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98 lines
2.1 KiB
ArmAsm
98 lines
2.1 KiB
ArmAsm
;
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; 2018-08-18, Oliver Schmidt
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; 2018-08-19, Greg King
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;
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; int clock_settime (clockid_t clk_id, const struct timespec *tp);
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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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.importzp sreg, ptr1
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.import pushax, pusheax, ldax0sp, ldeaxidx
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.import sys_bank, restore_bank
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.import tosdiveax, incsp3, return0
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.import TM, load_tenth
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;----------------------------------------------------------------------------
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.code
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.proc _clock_settime
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jsr pushax
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.assert timespec::tv_sec = 0, error
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jsr _localtime
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sta ptr1
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stx ptr1+1
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ldy #.sizeof(tm)-1
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@L1: lda (ptr1),y
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sta TM,y
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dey
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bpl @L1
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jsr sys_bank
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lda TM + tm::tm_hour
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jsr dec2BCD
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tax ; Force flags
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bne @L2
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lda #$92 ; 12 AM
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bne @L3
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@L2: cmp #$13 ; 1 PM
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bcc @L3
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sed
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sbc #$12
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cld
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ora #%10000000
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@L3: ldy #CIA::TODHR
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sta (cia),y
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lda TM + tm::tm_min
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jsr dec2BCD
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ldy #CIA::TODMIN
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sta (cia),y
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lda TM + tm::tm_sec
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jsr dec2BCD
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ldy #CIA::TODSEC
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sta (cia),y
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jsr restore_bank
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jsr ldax0sp
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ldy #3+timespec::tv_nsec
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jsr ldeaxidx
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jsr pusheax
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jsr load_tenth
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jsr tosdiveax
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jsr sys_bank
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ldy #CIA::TOD10
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sta (cia),y
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jsr restore_bank
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lda #$00
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tax
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jmp incsp3
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.endproc
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;----------------------------------------------------------------------------
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; Just sum up the value in BCD mode.
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; http://forum.6502.org/viewtopic.php?p=7629#p7629
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.proc dec2BCD
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tax
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dex
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bmi @L9
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lda #0
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clc
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sed
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@L1: adc #1
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dex
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bpl @L1
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cld
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@L9: rts
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.endproc
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