Hello, I'm trying to communicate a device with I2C port.(Not arduino i2c port.Udoo's native i2c port) I'm using a level shifter between device and i'm %100 sure level shifter is working because i already tried on Aduino Mega and it's works fine.But i think problem is about udoo's i2c port. My Problems : 1)I'm listing i2c devices via Code: sudo i2cdetect -r -y 0 and result is not stable.I mean my device sometimes shows on result and some times not.Here is the example picture. I actually tried to connect 4.7k pull-up resistor but nothing changed.What can i do about this ? By the way i can successfully send commands and get result from device so i know cabling is correct. 2)sometimes i2cdetect takes longer the refresh list its taking one second for per adress and sometimes it's refreshing list instantly.What could be reason for this issue ? Thanks.