i2c not showing up

[J.W van de Poll]

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

[Werner]

zero2w != zero2

moved