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

[dan snazelle]

it looks like all the arduino books i have dont cover any of these strange functions (CBI, SBI, etc)

So i have been looking at a few books tonight on amazon which are C for AVR sort of books

there is one by Joe Pardue and a few others...Programming Microcontrollers in C, Second Edition
Embedded C Programming and the Atmel AVR,etc

can anyone recommend a good C for AVRS style of book?

( i already have PLENTY of good books on C but they dont go into how to apply that to an AVR chip



thanks


On Feb 1, 2011, at 4:16 PM, Stewart Pye wrote:

> Hi Dan,
> 
> Have you looked at the AVR instruction set? I think it's more detailed than what's in the datasheets...
> www.atmel.com/dyn/resources/prod_documents/doc0856.pdf
> 
> 
> Stew.
> 
> 
> 
> 
> 
> dan snazelle wrote:
>> 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.
>>> 
>>>    
>> 
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> 
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