pokecrystal-board/home/time.asm

289 lines
4.0 KiB
NASM

; 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