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Isn't that supposed to reset the "sample" variable, too? No, it isn't. With CCS C you have to use either a global #zero_ram instruction or an individual initialisation of variables, when nee ...

Looks like sample isn't reset before a new measurement.

I forgot to mention that I reset the whole program before taking any new measurement. Isn't that supposed to reset the "sample" var ...

Hi again.

FvM, thanks to your last post I was able to come up with a really fast math operation for my filter. The difference between regular division and bit shifting is certainly astounding.

N ...

I previously suggested integer arithmetic and replacing the /10 division by a faster shift operation.

Applying 'scaling' to replace the floating points for integers? I did this:

int32 out, out ...

The low pass looks better now

However, it can be simplified. All digital first order low passes can be basically represented by the form
Y(n) = a*X(n) + (1-a)*Y(n-1) ...

The problem I see with your code is that it is not structured to be a streaming process. It looks more like what you would do after all there data was collected and you then went back and filtered ...

^^ Me. Forgot to log in again.

Ok, nevermind, I found for(buc=0;buc<=522;++buc) {

disable_interrupts(global);
enable_interrupts(INT_AD);
clear_interrupt(INT_A ...

^^ That is me. Forgot to log in. Razz

Hi all. For my grade project in college, I decided to build a digital guitar tuner based on a PIC18F2550.

The phase I'm currently on is testing the sampling capabilities of the PIC's ADC converter ...