ATMEL Audio DSP documentation?

egnouf

hello!
I am a newbie ;-)

I am looking at the lxr code as later I am hopping to have enough knowledge (and time) to modify the code :-)

If i look at the distortion code, this block calls an external function.... coming from the DSP lib ?
I suppose that I should look at the atmel DSP documentation API, isn't it?

if so,
where can I found some docs about it?
I am lost with google search!

cheers!

PS: I did not yet compiled the code on my local machines, do you advice me to start with that? perhaps eclipse install some documentations about the audio DSP of ATMEL?

julian

All the audio processing is done on the mainboard on an ARM chip, the STM32F4.
The Atmel AVR is only handling the frontpanel.

I just had a look again at the distortion code. But i can't find any calls to the DSP lib.
There are intrinsic functions used at some places.
These begin with the double underscore '__'
Most of the times these are saturating instructions like __SSAT()
which only means they won't overflow.

a google search for those, for example "ARM __ssat" will bring you to the arm developer center where all those intrinsics are explained. http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0491c/BABJCEBD.html

egnouf

thanks !
I will start looking at that :-) it gives me good direction to understand the code!
:-)