The best way I'm using is
You need to detect if button was pressed and start counting from this point.
you can just in main loop check if pin is low (because you are using pull-up to power) and after this you have two ways: start a timer or to count in main cycle. Doesn't realy matter, speeds are very fast you will not see difference. Timer is more accurate but uses interrupts versus simple cycle counting but without interrupts.
After counting variable started to increment itself every cycle you are checking if it was released by simply checking pin.
So here is the magic: after releasing button you have some value in your counter, now you need to check how long it was pressed depending on it's value, here are examples:
- ButtonVar is 10 -> this is bouncing, ignore it and wait the next press, clear counter var
- ButtonVar is 5000 -> this is representing in example 50 ms, ignore it, too fast press, clear counter var and wait the next press
- ButtonVar is or more than 1000 and less than 50000 - 100+ms press->do task
- ButtonVar is greater than 50000 equals 500ms and longer press ->do task
This is very simple way, you can use it
1.without any interrupts and
2.without timers, your main cycle frequency is fast enough and it's much more faster you need (millions or less times per second)
3. automatically filter any bounce or noise (equals to extra-fast presses, ignore it)
int countersA = 0; // or you can use an array for many buttons
while(1)
{
CheckMyButton();
};
void CheckMyButton(void) //or use int to check many buttons
{
if (CheckPinIsLow) { counterA++; }
else
{
if ((counterA >= 1000) && (counterA<5000)) DoOur100MsTask();
if (counterA > 5000) DoOur500MsTask();
counterA = 0;
}
};
