mirror of
https://github.com/cc65/cc65.git
synced 2024-11-03 10:07:02 +00:00
99 lines
1.9 KiB
ArmAsm
99 lines
1.9 KiB
ArmAsm
;
|
|
; Stefan Haubenthal, 2009-07-27
|
|
; Ullrich von Bassewitz, 2009-09-24
|
|
;
|
|
; time_t _systime (void);
|
|
; /* Similar to time(), but:
|
|
; * - Is not ISO C
|
|
; * - Does not take the additional pointer
|
|
; * - Does not set errno when returning -1
|
|
; */
|
|
;
|
|
|
|
.include "time.inc"
|
|
.include "cbm510.inc"
|
|
.include "extzp.inc"
|
|
|
|
.import sys_bank, restore_bank
|
|
.importzp tmp1, tmp2
|
|
|
|
|
|
;----------------------------------------------------------------------------
|
|
.code
|
|
|
|
.proc __systime
|
|
|
|
; Switch to the system bank
|
|
|
|
jsr sys_bank
|
|
|
|
; Read the clock
|
|
|
|
ldy #CIA::TODHR
|
|
lda (cia2),y
|
|
bpl AM
|
|
and #%01111111
|
|
sed
|
|
clc
|
|
adc #$12
|
|
cld
|
|
AM: jsr BCD2dec
|
|
sta TM + tm::tm_hour
|
|
ldy #CIA::TODMIN
|
|
lda (cia2),y
|
|
jsr BCD2dec
|
|
sta TM + tm::tm_min
|
|
ldy #CIA::TODSEC
|
|
lda (cia2),y
|
|
jsr BCD2dec
|
|
sta TM + tm::tm_sec
|
|
ldy #CIA::TOD10
|
|
lda (cia2),y ; Dummy read to unfreeze
|
|
|
|
; Restore the bank
|
|
|
|
jsr restore_bank
|
|
|
|
; Convert to a time
|
|
|
|
lda #<TM
|
|
ldx #>TM
|
|
jmp _mktime
|
|
|
|
.endproc
|
|
|
|
;----------------------------------------------------------------------------
|
|
; dec = (((BCD>>4)*10) + (BCD&0xf))
|
|
|
|
.proc BCD2dec
|
|
|
|
tax
|
|
and #%00001111
|
|
sta tmp1
|
|
txa
|
|
and #%11110000 ; *16
|
|
lsr ; *8
|
|
sta tmp2
|
|
lsr
|
|
lsr ; *2
|
|
adc tmp2 ; = *10
|
|
adc tmp1
|
|
rts
|
|
|
|
.endproc
|
|
|
|
;----------------------------------------------------------------------------
|
|
; TM struct with date set to 1970-01-01
|
|
.data
|
|
|
|
TM: .word 0 ; tm_sec
|
|
.word 0 ; tm_min
|
|
.word 0 ; tm_hour
|
|
.word 1 ; tm_mday
|
|
.word 0 ; tm_mon
|
|
.word 70 ; tm_year
|
|
.word 0 ; tm_wday
|
|
.word 0 ; tm_yday
|
|
.word 0 ; tm_isdst
|
|
|