Hello All,



I have the following code running that sends high output to portb bit 5

And loops checking for a switch input on portb bit 7 the code turns off
bit 5 when the switch is pressed and the dly20 in the code just delays
20ms for switch debounce.





FINALWAIT    BSF PORTB,RB5

                     BTFSC PORTB,START_PB

                    GOTO FINALWAIT

                    CALL DLY20

                    BTFSC PORTB,START_PB

                    GOTO FINALWAIT

                    BCF PORTB,RB5

                    CALL WAITSTARTUP

                    GOTO EE2D



This code works good but what I need to do is have the output (portb,5)
get turned off after a given amount of time like 10-15sec, sort of a
timeout if the switch never gets pressed, my problem is that it seems
that if I take the bsf,portb,rb5 out of the finalwait loop, then the bit
seems to go high and then reset? Port B,5 is driving a relay which
latches in the above code but as I said, if I take the bsf porb,rb5 out
of the loop then the relay seems to come up and then drop. Are the
outputs on a 16f84 latching or does the output have to be in a loop in
this case. Is there some other way to do the above in code that would
implement a timeout if the switch never gets pressed. Any help would be
great. The code below should give me aprox 15 seconds wait, this code
does time out the output when implemented into the above code but the
relay doesn't stay up for the whole time it seems to come up once and
then drop.



MYWAITSEC   BSF PORTB,RB5

                        MOVLW H'0f'

                        MOVWF SECNT2               ;

MYWAIT      MOVLW D'250'

            CALL NMSEC

           BTFSS PORTB,START_PB

            RETURN

            MOVLW D'250'

            CALL NMSEC

            BTFSS PORTB,START_PB

            RETURN

            MOVLW D'250'

            CALL NMSEC

            BTFSS PORTB,START_PB

            MOVLW D'250'

            CALL NMSEC

            BTFSS PORTB,START_PB       ;

            RETURN                     ;

            DECFSZ SECNT2,f            ;

            GOTO MYWAIT                ;

            RETURN



Thank You,

Steve

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