David Huisman wrote:
> We cannot have a transmitter sending ANYTHING in idle state.
> The radio network is multipoint and must be free as much of
> the time as possible. An idle condition in my system is no
> transmission at all.

   Don't send ANYTHING in idle state. Trigger data packet
receiving in some other way.

Best Regards,

Mike.


> -----Original Message-----
> From: Mike Singer [mailto:msinger@POLUOSTROV.NET]
> Sent: Friday, 12 September 2003 6:13 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [PIC]:Manchester Lookup table
>
>
> David Huisman wrote:
> > Why Synchronous ?
> >
> > Why not let the UART do the work instead of processing
> > each Bit, you only have to process at byte times ?
> >
> > To answer your question (it seems many of us would make good
> > politicians by answering a question with another question).
>
> I have a question to answer your question too :-)
>
> Who said that in synchronous mode you have to process each Bit?
>
> Let's take "USART Synchronous Master Reception" for 18F PICs.
> Internal synchronization, even double buffered byte reception.
>
> Let remote transmitter work at double frequency in a synchronous
> mode. Line idle state is continues Manchester-2 "0".
>
> Each edge resets some timer on receiver (well, processing each
> Bit, but just a little); Non-resetting the timer triggers
> interrupt to start receiving data packet.( Non-resetting the
> timer is caused by long enough "0"). Perhaps there is a better
> way to start receiving.
>
> Since receiver works at half transmitter frequency, it can see
> only every other (i.e. data) transmitted bit.
>
> Correct me if I'm wrong, please.
>
> Mike.

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