Re: [avr-chat] USI

[Hugo González Monteverde]

Hi Keith,

Start conditions are TWI, in an UART one would talk about start bit.

Have you seen Atmel's application notes for implementing UART, TWI and 
SPI with the USI? They are the canonical implementations:

http://www.atmel.com/dyn/resources/prod_documents/doc4300.pdf
http://www.atmel.com/dyn/resources/prod_documents/doc2561.pdf
http://www.atmel.com/dyn/resources/prod_documents/doc2565.pdf
http://www.atmel.com/dyn/resources/prod_documents/doc2560.pdf

http://www.atmel.com/dyn/resources/prod_documents/doc2582.pdf

Hugo

Keith Gudger wrote:
> Joerg:
>
> Thanks for your reply.  When you say "generating start conditions" are you
> referring to using it as a UART or SPI/TWI?  Thanks.
>
> Keith
>
> On Wed, 22 Mar 2006, Joerg Wunsch wrote:
>
>
> > Keith Gudger <address@hidden> wrote:
> >
> >
> > > 1) Has anyone used the USI to implement I2C or SPI?  Does it work as
> > > well as the dedicated hardware?  Any known problems?
> >
> > I tried, but was a bit frightened when then studying the appnote for
> > it, and had to see that you've got a lot of ``legwork'' to do there.
> > Things like generating start conditions aren't done by the USI for
> > you, you have to pull the pins appropriately.  The USI then only does
> > the actual bit shifting.
> >
> > However, as the code is there (as usual, needs minor adaptations for
> > GCC), I think you could use it as a starting point.
> >
> > --
> > cheers, J"org               .-.-.   --... ...--   -.. .  DL8DTL
> >
> > http://www.sax.de/~joerg/                        NIC: JW11-RIPE
> > Never trust an operating system you don't have sources for. ;-)
> >
> >
> >
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>
>
>
>
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