Interrupt mystery - need some guru help

[skimask]

Please, no more riddles.

There's only one riddle...why haven't you read the section I specified earlier?
It's right there in the datasheet...Section 4.2.3, 2nd paragraph.

[xnihilo]

There's only one riddle...why haven't you read the section I specified earlier?
It's right there in the datasheet...Section 4.2.3, 2nd paragraph.

I did.
Never mind, I will ask in another forum.

I think the problem comes from the fact that my RA3 is linked to nothing. I will connect it to 5V via a 10K resistor.

[skimask]

Never mind, I will ask in another forum.
I think the problem comes from the fact that my RA3 is linked to nothing. I will connect it to 5V via a 10K resistor.

Hey, I'm just trying to help you learn how to read a datasheet...or at least read between the lines in a datasheet. Some of the information is a bit subtle.
And yes, it's a distinct possibility that a floating input could be triggering something it shouldn't.

[mbruno]

Re-Read the replys the Clue to solve your mystery is "I.O.C."...
hopes this helps just a little

[BobP]

Hi xnihilo,

Don't get upset! We are only trying to help.

A lot of posts the user just wants the answer without learning the ways of Microchip and the PIC's. They learn how to solve that problem but not how to understand the datasheet.
Don't get me wrong, I have spent hours pulling out my hair and after posting the problem it turns out to be a simple mistake that I have made. We are all human.

The important part of the datasheet is this bit,

'For enabled interrupt-on-change pins, the values are
compared with the old value latched on the last read of
PORTA. The ‘mismatch’ outputs of the last read are
OR’d together to set the PORTA Change Interrupt Flag
bit (RAIF) in the INTCON register (Register 2-3).'

The following tip is the last I can give. The next step is to write the program for you!

Read the port before enabling the interupt!!!

Regards,
Bob

[mbruno]

A little more help. remember if any pins change state the RAIF is set in the INTCON register, you must end any mismatch on the port first then reset the RAIF bit. Can't be much more clear than this

Mike

[xnihilo]

Hi xnihilo,

Don't get upset! We are only trying to help.

A lot of posts the user just wants the answer without learning the ways of Microchip and the PIC's. They learn how to solve that problem but not how to understand the datasheet.
Don't get me wrong, I have spent hours pulling out my hair and after posting the problem it turns out to be a simple mistake that I have made. We are all human.

The important part of the datasheet is this bit,

'For enabled interrupt-on-change pins, the values are
compared with the old value latched on the last read of
PORTA. The ‘mismatch’ outputs of the last read are
OR’d together to set the PORTA Change Interrupt Flag
bit (RAIF) in the INTCON register (Register 2-3).'

The following tip is the last I can give. The next step is to write the program for you!

Read the port before enabling the interupt!!!

Regards,
Bob

Come on! I know i sound stupid but i am not.
i DO read porta bits individually prior to enabling intcon, even if i maybe didn't mention it.
the int occurs anyway. when i outout the state of porta at the begining of interrupt routine 2 strange things can be noticed. it seems it is ra3 that triggers the interrupt. however i used the same program structure for another project and i didn'have such problem. even if the ra3 was left floating.
second thing: porta.5 value is not what it is supposed to be. with no wpu and set low with trisa, it is high when interrupt occurs. dammit.

the complete source code is at:
http://users.edpnet.be/charlesetchri...g/se210308.pbp

[Acetronics2]

Hi,

I do hate war games ... ( except the film ...) BUT

FOR i = 0 to 5
    aport[i] = porta.0(i)       'mirror the pins states into the array
NEXT i

Are you really sure of those lines ... ???



Alain

PS

    IF dead == 1 THEN finish    'if player is already dead, don't answer and leave the int routine

Ha,ha,ha ... YOU 're dead !!!

Re-PS

The PICs control transistors that drive relays for 9V supply to nichrome wires for the physical feedback. 
One cm of 38ga Nichrome wire, with 9V and a 6 ohms resistor is heated for 500ms, inducing a little burn that will leave a very tiny scar similar to cat's claw scratch.

And overall sado-maso games ...

WHAT A PITY !!!

[skimask]

The important part of the datasheet is this bit,
'For enabled interrupt-on-change pins, the values are
compared with the old value latched on the last read of
PORTA. The ‘mismatch’ outputs of the last read are
OR’d together to set the PORTA Change Interrupt Flag
bit (RAIF) in the INTCON register (Register 2-3).'

i DO read porta bits individually prior to enabling intcon, even if i maybe didn't mention it.

(from Sesame Street)...
One of these sentences...is not like the other...