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David Hawley
David Hawley
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The problem is that you need to check whether the last interrupt was far enough in the past that the output can be considered stable. The most obvious solution to me is to have the ISR record the time it was called, and the main loop can simply check if that time is sufficiently before the current time. The comparison is very cheap, and doesn't require a delay. The "same record interrupt time and then compare" can cover multiple buttons on MCUs like the ATTINY85 which uses uses a single shared ISR. The disambiguation etc. resides outside the ISR.

The problem is that you need to check whether the last interrupt was far enough in the past that the output can be considered stable. The most obvious solution to me is to have the ISR record the time it was called, and the main loop can simply check if that time is sufficiently before the current time. The comparison is very cheap, and doesn't require a delay. The "same record interrupt time and then compare" can cover multiple buttons on MCUs like the ATTINY85 which uses uses a single shared ISR.

The problem is that you need to check whether the last interrupt was far enough in the past that the output can be considered stable. The most obvious solution to me is to have the ISR record the time it was called, and the main loop can simply check if that time is sufficiently before the current time. The comparison is very cheap, and doesn't require a delay. The "same record interrupt time and then compare" can cover multiple buttons on MCUs like the ATTINY85 which uses a single shared ISR. The disambiguation etc. resides outside the ISR.

Source Link
David Hawley
David Hawley
  • 1
  • 1

The problem is that you need to check whether the last interrupt was far enough in the past that the output can be considered stable. The most obvious solution to me is to have the ISR record the time it was called, and the main loop can simply check if that time is sufficiently before the current time. The comparison is very cheap, and doesn't require a delay. The "same record interrupt time and then compare" can cover multiple buttons on MCUs like the ATTINY85 which uses uses a single shared ISR.