Hi.

I am trying to control an i2c device at the u-boot stage.

i2c 0 bus is activated through /boot/armbianEnv.txt file

 

After settings some i2c commands at /boot/boot.cmd i checked the i2c sdk and sda pins via an oscilloscope. 

But neither output a signal.

i2c dev 0
i2c mw 0x3c 0x00 0xae

I included above commands and tested.

 

Can I know how to activate or use i2c at u-boot level?

 

image: ARMBIAN 5.75 stable Ubuntu 18.04.2 LTS 4.19.38-sunxi

 

29 minutes ago, sunzone said:

Can I know how to activate or use i2c at u-boot level?

I haven't tried I2C in u-boot ... but in any case you need to recompile with enabled support for it. I am not sure if its enabled by default.

Try this way:

./compile.sh CREATE_PATCHES="yes" and when you will be asked for changes go to sources/u-boot/v2019.04/ and run make menuconfig ... enable i2c, go out, save config and return to the build script and proceed.

 

Install u-boot package from output/deb Then run armbian-config -> system -> intstall & update u-boot -> choose update u-boot ... reboot into new u-boot.

 

You can do this also on your board. Cloning sources, applying patches, default config, enabling i2c, flashing bootloader with dd following by reboot.