Interrupt Or I Am Going To Die

[SteveB]

You need to read PORTB in your ISR to clear the mismatch. Otherwise, like you have mentioned, you will never be able to get out of you ISR.

HTH,
Steve

[sayzer]

Also,

Instead of High PORTA use PORTA=255
and
Instead of LOW PORTA use PORTA=0



Note:
"...Bu pinleri sıfırladıktan sonra alıcı olarak ayarlamalısın"

anteni iyi ayarla!

---------------------------------------

[kunguz]

Thanks for replies, what I wonder is I don't know how to read portb; Can you just write down a sample code _?

Thanks in advance,

Saolasın Hocam :P

[sayzer]

Like what?

Example:

IF PORTB.6 = 0 then .....

or another one

WHILE PORTB.3 = 0
..
....
WEND

or

IF PORTB.2 = 1 AND PORTB.5 = 0 THEN .....

Etc..


These are some kind of readinds.
Make sure you make them input pin.


----------------

[kunguz]

So sorry but can you correct my code , I tried everything as in your sample code for PORTB.6 ; But can't get it out.

By the way my msn is [email protected]. (Olmadı bana burdan yardımcı olursan çok sevinirim, altı üstü bi interruptan çıkamadık)

Here is my new code below ;
device 16f84a
ON_INTERRUPT goto flash
intcon = %10001000
input portb.6 ' Bu pinleri sıfırladıktan sonra alıcı olarak ayarlamalısın

loop:
high porta
delayms 200
low porta
delayms 200
goto loop

disable

flash:
WHILE PORTb.6 = 1: WEND
intcon.0 = 0
delayms 20
low porta
CONTEXT RESTORE

end

[sayzer]

Couple of things to remember.

1. It is not a good idea to post an e-mail on the forum. You will get thousands of junks to your e-mail. I suggest that you remove it right away and PM to members instead.

2. You are not using PBP, but this is a PBP forum

3. Lets keep this issue on this forum, so that it can be some help to some other members having similar issue.


-----------------------------
Let me try to start by changing the code to PBP first.

In your schematic, I would use Interrupt on RB0 pin, instead of RB6 pin. May be you should change that first.

Then, assuming you are now using RB0/Int, we set Intcon Bit 4: RB0/INT External Interrupt Enable bit. Thus, we end up with INTCON = %10010000

Now the code should look like below but remember it is with PBP statements. You can get around it.

TRISA =  %00000000     'All output.
TRISB =  %00000001     'RB0 is input, rest is output.
INTCON = %10010000     'Enable global (Bit7) interrupt, enable RB0/Int (Bit4) 
ON INTERRUPT GOTO FLASH

                                                 
loop:
    PORTA = 255
    PAUSE 200
    PORTA = 0
    PAUSE 200
    GOTO loop

disable

    FLASH:
        PORTA = 0
        INTCON.0 = 0

RESUME
ENABLE

END

Also, why do you have to use interrupt?


-------------------

[SteveB]

Add this line before your main loop:

RBIF var INTCON.0

Add these two lines to your flash subroutine:

@ MOVE?BA PORTB 'Read PORTB by placing it WREG
RBIF = 0 'Clear the interrupt flag

Also, read the pic datasheet on interrupts and under the I/O Ports section. You should find were it mentions both of items added to the ISR.

Steve

[SteveB]

As Sayzer asked,

Also, why do you have to use interrupt?

Using interrupts may just be overcomplicating the application. Could you just pool the I/O line in question in your main loop?

Steve