12F629 Wakes only once

[languer]

I believe you may have a mismatch condition on the ports.

Try changing the following:

INTCON.1 = 0
HIGH GPIO.1
PAUSE 100
LOW GPIO.1

to:

temp = GPIO.2'read to dummy variable to clear mismatch condition of port (see s3.2.2 of datasheet)
INTCON.1 = 0
HIGH GPIO.1
PAUSE 100
LOW GPIO.1

[jderson]

Hi Languer- Thanks for trying, but no cigar! Adding the line you suggested resulted in a syntax error, so I added INTCON.0 = 0 instead (To clear GPIF). I get the same result. Strange.

[Pic2008]

Please put a pull down resistor 10K to GND from GPIO.2

[jderson]

I currently have a 3k resistor there.

[Bruce]

Place GOTO Main after your last PAUSE 1000. You should see a quick 100mS pulse on the
LED after the 1st wake-up, and a 2 second LED on time after the 2nd wake-up.

Using the internal oscillator you might also want to include DEFINE OSCCAL_1K 1 to make
sure it's calibrated.

[jderson]

Sorry Bruce, I made both changes, and the results are the same. I get one long pulse on the LED, LED goes off until button is pressed, then short pulse and then off again. Next press of button does nothing.

[Bruce]

Strange. This works precisely as expected. No matter how many times I press/release the
switch.

@ DEVICE MCLR_OFF, INTRC_OSC_NOCLKOUT, WDT_OFF, BOD_OFF, PWRT_ON, PROTECT_OFF
DEFINE OSCCAL_1K 1

CMCON = 7
TRISIO = %001100
OPTION_REG = %01000000
GPIO = 0
T1CON = 0

'GPIO.0 =
'GPIO.1 = LED HIGH OUT
'GPIO.2 = SWITCH HIGH INPUT
'GPIO.3 = MCLR TIED HIGH
'GPIO.4 =
'GPIO.5 =

Main:
    HIGH GPIO.1 
    PAUSE 1000
    LOW GPIO.1 
    
    INTCON.1 = 0
    INTCON.4 = 1
    FLAGS = 0
    @ SLEEP
    @ NOP
    
    INTCON.1 = 0
    HIGH GPIO.1
    PAUSE 100
    LOW GPIO.1
    
    INTCON.1 = 0
    INTCON.4 = 1
    FLAGS = 0
    @ SLEEP
    @ NOP
    HIGH GPIO.1
    PAUSE 1000
    GOTO Main
    
    END

10K pull-down to ground on GPIO.2 with switch pulling it to Vcc on press.