Symphony Soundbite Documentation

[AndyCapon]

Hi Guys,

I have downloaded all the documentation from http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=SYMP_SOUNDBITE&fpsp=1&tab=Documentati...

It seems to be lacking much detail about the board itself, for example in the reference doc we have:

"There is no automatic hardware detection of the input source type; all detection and source selection is

 done using application software in the DSP to program the appropriate registers of the AK4584 codec

 (U5). For more information about the setup and programming of the AK4584 codec (U5), see the

 associated materials in the Symphony SoundBite documentation"

Where exactly is this other documentation as it is not on the download page?

Any help would be really apreciated

All the best

Andy

[clangen]

Hi Andy,

this isn't really obvoious: The AKM4585 codec has to be configured to feed the optical input to the DSP. The configuration is done in the main.asm program at the label

STRAIGHT                        ; pass through all codecs' inputs independently
    move #>$12,y0                ; ak4584 Audio sources:  ADC > SDTO, STDI > DAC, DIR > DIT

To understand what to do here you have to read the AKM4585 documentation, see:

http://www.asahi-kasei.co.jp/akm/en/product/ak4584/ak4584_f00e.pdf

On p. 43 you see the meanings of the bits in register 08h that is configured for the input source selection:

12h feeds the optical input to the optical output directly and feeds the ADC input to the DSP. To use the optical inout signal you have to change this.t0 16h.

I will do some experiments using the SoundBite board and give you a report later...

Best regards

Christian

[clangen]

Hi Andy,

here is the configuration to tunnel the spdif in to the DSP that ouputs the processed signals to both analog and spdif.

STRAIGHT                        ; pass through all codecs' inputs independently

;    move #>$11,y0                ; ak4584 Audio sources:  ADC > SDTO, STDI > DAC, SDTI > DIT

    move #>$19,y0                ; ak4584 Audio sources:  DIR > SDTO, STDI > DAC, SDTI > DIT

Best regards

Christian

[wannabee]

This really gives me a kickstart!Works! Thank You!

  move #>$19,y0

did the trick to get SPDIF to play in analog output.

OK.

http://www.asahi-kasei.co.jp/akm/en/product/ak4584/ak4584_f00e.pdf page 42 has to be carefully considered.

I have still lofs of problems with ASM because this is my first such a project.

But I have pretty clear goal.That is to build different style of crossovers with this(these) chip(s).

I very much understand that complaining from this newbie point.

This Sounbite by the way has an excellent sound if the USB

is plugged off. On the other hand with USB the noise is significant if not disturbing.It can be mostly overcome with adding gain to source.

[AndyCapon]

Hi Christian,

Thanks very much for the useful info.

So is the best way of understanding the board to just look through the two samples then?

I have had a look at the schematic and the ref manual but there seems to be quite a bit of lacking info!

Thanks

Andy

[clangen]

Hi Andy,

yes indeed, you have to study

http://cache.freescale.com/files/dsp/doc/user_guide/SNDBASMTMPL.pdf?fpsp=1&WT_TYPE=Users%20Guides&WT...

and

http://cache.freescale.com/files/dsp/doc/user_guide/SNDBDMOUG.pdf?fpsp=1&WT_TYPE=Users%20Guides&WT_V...

carefully. Anyway there's lot of ducumentation lacking that you have to figure out on your own unfortunately. Reading the schematic may help as well to understand the SoundBite architecture.

Best regards

Christian

[AndyCapon]

Hi Christian,

Thanks for the info, it's a shame they haven't documented the board a bit more!

It is cheap though

Cheers

Andy

[mhelin]

Hi, I would like to see an example of SPI and/I2C (SHI) use. I need to communicate parameters to DSP from external MCU.