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STR71x GPIO SCANNING A 4x4 MATRIX KEYPAD

3.2 DISPLAYS

Depending on which display is selected, and using a Hexadecimal to 7-segment display cor-

respondance table, the corresponding key code is extracted, then decoded to a 7-segment

display and finally sent to the 7-segment LED display.

3.3 FLOWCHARTS

KeyPressed = True

Yes

No

main

Configure XTI

Configure GPIO ports

Configure Timer 0

Configure EIC

Displayer = 0

KeyPressed = False

Display Pressed Key

Displayer = Displayer +1

Displayer = 4

Yes

No