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65 lines
1.0 KiB
ArmAsm
65 lines
1.0 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 "c128.inc"
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.importzp tmp1, tmp2
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.code
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; Jan 1st 1970, CIA #1 TOD
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.proc __systime
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lda #70
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sta TM + tm::tm_year
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lda #1
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sta TM + tm::tm_mday
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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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.bss
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TM: .tag tm
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