mirror of https://github.com/pret/pokecrystal.git
310 lines
4.0 KiB
NASM
310 lines
4.0 KiB
NASM
; Functions relating to the timer interrupt and the real-time-clock.
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AskTimer:: ; 591
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push af
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ld a, [$ffe9]
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and a
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jr z, .asm_59a
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call Timer
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.asm_59a
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pop af
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reti
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; 59c
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LatchClock:: ; 59c
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; latch clock counter data
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ld a, 0
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ld [MBC3LatchClock], a
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ld a, 1
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ld [MBC3LatchClock], a
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ret
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; 5a7
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UpdateTime:: ; 5a7
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call GetClock
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call FixDays
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call FixTime
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callba GetTimeOfDay
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ret
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; 5b7
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GetClock:: ; 5b7
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; store clock data in hRTCDayHi-hRTCSeconds
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; enable clock r/w
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ld a, SRAM_ENABLE
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ld [MBC3SRamEnable], a
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; clock data is 'backwards' in hram
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call LatchClock
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ld hl, MBC3SRamBank
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ld de, MBC3RTC
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ld [hl], RTC_S
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ld a, [de]
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and $3f
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ld [hRTCSeconds], a
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ld [hl], RTC_M
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ld a, [de]
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and $3f
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ld [hRTCMinutes], a
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ld [hl], RTC_H
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ld a, [de]
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and $1f
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ld [hRTCHours], a
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ld [hl], RTC_DL
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ld a, [de]
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ld [hRTCDayLo], a
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ld [hl], RTC_DH
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ld a, [de]
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ld [hRTCDayHi], a
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; unlatch clock / disable clock r/w
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call CloseSRAM
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ret
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; 5e8
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FixDays:: ; 5e8
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; fix day count
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; mod by 140
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; check if day count > 255 (bit 8 set)
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ld a, [hRTCDayHi] ; DH
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bit 0, a
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jr z, .daylo
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; reset dh (bit 8)
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res 0, a
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ld [hRTCDayHi], a ; DH
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; mod 140
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; mod twice since bit 8 (DH) was set
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ld a, [hRTCDayLo] ; DL
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.modh
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sub 140
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jr nc, .modh
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.modl
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sub 140
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jr nc, .modl
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add 140
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; update dl
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ld [hRTCDayLo], a ; DL
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; unknown output
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ld a, $40 ; %1000000
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jr .set
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.daylo
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; quit if fewer than 140 days have passed
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ld a, [hRTCDayLo] ; DL
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cp 140
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jr c, .quit
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; mod 140
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.mod
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sub 140
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jr nc, .mod
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add 140
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; update dl
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ld [hRTCDayLo], a ; DL
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; unknown output
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ld a, $20 ; %100000
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.set
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; update clock with modded day value
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push af
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call SetClock
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pop af
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scf
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ret
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.quit
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xor a
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ret
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; 61d
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FixTime:: ; 61d
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; add ingame time (set at newgame) to current time
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; day hr min sec
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; store time in CurDay, hHours, hMinutes, hSeconds
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; second
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ld a, [hRTCSeconds] ; S
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ld c, a
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ld a, [StartSecond]
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add c
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sub 60
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jr nc, .updatesec
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add 60
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.updatesec
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ld [hSeconds], a
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; minute
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ccf ; carry is set, so turn it off
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ld a, [hRTCMinutes] ; M
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ld c, a
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ld a, [StartMinute]
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adc c
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sub 60
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jr nc, .updatemin
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add 60
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.updatemin
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ld [hMinutes], a
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; hour
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ccf ; carry is set, so turn it off
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ld a, [hRTCHours] ; H
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ld c, a
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ld a, [StartHour]
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adc c
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sub 24
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jr nc, .updatehr
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add 24
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.updatehr
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ld [hHours], a
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; day
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ccf ; carry is set, so turn it off
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ld a, [hRTCDayLo] ; DL
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ld c, a
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ld a, [StartDay]
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adc c
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ld [CurDay], a
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ret
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; 658
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Function658:: ; 658
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xor a
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ld [StringBuffer2], a
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ld a, $0
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ld [StringBuffer2 + 3], a
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jr Function677
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Function663:: ; 663
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call UpdateTime
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ld a, [hHours]
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ld [StringBuffer2 + 1], a
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ld a, [hMinutes]
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ld [StringBuffer2 + 2], a
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ld a, [hSeconds]
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ld [StringBuffer2 + 3], a
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jr Function677
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Function677:: ; 677
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callba Function140ed
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ret
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; 67e
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Function67e:: ; 67e
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call Function685
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call SetClock
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ret
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; 685
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Function685:: ; 685
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xor a
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ld [hRTCSeconds], a
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ld [hRTCMinutes], a
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ld [hRTCHours], a
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ld [hRTCDayLo], a
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ld [hRTCDayHi], a
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ret
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; 691
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SetClock:: ; 691
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; set clock data from hram
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; enable clock r/w
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ld a, SRAM_ENABLE
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ld [MBC3SRamEnable], a
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; set clock data
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; stored 'backwards' in hram
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call LatchClock
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ld hl, MBC3SRamBank
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ld de, MBC3RTC
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; seems to be a halt check that got partially commented out
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; this block is totally pointless
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ld [hl], RTC_DH
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ld a, [de]
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bit 6, a ; halt
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ld [de], a
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; seconds
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ld [hl], RTC_S
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ld a, [hRTCSeconds]
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ld [de], a
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; minutes
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ld [hl], RTC_M
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ld a, [hRTCMinutes]
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ld [de], a
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; hours
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ld [hl], RTC_H
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ld a, [hRTCHours]
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ld [de], a
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; day lo
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ld [hl], RTC_DL
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ld a, [hRTCDayLo]
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ld [de], a
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; day hi
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ld [hl], RTC_DH
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ld a, [hRTCDayHi]
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res 6, a ; make sure timer is active
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ld [de], a
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; cleanup
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call CloseSRAM ; unlatch clock, disable clock r/w
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ret
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; 6c4
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Function6c4:: ; 6c4
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xor a
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push af
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ld a, BANK(s0_ac60)
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call GetSRAMBank
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pop af
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ld [s0_ac60], a
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call CloseSRAM
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ret
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; 6d3
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Function6d3:: ; 6d3
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ld hl, s0_ac60
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push af
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ld a, BANK(s0_ac60)
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call GetSRAMBank
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pop af
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or [hl]
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ld [hl], a
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call CloseSRAM
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ret
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; 6e3
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Function6e3:: ; 6e3
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ld a, BANK(s0_ac60)
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call GetSRAMBank
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ld a, [s0_ac60]
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call CloseSRAM
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ret
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; 6ef
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