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timer.asm
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;================================================================================
; Challenge Timer
;================================================================================
!Temp = "$7F5020"
!BaseTimer = "$7EF43E"
!ChallengeTimer = "$7EF454"
;--------------------------------------------------------------------------------
!CLOCK_HOURS = "$7F5080" ; $7F5080 - $7F5083 - Clock Hours
!CLOCK_MINUTES = "$7F5084" ; $7F5084 - $7F5087 - Clock Minutes
!CLOCK_SECONDS = "$7F5088" ; $7F5088 - $7F508B - Clock Seconds
!CLOCK_TEMPORARY = "$7F508C" ; $7F508C - $7F508F - Clock Temporary
;--------------------------------------------------------------------------------
!FRAMES_PER_SECOND = #60
!FRAMES_PER_MINUTE = #60*60
!FRAMES_PER_HOUR = #60*60*60
;--------------------------------------------------------------------------------
!Status = "$7F507E"
; ---- --dn
; d - dnf
; n - negative
;--------------------------------------------------------------------------------
macro DecIncr(value)
LDA.l <value> : INC
CMP.w #$000A : !BLT ?noIncr
LDA.l <value>+2 : INC : STA.l <value>+2
LDA.w #$0000
?noIncr:
STA.l <value>
endmacro
;--------------------------------------------------------------------------------
macro Sub32(minuend,subtrahend,result)
LDA.l <minuend>
!SUB.l <subtrahend> ; perform subtraction on the LSBs
STA.l <result>
LDA.l <minuend>+2 ; do the same for the MSBs, with carry
SBC.l <subtrahend>+2 ; set according to the previous result
STA.l <result>+2
endmacro
;--------------------------------------------------------------------------------
macro Blt32(value1,value2)
LDA.l <value1>+2
CMP.l <value2>+2
!BLT ?done
BNE ?done
LDA.l <value1>
CMP.l <value2>
?done:
endmacro
;--------------------------------------------------------------------------------
CalculateTimer:
LDA $FFFFFF
LDA.w #$0000
STA.l !CLOCK_HOURS ; clear digit storage
STA.l !CLOCK_HOURS+2
STA.l !CLOCK_MINUTES
STA.l !CLOCK_MINUTES+2
STA.l !CLOCK_SECONDS
STA.l !CLOCK_SECONDS+2
LDA.l TimerStyle : AND.w #$00FF : CMP.w #$0002 : BNE + ; Stopwatch Mode
%Sub32(!BaseTimer,!ChallengeTimer,!CLOCK_TEMPORARY)
BRA ++
+ CMP.w #$0001 : BNE ++ ; Countdown Mode
%Sub32(!ChallengeTimer,!BaseTimer,!CLOCK_TEMPORARY)
++
%Blt32(!CLOCK_TEMPORARY,.halfCycle) : !BLT +
LDA.l TimeoutBehavior : AND.w #$00FF : BNE ++ ; DNF
LDA.w #$0002 : STA.l !Status ; Set DNF Mode
LDA.l !BaseTimer : STA.l !ChallengeTimer
LDA.l !BaseTimer+2 : STA.l !ChallengeTimer+2
RTS
++ CMP.w #$0001 : BNE ++ ; Negative Time
LDA.l !CLOCK_TEMPORARY : EOR.w #$FFFF : !ADD.w #$0001 : STA.l !CLOCK_TEMPORARY
LDA.l !CLOCK_TEMPORARY+2 : EOR.w #$FFFF : ADC.w #$0000 : STA.l !CLOCK_TEMPORARY+2
LDA.w #$0001 : STA.l !Status ; Set Negative Mode
BRA .prepDigits
++ ; OHKO
LDA.w #$0002 : STA.l !Status ; Set DNF Mode
LDA.l !BaseTimer : STA.l !ChallengeTimer
LDA.l !BaseTimer+2 : STA.l !ChallengeTimer+2
RTS
+
LDA.l TimerRestart : AND.w #$00FF : BEQ +
LDA.w #$0000 : STA.l !Status ; Set Positive Mode
+
.prepDigits
-
%Blt32(!CLOCK_TEMPORARY,.hour) : !BLT +
%DecIncr(!CLOCK_HOURS)
%Sub32(!CLOCK_TEMPORARY,.hour,!CLOCK_TEMPORARY) : BRA -
+ -
%Blt32(!CLOCK_TEMPORARY,.minute) : !BLT +
%DecIncr(!CLOCK_MINUTES)
%Sub32(!CLOCK_TEMPORARY,.minute,!CLOCK_TEMPORARY) : BRA -
+ -
%Blt32(!CLOCK_TEMPORARY,.second) : !BLT +
%DecIncr(!CLOCK_SECONDS)
%Sub32(!CLOCK_TEMPORARY,.second,!CLOCK_TEMPORARY) : BRA -
+
LDA !CLOCK_HOURS : !ADD.w #$2490 : STA !CLOCK_HOURS ; convert decimal values to tiles
LDA !CLOCK_HOURS+2 : !ADD.w #$2490 : STA !CLOCK_HOURS+2
LDA !CLOCK_MINUTES : !ADD.w #$2490 : STA !CLOCK_MINUTES
LDA !CLOCK_MINUTES+2 : !ADD.w #$2490 : STA !CLOCK_MINUTES+2
LDA !CLOCK_SECONDS : !ADD.w #$2490 : STA !CLOCK_SECONDS
LDA !CLOCK_SECONDS+2 : !ADD.w #$2490 : STA !CLOCK_SECONDS+2
RTS
;--------------------------------------------------------------------------------
.hour
dw #$4BC0, #$0003
.minute
dw #$0E10, #$0000
.second
dw #$003C, #$0000
.halfCycle
dw #$FFFF, #$7FFF
;--------------------------------------------------------------------------------
DrawChallengeTimer:
LDA.l TimerStyle : BNE + : RTL : + ; Hud Timer
LDA.w #$2807 : STA $7EC792
LDA.l !Status : AND.w #$0002 : BEQ + ; DNF / OKHO
LDA.l TimeoutBehavior : AND.w #$00FF : BNE ++ ; DNF
LDA.w #$2808 : STA $7EC794
LDA.w #$2809 : STA $7EC796
LDA.w #$247F : STA $7EC798
STA $7EC79A
BRA +++
++ ; OHKO
LDA.w #$280A : STA $7EC794
LDA.w #$280B : STA $7EC796
LDA.w #$280C : STA $7EC798
LDA.w #$247F : STA $7EC79A
+++
STA $7EC79C
STA $7EC79E
STA $7EC7A0
STA $7EC7A2
STA $7EC7A4
LDA.l TimerRestart : BNE +++ : RTL : +++
BRA ++
+ ; Show Timer
LDA.l !Status : AND.w #$0001 : !ADD.w #$2804 : STA $7EC794
LDA !CLOCK_HOURS+2 : STA $7EC796
LDA !CLOCK_HOURS : STA $7EC798
LDA.w #$2806 : STA $7EC79A
LDA !CLOCK_MINUTES+2 : STA $7EC79C
LDA !CLOCK_MINUTES : STA $7EC79E
LDA.w #$2806 : STA $7EC7A0
LDA !CLOCK_SECONDS+2 : STA $7EC7A2
LDA !CLOCK_SECONDS : STA $7EC7A4
++
LDA $1A : AND.w #$001F : BNE + : JSR CalculateTimer : +
RTL
;--------------------------------------------------------------------------------
OHKOTimer:
LDA.l TimeoutBehavior : CMP #$02 : BNE +
LDA.l !Status : AND.b #$02 : BEQ +
LDA.b #$00 : STA $7EF36D ; kill link
+
LDA $7EF36D
RTL
;--------------------------------------------------------------------------------