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Can you do LCD driver with a keypad using CPLD?

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ZeleC

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lcd driver + keypad

hello
i would like to know if a 16*2 lcd driver + a keypad could be done with a CPLD
in other words i want to be able to type a key on the keypad and to see it on the lcd ...
and if yes can u give me some documents or some links
thx in advance
 

Re: lcd driver + keypad

Hi.


if you want evryting you can do. 8) !!!

It is more simple to design that with a small uC like 8051,avr,pic. :D

But ... if you want do it with cpld you will need to make
two nice state macine 8O one for keyboard-search+debounce,
the second for installing the start commands of the lcd
and afther that the transfering of the data from the keyborad machine
to the display.

what familiar clpld/fpga you want to use? xilinx,altera,cypress....
and in what langue vhdl,verilog....?


Best regards. :wink:
 

Re: lcd driver + keypad

Hi Zelec, first take a look on the 74C922 from National Semiconductor
from the data you can make your own keypad decoder on CPLD.

If you use 4 bit mode for LCD you save a lot of CPLD resources.
LCD intelligent displays need only 3 control signals R/W, E, RS.

here is a link for the 74C922/923.pdf
**broken link removed**

I will find some articles for you about controlling LCDs the easy way

I am working on something similar these days not CPLD just PIC so
the info will be usefull to you as well.

Tornado
 

Re: lcd driver + keypad

Forget a CPLD .. forget a CPU ... get a FPGA + CPU for less
the 250 cells goes for $7
The solution is a TRISCEND SOC it cames in two flavors E5 = 51 CPU
or A7 = arm CPU look at
Keypads + LCD drivers .. just drag & drop
http://www.triscend.com/

or look for appnote AN15 and AN20 at

http://www.triscend.com/products/apnotes.htm
 

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