Maybe you are writing without checking whether previous data has been sent.. 
thats maybe why your getting write collisions..

"alan smith" <micro_eng2@yahoo.com> wrote in message 
news:20061125173425.41324.qmail@web51905.mail.yahoo.com...
> I'm trying to get master PIC18F4525 to talk to a slave PIC18F8310;  The 
> board with the 4525 has I2C working on it...its already talking to some 
> other I2C devices, and it works fine.  On the board with the 8310, I've 
> configured the device as a slave, 7 bit addressing to match whats on the 
> other board,  I've pared down the firmware to just write out an address 
> and data word to the slave board (removed everything else from both 
> sides....master configures to send, slave just turns on an LED when it 
> gets the interupt).  I've also removed the other I2C devices from the 
> board just to make sure they are not causing a problem.
>
>  But I am getting a WCOL bit set whenever I try to write to the SSBUF 
> register, I set the start bit in the CON1 register, it acks that the start 
> bit was last set, and then try to move the address data into SSBUF and the 
> collision bit sets..  Curious why that is occuring.
>
>
>
>
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