fox32rom/monitor/keyboard.asm

100 lines
2.7 KiB
NASM
Raw Normal View History

; debug monitor keyboard routines
; convert a make scancode to an ASCII character
; inputs:
; r0: make scancode
; outputs:
; r0: ASCII character
scancode_to_ascii:
2022-04-24 00:01:47 +02:00
push r1
mov r1, scancode_table
bts [MODIFIER_BITMAP], 0
ifnz mov r1, scancode_table_shift
bts [MODIFIER_BITMAP], 1
ifnz mov r1, scancode_table_caps
add r0, r1
movz.8 r0, [r0]
2022-04-24 00:01:47 +02:00
pop r1
ret
; set bit 0 in the modifier bitmap
; inputs:
; none
; outputs:
; none
shift_pressed:
bse [MODIFIER_BITMAP], 0
ret
; clear bit 0 in the modifier bitmap
; inputs:
; none
; outputs:
; none
shift_released:
bcl [MODIFIER_BITMAP], 0
ret
; toggle bit 1 in the modifier bitmap
; inputs:
; none
; outputs:
; none
caps_pressed:
bts [MODIFIER_BITMAP], 1
ifz bse [MODIFIER_BITMAP], 1
ifnz bcl [MODIFIER_BITMAP], 1
ret
; scancode set 1:
; https://wiki.osdev.org/PS/2_Keyboard#Scan_Code_Set_1
2022-04-24 00:01:47 +02:00
const LSHIFT: 0x2A
const RSHIFT: 0x36
const CAPS: 0x3A
scancode_table:
data.8 0 data.8 27 data.str "1234567890-=" data.8 8
data.8 9 data.str "qwertyuiop[]" data.8 10 data.8 0
data.str "asdfghjkl;'`" data.8 0 data.8 92
data.str "zxcvbnm,./" data.8 0 data.str "*" data.8 0 data.str " "
data.8 0 data.8 0 data.8 0 data.8 0
data.8 0 data.8 0 data.8 0 data.8 0
data.8 0 data.8 0 data.8 0 data.8 0
data.8 0 data.8 0 data.8 0 data.8 0
data.str "-" data.8 0 data.8 0 data.8 0 data.str "+"
data.8 0 data.8 0 data.8 0 data.8 0
data.8 0 data.8 0 data.8 0 data.8 0
data.8 0 data.8 0 data.8 0
scancode_table_shift:
data.8 0 data.8 27 data.str "!@#$%^&*()_+" data.8 8
data.8 9 data.str "QWERTYUIOP{}" data.8 10 data.8 0
data.str "ASDFGHJKL:" data.8 34 data.str "~" data.8 0 data.str "|"
data.str "ZXCVBNM<>?" data.8 0 data.str "*" data.8 0 data.str " "
data.8 0 data.8 0 data.8 0 data.8 0
data.8 0 data.8 0 data.8 0 data.8 0
data.8 0 data.8 0 data.8 0 data.8 0
data.8 0 data.8 0 data.8 0 data.8 0
data.str "-" data.8 0 data.8 0 data.8 0 data.str "+"
data.8 0 data.8 0 data.8 0 data.8 0
data.8 0 data.8 0 data.8 0 data.8 0
data.8 0 data.8 0 data.8 0
scancode_table_caps:
data.8 0 data.8 27 data.str "1234567890-=" data.8 8
data.8 9 data.str "QWERTYUIOP[]" data.8 10 data.8 0
data.str "ASDFGHJKL;'`" data.8 0 data.8 92
data.str "ZXCVBNM,./" data.8 0 data.str "*" data.8 0 data.str " "
data.8 0 data.8 0 data.8 0 data.8 0
data.8 0 data.8 0 data.8 0 data.8 0
data.8 0 data.8 0 data.8 0 data.8 0
data.8 0 data.8 0 data.8 0 data.8 0
data.str "-" data.8 0 data.8 0 data.8 0 data.str "+"
data.8 0 data.8 0 data.8 0 data.8 0
data.8 0 data.8 0 data.8 0 data.8 0
data.8 0 data.8 0 data.8 0
2022-04-24 00:01:47 +02:00
const MODIFIER_BITMAP: 0x03ED36C9 ; 1 byte