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A button with several functions

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bauche

Joined: 06 Nov 2010
Posts: 22
Location: montreal qc

A button with several functions

Posted: Fri Nov 19, 2010 8:36 pm

Hello, does anyone have an idea about how to make a button with two functions?

Code:

if (variable _1 >=1)
{
PIN_A3 = STOP;
}
else
{
PIN_A3 = SET_TIMER;
}

and also if you press the button for more than two seconds it
changes state.

Code:

#define START (input(PIN_A3))

Thank you for any hints...

vinniewryan

Joined: 29 Jul 2009
Posts: 154
Location: at work

Posted: Fri Nov 19, 2010 10:09 pm

Well, if I understand correctly, something like this should do the trick:

Code:

int8 secondspassed=0;
int16 buttontimer=0;
int1 button=0;

if(input(PIN_A3)) //button has been pressed
{
button=1;

if(buttontimer>xxx) //how ever many timer cycles are in 1 second
//or you can use a hardware timer
{
secondspassed++;
buttontimer=0;
}
else
{
buttontimer++;
}
}
else
{
if(button==1) //button has been released
{
button=0;

if(secondspassed<2) //button was NOT held down for 2 seconds
{
if(variable_1>=1)
{
stop();
}
else
{
set_timer();
}
}
else //the button HAS been held down for 2 seconds
{
//do something here
}
}
else //the button is not currently being pressed
{
secondspassed=0; //reset
}
}

This code is not tested, but it's a general idea of how you would call different functions depending on different button conditions.
_________________
Vinnie Ryan

PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Sat Nov 20, 2010 9:19 pm

Quote:

Does anyone have an idea about how to make a button with two functions?
If you press the button for more than two seconds it changes state.

This thread has code, and links to other code, for a button with several features:
http://www.ccsinfo.com/forum/viewtopic.php?t=42027

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