If you need assistance, please send an email to forum at 4hv dot org. To ensure your email is not marked as spam, please include the phrase "4hv help" in the subject line. You can also find assistance via IRC, at irc.shadowworld.net, room #hvcomm.
Support 4hv.org!
Donate:
4hv.org is hosted on a dedicated server. Unfortunately, this server costs and we rely on the help of site members to keep 4hv.org running. Please consider donating. We will place your name on the thanks list and you'll be helping to keep 4hv.org alive and free for everyone. Members whose names appear in red bold have donated recently. Green bold denotes those who have recently donated to keep the server carbon neutral.
Special Thanks To:
Aaron Holmes
Aaron Wheeler
Adam Horden
Alan Scrimgeour
Andre
Andrew Haynes
Anonymous000
asabase
Austin Weil
barney
Barry
Bert Hickman
Bill Kukowski
Blitzorn
Brandon Paradelas
Bruce Bowling
BubeeMike
Byong Park
Cesiumsponge
Chris F.
Chris Hooper
Corey Worthington
Derek Woodroffe
Dalus
Dan Strother
Daniel Davis
Daniel Uhrenholt
datasheetarchive
Dave Billington
Dave Marshall
David F.
Dennis Rogers
drelectrix
Dr. John Gudenas
Dr. Spark
E.TexasTesla
eastvoltresearch
Eirik Taylor
Erik Dyakov
Erlend^SE
Finn Hammer
Firebug24k
GalliumMan
Gary Peterson
George Slade
GhostNull
Gordon Mcknight
Graham Armitage
Grant
GreySoul
Henry H
IamSmooth
In memory of Leo Powning
Jacob Cash
James Howells
James Pawson
Jeff Greenfield
Jeff Thomas
Jesse Frost
Jim Mitchell
jlr134
Joe Mastroianni
John Forcina
John Oberg
John Willcutt
Jon Newcomb
klugesmith
Leslie Wright
Lutz Hoffman
Mads Barnkob
Martin King
Mats Karlsson
Matt Gibson
Matthew Guidry
mbd
Michael D'Angelo
Mikkel
mileswaldron
mister_rf
Neil Foster
Nick de Smith
Nick Soroka
nicklenorp
Nik
Norman Stanley
Patrick Coleman
Paul Brodie
Paul Jordan
Paul Montgomery
Ped
Peter Krogen
Peter Terren
PhilGood
Richard Feldman
Robert Bush
Royce Bailey
Scott Fusare
Scott Newman
smiffy
Stella
Steven Busic
Steve Conner
Steve Jones
Steve Ward
Sulaiman
Thomas Coyle
Thomas A. Wallace
Thomas W
Timo
Torch
Ulf Jonsson
vasil
Vaxian
vladi mazzilli
wastehl
Weston
William Kim
William N.
William Stehl
Wesley Venis
The aforementioned have contributed financially to the continuing triumph of 4hv.org. They are deserving of my most heartfelt thanks.
Registered Member #1451
Joined: Wed Apr 23 2008, 03:48AM
Location: Boulder, Co
Posts: 661
Ok i'm stumped with this... I'm using a PIC16f690. I'm trying to use TIMER2 to generate an interrupt when ever it matches the PR1 value. This will be used to toggle a pin at around 20kHz in order to drive a flyback. The problem is, no matter what I do, I can't seem to get the code to jump to the interrupt routine! I've set all the bits to enable everything but it's just not working. I know the interrupt routine works as I can set it to interrupt on a pin change and it all works great. I also know the timer is working as I can simulate the code and the interrupt flag bit gets set at the right time and everything. Below is a little bit of the code that I'm using, the important part anyway.
Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
The short answer is that if it does not call the interrupt vector you set it up wrong. Without the rest of the code we have no idea what you did wrong.
Since the chip has a PWM module it can do what you need in hardware which is simpler and more reliable so why not do that instead?
Registered Member #1451
Joined: Wed Apr 23 2008, 03:48AM
Location: Boulder, Co
Posts: 661
I need it to run in the background, does the PWM do that? I mean that i can't have it constantly going through delay loops. The code is kinda confusing at the moment because i have goto's isolating the part i'm having problems with, so I'm not going to post it until i clean it up. I know i set bit 6&7 of the INTCON register and bit 1 of PIE1... Also TIMER2 is set to run of the clock and that works great... INTCON is listed in all the banks, does it matter which one i go to to set it? I know that PIE1 is in bank 1, so I just set the INTCON bits there. Am I I supposed to clear the register before setting bits to initialize it or something?
Registered Member #65
Joined: Thu Feb 09 2006, 06:43AM
Location:
Posts: 1155
I have not dealt with the 16x690, but I do know a few other chips.
* The init vector is often org 0, but may be in other places depending on the chip * The reset vector may also move * Some PICs only have the interrupt on TMR0 overflow * Some have buggy priority interrupt hardware (18f series) * PWMs are generally better than interrupts, as you don't have to count machine cycles (configure internal period & duty, and setup io/module)
The jump vector label BEGIN: skips most of your init code (unless you are modifying the PC directly someplace else.)
This site is powered by e107, which is released under the GNU GPL License. All work on this site, except where otherwise noted, is licensed under a Creative Commons Attribution-ShareAlike 2.5 License. By submitting any information to this site, you agree that anything submitted will be so licensed. Please read our Disclaimer and Policies page for information on your rights and responsibilities regarding this site.
PIC Interrupts
