Sorry for the repost forgot the Tag :)



Hi all,

        I want to be able to control six F84's from a master
        F84. I think my options are I2C, SPI or some serial link.

        It would also be nice if the slaves could send data back
        to the master as well.

        Looking on the net I find lots of I2C routines, but they
        all seem to be for the master and not for the slave.

        Does anyone know where I could get a simple set or routines
        in 'C' for slave and master to get me going.

        SPI... Don't really know anything about this so I'll look
        at this if I can't get anywhere with I2C or Serial.

        lastly Serial...

        I think this is my best chance of success because I've already
        got one pic talking to another and probably just need to expand it.

        Would this serial set-up work ?

        Master pic Tx pin wired to all six slave Rx pins
        Master Pic Rx pin wired to all six slave Tx pins

        So now master should be able to send cmd's to any slave and
        any slave back to master. Also I thought of using six more pins
        on the master as Select lines going to each slave. So slave can
        grab attention of master and help on bus collisions.

        I'am a little unsure about all the slave Tx pins connected together
        on the master Rx pin, if all Tx's are low and one goes high to send
        data, will this cause a short and blow the pin ??, if so could I use
        some series resistor or something ?


        Any suggestions, help appreciated.

Thanks,

Russ.


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