> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
Behalf
> Of John Day
> Sent: 18 August 2008 02:12
> To: Microcontroller discussion list - Public.
> Subject: Re: [PIC] PIC-Friendly "serial expansion bus"
> 
> At 07:52 PM 8/17/2008, Forrest W Christian wrote:
> >5) Slaves should be able to be detected by the master, and should not
> >have to have addresses set via dip-switches or other means.
Globally
> >(factory set) unique addresses are ok (aka 1-wire style),
dip-switches
> >are not (aka i2c is not an option).
> 
> Nothing that you have said actually rules out I2C. If you use the
> 'general call' address, you can discover the devices on the bus and
> then dynamically assign an I2C address. In reality it depends almost
> entirely on how dynamic you little network is, if it is highly
> dynamic then this may result in a slow start-up each time.

One thing that would tend to make it undesirable IMO is the complexity
of implementing a slave in software, especially if you want it to work
at reasonable speeds.  If the SSP/MSSP is available on the slave devices
then it's not a problem, but having the heardware available on the
slaves is less likely than on the master IMO.

Regards

Mike

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