0,0 → 1,108 |
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<h1> words/1ms.asm </h1> |
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<pre> |
; ( -- ) Time |
; R(--) |
; busy waits (almost) exactly 1 millisecond |
VE_1MS: |
.db $03, "1ms" |
.dw VE_HEAD |
.set VE_HEAD = VE_1MS |
XT_1MS: |
.dw PFA_1MS |
; error: the additional instructions need appr. |
; 4 cpu cycles, Z should be decreased by 1 or 2 |
PFA_1MS: |
.set delay_cycles = cpu_frequency / 1000 |
ldi zl, LOW( delay_cycles / 4 ) |
ldi zh, HIGH(delay_cycles / 4 ) |
sbiw zl, 42 ; internal plus forth kernel overhead |
PFA_1MS1: |
sbiw zl, 1 |
brne PFA_1MS1 |
rjmp DO_NEXT |
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; : ms 0 do 1ms loop ; |
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