6502-OS/system/keypad.h65

;;********************************************************************************
;; @file
;; @brief 4x4 Matrix Keypad driver
;; @details
;;   The LCD must be connected to a W65C22N Interface Chip:
;;     - IO.RA0-7  -> 
;; @requires KP_IO: Base Address of IO Chip
;; @depends IO-W65C22N 
;; @ingroup drivers
;;********************************************************************************
.ifndef INCLUDE_KEYPAD
INCLUDE_KEYPAD = 1
.include "system.h65"

;;********************************************************************************
;; @brief 4x4 Matrix Keypad
;;********************************************************************************
.scope kp
KP_IO = IO2
; .import KP_IO
; .ifndef KP_IO
;     .fatal "KP_IO is not defined: set it to the base address of the IO chip of the Keypad"
; .endif

Import      kp, init, read_irq, read
ImportZp    kp,_DEBUG_VAL

BUF_SIZE = 10

.endscope
.endif ; guard