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Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
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.
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Run a PIC as a video A-D?
