DT_instantINT 16f690 not working... what am I doing wrong?

[Heckler]

Thanks Hank...
I added what you suggested and it is working better... BUT LED0 is still not ON fully when it is on. I looked at it with an O-scope and it is actually a square wave at 2.9 KHz... which makes me think it is constantly re-triggering the interrupt at that 2.9KHz rate (or something??)

Here is my code as it stands...

#CONFIG
  __CONFIG _INTRC_OSC_NOCLKOUT & _WDT_OFF & _PWRTE_OFF & _MCLRE_OFF & _CP_OFF & _CPD_OFF & _BOD_OFF & _IESO_OFF & _FCMEN_OFF
#endconfig


include "ALLDIGITAL.pbp"
INCLUDE "DT_INTS-14.bas"        ; Base Interrupt System
INCLUDE "ReEnterPBP.bas"        ; Include if using PBP interrupts

wsave   VAR BYTE    $70 SYSTEM  ' alternate save location for W 

DEFINE OSC 4

TrisA = 00000000
TrisB = 00000000
TrisC = 00000000
OPTION_REG.7=0        'Turn On weak pull ups
WPUB.7 = 1

LED0   VAR  PORTC.0   'this LED is controlled by the "INT" pin, 16F690=RA2
LED1   var  PortC.1   'this LED is controlled by the Main program loop
IOC_FLAG VAR INTCON.0

IOCB.7=1
 
ASM
INT_LIST  macro    ; IntSource,        Label,  Type, ResetFlag?
        INT_Handler    RABC_INT,  _ToggleLED1,   PBP,  yes
    endm
    INT_CREATE               ; Creates the interrupt processor
ENDASM

IOC_FLAG = 0
@   INT_ENABLE   RABC_INT     ; enable external (INT) interrupts

Main:
  PAUSE 500
  Toggle led1
GOTO Main

'---[INT - interrupt handler]---------------------------------------------------
ToggleLED1:
IOC_FLAG = 0
toggle LED0

@ INT_RETURN

Also... i am using a pulse generator that allows me to generate 1,10,100,1000 Hz and that is what I am using to feed RB7 (the source of the INT)

I have looked at the pulse signal feeding the INT and it is clean.

anyone?

PS. when you post code to the forum it seems to not like "%" and deletes some of the bits after the %. There are %'s in my actual code.

[HenrikOlsson]

Hi,
When using the Interrupt On Change feature you must read the pins in interrupt handler in order to end the mismatch condition. You're not doing that as far as I can see so the interrupt refires as soon as it exits which is why you get the 2.9kHz squarewave output.

/Henrik.

[Heckler]

Henrik... BINGO!

Go get yourself a doughnut... (or whatever sweet treat you good people of Sweden like to enjoy at celebrations!)

that was it...

I just added this line to my INT handler...

'---[INT - interrupt handler]---------------------------------------------------
ToggleLED1:
myvar = PortB
IOC_FLAG = 0
toggle LED0

@ INT_RETURN

And now I have 2 LED's blinking at different rates, one controlled by the rate of the INT, the other at a fixed rate controlled by the PAUSE command in the Main program loop.

I spent a couple of hours testing and troubl shooting and pulling my hair out... on this last evening. Why? was it for a special important project? NO... I just wanted to get my brain around the DT INT's and be able to use them and under stand them. My signature line really says it for me.