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99 lines
2.4 KiB
ArmAsm
99 lines
2.4 KiB
ArmAsm
;
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; Stefan Haubenthal, 27.7.2009
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;
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; time_t _systime (void);
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; /* Similar to time(), but:
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; ** - Is not ISO C
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; ** - Does not take the additional pointer
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; ** - Does not set errno when returning -1
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; */
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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 initsystime
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.importzp tmp1, tmp2
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.import _get_tv, _get_ostype
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;----------------------------------------------------------------------------
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.code
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.proc __systime
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lda CIA1_TODHR
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bpl AM
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and #%01111111
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sed
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clc
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adc #$12
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cld
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AM: 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 CIA1_TOD10 ; Dummy read to unfreeze
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lda #<TM
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ldx #>TM
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jmp _mktime
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; dec = (((BCD>>4)*10) + (BCD&0xf))
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BCD2dec: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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.proc initsystime
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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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