using Interrupts.... - Electronic Circuits Projects Diagrams Free

striker2509 · 7th June 2005, 08:18 PM

How can i set the port b as an interruption....i want to take tha value in that port everytime i change a input pin....help me please!

DTMF · 7th June 2005, 08:41 PM

you must specify on wich PIC do you work? :?:

but there is a special source of interruption for PORTB

1st on pin0

2nd on changes at B port

i think you must enabel all interrupt & set correctly the "INTCON" register
i am not about the register nam

& olso set the interrupyion vector on 0x04 EX:
org 0x04
goto interruption

interruption is the label of the sub routin for reading portb

i will give you more details after i chek the DATASCHEET

**Jay.slovak** · 7th June 2005, 08:46 PM

Try Nigels tutorials :

PIC programmer software, and PIC Tutorials at:
http://www.winpicprog.co.uk or
http://www.lpilsley.uklinux.net/picprog

It should solve whatever your problem is.

striker2509 · 7th June 2005, 09:45 PM

Quote:

Originally Posted by striker2509

How can i set the port b as an interruption....i want to take tha value in that port everytime i change a input pin....help me please!

sorry about that...im using pic16f877, i tried to interrupt through rb4-rb7 pins...and didn't work out....dont know what i did wrong

Pommie · 8th June 2005, 02:27 AM

Just enable the interrupts with.

Code:

            bsf    INTCON,RBIE
            bsf    INTCON,GIE

In your interrupt you need to read port b before resetting RBIF
I.E.

Code:

            movfw  PORTB
            bcf    INTCON,RBIF

HTH

Mike.

Edit, you will only get an interrupt if a change happens to any of the b4 - b7 bits that are inputs, not outputs. Note also, the datasheet doesn't mention RBIE in the description under PORTB - only RBIF.

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7th June 2005, 08:18 PM	(permalink)
striker2509	using Interrupts.... How can i set the port b as an interruption....i want to take tha value in that port everytime i change a input pin....help me please!

7th June 2005, 08:41 PM	(permalink)
DTMF	you must specify on wich PIC do you work? :?: but there is a special source of interruption for PORTB 1st on pin0 2nd on changes at B port i think you must enabel all interrupt & set correctly the "INTCON" register i am not about the register nam & olso set the interrupyion vector on 0x04 EX: org 0x04 goto interruption interruption is the label of the sub routin for reading portb i will give you more details after i chek the DATASCHEET __________________ digital-electronics

7th June 2005, 08:46 PM	(permalink)
Jay.slovak	Try Nigels tutorials : PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk or http://www.lpilsley.uklinux.net/picprog It should solve whatever your problem is. __________________ "I share, thus I am" Jay.slovak Read this! ICD2 Clone Best PIC/DsPIC Bootloader Read my Inchworm ICD2 review!

8th June 2005, 02:27 AM	(permalink)
Pommie	Just enable the interrupts with. Code: bsf INTCON,RBIE bsf INTCON,GIE In your interrupt you need to read port b before resetting RBIF I.E. Code: movfw PORTB bcf INTCON,RBIF HTH Mike. Edit, you will only get an interrupt if a change happens to any of the b4 - b7 bits that are inputs, not outputs. Note also, the datasheet doesn't mention RBIE in the description under PORTB - only RBIF.