emailler/drivers/atrinput.s
2015-09-09 14:04:07 +02:00

94 lines
2.5 KiB
ArmAsm

.include "atari.inc"
.export get_key
.export check_for_abort_key
.export get_key_if_available
.export get_key_ip65
.import ip65_process
.data
iocb: .byte 0
kname: .byte "K:",155
.code
; inputs: none
; outputs: A contains ASCII value of key just pressed
get_key:
jsr get_key_if_available
beq get_key
rts
; inputs: none
; outputs: A contains ASCII value of key just pressed (0 if no key pressed)
get_key_if_available:
lda CH ; GLOBAL VARIABLE FOR KEYBOARD
cmp #255
beq @nokey
ldx iocb ; K: already open?
bne @read
ldx #$40 ; IOCB to use for keyboard input
stx iocb ; mark K: as open
lda #<kname
sta ICBAL,x ; 1-byte low buffer address
lda #>kname
sta ICBAH,x ; 1-byte high buffer address
lda #OPEN ; open
sta ICCOM,x ; COMMAND CODE
lda #OPNIN ; open for input (all devices)
sta ICAX1,x ; 1-byte first auxiliary information
jsr CIOV ; vector to CIO
@read:
lda #0
sta ICBLL,x ; 1-byte low buffer length
sta ICBLH,x ; 1-byte high buffer length
lda #GETCHR ; get character(s)
sta ICCOM,x ; COMMAND CODE
jsr CIOV ; vector to CIO
ldx #255
stx CH ; GLOBAL VARIABLE FOR KEYBOARD
rts
@nokey:
lda #0
rts
; process inbound ip packets while waiting for a keypress
get_key_ip65:
jsr ip65_process
jsr get_key_if_available
beq get_key_ip65
rts
;check whether the ??? key is being pressed
;inputs: none
;outputs: sec if ??? pressed, clear otherwise
check_for_abort_key:
; TODO: implement actual check
clc
rts
;-- LICENSE FOR atrinputs.s --
; The contents of this file are subject to the Mozilla Public License
; Version 1.1 (the "License"); you may not use this file except in
; compliance with the License. You may obtain a copy of the License at
; http://www.mozilla.org/MPL/
;
; Software distributed under the License is distributed on an "AS IS"
; basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
; License for the specific language governing rights and limitations
; under the License.
;
; The Original Code is ip65.
;
; The Initial Developer of the Original Code is Jonno Downes,
; jonno@jamtronix.com.
; Portions created by the Initial Developer are Copyright (C) 2009
; Jonno Downes. All Rights Reserved.
; -- LICENSE END --