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before seeing these discussions I was moving to controller/device. I'm not sure if initiator really describes the master task. target is very good, though
Keep in mind that although a priori it might feel like the initiator controls the bus, it doesn't. The target can use clock stretching to change the clock rate too, or refuse to ACK anything. And data transfers are symmetric after the initial address cycle.
So the initiator's job is really just to start and end transactions, and *suggest* a clock rate. That's why it's a fitting term, because it really just starts the conversation but doesn't have that much control.
And of course with multi-master devices can switch roles. I've even seen a device use an I²C bus as a broadcast packet network.
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