Hi All

 

First post here.

Have been using Rpi Zero 2W for a couple of years in various installations and other then speed been happy with it.

 

So got an Orange Pi Zero 2 W in an attempt to use it as a plug in replacement for the Rpi.

Installed Armbian and other than a booting issue, it all works.

 

The first obstacle is the i2c, it is obvious that is nowhere near as easy as a Rpi to set up.

I have read many posts and get more confused as the days go on.

 

So, the question:

Is there a step by step instruction on how to enable I2C.

 

I am connecting 2 x ADS1115 A2D converters, one at &H48 and the 2nd at &H49.

When I use i2cdetect -l 

i2c-0     i2c     DesignWare HDMI

i2c-1     i2c     mv64xxx_i2c   Adapter

i2c-2     i2c              ditto

 

When I use i2cdetect -y 0

&h30 and &h50  show up

 

When I use i2cdetect -y 1

I get UU on &h36

 

In software, I can do a

fd = i2c_open("/dev/i2c-0")    or use i2c-1

rc = i2cselect (fd,&h48,0)

 

BUT, I cannot write or read to the device.(obviously because it does not exist according to i2cdetect )

My  armbianEnv.txt has

overlays=i2c3          changed from i2c0 after reading some posts.

dtparam i2c_arm=on

 

In armbian-config /system/kernel/booto001/ I have ticked i2c0-pi   and for 2 and 3 as well.

 

So after all that I have no idea how to proceed.

 

Regards

 

EDIT: kern.log has repeated entries as follows:

mv64xxx_i2c 5002000 Error applying settings reverse things back

Edited September 17, 20251 yr by J.W van de Poll
Additional Information

zero2w != zero2

moved

Hi All

 

Well I am getting nowhere fast.
When plugging the board into a Rpi Zero 2w ,
i2cdetect -l shows i2c-1 and i2c-2
i2cdetect -y 1 shows 00x48
i2cdetect -y 2 shows oox49 (my second board) and a few others like 3a,50,59

 

Re-wrote the image on the Opi Zero 2w to Debian as I was getting tired of the booting problems with ArmBian.
Followed the manual on ALL the instructions.
i2cdetect -l shows i2c-0 i2c-1 ,i2c-2 and i2c-3
i2cdetect -y 0  does not show any adapters connected
i2cdetect -y 1  shows UU on 36
i2cdetect -y 2 shows 30 and 50
i2cdetect -y 3 does not show any adapters VERY SLOWLY.

 

Orangepi-config /system/Hardware has been tried with just i2c-0 ticked or all three ticked.
Tried ticking phi2c-0 to 3 but that made no difference, still no 00x48 visible anywhere.

I have tried about 6 different OS Images, all to no avail.
Even tried the Rpi image shown on the Opi site.

 

So, I have to conclude (unless someone corrects me) that it is the board that is the problem
or some firmware on the board.

Not sure if I should learn how to upgrade the firmware.

 

Regards