ON INTERRUPT not working

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- 11th April 2008, 15:12
Russ Kincaid

ON INTERRUPT not working

My program runs OK the first time, but interrupt does not go to start. It wakes from sleep (clock is active) but just idles. What am I doing wrong? This is the program:

'* Notes : Power up starts the time and turns on a FET *
'* : switch. After 15 minutes, the FET switch is *
'* : is turned off. If the stop switch is pressed *
'* : while the timer is running, the FET is turned off;*
'* : and the timer goes to sleep. The start switch *
'* : (interrupt) wakes the timer and starts it. *
'************************************************* ***************
REM device = 12F675
CMCON = 7 ' SETS DIGITAL MODE
ANSEL = 0 ' GPIO.0 TO GPIO.3 SET AS DIGITAL
OPTION_REG = 0 ' WEAK PULLUPS ENABLED
TRISIO = %00001100 ' GPIO.2 AND GPIO.3 SET AS INPUT
IOC = %00000100 ' INTERRUPT ENABLED ON GPIO.2
VRCON.7 = 0 ' TURN OFF VOLTAGE REFERENCE
N VAR WORD ' VARIABLE N DEFINED
ON INTERRUPT GOTO AGAIN
INTCON = %10010000 ' INTERRUPT ENABLED
' ************************************************** ***********

START:
INTCON.1=0 ' Clear GP2/INT flag

HIGH GPIO.0
FOR N=1 TO 900
IF GPIO.3=0 THEN SLEEPNOW
PAUSE 1000
NEXT N
SLEEPNOW:
LOW GPIO.0
SLEEP 1 ' WDT is turned off so I think it does not wake uP.
AGAIN:
GOTO START
resume
END
- 11th April 2008, 18:32
Acetronics2

Hi,Russ

Just a minute ... I'm looking for a solution, and then will explain you the "why"

Alain
- 11th April 2008, 20:07
Acetronics2

Hi, Russ

That should run ...

Code:

'**************************************************************** '* Notes : Power up starts the time and turns on a FET * '* : switch. After 15 minutes, the FET switch is * '* : is turned off. If the stop switch is pressed * '* : while the timer is running, the FET is turned off;* '* : and the timer goes to sleep. The start switch * '* : (interrupt) wakes the timer and starts it. * '************************************************* *************** REM device = 12F675 CMCON = 7 ' SETS DIGITAL MODE ANSEL = 0 ' GPIO.0 TO GPIO.3 SET AS DIGITAL VRCON.7 = 0 ' TURN OFF VOLTAGE REFERENCE OPTION_REG.7 = 0 ' WEAK PULLUPS ENABLED GPIO = %00001100 TRISIO = %00001100 ' GPIO.2 AND GPIO.3 SET AS INPUT N VAR WORD ' VARIABLE N DEFINED '************************************************************* PAUSE 300 'let's supply stabilize ... Start: N = 0 HIGH GPIO.0 'Lit The Light While ( N < 3126 AND GPIO.3 ) ' Do that while GPIO.3 is High ' AND time not finished NAP 4 'Sleep for .288 sec N = N+1 WEND ' We've read enough !!! LOW GPIO.0 'Ligts off !!! INTCON = %00010000 ' INTERRUPT ENABLED ON GPIO.2, but NOT GIE !!! @ Sleep ;Real ASM sleep @ nop INTCON.1 = 0 'cancel interrupt flag GOTO Start END
- 11th April 2008, 22:09
Russ Kincaid

Thank you. I see you don't like the "on interrupt" command; I don't either any more.

I tried your program and it works exactly the same as mine: the first pass is OK but interrupt does not go to start.

Any other thoughts?

Russ
- 11th April 2008, 22:18
mister_e

ON INTERRUPT will work, it just need some care when you write your code. But sometimes, you don't need to use it.
- 12th April 2008, 02:09
Russ Kincaid

OH, my. I found part of my problem: I was loading the hex file from the Melabs folder but Microcode Studio was saving in a different folder. No wonder nothing I did made any difference! I will have to start over and do it again.

BTW, your program does not go to sleep, at least not in 20 minutes.

Russ
- 12th April 2008, 13:41
Acetronics2

Hi, Russ

THAT Works ( in the real World ...LOL ) ... but, for the moment, I Can't use GPIO.3 !!!

so, it works with GPIO.4 ...

I'm digging for what I've forgotten ...

Code:

'**************************************************************** '* Notes : Power up starts the time and turns on a FET * '* : switch. After 15 minutes, the FET switch is * '* : is turned off. If the stop switch is pressed * '* : while the timer is running, the FET is turned off;* '* : and the timer goes to sleep. The start switch * '* : (interrupt) wakes the timer and starts it. * '************************************************* *************** REM device = 12F675 'DEVICES------------------------------------------------------------------ @ __Config _INTRC_OSC_NOCLKOUT & _WDT_OFF & _PWRTE_ON & _MCLRE_OFF CMCON = 7 ' SETS DIGITAL MODE ADCON0 = 0 ANSEL = 0 ' GPIO.0 TO GPIO.3 SET AS DIGITAL VRCON.7 = 0 ' TURN OFF VOLTAGE REFERENCE OPTION_REG.7 = 0 ' WEAK PULLUPS ENABLED WPU = %00011100 GPIO = %00011100 TRISIO = %00011100 ' GPIO.2 AND GPIO.3 SET AS INPUT INTCON = 0 N VAR WORD ' VARIABLE N DEFINED '************************************************************* PAUSE 300 'let's supply stabilize ... Start: N = 0 HIGH GPIO.0 'Lit The Light While ( N < 3126 ) AND GPIO.4 ' Do that while GPIO.4 is High 3126 ' AND time not finished PAUSE 288 'Pause for .288 sec N = N+1 WEND ' We've read enough !!! LOW GPIO.0 'Ligts off !!! INTCON = %00010000 ' INTERRUPT ENABLED ON GPIO.2, but NOT GIE !!! @ Sleep ;Real ASM sleep @ nop INTCON = 0 'Interrupt disabled GOTO Start END

Alain

PS : May be GPIO.3 is "locked" by the reset system of my EasyPic5 ???
rePS : YESS ... works fine with GPIO.3 ... when J7 is correctly set !!!