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Grazfather
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Oct 3, 2026
A single busy_sleep(20_000) compiles to a 7-cycle loop in ReleaseSmall, so each toggle took ~8.75 ms at 16 MHz and the LED looked solidly on. Repeating it 50 times gives ~437 ms per toggle (~1.1 Hz blink). Tested on an Emakefun RF-Nano V3.0 (ATmega328P @ 16 MHz): ~34 blinks in 30 s, matching the computed value.
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On real hardware (ATmega328P @ 16 MHz, ReleaseSmall) the
blinkyexample toggled the LED every ~9 ms, so it looked solidly on.A single
busy_sleep(20_000)compiles to a 7-cycle loop (cpi/cpc/breq/adiw/rjmp), i.e. ~140k cycles ≈ 8.75 ms per toggle. This repeats it 50 times, giving ~437 ms per toggle (~1.1 Hz blink).Tested on an Emakefun RF-Nano V3.0 (Arduino Nano compatible, ATmega328P @ 16 MHz) with the
arduino-nano_blinkytarget: ~34 blinks in 30 s, matching the computed value. Thearduino-uno_blinkytarget uses the same chip and clock, so the same timing applies.