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--- bmw-motorrad-can-bus:start [2023/01/20 21:28] – created vdesmedt
+++ bmw-motorrad-can-bus:start [2023/01/21 07:39] (current) – vdesmedt
@@ Line 1: / Line 1: @@
 ====== Playing with BMW Motorrad CAN Bus system ======
+=== Introduction ===
+There is initially two goals to this starting investigation : one is to extract data from the system just because I can, and the other, much more concrete is that, after my bike fall the very first day I had it, the button to turn the 4 blink light stop working. It’s not a button that you need a lot but when you need it, you really do, and so I thought if I could reproduce what this button do programmatically, I would not have to replace a 300€ commodo and rely on my phone instead….  Let’s see if that is even possible.
+So far, my understanding is that ODB2 is a standard way (a protocole) to establish dialog with various MCU’s and devices within a vehicule. It defines how to « talk » with the different MCU in the vehicule and define standard way to report problems depending on it source, nature and criticality. It also include the definition of a connector, defining its shape and to what are all its pin connected
+CAN is a low level communication protocol that defines low level details as how many wires do you need, what are the different voltages used on those wires, how is a bit transported on this wires, how those bits finally make a byte or more, how are collision detected and resolved (when two devices want to talk at the same time), …
+ODB2 protocole can be « transported » in different ways, CAN Bus being one of them.
+Let’s dig a little…
+=== Starting point ===
+  - Learn about CAN-BUS, ODB2
+  - See how I can connect to the CAN Bus of my motorbike (BMW R 1250 GS/A)
+  - Figure out how to signal a press on the button so that the central unit respond by turning the lights on.
+  - Defien what’s next :)