I need help with Interrupt

**wildbilly** · - 1st September 2007, 01:41

Hi Dave thanks for your help. I have tried your suggestions and still have the same problem. I even copied your code directly and still no fix. You said you have it counting. I can only get it to count to one and then it stops. You said when you pushed the button to ground, it would count. Did you have it counting pass one? Another thing is the Option_Reg bit 6 is set for "Rising edge". You said you pushed the button low. It should not work if the bit is set for rising edge.
I guess I should also disclose that I am using the "EasyPic4 Development Board". I wonder if that is my problem.

**mackrackit** · - 1st September 2007, 11:56

If you want it to interrupt when RB0 goes high, comment out the OPTION_REG line and use external resistor from RB0 to ground.

With the OPTION_REG set as you have it "pull-up""set" the pin will need to go LOW to trigger the interrupt. No external resistor.
From data sheet.

External interrupt on the RB0/INT pin is edge triggered,
either rising, if bit INTEDG (OPTION_REG<6>) is set,
or falling, if the INTEDG bit is clear.

I counted to 255 then of course it rolls back to 0 and starts over.

I guess I should also disclose that I am using the "EasyPic4 Development Board". I wonder if that is my problem.

Not sure, never used the "EasyPic".

I am using Ubuntu (linux) for an OS, running MPLAB with PBP as the language set via Wine hooked to a PICSTART PLUS rigged as an ICSP.

**wildbilly** · - 1st September 2007, 18:46

Thank for you suggestion JOE.S I will have to try the other Inputs as well, 4-7. Thank you to mackrackit. I have found the problem. There is a jumper on the board that was set for "Pull down" and I had the "Pull up" set in Option_Reg. They were fighting each other. I disabled the Option_Reg and it works very well. Thanks very much for your input. All that you said was spot on.

This is fun.
Wildbilly.