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99 lines
2.2 KiB
ArmAsm
99 lines
2.2 KiB
ArmAsm
;
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; Stefan Haubenthal, 2009-07-27
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; Ullrich von Bassewitz, 2009-09-24
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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 "cbm610.inc"
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.include "extzp.inc"
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.import sys_bank, restore_bank
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.importzp tmp1, tmp2
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;----------------------------------------------------------------------------
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.code
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.proc __systime
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; Switch to the system bank
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jsr sys_bank
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; Read the clock
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ldy #CIA::TODHR
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lda (cia),y
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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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ldy #CIA::TODMIN
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lda (cia),y
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jsr BCD2dec
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sta TM + tm::tm_min
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ldy #CIA::TODSEC
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lda (cia),y
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jsr BCD2dec
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sta TM + tm::tm_sec
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ldy #CIA::TOD10
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lda (cia),y ; Dummy read to unfreeze
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; Restore the bank
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jsr restore_bank
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; Convert to a time
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lda #<TM
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ldx #>TM
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jmp _mktime
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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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; 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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