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What kind of interface with keypad do you use?
There are some way,
4bit x 2 digital input...
Resistive divider and analog input..
I assume you are using digital input.
you can use shadow register also.
Anyway, This is a complex issue
tanks por your helpthis is the document the file subrutinateclado is the library for keypad.
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Hi I got glance it.
I can't say anything about cause but,
I would give you an actual working design of mine.
Please cloning into C27433, Wipe out unuse mudules.
It is C code, you can understand easily, I think.
I can't talking so much, It is sorry.
Please treat as "As Is"
There are some Extra !
MatrixKey.Archive1.zip 534.3 K