To Someone who want to us I2C

[lovtulip]

There is a very important information but not mentioned in github but in manual.
"Open-drain I2C bus. Needs the pullup resistors to external 3.3V"

So I connected two 10K ohm resistor from 3.3V to SDL and SDA, Then i found my device on I2C_3. Thanks for god.
Here is manual:
https://newdata.aaeon.com.tw/DOWNLOAD/MANUAL/UP%20Xtreme%20(UP-WHL01)%20Manual%206th%20Ed.pdf

By the way, pullup resistors is necessary, but after it, maybe you need try all I2C address, for instance, manual told me that use i2c 5 but actually i found it at 3.

[lovtulip]

It's seems......just don't connect i2c device's power to GPIO 5V. My device support 3.3-5V power so i connected it 5V at GPIO, then I got nothing at i2c bus, but if i connect it to GPIO pin1 which is 3V, even without pull up resistors, i still can find my device