WebHex Keypad Explanation Introduction The hex keypad is a peripheral that connects to the DE2 through JP1 or JP2 via a 40-pin ribbon cable. It has 16 buttons in a 4 by 4 grid, labelled with the hexadecimal digits 0 to F. An example of this can been seen in Figure 1, below. Internally, the structure of the hex keypad is very simple. WebMay 17, 2024 · The value is added into the state through OR operator, and shift up through shift << operator each time the button pin is read, the 0xfe00 is a bit mask that mask-out the higher byte, and sort of means that we only care if the lower byte produce a consecutive stream of 0. ... My logic says to invert the BIN/hex numbers, meaning 0xfe00 becomes ...
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ATmega8 - Basic Input/Output Interfacing - Tutorial #6
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