The SR Latch is well known for doing this for an SPDT. I make it work for the much more common and single input wire SPST.

Eliminate SPST Debounce Delay with an SR Latch https://spacetimepro.blogspot.com/2023/09/switch-debouncer.html

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On 30/09/2023 7:24 am, M. Simon wrote:

The SR Latch is well known for doing this for an SPDT. I make it work for the much more common and single input wire SPST.

Eliminate SPST Debounce Delay with an SR Latch https://spacetimepro.blogspot.com/2023/09/switch-debouncer.html

Didn't look into the logic but the redundant jumps were easy enough
to eliminate.

: SWITCH-STATE? ( what is the current state of the switch ? "1" if open or opening "0" if closed or closing )

Switch-State @ ( - SW-State )
Switch-Debouncing? ( - SW-State t/f )
IF EXIT THEN
Switch-Port @ Switch-Mask AND DUP Switch-In ! ( - SW-State SW-Port ) 10uSec-Wait
Switch-Port @ Switch-Mask AND ( - SW-State SW-Port SW-Port )
10uSec-Wait
Switch-Port @ Switch-Mask AND ( - SW-State SW-Port SW-Port SW-Port )
Three=? ( - SW-State t/f )
IF
Switch-In @
=
IF
Switch-State @ EXIT
THEN
Switch-In @ DUP Switch-State !
Start-Debouncing
THEN
;

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On 30/09/2023 7:24 am, M. Simon wrote:

The SR Latch is well known for doing this for an SPDT. I make it work for the much more common and single input wire SPST.

Eliminate SPST Debounce Delay with an SR Latch https://spacetimepro.blogspot.com/2023/09/switch-debouncer.html

Didn't look into the logic but the redundant jumps were easy enough
to eliminate.

: SWITCH-STATE? ( what is the current state of the switch ? "1" if open or opening "0" if closed or closing )

Switch-State @ ( - SW-State )
Switch-Debouncing? ( - SW-State t/f )
IF EXIT THEN
Switch-Port @ Switch-Mask AND DUP Switch-In ! ( - SW-State SW-Port ) 10uSec-Wait
Switch-Port @ Switch-Mask AND ( - SW-State SW-Port SW-Port )
10uSec-Wait
Switch-Port @ Switch-Mask AND ( - SW-State SW-Port SW-Port SW-Port )
Three=? ( - SW-State t/f )
IF
Switch-In @
=
IF
Switch-State @ EXIT
THEN
Switch-In @ DUP Switch-State !
Start-Debouncing
THEN
;

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M. Simon schrieb am Freitag, 29. September 2023 um 23:24:54 UTC+2:

The SR Latch is well known for doing this for an SPDT. I make it work for the much more common and single input wire SPST.

Eliminate SPST Debounce Delay with an SR Latch https://spacetimepro.blogspot.com/2023/09/switch-debouncer.html

Try a zener diode, perhaps with a capacitor.

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Eliminate SPST Debounce Delay with an SR Latch https://spacetimepro.blogspot.com/2023/09/switch-debouncer.html

Try a zener diode, perhaps with a capacitor.

You can't get zero delay with a zener and a capacitor. With this circuit you can.
Deglitch is separated from debounce. No deglitch? No delay.
It also explains (in schematic form) how to write SPST debounce software.
Does a zener and a capacitor do that? Well brute force maybe. Delay until there is no doubt.
A day or a day and a half. More is better. Them mechanics is pesky.

You are essentially correct though. This circuit is too expensive to be used everywhere unless it is done on chips.
Which is what I expect will happen. Free upgrade is a very attractive offer.
I also expect this to be the standard for software.

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On Saturday, September 30, 2023 at 4:03:24 PM UTC+2, M. Simon wrote:

Eliminate SPST Debounce Delay with an SR Latch

[..]

You can't get zero delay with a zener and a capacitor. With this circuit you can.
Deglitch is separated from debounce. No deglitch? No delay.

Isn't this just a state-machine?

-marcel

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On Saturday, September 30, 2023 at 5:03:10 PM UTC, Marcel Hendrix wrote:

On Saturday, September 30, 2023 at 4:03:24 PM UTC+2, M. Simon wrote:

Eliminate SPST Debounce Delay with an SR Latch

[..]

You can't get zero delay with a zener and a capacitor. With this circuit you can.
Deglitch is separated from debounce. No deglitch? No delay.

Isn't this just a state-machine?

-marcel

Yes of course. The interesting thing about it is that the SPDT SR Latch Debounce has been known for decades and especially since Max Maxfield's articles 3 1/2 years ago. Yet in all that time no one ever thought to apply the principles to an SPST. Within
hours of understanding the SPDT SR circuit, I was working on this SPST version. It completely explains SPST debounce with nothing extraneous added. Software gets improved from the hardware example.

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On Saturday, September 30, 2023 at 5:03:10 PM UTC, Marcel Hendrix wrote:

Isn't this just a state-machine?

-marcel

I can see chip makers offering this as an input option now that the circuit is becoming known. Or chips full of debouncers.
Zero IP cost.
Simon De Bouncer is my friend. LOL.

MSimon

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