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wake up from sleep problem with pic12f629 :(

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bouvett

New Member
Hi,
i have written a program with the scope of lighting leds using interrupt on change on port 3 but unfortunatly though the micro goes into sleep it won't wake up... i have tried all the other I/O lines and everything is like in the tutorial
https://www.electro-tech-online.com/custompdfs/2009/09/PIC_Mid_A_7.pdf

still the program won't work.. at least surely in the Mplab sim....

one other thing i noticed is that the GPIO pin of pin GPIO3 is always set... why is this so? is it because gpio3 is always an input?
thanks a lot
;PIC12F629
;This program is made to read an input from Gp3. each time it gets set it will switch the next led on.
;The program goes in to sleep and wakes only when the switch is set..
;uses the internal oscillator

#include <p12f629.inc> ; call header file of pic12f629

CBLOCK 0x20
PORT_SHADOW
ENDC

LIST P=12F629 ;SET MICROCONTROLLER USED
ORG 0 ;reset vector
GOTO START_SETTINGS

;NO ISR USED, INTERRUPTS NEEDED ONLY TO WAKE UP FROM SLEEP

;Configuration Word
__CONFIG H'3FC4' ;SELECTS INTERNAL OSCILLATOR WITH NO CLOCKOUT, MCLR INTERNAL, BOD AND POR= ON, PORTECTION OFF

;////////////////////////////////////////////////////////////////////////////////////////////////////////
START_SETTINGS
BANKSEL CMCON
MOVLW B'00000111' ;SET DIGITAL INPUTS
MOVWF CMCON

BANKSEL TRISIO
MOVLW B'00000000' ;SETS ALL PORT BITS TO OUTPUT EXCEPT FOR BIT3 WHICH IS ALWAYS AN INPUT
MOVWF TRISIO

;NOTE THAT GP3 DOESN'T HAVE AN INTERNAL WEAK PULL UP

BANKSEL OPTION_REG
MOVLW B'00000100' ;SETS SOURCE OF TMR0 TO INTERNAL OSCILLATOR AND PRESCALAR TO TMR0,PRESCALAR SET TO 1:32
MOVWF OPTION_REG

;INTERRUPTS: SET THE INTERRUPT ENABLE FOR PORT CHANGE BUT DO NOT SET THE GLOBAL INTERRUPT..
;SO THAT THE MICRO WOULD WAKE UP FROM SLEEP BUT NOT GO THROUGH ISR
;AT SLEEP THE I/O WILL STILL WORK NORMALLY

BANKSEL INTCON
MOVLW B'00001000' ;PORT CHANGE INTERRUPT ENABLED
MOVWF INTCON

;SWITCH OFF TIMER1 AS IT WILL NOT BE USED
BANKSEL T1CON
BCF T1CON,0

BANKSEL IOC
BSF IOC,IOC3

;CALIBRATE THE OSCILLATOR
BANKSEL OSCCAL
CALL 3FFH
MOVWF OSCCAL

;///////////////////////////////////////////////////////////////////////////////////////////////////////////

;PROGRAM STARTS HERE

;PORT_SHADOW RES 1

START CLRF PORT_SHADOW ;RESET SHADOW

BANKSEL GPIO
MOVF GPIO,W

BSF PORT_SHADOW,0 ;SET FRIST LED
MOVF PORT_SHADOW,W
MOVWF GPIO

; CLRWDT

SLEEP ; GOTO SLEEP
;IF WAKED UP IT MUST BE SINCE THERE IS A PORT CHANGE, I.E IN BIT 3
;THUS WAIT FOR IT TO GO LOW(SWITCH DEPRESSED)
;WHEN IT DOES, READ THE PORT AGAIN TO STOP THE CONDITION AND GO BACK TO SLEEP

BANKSEL GPIO
MOVF GPIO,W ;READ SO TO SWITCH OFF CHANGE" CONDITION
BCF INTCON,GPIF ;CLEAR FLAG

BCF PORT_SHADOW,0 ;CLEAR FIRST LED
BSF PORT_SHADOW,1 ;SET THE NEXT LED
MOVF PORT_SHADOW,W
MOVWF GPIO

;CHECK WHETHER SWITCH IS DEPRESSED
CHECK BTFSC GPIO,3
GOTO CHECK

;DEBOUNCE DELAY
NOP
NOP
NOP
NOP

SLEEP

BANKSEL GPIO
MOVF GPIO,W ;READ SO TO SWITCH OFF CHANGE" CONDITION
BCF INTCON,GPIF ;CLEAR FLAG

GOTO START ;START AGAIN

END ;PROGRAM STOPS HERE


thanks a lot
regards
 

gaspode42

Member
Hi

well this may be a problem
BANKSEL TRISIO
MOVLW B'00000000' ;SETS ALL PORT BITS TO OUTPUT EXCEPT FOR BIT3 WHICH IS ALWAYS AN INPUT
MOVWF TRISIO

Should this not be:

MOVLW B'00001000' ?

Rupert
 
Last edited:

Mr RB

Well-Known Member
Are you actually getting a change on the port pin(s)? You said GP3 is always set?

I would check the voltage on GP3 say with a multimeter. Or disable going into sleep (for now) and just echo GP3 to another GP pin output to a LED, so you can see GP3 sensing the input and the LED going on/off accordingly.

And you might want to double check your config fuses setup, and maybe re-write it using the standard bit flags so it is easier to debug. I have no idea if "__CONFIG H'3FC4'" is doing what you want it to do.
 
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