12F629 Wakes only once

[jderson]

I thought I understood this interrupt thing, but NO! The following program will wake from SLEEP with GPIO.2 going high the first time, but not with subsequent highs. What am I doing wrong? (The last three lines never get executed.) Thank you for any help.

CMCON = 7
TRISIO = %001100
OPTION_REG = %01000000
GPIO = 0
T1CON = 0
@ DEVICE MCLR_OFF, INTRC_OSC_NOCLKOUT, WDT_OFF, BOD_OFF, PWRT_ON, PROTECT_ON

'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
END

[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.