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In a similar vein....

I'm trying to use a PIC18F4520 (came with the kit) to convert a 2 channel, optical encoder signal into an Analog tachometer to replace the broken tach I have on an old servo m ...

PCM Programmer, I have a couple questions about your CCP1 code and frequency calculation:

#int_ccp1
void ccp1_isr(void)
{
int16 current_ccp;
static int16 old_ccp = 0;

// Read ...

hmm.

So, I'm using Ttelmah's quadrature code that uses a Global interrupt and I'm trying to include a tachometer by using CCP2 interrupt on pinB3 to capture every 4th rising edge. I've read thro ...

However I used it with a minimised 'global' handler, that doesn't save most registers, and like this, it happily handled a servo at up to 5000RPM, on a 128 line encoder.

If one uses a 'global' int ...

Great, thanks for the direction, that makes sense. I found the memory organization charts in the data sheets (table 5.1 for the 18f4520), I had looked before but didn't really know what i was looking ...

I have put together a demo, which should show how it works:

I'm just getting started with microcontrollers and for one of my first applications I am trying to write a quadrature encoder program t ...