ref: 40766b9a76582c6472959e6ff99ba088b150baca
dir: /home/time.asm/
; Functions relating to the timer interrupt and the real-time-clock. AskTimer:: push af ldh a, [hMobile] and a jr z, .not_mobile call Timer .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 ; DH ; mod 140 ; mod twice since bit 8 (DH) was set ldh a, [hRTCDayLo] ; DL .modh sub 140 jr nc, .modh .modl sub 140 jr nc, .modl add 140 ; update dl ldh [hRTCDayLo], a ; DL ; flag for sRTCStatusFlags ld a, %01000000 jr .set .daylo ; quit if fewer than 140 days have passed ldh a, [hRTCDayLo] ; DL cp 140 jr c, .quit ; mod 140 .mod sub 140 jr nc, .mod add 140 ; update dl ldh [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 FixTime:: ; add ingame time (set at newgame) to current time ; day hr min sec ; store time in wCurDay, hHours, hMinutes, hSeconds ; second ldh a, [hRTCSeconds] ; S 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] ; M 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] ; H 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] ; DL 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 PanicResetClock:: 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:: ; clear sRTCStatusFlags xor a push af ld a, BANK(sRTCStatusFlags) call GetSRAMBank pop af ld [sRTCStatusFlags], a call CloseSRAM ret RecordRTCStatus:: ; 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 CheckRTCStatus:: ; check sRTCStatusFlags ld a, BANK(sRTCStatusFlags) call GetSRAMBank ld a, [sRTCStatusFlags] call CloseSRAM ret