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18 lines
381 B
ArmAsm
18 lines
381 B
ArmAsm
.interruptor ticktock
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.include "extzp.inc"
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ticktock:
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bbr5 vdc_flags,@s1 ; skip if not vertical-blank interrupt
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; Increment the system tick counter.
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inc tickcount
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bne @s1
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inc tickcount+1
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bne @s1
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inc tickcount+2
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bne @s1
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inc tickcount+3
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@s1: rts
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