Set a variable with external switch

[BiDoU]

Hello,

I want to use external push button to setup a variable in my microcontroller. I have two button: up and down. I use a debounce algorithm to assure that when I push the button one time only, the variable is incremented one time only...

But the problem for now is when I keep the button pushed, the variable increments at the rate of my debounce cycle time. I want to increment the variable very rapidly if I keep the button pushed for more than 2 seconds (and as well that I keep the button pushed when it's is increment very rapidly). And, before the 2 seconds, I don't want that the variable be incremented.

Maybe someone have an idea or refer me on some web site?

 

[IanP]

Try to add algorithm that will be looking at the "release switch" action before increasing value of the variable again..

 

[zrex]

In my previous project, i used a counter to count how many time the debounce cycle time has passed. I checked the counter against a limit value before incrementing the variable. The limit value is placed in another register so that it can be modified. At first placed a long enough limit, and gradually decreased the limit to get a 'getting faster' effect.

 

[manu]

Use that algorithm : ;-)

Switch pushed ?
 - No --> loop
 - Yes --> x,xx sec. debounce tempo, Increment variable, when timing variable oveflowed, goto :

x,xx sec. counter
Switch still pushed ?
 - No, goto...
 - Yes, Is counter variable overflowed ?
 - No, continue to count
 - Yes, increment variable, and loop.

Regards,

Manu