A Simple IOC Routine (Interrupt On Change)

[lugo.p]

Hi, Luis

But ... Where's your interrupt stubb gone ???

you should turn INTCON.7 to OFF ... as an interrupt occuring sends you to PAUSE asm routine library ... @ Prog mem location 4 !!!


here you do not use the interrupt system but just flag the Change in I/Os ... and further test the flag.

it would really be a miracle if your program shows you what you were looking for ...

Alain

The trick here is that i'm not using normal interrupt, all I do for this is, if a change occurs on RA0 turn on RC5 half second and then turn it off. the GIE turn off when a change on RA0 happen and GIE = 1 again when the missmatch ends.

Only simulate and you'll see

[Acetronics2]

Hi, Luis

I 've already made much worse than that ...

Darrel can confirm !!!

But your code goes straight to the pBp libraries @ location 4 , if you enable GIE ... ( I verified it with MPSIM !!! )

Program pointer passes over ALL the PAUSE library ... luckily it's the only routine here...

DANGER !!!

Alain

[rmteo]

Sitting in a loop while waiting for something to happen (in this case, polling the RAIF flag) isn't really what interrupts are about.

To be really useful, it should actually interrupt whatever your program is currently doing when RA0 changes state. For example, let's say you have a routine the is blinking PORTC.5 at a slow rate of 500mS ON and 500mS OFF continuously in a loop. If the state of RA0 changes (eg. by using a switch or sensor), then you want the blink rate to go faster rate, say 100ms ON and 100ms OFF.

[lugo.p]

Acetronics, i dunno understand, i'm newbie and my english is not excellent, but since i'm going to use IOC for a button and external INT over RA2 for measure a pulse, when i get there, i think i'll see the problem.

Meanwhile if i'm going to use INT over RA2 to measure pulse width, i do need to send first a dummy pulse before the pulse to measure?