I2cdetect -y

VIM3 Ubuntu
1

Which system do you use? Android, Ubuntu, OOWOW or others?

Khadas vim3 Ubuntu

Which version of system do you use? Please provide the version of the system here:

20.04

Please describe your issue below:

When reading adc on i2c line, sometimes the device does not respond. When trying to debug by using i2c detect multiple times, the table returned is different sometimes. I have attached the output, if you ctrl f error it shows where the table response is different from expected. I expect there to be 3 devices returned on address 0x20, 0x21 and 0x68. However, as you can see, sometimes 0x68 is missing and sometimes there are devices responding on 0x0e and 0x0f even though I have no devices there.

Thank you.

i2cdetect_output.txt (59.0 KB)

2

Hello @ericz9002

Could you check with latest image? https://dl.khadas.com/products/vim3/firmware/ubuntu/emmc/ubuntu-24.04/vim3-ubuntu-24.04-gnome-linux-5.15-fenix-1.7.5-250925-emmc.img.xz

3

Hi @numbqq

I tried with the latest image but still the adc on 0x68 doesn’t respond sometimes as you can see.

i2c_detect_new_img
i2c_detect_new_img825×904 68.6 KB

It seems the port expanders on 0x20 and 0x21 always respond though.

Thank you.

4

Hello @ericz9002

Could you check on other I2C bus? Or you can try to reduce the I2C frequency.