Instant Interrupts Questions

[Darrel Taylor]

This might help with the printer part...
http://www.picbasic.co.uk/forum/showthread.php?t=218
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[jheissjr]

I would like to use the 18F because it has a large amount of RAM and code space. Other wise I agree, I would be using a 16F. Would you mind releasing the 'governed' version of what you have so far.

[modifyit]

Is the INT_INT interupt the pin B0 interrupt? If so, does the interupt trigger on the falling or rising edge?

In the example I am working with I am using an 16F877a

Thanks

[Darrel Taylor]

Yes, that's the pin.

By default, it interrupts on the Rising Edge. But it depends on the INTEDG bit in the OPTION_REG.

OPTION_REG.6 = 0 ' INT on Falling Edge
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[modifyit]

So do I just put the register declaration right after the inlcude file definitions or do I need to imbed it in your files some how? I'm looking to triger based on a falling edge.

Thanks again

[Darrel Taylor]

As long as you put it somewhere before the @ INT_ENABLE INT_INT you should be OK.

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[modifyit]

So using your example I should put the option_reg declaration where I have it in your example below if I want the interupt to occur on the falling edge? I will try this tonight thanks alot!

LED1 VAR PORTB.1

INCLUDE "DT_INTS-14.bas" ' Base Interrupt System
INCLUDE "ReEnterPBP.bas" ' Include if using PBP interrupts

 OPTION_REG.6 = 0 ' INT on Falling Edge 

ASM
INT_LIST macro ; IntSource, Label, Type, ResetFlag?
       INT_Handler INT_INT, _ToggleLED1, PBP, yes
endm

INT_CREATE ; Creates the interrupt processor

INT_ENABLE INT_INT ; enable external (INT) interrupts

ENDASM

Main:
PAUSE 1
GOTO Main

'---[INT - interrupt handler]---------------------------------------------------
ToggleLED1: 
    TOGGLE LED1
@ INT_RETURN