QUERY · ISSUE

utime.sleep_us() overflow

openby socketpairopened 2022-09-11updated 2022-09-12

docs

>>> from utime import sleep_us
>>> sleep_us(24*3600*1000_000)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
OverflowError: overflow converting long int to machine word

It's not documented about any limits on the argument. Either fix in documentation or fix. Fixing is better.

CANDIDATE · ISSUE

utime.sleep(24*3600) sleeps only 500 seconds on ESP32

closedby socketpairopened 2022-09-14updated 2022-09-14

bugport-esp32

MicroPython v1.19.1 on 2022-06-18; ESP32 module with ESP32

boot.py:

from utime import sleep, time

while True:
    print(time())
    sleep(24 * 3600 - 499) # without - 499 will print every 500 seconds

will print a line roughly at every 1-2 seconds:

I guess, it's overflow+wraparound issue.

Assessment

S Sonnet · high

Both issues involve integer overflow in utime sleep functions with large duration arguments, but they are distinct bugs. #9280 is about sleep_us() raising an explicit OverflowError (overflow converting long int to machine word) and is port-agnostic. #9304 is about sleep() on ESP32 silently wrapping around and returning early (~500s instead of 86400s) — a different function, different failure mode (silent wraparound vs exception), and ESP32-specific. Neither resolves the other; they share root cause concepts (32-bit integer overflow in sleep timing) and the same code area, but require separate fixes.

Suggested action

Keep both open. Cross-reference them as related — a fix for sleep overflow on ESP32 may inform or partially address sleep_us overflow, but they target different functions and failure modes. Maintainer should check if a common fix (e.g., using 64-bit intermediates for sleep duration math) can address both.

utime.sleep_us() overflow

utime.sleep(24*3600) sleeps only 500 seconds on ESP32

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