/
time.asm
187 lines (170 loc) · 4.44 KB
/
time.asm
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
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
;===================================================================================================
; Time Functions
;
; Written By: Oded Cnaan (oded.8bit@gmail.com)
; Site: http://odedc.net
; Licence: GPLv3 (see LICENSE file)
; Package: UtilLib
;
; Description:
; Different methods for managing delays
;===================================================================================================
LOCALS @@
DATASEG
MICROSEC_HI equ 0fh ; used for calculating time (Sleep)
MICROSEC_LOW equ 04240h ; used for calculating time (Sleep)
MILLISEC equ 03eBh ; 1,000
CODESEG
;----------------------------------------------------------
; Halt program for a given number of seconds
;
; push num-seconds
; call Sleep
;----------------------------------------------------------
PROC Sleep
store_sp_bp
sub sp, 4
pusha
; now the stack is
; bp-4 => hi
; bp-2 => low
; bp+0 => old base pointer
; bp+2 => return address
; bp+4 => param1 (seconds)
; saved registers
mov ax,MICROSEC_LOW
mul [word bp+4]
mov [word bp-4],dx
mov dx,ax
mov ax, MICROSEC_HI
mul [word bp+4]
add ax,[word bp-4]
mov cx,ax
mov al, 0h
mov ah, 86h
int 15H
popa
restore_sp_bp
ret 2
ENDP Sleep
;------------------------------------------------------------------------
; Creates a short delay
;
; Uses system ticks (about 18/sec) so a delay of '1' is about 1/18
; of a sec
;
; Delay (word msec)
;------------------------------------------------------------------------
PROC Delay
store_sp_bp
pusha
; now the stack is
; bp+0 => old base pointer
; bp+2 => return address
; bp+4 => # msecs
; saved registers
xor ax,ax
int 1Ah
mov bx, dx ; low order word of tick count
mov cx, [word bp+4] ; delay time
@@jmp_delay:
push cx
int 1Ah
sub dx, bx
;there are about 18 ticks in a second, 10 ticks are about enough
pop cx
cmp dx, cx
jl @@jmp_delay
@@end:
popa
restore_sp_bp
ret 2
ENDP Delay
;------------------------------------------------------------------------
; PROC Description:
; Delay execution for given number of microseconds
;
; Notes:
; 1. 1,000,000 microseconds = 1 second. For 2 seconds,
; set CX=001eH and DX=8480H. (1E 8480 = 2,000,000)
; 2. 1 msec = 1000*1 = CX=0 DX=03eBh
; 3. CX must be at least 1000 (03e8H)
;
; Input:
; high order - of number of microseconds
; low order - of number of microseconds
;
; Output:
; None
;
; DelayMS(high, low)
;------------------------------------------------------------------------
PROC DelayMS
store_sp_bp
push ax
push dx
push cx
; now the stack is
; bp+0 => old base pointer
; bp+2 => return address
; bp+4 => low word (DX)
; bp+6 => high word (CX)
; saved registers
mov cx, [word bp+6]
mov dx, [word bp+4]
mov ah, 86h
int 15h
@@end:
pop cx
pop dx
pop ax
restore_sp_bp
ret 4
ENDP DelayMS
;////////////////////////////////////////////////////////////////////////////
; FUNCTION LIKE MACROS
;////////////////////////////////////////////////////////////////////////////
;------------------------------------------------------------------------
; Halt program for a given number of seconds
;
; grm_Sleep (seconds)
;------------------------------------------------------------------------
MACRO utm_Sleep seconds
push seconds
call Sleep
ENDM
;------------------------------------------------------------------------
; Creates a short delay
;
; Uses system ticks (about 18/sec) so a delay of '1' is about 1/18
; of a sec
;
; grm_Delay (clicks)
;------------------------------------------------------------------------
MACRO utm_Delay clicks
push clicks
call Delay
ENDM
;------------------------------------------------------------------------
; Delay execution for given number of microseconds
;
; Notes:
; 1. 1,000,000 microseconds = 1 second. For 2 seconds,
; set CX=001eH and DX=8480H. (1E 8480 = 2,000,000)
; 2. 1 msec = 1000*1 = CX=0 DX=03eBh
; 3. CX must be at least 1000 (03e8H)
;
; Input:
; high order - of number of microseconds
; low order - of number of microseconds
;
; Output:
; None
;
; grm_DelayMS (high, low)
;------------------------------------------------------------------------
MACRO utm_DelayMS highOrder, lowOrder
push highOrder
push lowOrder
call Delay
ENDM