Detecting a 0 to 1 transistion(rising edge) on a pic i/p

[SlimG]

Im trying to detect a 0 to 1 transistion on a pic i/p pin using a while loop.

Here is the code I have writen.

int sample_1, sample_2;

sample_1 = input(pin_a0);
sample_2 = input(pin_a0);


while (sample_1==1 && sample_2==0) // the condtn does work, it fails both ways
;

bla;

bla;

What i want is for the loop to continue when sample_1 is 0 and sample_2 is 1, but for the loop to fail when sample_1 is 1 and sample_2 is 0

can anyone help?

thanx people.

Regards

[valemike]

What you are doing is sampling sample_1 and sample_2 back-to-back. 99.999% of the time you will always get the same value on both. You should be sampling inside the while-loop. In fact you don't need two variables, just one.

[Mark]

If you want a second opinion, mine is the same as valemike's

[Guest]