Arduino Due and AD725 How-to?

Question

Is there a good resource for getting started with the AD725 (or AD724) and the Arduino or Aduino Due? I need to make a gui (possibly using bitmaps) that outputs s-video and composite.

Thanks in advance

michaelkellett · Answer

The Atmel ARM processor in the Due does have DMA but as far as I can tell it can't DMA from memory to a GPIO port so it won't help make video signals. To work out if the processor is fast enough you need to do some experiments and you will need to to do a LOT of work. I don't think you are going to find the kind of examples you want on the web. On the Uzebox wiki is an explanation document that I expect you have seen but if not its at: Main Page - Uzebox "How it works (PDF" The actual code, like most open source code, is not very well documented and so is very difficult to understand - if it were my project I wouldn't bother attempting a "port" because the ARM processor is so different from the AVR. The How it works doc tells you pretty much how to do it. You will need an oscilloscope (well it will make things a lot easier) to get it working. You could start by connecting the resistor network to an IO port on the Due (pick output pins 0-7 if possible) connecting up the converter chip and start writing code snippets. The easiest way to do the hardware would be to take the processor out of a Uzebox board and hook up to that (watch out for 3.3V to 5V issues). MK