debounce routine

[bogax]

Here's a bit of sillyness.

 

It's a debounce routine using two bit

vertical counters with simulated keypresses.

 

A counter is used for to simulate the

keypresses.

 

The first line at the top is the simulated

keypresses.

 

The first half of each simulated press or

release is random to simulate bounce.

 

That's the second line, the bouncy key signal.

 

The third line is the debounced signal.

 

The last two lines are the two bit debounce

counter.

 

Debounce follows the keypress on the third

good key sample.

 

There's eight channels but only one is shown.

 

It does 32 samples from left to right across

screen then waits for fire and then does it again.

 

debounce.bas

 

 

 

edit

I should point out that debounce is

inverted relative to the key.

On the screen debounce is inverted

to appear the same as the keypress.

A switch reads 0 when closed.

Debounce goes to 1 when the switch

is closed. I thought that would fit

better with how it would be/is used

in bB.

(Although I don't expect that a

debounce is necessary or that this

debounce routine would ever actually

be used )

Edited June 11, 2013 by bogax

[+Gemintronic]

I know not what this be do. I think R.T. uses the word "debounce" to refer to stopping the fire button from repeating immediately. Is that what this is demonstrating?

 

P.S. THANK YOU again for your score debug code. it greatly helped me recently overcome a coding block (like a writers block) I had with chasing enemies around a multi-screen map.

[bogax]

No but that's what this bit does

for fire.

temp1 = ((jf ^ $80) | INPT4) & $80 : jf = INPT4
if temp1 then goto draw

 

see this thread

 

Demo - Batman

Edited June 11, 2013 by bogax

[bogax]

Still playing with it.

Here I removed the inversion

of debounce on the screen.

Debounce goes high for the

simulated keypress going low.

 

I added edge detection (the

fourth line)

 

I streamlined the debounce

and made it wait for 4 good

samples.

 

debounce2.bas

[+Random Terrain]

I think R.T. uses the word "debounce" to refer to stopping the fire button from repeating immediately. Is that what this is demonstrating?

 

That has been changed to Repetition Restrainer:

 

randomterrain.com/atari-2600-memories-batari-basic-commands.html#repetition_restrainer_for_fire_button

 

A similar thing is used for the reset switch and the select switch.