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7 SEGMENT DISPLAY
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segment.s implements the logic behind displaying numbers between 0 and 9 on
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a 7 segment display. The PIN configuration is the following:
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* a - DIGITAL PIN 0
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* b - DIGITAL PIN 1
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* c - DIGITAL PIN 2
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* d - DIGITAL PIN 3
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* e - DIGITAL PIN 4
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* f - DIGITAL PIN 5
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* d - DIGITAL PIN 6
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All these PINs are connected on PORTD, so we need to keep that in mind when
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writing our output to the correct PORT.
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The boolean formulas used to configure the PINs are calcualted using
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Karnaugh Diagrams.
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As a final word, don't forget to add resistors in series with each display
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PIN, on the breadboard, because I forgot to do so and I completely screwed
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a display.
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