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
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
|
; Functions relating to the timer interrupt and the real-time-clock.
Timer:: ; unreferenced
push af
ldh a, [hMobile]
and a
jr z, .not_mobile
call MobileTimer
.not_mobile
pop af
reti
LatchClock::
; latch clock counter data
ld a, 0
ld [MBC3LatchClock], a
ld a, 1
ld [MBC3LatchClock], a
ret
UpdateTime::
call GetClock
call FixDays
call FixTime
farcall GetTimeOfDay
ret
GetClock::
; store clock data in hRTCDayHi-hRTCSeconds
; enable clock r/w
ld a, SRAM_ENABLE
ld [MBC3SRamEnable], a
; clock data is 'backwards' in hram
call LatchClock
ld hl, MBC3SRamBank
ld de, MBC3RTC
ld [hl], RTC_S
ld a, [de]
maskbits 60
ldh [hRTCSeconds], a
ld [hl], RTC_M
ld a, [de]
maskbits 60
ldh [hRTCMinutes], a
ld [hl], RTC_H
ld a, [de]
maskbits 24
ldh [hRTCHours], a
ld [hl], RTC_DL
ld a, [de]
ldh [hRTCDayLo], a
ld [hl], RTC_DH
ld a, [de]
ldh [hRTCDayHi], a
; unlatch clock / disable clock r/w
call CloseSRAM
ret
FixDays::
; fix day count
; mod by 140
; check if day count > 255 (bit 8 set)
ldh a, [hRTCDayHi] ; DH
bit 0, a
jr z, .daylo
; reset dh (bit 8)
res 0, a
ldh [hRTCDayHi], a
; mod 140
; mod twice since bit 8 (DH) was set
ldh a, [hRTCDayLo]
.modh
sub 140
jr nc, .modh
.modl
sub 140
jr nc, .modl
add 140
; update dl
ldh [hRTCDayLo], a
; flag for sRTCStatusFlags
ld a, %01000000
jr .set
.daylo
; quit if fewer than 140 days have passed
ldh a, [hRTCDayLo]
cp 140
jr c, .quit
; mod 140
.mod
sub 140
jr nc, .mod
add 140
; update dl
ldh [hRTCDayLo], a
; flag for sRTCStatusFlags
ld a, %00100000
.set
; update clock with modded day value
push af
call SetClock
pop af
scf
ret
.quit
xor a
ret
FixTime::
; add ingame time (set at newgame) to current time
; store time in wCurDay, hHours, hMinutes, hSeconds
; second
ldh a, [hRTCSeconds]
ld c, a
ld a, [wStartSecond]
add c
sub 60
jr nc, .updatesec
add 60
.updatesec
ldh [hSeconds], a
; minute
ccf ; carry is set, so turn it off
ldh a, [hRTCMinutes]
ld c, a
ld a, [wStartMinute]
adc c
sub 60
jr nc, .updatemin
add 60
.updatemin
ldh [hMinutes], a
; hour
ccf ; carry is set, so turn it off
ldh a, [hRTCHours]
ld c, a
ld a, [wStartHour]
adc c
sub 24
jr nc, .updatehr
add 24
.updatehr
ldh [hHours], a
; day
ccf ; carry is set, so turn it off
ldh a, [hRTCDayLo]
ld c, a
ld a, [wStartDay]
adc c
ld [wCurDay], a
ret
InitTimeOfDay::
xor a
ld [wStringBuffer2], a
ld a, 0 ; useless
ld [wStringBuffer2 + 3], a
jr InitTime
InitDayOfWeek::
call UpdateTime
ldh a, [hHours]
ld [wStringBuffer2 + 1], a
ldh a, [hMinutes]
ld [wStringBuffer2 + 2], a
ldh a, [hSeconds]
ld [wStringBuffer2 + 3], a
jr InitTime ; useless
InitTime::
farcall _InitTime
ret
ClearClock::
call .ClearhRTC
call SetClock
ret
.ClearhRTC:
xor a
ldh [hRTCSeconds], a
ldh [hRTCMinutes], a
ldh [hRTCHours], a
ldh [hRTCDayLo], a
ldh [hRTCDayHi], a
ret
SetClock::
; set clock data from hram
; enable clock r/w
ld a, SRAM_ENABLE
ld [MBC3SRamEnable], a
; set clock data
; stored 'backwards' in hram
call LatchClock
ld hl, MBC3SRamBank
ld de, MBC3RTC
; seems to be a halt check that got partially commented out
; this block is totally pointless
ld [hl], RTC_DH
ld a, [de]
bit 6, a ; halt
ld [de], a
; seconds
ld [hl], RTC_S
ldh a, [hRTCSeconds]
ld [de], a
; minutes
ld [hl], RTC_M
ldh a, [hRTCMinutes]
ld [de], a
; hours
ld [hl], RTC_H
ldh a, [hRTCHours]
ld [de], a
; day lo
ld [hl], RTC_DL
ldh a, [hRTCDayLo]
ld [de], a
; day hi
ld [hl], RTC_DH
ldh a, [hRTCDayHi]
res 6, a ; make sure timer is active
ld [de], a
; cleanup
call CloseSRAM ; unlatch clock, disable clock r/w
ret
ClearRTCStatus:: ; unreferenced
; clear sRTCStatusFlags
xor a
push af
ld a, BANK(sRTCStatusFlags)
call OpenSRAM
pop af
ld [sRTCStatusFlags], a
call CloseSRAM
ret
RecordRTCStatus::
; append flags to sRTCStatusFlags
ld hl, sRTCStatusFlags
push af
ld a, BANK(sRTCStatusFlags)
call OpenSRAM
pop af
or [hl]
ld [hl], a
call CloseSRAM
ret
CheckRTCStatus::
; check sRTCStatusFlags
ld a, BANK(sRTCStatusFlags)
call OpenSRAM
ld a, [sRTCStatusFlags]
call CloseSRAM
ret
|
