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Split clock file to components

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This commit is contained in:
Karri Kaksonen 2022-03-22 21:29:06 +02:00
parent d0d0941a64
commit 865be55e66
2 changed files with 35 additions and 21 deletions
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22
libsrc/atari7800/clock.s
View File

@ -2,16 +2,14 @@
; 2022-03-15, Karri Kaksonen
;
; clock_t clock (void);
; clock_t _clocks_per_sec (void);
;
.export _clock, __clocks_per_sec, clock_count
.export _clock, clock_count
.interruptor update_clock, 2 ; (low priority)
.constructor init_clock
.import sreg: zp
.import _zonecounter
.import _paldetected
.include "atari7800.inc"
.macpack generic
@ -33,24 +31,6 @@
rts
.endproc
;-----------------------------------------------------------------------------
; Return the number of clock ticks in one second.
;
.proc __clocks_per_sec
lda #0
tax
sta sreg ; return 32 bits
sta sreg+1
lda _paldetected
bne pal
lda #60 ; NTSC - 60Hz
rts
pal:
lda #50 ; PAL - 50Hz
rts
.endproc
;-----------------------------------------------------------------------------
; This interrupt handler increments a 24-bit counter at every video
; vertical-blanking time.

34
libsrc/atari7800/clocks_per_sec.s Normal file
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@ -0,0 +1,34 @@
;
; 2022-03-15, Karri Kaksonen
;
; clock_t _clocks_per_sec (void);
;
.export __clocks_per_sec
.import sreg: zp
.import _paldetected
.include "atari7800.inc"
.macpack generic
.code
;-----------------------------------------------------------------------------
; Return the number of clock ticks in one second.
;
.proc __clocks_per_sec
lda #0
tax
sta sreg ; return 32 bits
sta sreg+1
lda _paldetected
bne pal
lda #60 ; NTSC - 60Hz
rts
pal:
lda #50 ; PAL - 50Hz
rts
.endproc