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; Functions relating to the timer interrupt and the real-time-clock.
AskTimer:: ; 591
push af
ld a, [$ffe9]
and a
jr z, .asm_59a
call Timer
.asm_59a
pop af
reti
; 59c
LatchClock:: ; 59c
; latch clock counter data
ld a, 0
ld [MBC3LatchClock], a
ld a, 1
ld [MBC3LatchClock], a
ret
; 5a7
UpdateTime:: ; 5a7
call GetClock
call FixDays
call FixTime
callba GetTimeOfDay
ret
; 5b7
GetClock:: ; 5b7
; 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]
and $3f
ld [hRTCSeconds], a
ld [hl], RTC_M
ld a, [de]
and $3f
ld [hRTCMinutes], a
ld [hl], RTC_H
ld a, [de]
and $1f
ld [hRTCHours], a
ld [hl], RTC_DL
ld a, [de]
ld [hRTCDayLo], a
ld [hl], RTC_DH
ld a, [de]
ld [hRTCDayHi], a
; unlatch clock / disable clock r/w
call CloseSRAM
ret
; 5e8
FixDays:: ; 5e8
; fix day count
; mod by 140
; check if day count > 255 (bit 8 set)
ld a, [hRTCDayHi] ; DH
bit 0, a
jr z, .daylo
; reset dh (bit 8)
res 0, a
ld [hRTCDayHi], a ; DH
; mod 140
; mod twice since bit 8 (DH) was set
ld a, [hRTCDayLo] ; DL
.modh
sub 140
jr nc, .modh
.modl
sub 140
jr nc, .modl
add 140
; update dl
ld [hRTCDayLo], a ; DL
; unknown output
ld a, $40 ; %1000000
jr .set
.daylo
; quit if fewer than 140 days have passed
ld a, [hRTCDayLo] ; DL
cp 140
jr c, .quit
; mod 140
.mod
sub 140
jr nc, .mod
add 140
; update dl
ld [hRTCDayLo], a ; DL
; unknown output
ld a, $20 ; %100000
.set
; update clock with modded day value
push af
call SetClock
pop af
scf
ret
.quit
xor a
ret
; 61d
FixTime:: ; 61d
; add ingame time (set at newgame) to current time
; day hr min sec
; store time in CurDay, hHours, hMinutes, hSeconds
; second
ld a, [hRTCSeconds] ; S
ld c, a
ld a, [StartSecond]
add c
sub 60
jr nc, .updatesec
add 60
.updatesec
ld [hSeconds], a
; minute
ccf ; carry is set, so turn it off
ld a, [hRTCMinutes] ; M
ld c, a
ld a, [StartMinute]
adc c
sub 60
jr nc, .updatemin
add 60
.updatemin
ld [hMinutes], a
; hour
ccf ; carry is set, so turn it off
ld a, [hRTCHours] ; H
ld c, a
ld a, [StartHour]
adc c
sub 24
jr nc, .updatehr
add 24
.updatehr
ld [hHours], a
; day
ccf ; carry is set, so turn it off
ld a, [hRTCDayLo] ; DL
ld c, a
ld a, [StartDay]
adc c
ld [CurDay], a
ret
; 658
Function658:: ; 658
xor a
ld [StringBuffer2], a
ld a, $0
ld [$d089], a
jr Function677
Function663:: ; 663
call UpdateTime
ld a, [hHours]
ld [$d087], a
ld a, [hMinutes]
ld [$d088], a
ld a, [hSeconds]
ld [$d089], a
jr Function677
Function677:: ; 677
callba Function140ed
ret
; 67e
Function67e:: ; 67e
call Function685
call SetClock
ret
; 685
Function685:: ; 685
xor a
ld [hRTCSeconds], a
ld [hRTCMinutes], a
ld [hRTCHours], a
ld [hRTCDayLo], a
ld [hRTCDayHi], a
ret
; 691
SetClock:: ; 691
; 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
ld a, [hRTCSeconds]
ld [de], a
; minutes
ld [hl], RTC_M
ld a, [hRTCMinutes]
ld [de], a
; hours
ld [hl], RTC_H
ld a, [hRTCHours]
ld [de], a
; day lo
ld [hl], RTC_DL
ld a, [hRTCDayLo]
ld [de], a
; day hi
ld [hl], RTC_DH
ld a, [hRTCDayHi]
res 6, a ; make sure timer is active
ld [de], a
; cleanup
call CloseSRAM ; unlatch clock, disable clock r/w
ret
; 6c4
Function6c4:: ; 6c4
xor a
push af
ld a, $0
call GetSRAMBank
pop af
ld [$ac60], a
call CloseSRAM
ret
; 6d3
Function6d3:: ; 6d3
ld hl, $ac60
push af
ld a, $0
call GetSRAMBank
pop af
or [hl]
ld [hl], a
call CloseSRAM
ret
; 6e3
Function6e3:: ; 6e3
ld a, $0
call GetSRAMBank
ld a, [$ac60]
call CloseSRAM
ret
; 6ef
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