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J. Nick Koston
da9c44d28d
Split the μs→ms conversion into two paths to keep the interrupt- disabled critical section bounded: - Common path (delta < 10 ms): while loop runs at most 10 iterations (~100 ns). This covers the normal hot-path case where millis() is called thousands of times per second. - Rare path (delta >= 10 ms): constant-time multiply-by-reciprocal via /1000 (compiled to __umulsidi3, ~2.5 μs). Only fires after a long block (WiFi scan, boot, component stall), where the extra latency is negligible relative to the block that caused it. Addresses the concern that a multi-second WiFi scan block could cause the unbounded while loop to hold interrupts for tens of microseconds.
