electroncraz91

and... resolved! Added a 0603 10nF decoupling cap directly on pins 22 and 23 to ground. Interrupt now fires exactly 1 time throughout the slow rise with Hysteresis ON, even letting it run on the scope for several minutes without a glitched...

Correction: volatile uint32_t *configRegister = portControlRegister( digitalPinToInterrupt( 22 ) ); Got the correct hardware address and hysteresis bit is set by attachInterrupt(). When I clear it.. holy moly! Seems the silicon Schmitt...

I've been diving in the reference manual, particularly section 11.7.191. Currently using Teensy pins 23 and 22 for interrupt inputs, Just blindly writing the hysteresis bit, but this does not improve. I'll have to investigate further. I will...

Stumbled upon this post looking for a solution. Yet here we are. I have a zero-cross optocoupler circuit looking at 60hz. I toggle a pin ON/OFF on entrance/exit with a defined "RISING" pin interrupt. It fires 2-4, sometimes 6-7 times! Used...