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I don’t know where you got that code, but it’s just wrong. There is no start_render or print_str methods in the API.
Download the most current TVout from the web site and look at the examples and the API.I don’t understand your design. Are you trying to do VGA or Composite video using TVOut?
TVOut generates the signal on digital pins 7 and 9. You don’t even have those pins connected in your design. How did you expect it to work if you didn’t connect the pins?I just followed the design that the TVout guy proposed, except used a 330 ohm instead of a 470 ohm. I also put a diode on each line. The 75 ohm resistor is generally not needed because there is 75 ohms of resistance in the TV between the composite input and ground.
The details of how to use TVOut are here: http://code.google.com/p/arduino-tvout/
It’s unlikely that a shield as complicated as the Ethernet shield can be driven at the same time as the Video Experimenter. Most shields are not compatible with one another because of interrupts and timers. The VE requires use of timers and constant interruption with very precise timing to generate the video.
The overlay code is not designed for resolutions higher than the default. With such a slow microcontroller, there are only 6 instruction cycles to process each pixel. Higher resolutions just are not possible with the overlay. I can’t do the overlay any faster than it is. Higher resolution would require each pixel to be processed in 5 or 4 instruction cycles, and it just can’t.
You can’t use Serial output while generating video. Use the pollserial library that comes with the TVout library. If the microcontroller is being forced to handle serial communication interrupts, then it will interfere with the video.
You can go up to 192×128 or maybe higher with the Seeeduino Mega.
No, an external memory expansion would not help. You can’t access the memory fast enough. The video generation code is written in assembly, and it can’t be made any faster.
No, the simple Video Experimenter cannot do that. Not even close.
We are at nootropicdesign.com, of course.
We have a store: http://nootropicdesign.com/storeNo, it’s only for the Arduino Uno and Duemilanove. I’ve been very clear about what boards are supported, but everyone keeps trying to use it with different hardware!
Well, I really can’t teach people how to code if they have no experience. If you are able to compile the Defusable Clock firmware in Arduino and upload code, then I can tell you the few lines of code you may need to change.
Yes, that can be done. An LED pin can be repurposed, or one of the pins on the 6 pin header at the top of the board. Special coding is required but it is easy.
No bother at all. Yes, it would be great to use that fast processor for video. You would have to port the TVout code to PIC, though. The guts of the TVout code are written in AVR assembly, so it would be a significant undertaking, but should be possible. Look around and see if anyone has done composite video generation for that processor.
