mirror of
https://github.com/cc65/cc65.git
synced 2024-06-01 13:41:34 +00:00
eb9872c684
The CIA TOD only stores the time but not the date. Therefore the date set by clock_settime() ist just stored inside the C library for retrieval via clock_gettime(). The "very special" handling of 12AM/PM is based on https://groups.google.com/d/msg/comp.sys.cbm/ysVYSX4AMbc/vHrXCWEhCOUJ saying: ========== 24hr: Wr => Rd => Nx -------------------- 0 : 92 => 12 => 01 <= Switch from 00 to 01 (24-hour notation) 1 : 01 => 01 => 02 2 : 02 => 02 => 03 11 : 11 => 11 => 92 12 : 12 => 92 => 81 <= Switch from 12 to 13 (24-hour notation) 13 : 81 => 81 => 82 14 : 82 => 82 => 83 23 : 91 => 91 => 12 1. column ("24hr"): hour to be tested (decimal) 2. column ("Wr"): hour written to TOD register (BCD) 3. column ("Rd"): hour read from TOD register (BCD) immediately after writing the value in column 2 to see the conversion between AM/PM, if any 4. column ("Nx"): next hour (BCD) after the hour switch ========== Thanks Paul!
94 lines
2.0 KiB
ArmAsm
94 lines
2.0 KiB
ArmAsm
;
|
|
; Oliver Schmidt, 16.8.2018
|
|
;
|
|
; int clock_settime (clockid_t clk_id, const struct timespec *tp);
|
|
;
|
|
|
|
.include "time.inc"
|
|
.include "cbm510.inc"
|
|
.include "extzp.inc"
|
|
|
|
.importzp sreg, ptr1
|
|
.import pushax, pusheax, ldax0sp, ldeaxidx
|
|
.import sys_bank, restore_bank
|
|
.import tosdiveax, incsp3, return0
|
|
.import TM, load_tenth
|
|
|
|
|
|
;----------------------------------------------------------------------------
|
|
.code
|
|
|
|
.proc _clock_settime
|
|
|
|
jsr sys_bank
|
|
jsr pushax
|
|
|
|
jsr _localtime
|
|
sta ptr1
|
|
stx ptr1+1
|
|
ldy #.sizeof(tm)-1
|
|
@L1: lda (ptr1),y
|
|
sta TM,y
|
|
dey
|
|
bpl @L1
|
|
|
|
lda TM + tm::tm_hour
|
|
jsr dec2BCD
|
|
tax ; Force flags
|
|
bne @L2
|
|
lda #$92 ; 12 AM
|
|
bne @L3
|
|
@L2: cmp #$13 ; 1 PM
|
|
bcc @L3
|
|
sed
|
|
sbc #$12
|
|
cld
|
|
ora #%10000000
|
|
@L3: ldy #CIA::TODHR
|
|
sta (cia2),y
|
|
lda TM + tm::tm_min
|
|
jsr dec2BCD
|
|
ldy #CIA::TODMIN
|
|
sta (cia2),y
|
|
lda TM + tm::tm_sec
|
|
jsr dec2BCD
|
|
ldy #CIA::TODSEC
|
|
sta (cia2),y
|
|
|
|
jsr ldax0sp
|
|
ldy #3+timespec::tv_nsec
|
|
jsr ldeaxidx
|
|
jsr pusheax
|
|
jsr load_tenth
|
|
jsr tosdiveax
|
|
ldy #CIA::TOD10
|
|
sta (cia2),y
|
|
|
|
jsr incsp3
|
|
|
|
lda #0
|
|
tax
|
|
jmp restore_bank
|
|
|
|
.endproc
|
|
|
|
;----------------------------------------------------------------------------
|
|
; Just sum up the value in BCD mode.
|
|
; http://forum.6502.org/viewtopic.php?p=7629#p7629
|
|
|
|
.proc dec2BCD
|
|
|
|
tax
|
|
dex
|
|
bmi @L9
|
|
lda #0
|
|
clc
|
|
sed
|
|
@L1: adc #1
|
|
dex
|
|
bpl @L1
|
|
cld
|
|
@L9: rts
|
|
|
|
.endproc
|