How to interface keyboard to dot matrix LEDs through 8051?

[seanthearakh]

Please introduce me how to interface Keyboard to Dot matrix leds through 8051

 

[IanP]

Re: Interface keyboard!

Start with connecting PS/2 (or AT) keyboard ..
Here you will find working code:
**broken link removed**
You can modify this code in such a way that the microcontroller will send "key-pressed" ASCII code via serial port to your PC (with Hyperterminal) for verification ..

Regards,
IanP

 

[mcs51mc]

Re: Interface keyboard!

I think that the kb.asm code from the 8052.com site is crap
The KEYB_CLOCK line is connected to P3.2 (INT0) but there's no EX0 ISR

Did you get that code to work?

I can play with the keyboard leds but I can't get correct key codes. From that I assume that my hardware is ok.

Correct me if I'm wrong:
The clock line should be interrupt driven since you never know when the user hit a key. If you poll the clock line when your other code is done you can miss some bits from the start of transmission.
Interrupt driven is therefore the only way to go?

Someone with working interrupt driven (preferably ASM) code to share?
Thanks in advance...

 

[segmex]

Interface keyboard!

i need application note for keyboard...

i need it

thanks

 

[mcs51mc]

Re: Interface keyboard!

i need application note for keyboard...

i need it

thanks

Is it possible to be even less specific !!!!

Google "AT keyboard protocol" lots of hits how an AT keboard "talks" to a computer.

Translate that to 8051µC and let me know the outcome....
I'm still busy

 

[jayavardhan]

Interface keyboard!

r u using simplex keyboard or matrix keyboard.

 

[ashad]

Re: Interface keyboard!

i need application note for keyboard...

i need it

thanks

Is it possible to be even less specific !!!!

Google "AT keyboard protocol" lots of hits how an AT keboard "talks" to a computer.

Translate that to 8051µC and let me know the outcome....
I'm still busy

hi segmex & mcs51mc

no need to spend time for searching ...... just click on the following link u will get the best Tutorial about ATkeyboard

 

[ajay_bhargav]

Re: Interface keyboard!

maybe this one can please you... hehe

PC Keyboard+LCD Example

 

[vijaya_narayana]

Re: Interface keyboard!

there r some micro controller with built in keyboard function u can search the controllers and use it