Computer Science Canada Parallelput and Parallelget? |
| Author: | vdemons [ Fri May 27, 2011 3:47 pm ] |
| Post subject: | Parallelput and Parallelget? |
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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| Author: | Tony [ Fri May 27, 2011 3:57 pm ] |
| Post subject: | RE:Parallelput and Parallelget? |
from the same documentation page Quote: 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) -- parallelget |
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| Author: | vdemons [ Fri May 27, 2011 4:11 pm ] |
| Post subject: | RE:Parallelput and Parallelget? |
If thats how you turn it on then how do you turn it off with a command. |
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| Author: | Tony [ Fri May 27, 2011 4:27 pm ] |
| Post subject: | RE:Parallelput and Parallelget? |
set the pin to low |
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| Author: | vdemons [ Fri May 27, 2011 4:30 pm ] |
| Post subject: | RE:Parallelput and Parallelget? |
So would that be parallelput(0)? |
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| Author: | vdemons [ Fri May 27, 2011 4:34 pm ] |
| Post subject: | RE:Parallelput and Parallelget? |
and would parallelget be how you would ground the device or something. |
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