Darrel Taylor - Instant Interrupts-Problem 16F877A

[Megahertz]

.... if all you want to do is restart the program after an interrupt, then you don't even need interrupts.

Well, I don't think I can manage without interrupts. In my code the program waits for serial data on one pin from an RF receiver. And if RI pin of my modem attached to RB0 pin goes low, the code should check any sms received as well. So, interrupt is needed.

Once enabled, interrupts will continue to fire.
They do not need to be enabled again, unless manually DISABLED in your program.

How I can do that-disable the interrupts (Is it by adding DISABLE before the code) ? and also can they be enabled again when needed by using @INT_ENABLE?

Regards

[Darrel Taylor]

ENABLE and DISABLE have no effect with DT_INTS.
Those are only for ON INTERRUPT.

With DT_INTS there are two commands ...

@  INT_ENABLE  TMR1_INT
@  INT_DISABLE  TMR1_INT

They can be used anywhere in your program.
Once disabled, you will not receive any interrupts from that source or peripheral until you execute another @ INT_ENABLE.

When you INT_ENABLE, the flag is automatically cleared so you don't get an interrupt immediately if the flag was set.
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[Megahertz]

Thanks for the quick relply, just some last bit of confusion left:
1) When interrupt will happen while waiting for an RF signal - How do I send the code to go from ISR to main label?

2) Can I disable the interrupt in the ISR? for eg:

_ToggleLED:
@INT_Disable
goto main
@INT_Return ' Should I use this if I am sending the code to another label?

[Darrel Taylor]

How do I send the code to go from ISR to main label?

Like I said before.
You should NOT jump out of an interrupt handler to the main loop.
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[Megahertz]

Hello Darrel
I am using the interrupts on 12F635 for a different program now and I am getting the following errors:

Executing: "C:\PBP\PBPW.EXE" -ampasmwin -oq -z   -p12F635 "TxRx.bas"
PICBASIC PRO(TM) Compiler 2.50b, (c) 1998, 2008 microEngineering Labs, Inc.
All Rights Reserved. 

ERROR: Variable wsave3 position request 416 beyond RAM_END 127.
ERROR: Variable wsave2 position request 288 beyond RAM_END 127.
ERROR: Variable wsave1 position request 160 beyond RAM_END 127.
ERROR: Unable to fit variable wsave
ERROR: Unable to fit variable RS1_Save
ERROR: Unable to fit variable RS2_SaveHalting build on first failure as requested.
BUILD FAILED: Thu Dec 31 14:13:38 2009

Any advise as to how to get rid of these?
I am trying to put interrupts for getting proper timeout for Serin command, is it a good way to it? Thanks for your help.