I2C working, but disabled on Raspbian

mglowinski

Hi,
I've noticed that after installing EVOK, I2C is disabled on Raspbian, but still I can communicate with I2C devices.

I2C disabled in RP4 settings:

I2C devices:

i2cdetect -y 1
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- 18 -- -- -- -- -- -- -- 
20: 20 -- -- 23 -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: 50 -- -- -- -- -- -- 57 -- -- -- -- 5c -- -- -- 
60: -- -- -- -- -- -- -- -- 68 -- -- -- -- -- -- UU 
70: -- -- -- -- -- -- -- --

I wonder how this is possible. Is there some electronic element, which is handing I2C communication on UniPi 1.1? If yes, what is default speed of it?

Martin Kudláček

Hi @mglowinski,
the I2C is enabled in a standard way by device tree overlays. The tool you are using (Raspberry Pi Configuration) probably expects the settings in their own way and don't understand the ours.

mglowinski

@Martin-Kudláček Do you maybe know how i can check current speed of I2C, which is set over device tree overlays?