2024-01-09 02:29:18 +01:00
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.include "ps2_keyboard_text_handler.h65"
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Export kb, init, char, keycode
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Export kb, CHARS_NOMOD, CHARS_MODRALT, CHARS_MODSHIFT, CHARS_NUMLOCK_OFF, CHARS_NUMLOCK_ON
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ExportZp kb, modifier
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.zeropage
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modifier: .res 1
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.bss
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previous_scancode: .res 1 ; all 1 if previous_scancode is break
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char: .res 1
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keycode: .res 1
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.code
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;;********************************************************************************
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;; @function Initialize the keyboard handler
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;; @returns Z: Z = 1 => success, Z = 0 => failure
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;; @details:
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;; Initializes the PS/2 keyboard driver and the handler.
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;; If any PS/2 command fails, init returns with Z = 0. The failed command (and parameter) can be loaded from `ps2kb::send_cmd` and `ps2kb::send_data`
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;; After init, the keyboard will be able to send scancodes.
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;; @modifies A, X, Y
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;;********************************************************************************
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.proc init
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stz modifier
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stz char
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stz keycode
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stz previous_scancode
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jsr ps2kb::init
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; init & reset
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ps2kb_CmdSelfTest
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ps2kb_WaitFinishCmd
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lda ps2kb::cmd_response+1
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cmp #$aa
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bne fail
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; set set 3
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ps2kb_CmdSetScancodeSet 3
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ps2kb_WaitFinishCmd
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lda ps2kb::cmd_response+1
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cmp #ps2kb::ACK
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bne fail
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; toggle-behaving keys
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ldx #kb::K::CAPSLOCK
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jsr set_make
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ldx #kb::K::NUMLOCK
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jsr set_make
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ldx #kb::K::SCROLLLOCK
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jsr set_make
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; modifiers
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ldx #kb::K::LEFTSHIFT
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jsr set_make_release
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ldx #kb::K::RIGHTSHIFT
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jsr set_make_release
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ldx #kb::K::LEFTCTRL
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jsr set_make_release
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ldx #kb::K::RIGHTCTRL
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jsr set_make_release
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ldx #kb::K::LEFTALT
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jsr set_make_release
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ldx #kb::K::RIGHTALT
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jsr set_make_release
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ldx #kb::K::LEFTMETA
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jsr set_make_release
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ldx #kb::K::RIGHTMETA
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jsr set_make_release
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ps2kb_CmdEnable
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ps2kb_WaitFinishCmd
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lda ps2kb::cmd_response
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cmp #ps2kb::ACK
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bne fail
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StoreDByte process_scancode, ps2kb::scancode_handler
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jsr ps2kb::begin_receive
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lda #0 ; set Z = success
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fail:
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rts
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set_make:
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; x must be set to scancode
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lda #$fd
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bra set
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set_make_release:
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; x must be set to scancode
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lda #$fc
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set:
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ldy #0
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jsr ps2kb::send_command
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ps2kb_WaitFinishCmd
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lda ps2kb::cmd_response+1
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cmp #ps2kb::ACK
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bne fail
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rts
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.endproc
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;;********************************************************************************
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;; @function Process a scancode
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;; @details
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;; Update modifier bits if a mod key is pressed.
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;; If the key is not a mod key, the keycode is stored in kb::keycode
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;; If the key is an ascii character, the corresponding ascii character is stored in kb::char
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;; @modifies A, X
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;;********************************************************************************
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.proc process_scancode
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; check how this scancode needs to be interpreted
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ldx ps2kb::scancode
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bit previous_scancode
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jmi break_key ; bit 7 set = BREAK
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2024-01-11 20:51:45 +01:00
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cpx #$60 ; codes >= 60 in separate table to reduce memory consumption
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bcs x_ge_60
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2024-01-09 02:29:18 +01:00
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bbs kb::MOD::SHIFT, modifier, modshift ; if shift active
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bbs kb::MOD::RALT, modifier, modralt ; if ralt active
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; load from the correct table, if 0 => non-char, if 1 => non-char but mod, else char
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nomod:
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lda CHARS_NOMOD,x
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bra check_char
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2024-01-11 20:51:45 +01:00
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modralt:
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lda CHARS_MODRALT,x
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2024-01-09 02:29:18 +01:00
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bra check_char
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modshift:
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lda CHARS_MODSHIFT,x
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check_char:
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beq not_mod ; 0 => not mod and not char
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cmp #1 ; 1 => mod
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beq is_mod
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@char: ; store char
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sta char
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not_mod: ; store keycode if not mod
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stx keycode
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_rts:
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rts
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2024-01-11 20:51:45 +01:00
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x_ge_60: ; x >= $60
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cpx #$90 ; only BREAK is higher than 8F, (also code table only has 8F bytes)
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bcs check_release
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; CHARS_NUMLOCK_OFF - CHARS_NOMOD = 60 -> no need to subtract $60 first
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; CHARS_NUMLOCK_ON - CHARS_MODSHIFT = 60 -> no need to subtract $60 first
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bbs kb::MOD::NUMLOCK, modifier, modshift ; if numlock active
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lda CHARS_NOMOD,x
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bra check_char
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check_release: ; x >= $90
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; DEBUG
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lda #'9'
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sta char
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cpx #kb::K_BREAK
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2024-01-09 02:29:18 +01:00
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bne _rts
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lda #$ff
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sta previous_scancode
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rts
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is_mod:
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; check which mod
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cpx #kb::K::LEFTSHIFT
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beq set_shift
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cpx #kb::K::RIGHTSHIFT
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beq set_shift
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cpx #kb::K::RIGHTALT
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beq set_rightalt
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cpx #kb::K::LEFTALT
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beq set_leftalt
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cpx #kb::K::RIGHTMETA
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beq set_meta
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cpx #kb::K::LEFTMETA
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beq set_meta
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cpx #kb::K::RIGHTCTRL
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beq set_ctrl
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cpx #kb::K::LEFTCTRL
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beq set_ctrl
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cpx #kb::K::CAPSLOCK
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beq toggle_capslock
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cpx #kb::K::NUMLOCK
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beq toggle_numlock
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cpx #kb::K::SCROLLLOCK
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beq toggle_scrolllock
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; a real keycode and not a released keycode, twobyte or release scancode
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set_ctrl:
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smb kb::MOD::CTRL, modifier
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rts
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set_meta:
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smb kb::MOD::META, modifier
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rts
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set_leftalt:
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smb kb::MOD::LALT, modifier
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rts
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set_rightalt:
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smb kb::MOD::RALT, modifier
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rts
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set_shift: ; process shift
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bbs kb::MOD::CAPSLOCK, modifier, @unset_shift ; CAPSLOCK unset shift when capslock is on
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@set_shift:
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smb kb::MOD::SHIFT, modifier
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rts
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@unset_shift:
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rmb kb::MOD::SHIFT, modifier
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rts
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toggle_numlock: ; toggle numlock
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lda modifier
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eor #kb::MOD::NUMLOCK
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sta modifier
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bra update_leds
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toggle_scrolllock: ; toggle numlock
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lda modifier
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eor #kb::MOD::SCROLLLOCK
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sta modifier
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bra update_leds
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toggle_capslock: ; toggle capslock & shift
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lda modifier
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eor #(kb::MOD::CAPSLOCK | kb::MOD::SHIFT)
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sta modifier
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; fallthrough
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load_update_leds:
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lda modifier
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update_leds:
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and #%00000111 ; only bottom 3 bits allowed - otherwise command fails
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tax
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ps2kb_CmdSetLeds
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rts
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.endproc
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;;********************************************************************************
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;; @details
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;; Unset modifier bits if a mod key is released.
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;; @param X: The scancode
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;; @modifies:
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;;********************************************************************************
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.proc break_key
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; rmb kb::PREVIOUS::BREAK, kb::previous_scancode
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stz previous_scancode
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2024-01-11 20:51:45 +01:00
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; DEBUG
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lda #'F'
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sta char
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2024-01-09 02:29:18 +01:00
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; check mod keys
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cpx #kb::K::LEFTSHIFT
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beq unset_shift
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cpx #kb::K::RIGHTSHIFT
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beq unset_shift
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cpx #kb::K::RIGHTALT
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beq unset_rightalt
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cpx #kb::K::LEFTALT
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beq unset_leftalt
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cpx #kb::K::RIGHTMETA
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beq unset_meta
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cpx #kb::K::LEFTMETA
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beq unset_meta
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cpx #kb::K::RIGHTCTRL
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beq unset_ctrl
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cpx #kb::K::LEFTCTRL
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rts
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2024-01-11 20:51:45 +01:00
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unset_shift: ; process shift
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2024-01-09 02:29:18 +01:00
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bbs kb::MOD::CAPSLOCK, modifier, @set_shift ; set shift when capslock is on
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rmb kb::MOD::SHIFT, modifier ; unset if capslock is off
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rts
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@set_shift:
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2024-01-11 20:51:45 +01:00
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smb kb::MOD::SHIFT, modifier
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2024-01-09 02:29:18 +01:00
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rts
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unset_ctrl:
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rmb kb::MOD::CTRL, modifier
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rts
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unset_meta:
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rmb kb::MOD::META, modifier
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rts
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unset_leftalt:
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rmb kb::MOD::LALT, modifier
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rts
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unset_rightalt:
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rmb kb::MOD::RALT, modifier
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rts
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.endproc
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.rodata
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.align 256
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CHARS_NOMOD:
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.byte "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00^\x00"
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.byte "\x00\x01\x01<\x01q1\x00\x00\x01ysaw2\x00"
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.byte "\x00cxde43\x00\x00 vftr5\x00"
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.byte "\x00nbhgz6\x00\x00\x01mju78\x00"
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.byte "\x00,kio09\x00\x00.-l\xEFp\xE2\x00"
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.byte "\x00\x00\xE1#\xF5`\x00\x00\x01\x01\x00\x00\x00\x00\x00\x01"
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2024-01-11 20:51:45 +01:00
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CHARS_NUMLOCK_OFF:
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.byte "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
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.byte "\x00\x00\x00\x00\x00\x00\x01/\x00\x00\x00\x00+\x00*\x00"
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.byte "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x01\x00-\x00"
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2024-01-09 02:29:18 +01:00
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CHARS_MODSHIFT:
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.byte "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xDF\x00"
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.byte "\x00\x01\x01>\x01Q!\x00\x00\x01YSAW\"\x00"
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.byte "\x00CXDE$\xED\x00\x00 VFTR%\x00"
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.byte "\x00NBHGZ&\x00\x00\x01MJU/(\x00"
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.byte "\x00;KIO=)\x00\x00:_L\xEFP\xE2\x00"
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.byte "\x00\x00\xE1'\xF5`\x00\x00\x01\x01\x00\x00\x00\x00\x00\x01"
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2024-01-11 20:51:45 +01:00
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CHARS_NUMLOCK_ON:
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.byte "\x00\x00\x00\x00\x00\x00\x00\x00\x001\x0047\x00\x00\x00"
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.byte "0.2568\x01\x00\x00\x003\x00\x009\x00\x00"
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.byte "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x01\x00\x00\x00"
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2024-01-09 02:29:18 +01:00
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CHARS_MODRALT:
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.byte "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xFF\x00"
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.byte "\x00\x01\x01|\x01\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00"
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|
|
.byte "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
|
|
|
|
|
.byte "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00{[\x00"
|
|
|
|
|
.byte "\x00\x00\x00\x00\x00}]\x00\x00\xA5\xB0\x00\x00\x00\x00\x00"
|
|
|
|
|
.byte "\x00\x00\x00\x00\x00\x00\x00\x00\x01\x01\x00\x00\x00\x00\x00\x01"
|
