Pseudo-Code of the KPC software

AN2421

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3

Pseudo-Code of the KPC software

DEFINITIONS

BB_GPIO_n

801_GPIO_n

Max_X = 8

Max_Y=8

INITIALIZATION

Set BB_GPIO as inputs

Set 801_GPIO as outputs

Set 801_GPIO to output 0xFF

VARIABLES

XCount=0

YCount=0

LOOP

YCount=0

LOOP

<I2C Transaction> Set 801_GPIO to output ( ~(YCount<<0x01) )

READ BB_GPIO (and interpret keypress)

YCount++

END LOOP IF YCount = Max_Y

WRITE_KEYS_TO_BUFFER

END LOOP