Keypad and DT's Instant Interrupts

[mister_e]

0-3 is 4 bits, so you have to configure to 4 COLUMNs.

maybe 4 colums and 3 row now?

on the other hand my comments in the code above are not right... sorry

for a whole 4X4 keypad it should be

    DEFINE KEYPAD_ROW 4 	 ' 4 ROW keypad
    DEFINE KEYPAD_ROW_PORT PORTB ' ROW port = PORTB
    DEFINE KEYPAD_ROW_BIT 4 	 ' ROW0 = PORTB.4
    DEFINE KEYPAD_COL 4 	 ' 4 COL keypad
    DEFINE KEYPAD_COL_PORT PORTB ' COL port = PORTB
    DEFINE KEYPAD_COL_BIT 0 	 ' COL0 = PORTB.0
    DEFINE KEYPAD_DEBOUNCEMS 20  ' debounce delay = 20 mSec
    DEFINE SCAN_ONCE 1

i have this setup on a EASYPIC4 board and their 4X4 keypad like this


And using the internal pull-up.

their keypad schematic is bellow
http://www.mikroe.com/pdf/keypad_board_schematic.pdf