Lpc2000

** oops **  Misread the docs on /WS (word select).  But the concept 
is still the same with two slaves and externally generated /ws and 
clock.  Very simple if you can use both SPI ports.


--- In lpc2000@yahoogroups.com, "ian.scanlon" <scanlon.design@...> 
wrote:
>
> I have done something similar.  I2S from uC to DAC looks like 
(quick 
> review) simple SPI interface.
> 
> You need to create a system with two slave devices and an external 
> source for clock and /select. Set SPI port slave, DAC already slave.
> 
> Data:  Connect directly- uC slave out to DAC in
> Clock: External clock source (timer output ?) connects to both uC 
and 
> DAC. Used to clock the data from the SPI port to the DAC.
> /select: Use timer fed by clock(above) with period set to sample 
> output rate and pulse width-low to count the number of bits in each 
> sample.  
> 
> Now you just need to keep the SPI buffer full - either interrupt or 
> polled.  The data is transfer from the SPI port (as slave) to the 
DAC 
> clocked by the clock and /select you have supplied.
> 
> Philips has a document "I2S Bus Specification" that may be 
helpful,  
> don't know the real .pdf filename.
> 
> 
> Ian
> 
> --- In lpc2000@yahoogroups.com, "ee_gary" <ee_gary@> wrote:
> >
> > I'm interested in this as well.  Has anyone successfully 
> communicated
> > with an I2S DAC using SPI?
> > 
> > Gary
> > 
> > --- In lpc2000@yahoogroups.com, "croquettegnu" <croquettegnu@> 
> wrote:
> > >
> > > Thanks but this link concerns at91 product !
> > > you mean there are no peripherals dedicated to I2S or AC97 in 
the
> > LPC ???
> > > 
> > > Thanks
> > > --- In lpc2000@yahoogroups.com, "ian.scanlon" <scanlon.design@> 
> wrote:
> > > >
> > > > See:
> > > > http://www.atmel.com/dyn/resources/prod_documents/doc2646.pdf
> > > > 
> > > > to implement in CPLD.
> > > > 
> > > > You can also set the SSP as slave and use internal timers and 
> some 
> > > > external logic to generate required signals and timing.
> > > > 
> > > > Ian
> > > > 
> > > > 
> > > > --- In lpc2000@yahoogroups.com, "croquettegnu" 
<croquettegnu@> 
> wrote:
> > > > >
> > > > > I need to use the I2S protocol and I am looking for what 
would
> > be the
> > > > > most appropriate peripheral to deal with ???
> > > > > 
> > > > > Is AC97 possible too ?
> > > > > 
> > > > > Thanks a lot !
> > > > >
> > > >
> > >
> >
>