Re: AW: Sound on an iBook?

No I2C is as old as the hills, I2C is a philips serial
bus standard for talking to upto 256 devices on the
one two wire bus. It is pretty crappy simple & slow &
philips generally used it to talk to digital tuners on
radios.


It is also commonly used in embedded stuff, I wrote a
driver for apples tv tuner card on a performa 630 when
I was working for them.

I didn't talk i2c directly but talked to the cuda
manager on the mac os, however, I made a fake i2c bus
via 2 pins on the paralell port of a pc.

If you want to know more about this look for specs on
the cuda chip if you can find them. However I suspect
a
few things have changed since I did my stuff since
Apple loves moving asics around to keep chip designers
mentally masturbating :-).

--- Christof Petig <christof.petig@wtal.de> wrote:

Iain Sandoe wrote:

quoted

duh! just read the whole thread...

[...]

quoted

Christof could always resort to petitioning

Apple to release the specs, or

quoted

quoted

digging though Darwin source code to discover

the secret.

quoted

the chip specs are freely available:

http://www.micronas.com/documentation/data_sheet/dac3550a_1ds.pdf

quoted

Ben H might know something about driving the iBook

i2c busses - I think that

quoted

they are the new Apple "cereal" style which are

also present on the PCI host

quoted

bridges... but not quite sure.

The link is dead, but

http://www.micronas.com/products/documentation/consumer/dac3550a/index.php

works for me well.

Thank you very much for this information!

Christof

=====
D.J. Barrow Linux for S/390 kernel developer
eMail: djbarrow@de.ibm.com,barrow_dj@yahoo.com
Phone: +49-(0)7031-16-2583
IBM Germany Lab, Sch�naicherstr. 220, 71032 B�blingen


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