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It's not documented, although there is the option to sniff and log all traffic and reverse engineer the protocol.
Your suggestion about going direct to the display driver would probably be less painful an exercise.
One question I have about this is how would the slave knows when when...
I have a commercial circuit which uses a mask ROM mcu which receives and transmits data via the I2C bus. It receives data to display via a slave MCU and the master then transmits to the LCD driver controller to display dot matrix graphics.
The master MCU needs to be viewed as a "black box"...
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