemons

Fri May 27, 2011 3:47 pm


Parallelput and Parallelget?

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I need to how to use parallelput  to turn an LED on from one of the pins of a parallel port. I already read the tutorial (http://compsci.ca/holtsoft/doc/parallelput.html) but I don't understand if an LED is on using "parellelput (2)" [pin 2=on, I think] and if it is, how I would turn it off using another command, and what does it mean by data bit 7-0.

Also one more thing what is parallelget and how do I use it.

Please and thank you in advance!

P.S. how do you turn more than one LED on.


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Tony

Fri May 27, 2011 3:57 pm


RE:Parallelput and Parallelget?

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from the same documentation page

For example, the command parallelput (97) sets data bits 0, 5 and 6 high (97 = 1 + 32 + 64) and sets the other data pins low. Because there are only 8 data pins in the parallel port, the value passed to parallelput must be from 0 to 255.


Setting a particular pin as "high" means supplying it with a +5v voltage. If it's wired to run through the LED and into the ground, the current will flow and the light will come on.

Since you know what
parallelput does, you can take a guess at how
parallelget works. Then check the documentation to make sure that you have the right ideas (and right pins) -- [tdoc]parallelget[/tdoc]


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vdemons

Fri May 27, 2011 4:11 pm


RE:Parallelput and Parallelget?

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If thats how you turn it on then how do you turn it off with a command.


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Tony

Fri May 27, 2011 4:27 pm


RE:Parallelput and Parallelget?

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set the pin to low


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vdemons

Fri May 27, 2011 4:30 pm


RE:Parallelput and Parallelget?

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So would that be parallelput(0)?


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vdemons

Fri May 27, 2011 4:34 pm


RE:Parallelput and Parallelget?

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and would parallelget be how you would ground the device or something.