Chief Delphi - Processing pre-set Interrupts

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Processing pre-set Interrupts

I am having troubles with my encoder. It is a 128 ppr encoder, and at close to maximum shaft RPM, I start to get bad readings from it. I figured this was from the RC trying to process too many interrupts per second, so I know I need decrease the ppr of the encoder.

The way I thought I could do this was by including a true/false check statement in the InterruptHandlerLow() function that would only call the Encoder Handler Function every other time that interrput happened. I tried doing this with if's and switch statements, but neither worked. I still got 128 ticks per revolution.

Heres a sample of the code I am using.

Code:

unsigned char loops=0;



void InterruptHandlerLow()     

{     

     if(loops==0)

     { 

         if (INTCON3bits.INT2IF && INTCON3bits.INT2IE) // left encoder interrupt?

                { 

                        INTCON3bits.INT2IF = 0; // clear the interrupt flag [91]

                        Left_Encoder_Int_Handler(); // call the left encoder interrupt handler (in encoder.c)

                }

          loops=1;

     }

     else loops=0;

}

Any ideas?

Re: Processing pre-set Interrupts

Quote:

Originally Posted by Tom Bottiglieri

Code:

unsigned char loops=0;

 

void InterruptHandlerLow() 

{ 

if(loops==0)

{ 

if (INTCON3bits.INT2IF && INTCON3bits.INT2IE) // left encoder interrupt?

                { 

                        INTCON3bits.INT2IF = 0; // clear the interrupt flag [91]

                        Left_Encoder_Int_Handler(); // call the left encoder interrupt handler (in encoder.c)

                }

loops=1;

}

else loops=0;

}

Any ideas?

Check the magical Encoder FAQ for a possible answer.

-Kevin