In 1996, "CAN" (controller area network) was the
preferred method of connecting multiple
microcontrollers together. It works really well, but
unfortunately PICmicros don't have built in support
for CAN (some 8051 do, as far as I know). Some
>PICmicros have support for I2C, though, and I2C als
>o allows you to connect multiple microcontrollers to
>the same bus. SPI is possible, but unfortunately it
>requires you to increase the number of pins used for
>every device you add, and it isn't really
>peer-to-peer (multi-master). As Vasile said, you
>could also use a 4 or 8-bit parallel bu s with
>addressing lines, but that will really eat away your
>I/O capabilities. Obviously, if you provide more
>information about what you want to do, that would
>help in possible bus selections.
>=20
> Greetings,
> Maarten Hofman.

Thanks for the reply. I have a pic18F4550 as the
"master" mcu. I have 7 16F876 collecting data via
their USARTs. I want to forward their data to the
pic18F4550 and then the last one must forward them via
the USB into a PC (running linux). So far the linux
API is working, the USB interface is working, the
USART of the 16F876 is working well in synchronous
mode. That is my configuration.
A hardware solution using parallel ports would be
gratefull (Vasile Surducan mentioned earlier). Bu,
then, do i have to use some kind of bus arbitrator or
similar?
Thanks in advance...

Manos


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