arduino / arduino/ArduinoCore-avr

Potential Issue in I2C Timeout

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Dominant language
C
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Description

https://github.com/arduino/ArduinoCore-avr/blob/c8c514c9a19602542bc32c7033f48fecbbda4401/libraries/Wire/src/utility/twi.c#L171

If `micros` overflows after the start and before the end of this read function, it will overflow and possibly return before the timeout.

Contributor guide

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Research direction

Start in libraries/Wire/src/utility/twi.c around line 171 and inspect the read function's timeout calculation. Check behavior when micros overflows between the read's start and end, then verify that the timeout still behaves correctly across wraparound.

Written by the indexing model from the issue text.

Assessment

Tech stack
c
Domain
embedded-iot
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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