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Midnight is 12 AM and noon is 12 PM (see https://en.wikipedia.org/wiki/12-hour_clock). Therefore we need to subtract 12 hours in exactly those two hours.
128 lines
3.2 KiB
ArmAsm
128 lines
3.2 KiB
ArmAsm
;
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; Stefan Haubenthal, 27.7.2009
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; Oliver Schmidt, 14.8.2018
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;
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; int clock_gettime (clockid_t clk_id, struct timespec *tp);
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;
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.include "time.inc"
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.include "c64.inc"
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.include "get_tv.inc"
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.constructor inittime
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.importzp sreg, tmp1, tmp2
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.import pushax, pusheax, tosmul0ax, steaxspidx, incsp1, return0
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.import _get_tv, _get_ostype
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;----------------------------------------------------------------------------
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.code
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.proc _clock_gettime
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jsr pushax
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jsr pushax
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lda CIA1_TODHR
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sed
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tax ; Save PM flag
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and #%01111111
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cmp #$12 ; 12 AM/PM
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bcc @L1
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sbc #$12
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@L1: inx ; Get PM flag
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bpl @L2
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clc
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adc #$12
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@L2: cld
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jsr BCD2dec
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sta TM + tm::tm_hour
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lda CIA1_TODMIN
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jsr BCD2dec
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sta TM + tm::tm_min
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lda CIA1_TODSEC
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jsr BCD2dec
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sta TM + tm::tm_sec
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lda #<TM
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ldx #>TM
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jsr _mktime
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ldy #timespec::tv_sec
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jsr steaxspidx ; Pops address pushed by 2. pushax
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lda #<(100 * 1000 * 1000 / $10000)
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ldx #>(100 * 1000 * 1000 / $10000)
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sta sreg
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stx sreg+1
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lda #<(100 * 1000 * 1000)
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ldx #>(100 * 1000 * 1000)
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jsr pusheax
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lda CIA1_TOD10
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ldx #>$0000
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jsr tosmul0ax
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ldy #timespec::tv_nsec
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jsr steaxspidx ; Pops address pushed by 1. pushax
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jsr incsp1
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jmp return0
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.endproc
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;----------------------------------------------------------------------------
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; dec = (((BCD>>4)*10) + (BCD&0xf))
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.proc BCD2dec
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tax
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and #%00001111
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sta tmp1
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txa
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and #%11110000 ; *16
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lsr ; *8
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sta tmp2
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lsr
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lsr ; *2
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adc tmp2 ; = *10
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adc tmp1
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rts
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.endproc
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;----------------------------------------------------------------------------
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; Constructor that writes to the 1/10 sec register of the TOD to kick it
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; into action. If this is not done, the clock hangs. We will read the register
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; and write it again, ignoring a possible change in between.
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.segment "ONCE"
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.proc inittime
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lda CIA1_TOD10
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sta CIA1_TOD10
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jsr _get_tv
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cmp #TV::PAL
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bne @60Hz
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jsr _get_ostype
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cmp #$43
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beq @60Hz
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lda CIA1_CRA
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ora #$80
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sta CIA1_CRA
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@60Hz: rts
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.endproc
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;----------------------------------------------------------------------------
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; TM struct with date set to 1970-01-01
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.data
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TM: .word 0 ; tm_sec
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.word 0 ; tm_min
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.word 0 ; tm_hour
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.word 1 ; tm_mday
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.word 0 ; tm_mon
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.word 70 ; tm_year
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.word 0 ; tm_wday
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.word 0 ; tm_yday
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.word 0 ; tm_isdst
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