ref: 08891da82254aa4051bf594d4abc2db8e4043d8f
dir: /home/time.asm/
; Functions relating to the timer interrupt and the real-time-clock. AskTimer:: ; 591 push af ld a, [hMobile] and a jr z, .not_mobile call Timer .not_mobile 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 farcall 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] maskbits 60 ld [hRTCSeconds], a ld [hl], RTC_M ld a, [de] maskbits 60 ld [hRTCMinutes], a ld [hl], RTC_H ld a, [de] maskbits 24 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 ; flag for sRTCStatusFlags ld a, %01000000 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 ; 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 ; 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 InitTimeOfDay:: ; 658 xor a ld [StringBuffer2], a ld a, $0 ; useless ld [StringBuffer2 + 3], a jr InitTime InitDayOfWeek:: ; 663 call UpdateTime ld a, [hHours] ld [StringBuffer2 + 1], a ld a, [hMinutes] ld [StringBuffer2 + 2], a ld a, [hSeconds] ld [StringBuffer2 + 3], a jr InitTime ; useless InitTime:: ; 677 farcall _InitTime ret ; 67e PanicResetClock:: ; 67e call .ClearhRTC call SetClock ret ; 685 .ClearhRTC: ; 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 ClearRTCStatus:: ; 6c4 ; clear sRTCStatusFlags xor a push af ld a, BANK(sRTCStatusFlags) call GetSRAMBank pop af ld [sRTCStatusFlags], a call CloseSRAM ret ; 6d3 RecordRTCStatus:: ; 6d3 ; append flags to sRTCStatusFlags ld hl, sRTCStatusFlags push af ld a, BANK(sRTCStatusFlags) call GetSRAMBank pop af or [hl] ld [hl], a call CloseSRAM ret ; 6e3 CheckRTCStatus:: ; 6e3 ; check sRTCStatusFlags ld a, BANK(sRTCStatusFlags) call GetSRAMBank ld a, [sRTCStatusFlags] call CloseSRAM ret ; 6ef