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PICList Thread
'Keyboards and PICs'
1998\03\21@195329 by Jon Baker

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Has anyone got any source code for connecting AT or PS2 keyboards to pics?
... or do I have to write it myself?

The interface keyboards is quite strange and I dont know how to support an
I/O line which can be either an input or an output at the choice of the
keyboard.

Does anyone have any help?

1998\03\21@202517 by Don McKenzie

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Jon Baker wrote:
>
> Has anyone got any source code for connecting AT or PS2 keyboards to
> pics?
> ... or do I have to write it myself?
>
> The interface keyboards is quite strange and I dont know how to
> support an
> I/O line which can be either an input or an output at the choice of
> the
> keyboard.
>
> Does anyone have any help?

try:
http://www.arne.si/~mauricio/PIC.HTM

Don McKenzie  spam_OUTdonTakeThisOuTspamdontronics.com   http://www.dontronics.com

Don's Download Dungeon http://www.dontronics.com/download.html
For more details, send a blank message to .....infoKILLspamspam@spam@dontronics.com
or simstickspamKILLspamdontronics.com or .....basicsKILLspamspam.....dontronics.com

1998\03\23@031501 by paulb

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Jon Baker wrote:

> The interface keyboards is quite strange and I dont know how to
> support an I/O line which can be either an input or an output at the
> choice of the keyboard.

 Actually, it's in effect a variant of I2C, or vice-versa (that is to
say, I2C is a variant of the PC keyboard protocol!).  Almost all rules
are the same, you have a clock and data; lines are driven by open-
collector drivers with a pull-up at one end (at least), the slave
can stretch data by holding the clock, other things elude me.

 If therefore you can write I2C code, you are off to a flying start for
a PC keyboard.  I fancy the Apple (AKB) is virtually the same concept
too (any comments?).

 Cheers,
       Paul B.

1998\03\24@005441 by Adi

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www.paranoia.com/~filipg/HTML/LINK/PORTS/F_Keyboard_FAQ.html

Lots of info on PC keyboards and a link to a PIC keyboard source.
I've looked at using a PC keyboard as input device. Haven't had time
to do anything yet, though. Interfacing shouldn't be difficult as
it's a simple serial protocol...

Regards,
Adi

> Has anyone got any source code for connecting AT or PS2 keyboards to pics?
> ... or do I have to write it myself?
>
> The interface keyboards is quite strange and I dont know how to support an
> I/O line which can be either an input or an output at the choice of the
> keyboard.
>
> Does anyone have any help?
>

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