Accurate Freq Measurment

[davidcope]

Hi,

I've read the great advice and example code here during a search of PIC period measurement. I'm in the process of using a PIC 18F2431 and using C.

Not being an expert with PICBasic, could I ask what PIR3.1 refers too from the example given above?

Capture VAR PIR3.1

Thanks in advance, David.

[Acetronics2]

Hi,

"C" ... What is "C" ...

is there anything called "C" somewhere ????

has "C" ever existed ???

Just open your pic datasheet, interrupts flags section ... you'll find it.

BTW : VAR ... just means " other name for " ( something like # DEFINE ... Ooops ... )

Alain

[Bruce]

PIR3.1 is bit #1 in the PIR3 register. Capture VAR PIR3.1 just creates an alias for this interrupt flag bit.

[davidcope]

PIR3.1 is bit #1 in the PIR3 register. Capture VAR PIR3.1 just creates an alias for this interrupt flag bit.

Many thanks Bruce that makes it perfectly clear.

@Alain Thanks too. Apologies for mentioning the "C" letter BTW!

As for the RTFM thing. Please, it's a cop out. It's the easiest thing in the world to belittle someone for not finding the information (or quite understanding how to frame a question) you may think should be obvious, but in the context of the wider picture may not be to the person asking the question. And of course the "Problem" may only be one of several or several tens that the poster may be concurrently dealing with at the time of the question.

Sorry Alain, I really don't mean to appear to be negative after you've been kind enough to reply to my question, it's just that RTFM is so often used to limit learning, not encourage it.

So yes, I see now that Section 10.2 (Page 102) "PIR Registers" of the data sheet provides the information for the code I was referring to. That's one problem down...many more to go.

Thanks again for your inputs. David.