Though I wouldn't do such thing (especially with LCD):
12.2.8. Multiple Master Arbitration
The DW_apb_i2c bus protocol allows multiple masters to reside on the same bus. If there are two masters on the same
I2C bus, there is an arbitration procedure if both try to take control of the bus at the same time by generating a START
condition at the same time. Once a master (for example, a microcontroller) has control of the bus, no other master can
take control until the first master sends a STOP condition and places the bus in an idle state.
Arbitration takes place on the SDA line, while the SCL line is set to 1. The master, which transmits a one while the other
master transmits zero, loses arbitration and turns off its data output stage. The master that lost arbitration can continue
to generate clocks until the end of the byte transfer. If both masters address the same slave device, the arbitration
could go into the data phase.
Upon detecting that it has lost arbitration to another master, the DW_apb_i2c stops generating SCL by disabling the output
driver. Figure 84 illustrates the timing of two masters arbitrating on the bus.
Statistics: Posted by gmx — Wed Feb 19, 2025 6:01 pm