Thinking about STMUzebox

Discuss anything not related to the current Uzebox design like successors and other open source gaming hardware
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Re: Thinking about STMUzebox

Post by HardlyUnique » Wed Mar 21, 2012 2:11 am

Good point; I like the way you think! :D

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Re: Thinking about STMUzebox

Post by Ringo888 » Thu Mar 22, 2012 11:32 am

As WAHa.06x36 has pointed out if the combined resistance of the R2R DAC is 75R, then theres no need for an additional 75R termination resistor to ground. If you were to add a 75R resistor in parallel (output-ground) with the total resistor DAC network of 75R, you would divide the total source impedance by R/2 to give 37.5R which wouldn't match the load impedance on the TV.

Impendance matching is used to reduce any signal degradation and reflections on data lines (RF, digital or otherwise).

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Re: Thinking about STMUzebox

Post by WAHa.06x36 » Tue Mar 27, 2012 8:23 pm

Just updated the repo with a driver for the audio codec, which is hopefully less terrible than the one STM provides. It is not entirely tested so there might be bugs in the parts that are not used in the test program (like powering down and up the codec), but it should sort of work, at least.

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Re: Thinking about STMUzebox

Post by WAHa.06x36 » Fri Apr 06, 2012 3:32 pm

So! Me and some friends have just turned in our production for the Revision 2012 demo party wild compo, and it's a demo running on the STM32F4.

The actual compo is happening at 17:30 CET on Sunday, April 8. There are live streams running all weekend here:

There's lots of other compos worth watching too, so check out the timetable here:

So, keep an eye out for "Peridiummmm" by SVatG in the wild compo! And if you miss it, we'll be putting up videos, binaries and source code after the compo is over.

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Re: Thinking about STMUzebox

Post by WAHa.06x36 » Sun Apr 08, 2012 5:31 pm

Well, the compo is over! Results will be in tomorrow sometime.

Meanwhile, for those who missed it:

Beware that the source code contains DEMO CODING and is NOT GUARANTEED TO BE SAFE, even for LOOKING AT. I'll update my repository with slightly updated and modified versions of the VGA code used in this demo later.

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Re: Thinking about STMUzebox

Post by JRoatch » Mon Apr 09, 2012 4:30 am

That is awesome. I really enjoyed it. Well done.
The best thing I like about the demoscene is demonstrating the capabilities of hardware previously thought to be too limiting.

As for the code...
Besides having most of the data as code in plenty of places, on the surface it looks pretty well written and organized.

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Re: Thinking about STMUzebox

Post by greenpower » Wed Apr 11, 2012 6:34 pm

WOW! It's a ginormous 8bit/16bit audio-video explosion! I fucking love it! It reminds me of some demos from the AMIGA demoscene and various, but BTW keep doing this amazing stuf! :D
I know i'm too young, but it doesn't matters. Maybe i'm a newbie, but i can learn very fastly

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Re: Thinking about STMUzebox

Post by uze6666 » Thu Apr 12, 2012 12:00 am

Agreed, pretty awesome, nice work!! It show what that little beast is capable of... :mrgreen:


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Re: Thinking about STMUzebox

Post by hpglow » Wed Apr 18, 2012 4:19 am

Kick ass! Good work.

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Re: Thinking about STMUzebox

Post by Dirt.Diver » Fri Apr 27, 2012 8:01 am

This demo is awesome -

I just got a stm32f4 discovery board because I the demo. I wanted to use the code as a jumping off to learn the demoscene techniques. I have not wired up the r2 vga ladder yet, but I was able to build the tool chain and compile your code. I did have to make a slight change to the Makefile for CC = arm-none-eabi-gcc and for LD also.

I did get it to fully build, and I flashed it with

st-flash write VGA.bin 0x08000000

It seems to have flashed properly, but when I repower the unit, I dont see any led activity or hear any audio from the speaker jack. Would anyone have any ideas on where I might have gone wrong? Any help you be appreciated.


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