blob: 444a6cfa14b8676d0254773e8add2441d8c1e857 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
|
%ifndef _KEYBOARD_ASM
%define _KEYBOARD_ASM
; REFERENCE(s):
; http://stanislavs.org/helppc/int_16-3.html
kbd_read:
mov ah, 00h ; BIOS - read key (blocking)
int 16h ; BIOS keyboard service
mov [kbd_last_key], ax ; Record keypress
; ah = scancode
; al = ascii code
ret
kbd_read_async:
mov ah, 01h ; BIOS - read key (non-blocking)
int 16h ; BIOS keyboard service
mov [kbd_last_key], ax ; Record keypress
; ah = scancode
; al = ascii code
ret
kbd_status_shift:
mov ah, 02h ; BIOS - keyboard status
; al = flags
;
; bit fields:
; 7 = insert active
; 6 = caps-lock active
; 5 = num-lock active
; 4 = scroll-lock active
; 3 = ALT depresssed
; 2 = CTRL depressed
; 1 = left shift depressed
; 0 = right shift depressed
mov [kbd_status_flags], byte al
int 16h ; BIOS keyboard service
ret
kbd_set_rate:
push bp
mov bp, sp
mov ah, 03h ; BIOS - keyboard service rate/delay
mov al, 05h ; CONTROL
; 00 - set typematic rate
; 01 - increase delay
; 02 - decrease rate by 0.5
; 04 - disable typematic characters
; 05 - set typematic rate & delay (used here)
mov bh, byte [bp + 4] ; REPEAT (per second)
; 00 - 30.0 01 - 26.7 02 - 24.0 03 - 21.8
; 04 - 20.0 05 - 18.5 06 - 17.1 07 - 16.0
; 08 - 15.0 09 - 13.3 0A - 12.0 0B - 10.9
; 0C - 10.0 0D - 9.2 0E - 8.6 0F - 8.0
; 10 - 7.5 11 - 6.7 12 - 6.0 13 - 5.5
; 14 - 5.0 15 - 4.6 16 - 4.3 17 - 4.0
; 18 - 3.7 19 - 3.3 1A - 3.0 1B - 2.7
; 1C - 2.5 1D - 2.3 1E - 2.1 1F - 2.0
mov bl, byte [bp + 6] ; DELAY
; 00 - 250ms
; 01 - 500ms
; 02 - 750ms
; 03 - 1000ms
int 16h ; BIOS keyboard service
mov sp, bp
pop bp
ret
; data
kbd_last_key: dw 0
kbd_status_flags: db 0
%endif
|
