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'[PIC] Re: ISA-based mp3 player'
2005\10\31@180330 by CSB

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I did consider getting a standalone mp3 player, but this wouldn't be
much of a project.

As for a special sound card, I wouldn't refuse one, but again, where's
the fun?

I perhaps should have specified that I am looking for a hobby project.
I searched some more today, and still, it seems nobody has had a need
(or an interest) for this kind of thing!

Thanks for the replies,
Christian

2005\10\31@183135 by marcel

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How about a CPLD-based custom MMU that interfaces between the ISA bus, your
memory and a VS1001/VS1011? you could memory-map all the configuration
registers of the MP3 chip and convert the incoming data in that region to SPI
on the fly. The VS1001 asserts a pin when it needs data so you can just listen
to that and bit-bang serial data to it when necessary. That chip also has a
built-in op-amp, so your circuit could be fairly simple.
- Marcel

CSB <spam_OUTcsb_cbwTakeThisOuTspamfastmail.fm> wrote:

{Quote hidden}

2005\10\31@183135 by marcel

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face
How about a CPLD-based custom MMU that interfaces between the ISA bus, your
memory and a VS1001/VS1011? you could memory-map all the configuration
registers of the MP3 chip and convert the incoming data in that region to SPI
on the fly. The VS1001 asserts a pin when it needs data so you can just listen
to that and bit-bang serial data to it when necessary. That chip also has a
built-in op-amp, so your circuit could be fairly simple.
- Marcel

CSB <.....csb_cbwKILLspamspam@spam@fastmail.fm> wrote:

{Quote hidden}

2005\10\31@184744 by CSB

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On Mon, 31 Oct 2005, marcelspamKILLspamcarrietech.com wrote:

> How about a CPLD-based custom MMU that interfaces between the ISA bus, your
> memory and a VS1001/VS1011? you could memory-map all the configuration
> registers of the MP3 chip and convert the incoming data in that region to SPI
> on the fly. The VS1001 asserts a pin when it needs data so you can just listen
> to that and bit-bang serial data to it when necessary. That chip also has a
> built-in op-amp, so your circuit could be fairly simple.
> - Marcel
>

That's precisely what I have in mind. The audio output would be connected
to the soundcard, the same way as CD-drives.
To further minimise the workload of the CPU, I would add some RAM on the
card, and I could even have a IR remote control with a keypad, LCD, etc...

It seems like  very do-able project, but I was hoping someone had already
done something along these lines, on which I could inspire myself.

I'll probably do it eventually, it's just a matter of time... but for
now I'm pretty busy with other stuff. Perhaps I could eventually submit
it to the board-making contest!

Hmm.. it looks like my electronics tinkering time is now 100% booked for
the next year at least...


Christian

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