102 lines
2.5 KiB
Plaintext
102 lines
2.5 KiB
Plaintext
;********************************************************************************
|
|
; @module keypad4x4
|
|
; @type driver
|
|
; @device 4x4 Matrix Keypad
|
|
; @details
|
|
; The LCD must be connected to a W65C22N Interface Chip:
|
|
; - IO.RB0-7 ->
|
|
; @requires KP_IO: Base Address of IO Chip
|
|
; @depends IO-W65C22N
|
|
;********************************************************************************
|
|
|
|
|
|
.ifndef INCLUDE_KEYPAD
|
|
INCLUDE_KEYPAD = 1
|
|
.ifndef KP_IO
|
|
.fatal "KP_IO is not defined: set it to the base address of the IO chip of the Keypad"
|
|
.endif
|
|
|
|
|
|
RBUF_MEM_START = $200
|
|
RBUF_MEM_END = $2ff
|
|
.define RBUF_NAME "keypad"
|
|
.include "buffer.s65"
|
|
|
|
KB_VAR = $05
|
|
KB_LAST = $06
|
|
|
|
.proc kp_init
|
|
; todo remove
|
|
stz KB_LAST
|
|
; todo remove later
|
|
lda #$ff
|
|
sta KP_IO+IO_DDRB
|
|
stz KP_IO+IO_RB
|
|
|
|
; INIT KEYPAD
|
|
lda #%00001111; KP_IO+IO_RB 0-3 output
|
|
sta KP_IO+IO_DDRB
|
|
stz KP_IO+IO_RB ; KP_IO+IO_RB 4-7 1 so keypad press can be detected
|
|
stz KP_IO+IO_ACR
|
|
|
|
; lda #%00010000 ; set CB1 to interrupt on pos. edge
|
|
lda #IO_PCR_CB1_IP_AE
|
|
sta KP_IO+IO_PCR
|
|
jsr rb_keypad_init ; init keybuffer
|
|
lda #%10010000 ; enable interrupt for CB1 on KP_IO
|
|
sta KP_IO+IO_IER
|
|
rts
|
|
.endproc
|
|
|
|
;********************************************************************************
|
|
; @function Read which key is pressed on the keypad
|
|
; @details
|
|
; Checks which key is pressed and stores it in the keybuffer
|
|
; The value stored in the keybuffer is the offset which must be added to
|
|
; kp_VALUES to retrieve the key that was pressed
|
|
;********************************************************************************
|
|
.proc kp_read_on_irq
|
|
; test each "row" and check which column is 1
|
|
lda #%00001110
|
|
ldx #$00
|
|
jsr @kp_read_column
|
|
lda #%00001101
|
|
ldx #$04
|
|
jsr @kp_read_column
|
|
lda #%00001011
|
|
ldx #$08
|
|
jsr @kp_read_column
|
|
lda #%00000111
|
|
ldx #$0c
|
|
jsr @kp_read_column
|
|
bra @kp_read_rts
|
|
@kp_read_column:
|
|
sta KP_IO+IO_RB
|
|
lda KP_IO+IO_RB
|
|
sta KB_VAR ; store result in zeropage so that bbr can be used
|
|
bbr4 KB_VAR,@kp_write
|
|
inx
|
|
bbr5 KB_VAR,@kp_write
|
|
inx
|
|
bbr6 KB_VAR,@kp_write
|
|
inx
|
|
bbr7 KB_VAR,@kp_write
|
|
rts
|
|
@kp_write:
|
|
; temporary: store last keypress in KB_LAST, TODO: remove
|
|
lda kp_VALUES,x
|
|
sta KB_LAST
|
|
txa
|
|
jsr rb_keypad_write
|
|
@kp_read_rts:
|
|
stz KP_IO+IO_RB
|
|
; lda KP_IO+IO_RB ; read to definetly clear the interrupt flag
|
|
rts
|
|
.endproc
|
|
|
|
.segment "RODATA"
|
|
kp_VALUES:
|
|
; TODO change to literal
|
|
.byte "123A", "456B", "789C", "*0#D"
|
|
.endif
|