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how to interface a keypad in arm7. what is the programing code for it. my keypad using for notice led display
You have zero ideas how to interface that keypad?
And you have seen zero other projects on the net that interfaces a microcontroller with a keypad?
Next thing - "what is the programming code for it" is a quite interesting question, since "the programming code" would depend on what processor you use, and what interface that keyboard has, what processor pins that are used, if you use pull-up or pull-down, ...
I think you should return to the drawing board and spend a bit more time thinking about this problem yourself.