Hello all. I have a little simple problem but I can't figure it out. I have a system with a 4x4 matrix keyboard, LCD, and a Siemens processor. All system functions are processed inside that microcontroller.I want that system running, and in parallel with it to process by myself its keypad in a PICin parallel with the Siemens micro. I can't change the keys to put a double switch key. I tried to process the keypad with 4 rows and 4 columns connected directly to my pic, and, of course, it didn't worked. The bad thing is that I don't have time to figure out how does the Siemens micro process the keypad, I want an universal sollution for this kind of job. Any ideea woud be great.Thank you very much,
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