Regarding the issue of ST7539 I2C address

[sstyg]

I have an ST7539 LCD with document addresses of 7C&7E, one is the command address, and the other is the data address. However, my screen addresses are 3E&3F because the driver I wrote myself can display normally. How can I set the data address and command address using U8G2, using "u8g2. setI2CAddress (0x7C)";
//u8g2.setI2CAddress(0x7E);” None of them can be achieved.