Tuning Ultegra Di2

[un0culus]

hi all,

maybe it is manchester coding. on an oscilloscope it looks a bit like phase shifting. it's robust, delivers re-timing and has a small footprint of code in a mcu. it's e.g. used in infrared tv remotes. perhaps worth a try...

cu

[Dr_Mutley]

has there been no progress made on the protocol as yet?

[eddnshoulders]

Hi All

I dunno if anyone is still working on this, but I'm a control engineer with experience in both signal circuit modelling and embedded programming. I've just bought a Di2 group and am keen to extend the functionality. I was bit deflated to discover this post showing that it wasn't simple CANbus (anyone know where the rumour came from that it WAS CANbus?).

Deluz and Jeffr - I was wondering if you would be willing to share with me the traces you've already captured on your DSO(s). I'll have a play in Matlab to demodulate the signal and decode the binary. Once we know what's required we can work out if it's gonna be worth proceeding with hardware. I do signal processing in Matlab and circuit modelling in SPICE day-to-day so this shouldn't take me very long.