12f675 wont wake up

[PeterK]

Hi,

I programmed a 12f675 with comparotors off and digital i/o's.

I have a 32.768 k osc.

I programmed the watchdog off.

I use the example in picbasic for wake up from interupt and change the Port statements to GPIO and set INTCON.3 = 1 to enable int on change and INTCON.0 = 0 to clear it.

I put the device into sleep, give a change of level interupt on GPIO.2, the device momtarily wakes up, but then goes to sleep again.

I put a statement in so if the GPIO.2 goes low (ie Interupt) then exit the sleep loop and flash a led continiuously.

I know it wakes up as the current drawn goes up as observed by my current meter.

Any assistance appreciated.

 

[Nigel Goodwin]

Does your BASIC compiler specifically support the 12F675?, I notice you mention changing the code to GPIO - which leads to suspect perhaps it doesn't?.

Different PIC's react in different ways to wakeups, some perform a reset, some simply carry on from where the sleep instruction was issued. I think the 12F675 carries on from where it was.

You also need to check what code the compiler is producing, it's really essential to have a working knowledge of assembler to use a high level compiler effectively.

 

[StupidDum]

...
I put a statement in so if the GPIO.2 goes low (ie Interupt) then exit the sleep loop and flash a led continiuously.
...
.

where do you put this instruction in?
inside the interrupt subroutine?? or main loop?

 

[PeterK]

Hi,

The program I have is as follows
DEFINE ONINT_USED 1

INTCON.3 = 1 ' Enable the port change interrupt

CMCON = 7 ' Disables Analog Inputs
ANSEL = 0 ' Sets Analog Inputs as Digital I/O

TRISIO = $FF ' All As Inputs

On_Test: ' Wait for the interupt on GPIO.2, low from Switch

Pause 1

IF GPIO.2 = 0 Then
GoTo Awake
EndIf

INTCON.0 = 0 ' Clear the RB port change flag bit

Nap 7 ' Go to sleep. When the watchdog is
' disabled, NAP won't wake up until
' an interrupt occurs.

GoTo On_Test ' Do it again upon waking

Awake:

Low GPIO.0
Pause 10
High GPIO.0
Pause 10

GoTo Awake

I hope someone can explain
Q. 0n INTCON.3 = 1 and
INTCON.0 = 0
Are they references to banks?
Thanks. Peter