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--can i do like this?
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No, probably not.
You need to use a proper clock and separate the logic into functional blocks;
1) Push button interface, with debounce logic
* synchronize the push-button to the clock
* detect an edge, and then ignore the input for a while
2) A counter
3) Synchronized push-button and match control logic
Create a testbench for your logic, eg., something that contains a clock and a noisy push-button press, and use that to confirm that you only see one button press.
If you don't know how 'noisy' to make your button press, create a simple design and download it into your hardware. Add a SignalTap II instance and capture a trace from a push-button press. You will see that the signal generates multiple transitions when you click on the button. Your debounce logic needs to convert the ugly push-button signal into a nice clean logic level.
Cheers,
Dave
Honored Contributor
