INT0 Zero Interrupts

Hi All,
I have been banging my head on the wall for weeks. I am not sure what I am missing and I have read over the datasheet many times. Please take a sec to see if you notice anything wrong.

I can't get INT0 to interrupt. The TMR0 interrupt is working great, the led flashes 100ms as desired. If I take pin RA0 and jump to 5V or Ground the interrupt doesnt seem to interrupt. The program should turn on an led if it interrupts.

MCU: PIC18F1330

Thanks Again,
Nemesis

I gotta ask . . . Why do you put the percent sign before the value of your variables? It seems to me you are telling the Variables, ports and registers to read binary, and I suppose as long as you only use zero and one it will work, but it's confusing as all get out. Why not just use 0 and 1 ?

Percent madness... I try to make my variable names start with bt for bit, w for word, l for long. The percents really just remind me they are bits. I totally could ditch them. lol maybe I should.

Thanks for looking at the file. I can't figure out what I am missing, really hoping someone finds something.

The chart sec 9.1 shows INT0 port latch as 1 not zero when INT0 enabled. Other than that I see nothing, but I am really sleepy right now :D Doggone PBP interrupts, it doesn't take much for them not to work . . . You might try commenting out the parts that do work until you hit the right formula . . .

Anybody pick up anything else? I feel really frustrated with this interrupt. I think I will try pulling out everything but that interrupt as Joe suggested. Just hoping that maybe the order or bit is wrong in one of the registers.

Thanks for your replies Joe S.

I figured out the problem. My ADCON1 should have been:

ADCON1 = %00011111 ' Set all to digital

Thanks Again,
Nemesis

After INT0 interrupt you are not clearing INT0IF variable. I don't know does it make difference or not, but add

Code:

---

INT0IF = 0

---

before last ENDIF in INT0 interrupt section.


Also TMR0 comment is not valid. It should be ON ;)

Code:

---

INTCON =  %10110000 ' Global, TMR0 off, INT0 ON

---

BR,
-Gusse-

Will do thanks Gussee. Sometimes I am victim of my own cut and paste. Thanks again all.

-Nemesis