Author Topic: IO Port  (Read 1295 times)

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Offline toraora

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IO Port
« on: May 01, 2012, 07:31:10 pm »
Hi all,

When I try writing anything to port, e.g.
Code: [Select]
3->portthe calculator becomes unusably laggy (~5 sec delays) as soon as the program terminates.
I'm running OS 2.53 on a TI84+ SE.

Is port not functioning as it should, or am I using it incorrectly?

THanks,
toraora

Offline Runer112

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Re: IO Port
« Reply #1 on: May 01, 2012, 07:37:09 pm »
To quote the official commands list, Commands.html, which you can find in your Axe download:

EXP→Port   Key: ClrTable      Sets the link port to a given status with a number 0-3. Must exit program with status 0 if changed!

If you do not reset the port status with 0→port before returning to the OS, the OS will see that the port is active and will constantly check for link activity that isn't there.
« Last Edit: May 01, 2012, 07:38:41 pm by Runer112 »

Offline toraora

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Re: IO Port
« Reply #2 on: May 01, 2012, 07:53:16 pm »
ah, ok.

Thanks!

Offline Nick

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Re: IO Port
« Reply #3 on: May 02, 2012, 08:53:40 am »
can someone explain what this function does exactly? i've looked for it, but never found something.. what kind of status is it?

Offline Eiyeron

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Re: IO Port
« Reply #4 on: May 02, 2012, 09:05:19 am »
Visiby, it opens the port, maybe 0 = close,  1 = read, 2 = write, and 3= both modes...

Offline Builderboy

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Re: IO Port
« Reply #5 on: May 02, 2012, 10:27:25 am »
can someone explain what this function does exactly? i've looked for it, but never found something.. what kind of status is it?

It is used for communicating over the link port.  You may or may not know that the link cable has 3 wires called ring, tip, and ground.  Software cannot change the ground wire, but it can change the ring and the tip.  By writing a number from 0-3 into port, you are directly controlling these 2 wires.  By reading from Port, you are testing the current value of those two wires