mirror of
https://github.com/irmen/prog8.git
synced 2024-11-23 22:33:12 +00:00
101 lines
3.5 KiB
Lua
101 lines
3.5 KiB
Lua
%import textio
|
|
%zeropage basicsafe
|
|
%option no_sysinit
|
|
|
|
; The documentation for custom PS2 key handlers can be found here:
|
|
; https://github.com/X16Community/x16-docs/blob/master/X16%20Reference%20-%2002%20-%20Editor.md#custom-keyboard-scancode-handler
|
|
|
|
main {
|
|
|
|
sub start() {
|
|
|
|
txt.print("ps2 custom key handler test - press keys! esc to quit!\n")
|
|
|
|
sys.set_irqd()
|
|
uword old_keyhdl = cx16.KEYHDL
|
|
cx16.KEYHDL = &keyboard_scancode_handler
|
|
sys.clear_irqd()
|
|
|
|
bool escape_pressed
|
|
while not escape_pressed {
|
|
handle_keyboard_event()
|
|
}
|
|
sys.set_irqd()
|
|
cx16.KEYHDL = old_keyhdl
|
|
sys.clear_irqd()
|
|
}
|
|
|
|
; Keyboard handler communication variables.
|
|
; these need to be in block scope instead of in a subroutine,
|
|
; so that they won't get overwritten with initialization values every time.
|
|
; The assembly keyboard handler will set these, prog8 will read them.
|
|
bool @shared keyhdl_event ; is there a keyboard event to handle?
|
|
ubyte @shared keyhdl_prefix
|
|
ubyte @shared keyhdl_scancode
|
|
ubyte @shared keyhdl_updown
|
|
|
|
sub handle_keyboard_event() {
|
|
; Potentially handle keyboard event.
|
|
; Note that we do this from the program's main loop instead of
|
|
; the actual keyboard handler routine itself.
|
|
; The reason for this is documented below in the handler assembly routine.
|
|
if not keyhdl_event
|
|
return
|
|
keyhdl_event = false
|
|
txt.print_ubhex(keyhdl_prefix, true)
|
|
txt.chrout(':')
|
|
txt.print_ubhex(keyhdl_scancode, true)
|
|
txt.spc()
|
|
if keyhdl_updown
|
|
txt.chrout('u')
|
|
else
|
|
txt.chrout('d')
|
|
txt.nl()
|
|
if keyhdl_prefix==0 and keyhdl_scancode==119 and keyhdl_updown {
|
|
; escape was pressed! exit back to basic
|
|
main.start.escape_pressed = true
|
|
}
|
|
}
|
|
|
|
asmsub keyboard_scancode_handler() {
|
|
|
|
; NOTE that the keyboard handler is an asm subroutine.
|
|
; Unfortunately is it not possible to use prog8 code or calls here,
|
|
; because the X register gets overwritten here (to store the prefix byte)
|
|
; and prog8 uses the X register internally (for the evaluation stack).
|
|
; So it is unsafe to call prog8 code from here because the evaluation stack pointer
|
|
; will be invalid which produces undefined results.
|
|
; So, instead, we store the various keyboard event bytes and signal
|
|
; the main prog8 program that a keyboard event has occurred.
|
|
; It then processes it independently from the assembly code here.
|
|
;
|
|
; Unfortunately this also means you cannot decide from that prog8 code
|
|
; if the keyboard press should be consumed/ignored or put into the keyboard queue
|
|
; (this is controlled by returning 0 or 1 in register A here)
|
|
;
|
|
; see:
|
|
; https://github.com/X16Community/x16-docs/blob/master/X16%20Reference%20-%2002%20-%20Editor.md#custom-keyboard-scancode-handler
|
|
|
|
%asm {{
|
|
php
|
|
pha
|
|
phx
|
|
stz keyhdl_updown
|
|
bcc +
|
|
inc keyhdl_updown
|
|
+ stx keyhdl_prefix
|
|
sta keyhdl_scancode
|
|
lda #1
|
|
sta keyhdl_event
|
|
; we can do additional stuff here and decide if we want to
|
|
; consume the key event or not (A=0 or A!=0)
|
|
plx
|
|
pla
|
|
lda #0 ;By setting A=0 we will remove this key event for now
|
|
tax
|
|
plp
|
|
rts
|
|
}}
|
|
}
|
|
}
|