attachInterrupt missing 1uS pulses

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attachInterrupt missing 1uS pulses

By RichardS
- Thu Jun 02, 2016 4:15 pm #48476 What is the specification for how long a low or high needs to be on the pin before its acted on....

Does the ESP8266 have its own edge detection hardware, or is this being done in software... I assume hardware.

So why does it miss 1uS falling pulses? I can clearly see them on my scope.

RichardS
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Re: attachInterrupt missing 1uS pulses

By RichardS
- Thu Jun 02, 2016 4:24 pm #48478 Just looked at the code being called behind the scenes and yes it is hardware level pin change that fires an interrupt, so why missing small pulses?

RichardS
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Re: attachInterrupt missing 1uS pulses

By RichardS
- Fri Jun 03, 2016 7:45 pm #48540 bump...

Seriously now.... still having issues with missing fast 1uS low going pulses..... you would think on a 80Mhz 32 bit processor it could catch faster than that!

RichardS
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Re: attachInterrupt missing 1uS pulses

By martinayotte
- Fri Jun 03, 2016 9:07 pm #48542 Sincerely, I have no idea why interrupts should not occurred ...
Which are you using RISING/FALLING/CHANGE ?
I've heard that maybe any other CHANGE can have a bug on high speed due that the distinction between RISING/FALLING is done in software, hardware is only supporting CHANGE.
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