[sdiy] (OT)help processing realtime audio on Arduino?

[dan snazelle]

can anyone recommend a source for understanding things like CBI, SBI, timers, etc?
other than just the AVR datasheet? are these universal terms which i will find outside of the avr world? I did buy a book that aaron lanterman recommended on more general programming concepts
but I HQBWNR 																


i suppose that just like all the arduino terms i have been starting to learn, this code wouldnt seem as hard if i knew what some of the stuff meant.
but right now, there is little in that article's code that is obvious.

everyone recommends this article though. i played around with the actual code on saturday....seeing what it could do. interesting...however it was certainly not high fi


i am still trying to figure out if this chip is going to be able to handle any of the tasks i want it to handle or if i should start looking into something more powerful like a dspic or a 
16 or 32 bit pic.

but this seems hard enough for now and certainly fun!!!

thanks





On Feb 1, 2011, at 3:19 PM, Olivier Gillet wrote:

>> I had a read-through of that LAB3 article, and it's not *too* bad. Although I didn't understand why the set a timer up at 62.5KHz and then only used every other interrupt to read an audio sample. Perhaps the ADC is slow.
> 
> The timer pre-scaler is coarse, it is set by increments of 8 IIRC.
> Though you can use phase accurate PWM instead of fast PWM in which
> case the interrupt rate is divided by two and you'll get 31.25kHz. See
> the ATMega328p datasheet.
> 
>> Maybe i need a book not on arduino but on the AVR!
> 
> The arduino library (digitalWrite, analogRead) has a huge overhead
> (these are functions - run-time abstractions - not macro or templates
> - compile-time abstractions) and favors blocking I/O. It is not
> appropriate for audio coding, so you have to dig into the "low level"
> stuff.
>