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by el_isma
1889 days ago
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It's even cooler than that: it has collision avoidance.
To start a transfer you drive the clock low. If both masters drive the clock low at the same time. Then they start driving SDA with the address. If at any point in time, the address you are trying to put in the bus is not there, you stop. This could happen if you try to drive a 1 and the other master does a 0 (since it's open collector, the 0 will win), and you know you couldn't put your '1' in the bus, so you shut up and let the other master carry on. |
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