AVR-Chat

Hi Donald,

> Please understand the basics of what you want to do, then code.
> I think this may help you.
> http://www.avr-asm-tutorial.net/avr_en/AVR_DAC.html

Thanks for the link. Unfortunately it has little to do with my main
issue, which was about how to write timer-based, interrupt-driven
code for the AVR in C. The actual signal generation (as described
in the above article) is the easy part!

I find it interesting, however, that the code on the page you mentioned 
seems to have limits similar to the ones I have been running into:
1800Hz for a 256-sample sine wave at a 4MHz clock speed translates to
roughly 61 cycles per sample, which does not leave a lot of room for
anything else. (In an interrupt-driven solution, a few more cycles are
burnt to preserve machine state).

It does leave me curious about how Leon managed to generate 200kHz
sine waves on a 12 MHz AVR- that would seem to only leave 30 cycles
per sample (and at that point the signal would really be a square wave 
rather than a sine wave).

Unless there was some other hardware-assisted trick at work there.
The question is if that 'trick' would be of any help for polyphonic
audio.

Leon, care to comment?

Best,
Marc