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PS/2 keyboard DIY from scratch ?

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neazoi

neazoi

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Hi a project of mine accepts a ps2 keyboard for input.
To avoid having to carry a ps2 keyboard with me, I want to build (not to buy) a mini version of a ps2 keyboard and include it inside the project.
Currently, the only project I am aware of are this
**broken link removed**
And its english keyboard encoding here (also attached) https://nicotak.com/keyboard/firm008eng.zip

The problem is that by looking at the code in the english version (attached) he uses combination for ESC, F1, F2, F3, F4 keys. The combinations are

// ctrl + 1 = F1
// ctrl + 2 = F2
// ctrl + 3 = F3
// ctrl + 4 = F4
// ctrl + E = ESC

But the ctrl key is used for another purpose in my project.
Can you please help me to change the ctrl to another key, for example ALT?
 

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  • firm008eng.zip
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Hi,

Are you sure you want PS/2 interface?

If so: It should be rather simple:
* The PS/2 hardware of the interface is simple and you will find lot´s of information about it. Simply do a search. Even wikipedia has enough of information.
* the PS/2 protocol is also simple. The codes can be found easily in the internet, too. Just do a search on "PS/2 keyboard codes"

Klaus
 
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    neazoi

    neazoi

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KlausST said:
Hi,

Are you sure you want PS/2 interface?

If so: It should be rather simple:
* The PS/2 hardware of the interface is simple and you will find lot´s of information about it. Simply do a search. Even wikipedia has enough of information.
* the PS/2 protocol is also simple. The codes can be found easily in the internet, too. Just do a search on "PS/2 keyboard codes"

Klaus
Click to expand...

I know, but I have not found a "complete" ps2 keyboard online. I do not want to design my own currently as there is no time.
If I could only replace the CTRL key with the ALT in the key combinations, that should be fine.

I attach you the C code.
I may be able to tweak it myself but a help from an experienced member would help.

By the way how can I build the hex for it, which compiler to use? (free)
 

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