42 lines
1.4 KiB
Plaintext
42 lines
1.4 KiB
Plaintext
|
.ifndef INCLUDE_SLEEP
|
|||
|
|
INCLUDE_SLEEP = 1
|
|||
|
|
;********************************************************************************
|
|||
|
|
; @macro Sleep
|
|||
|
|
; @param time_cs: Time to sleep in centiseconds (10^-2s = 10ms)
|
|||
|
|
; @details
|
|||
|
|
; Interrupts might change the actual time to finish
|
|||
|
|
;********************************************************************************
|
|||
|
|
.macro Sleep time_cs
|
|||
|
|
phx
|
|||
|
|
ldx #time_cs
|
|||
|
|
jsr sleep
|
|||
|
|
plx
|
|||
|
|
.endmacro
|
|||
|
|
|
|||
|
|
;********************************************************************************
|
|||
|
|
; @function sleep
|
|||
|
|
; @param x: Time to sleep in centiseconds (10^-2s = 10ms)
|
|||
|
|
; @details
|
|||
|
|
; Interrupts might change the actual time to finish
|
|||
|
|
; To be exact, time_cs is in units of 0.010244s
|
|||
|
|
;********************************************************************************
|
|||
|
|
.proc sleep
|
|||
|
|
VAR_1 = 0
|
|||
|
|
stz VAR_1
|
|||
|
|
@loop:
|
|||
|
|
.repeat 17
|
|||
|
|
nop ; 2 - i
|
|||
|
|
.endrepeat
|
|||
|
|
inc VAR_1 ; 3 - zp
|
|||
|
|
bne @loop ; 2/3 - r (2 if not taken, but here most of the time its 3)
|
|||
|
|
; reaching this takes 256 * (X * 2(nop) + 3(inc) + 3(bne)) - 1(last bne) cycles
|
|||
|
|
; with X = 17: T1 = (256×(17×2 + 3 +3) − 1) × (1/1MHz) = 0,010 239 s
|
|||
|
|
dex ; 2 - i
|
|||
|
|
bne @loop ; 2/3 - r
|
|||
|
|
; with T1 = for running through VAR_1, one iteration takes
|
|||
|
|
; T1 + (2(dex) + 3(bne)) × (1/1MHz) = 0,010 244 s
|
|||
|
|
rts
|
|||
|
|
; so T = N * 0,010 244 s - (1(last bne) + 4(jsr) + 6(rts)) * (1/1MHz)
|
|||
|
|
.endproc
|
|||
|
|
.endif ; guard
|