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 #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
Hi all. I am looking into the possibility of using an overclocked PIC 12F675 as a basic video A-D to generate false colour video.
The plan so far is to have it encode everything during the 5uS vertical pulse and "play it back" during the 52us video waveform., having generated the colour burst, h sync, vsync and suchlike on separate pins with a 17.734 MHz clock (/4=4.433618)
Using basic encoding techniques I can get as many as 498 horizontal pixels if I clock it right, however I can't possibly encode that many in realtime.
I am setting the luminance at 100% as encoding both at once is very tricky so it will be saturated colours only (which limits me to RGB, yellow, purple and violet, same as a TEA2000)
Any ideas? I was looking into encoding the video during the waveform but it will mess up the timing.
The other plan is to encode the output directly to feed to an MC1377 which somewhat frees me from timing constraints as i don't need the LM1881 or to generate syncs (and I can also delay the luminance signal in software)
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
I looked into the possibility of using a potato as a quantum supercomputer once. It's about as well suited to the purpose as a low-end PIC is to generating video.
Nevertheless, there are people out there who have nothing better to do than code Pong and Space Invaders on PICs with output on a TV set. A Google search will turn up more info and example code.
Registered Member #1739
Joined: Fri Oct 03 2008, 10:05AM
Location: Moscow, Russia
Posts: 261
On a bit of offtopic, but I don't want a new thread on this, also doubt anyone else wants - had anyone tried an MP3-decoding on an AVR chip? I mean not forwarding it onto some external decoder, but actual MP3 software decoding. If that's possible, you can make a player twice smaller then commercial devices!
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
I don't know of anything smaller than ColdFire or ARM sized that can decode MP3. If it was possible to make an MP3 player "twice as smaller", I'm sure some Chinese company would have done it already, and twice as smaller would just be normal sized, if you see what I mean.
My old iRiver (with a 140MHz ColdFire) can do mp3 and ogg fine, but used to struggle with AAC. I think Rockbox optimized the AAC decoder more, but I don't have any AACs to test it with.
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.
Run a PIC as a video A-D?
