You have not mentioned how you propose to handle visual feedback to the user.Įstimated time to write & test about 3 hours or a bottle of Aberlour a'bunadh to which I have become very partial in my latter days (providing it is not a school project). I suggest that you write the 3X4 keypad routine as another state machine, which can be driven by say a 10ms. The state & sub-states become indexes to an array of key entries. timer expires increment the Substate until it expires or another key is pressed. If the same key is pressed before the "x" ms. If another key is pressed or "x" milliseconds have elapsed enter the last key press into a receive buffer and go to the next state or the IDLE state.
The state machine starts in the IDLE state (State0), Pressing any of the keys will get you to a new state State1-12 & Substate=0. keypad library in c for atmel studio and arduino ide. This is what I did last time I wrote a routine like this for a PIC :oops::roll: in asm :oops::roll: which was quite elegant.įor a 3x4 keypad, it will be a State machine with 13 states and each state can have sub-states dependent how many characters you wish to assign to each key
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