I2C/TWI/Wire Multi-master Arbitration Fix

[frazras]

There is a "bug" in AVR's implementation of I2C multi-master arbitration. There is a fix proposed in the blog below, could this be implemented in the Wire Library?

http://www.robotroom.com/Atmel-AVR-TWI-I2C-Multi-Master-Problem.html

[pat1]

Any news about this?

[sid1202]

@cmaglie IS this something that will be looked at soon ? I know you guys are busy, just wondering.

Thanks,
Sid

[kb-]

We need this! Multi-master is unusable :(

[iBeta666]

We need this! Multi-master is unusable :(

Do you mean it is unusable after the fix from robotroom?
If not, while it might be nice to have in the library, it is easily possible to add the necessary lines of code - there are not many.

[kb-]

I meant before the fix. I didn't really get where to add the lines. But anyway, I've finally been able to get my multi-master code to work without having to change anything in the Wire library.

[pat1]

To have the library working on my project on multi-master configuration I have done this patch
r-map/rmap@63a118d
I think the robotroom patch will add a better work for Arbitration in addition to my patch.
Paolo