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I2C Potentiometer AD5245



  • On my board, I made an adjustable power supply for external devices.

    Screenshot from 2022-11-17 23-12-47.png

    It is connected to I2C bus of Omega2S+, and I could see it's present correctly.

    root@OpenWrt:~# i2cdetect -y 0
         0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
    00:                         -- -- -- -- -- -- -- -- 
    10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
    20: -- -- -- -- -- -- -- -- -- -- -- -- 2c -- -- -- 
    30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
    40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
    50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
    60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
    70: -- -- -- -- -- -- -- --                         
    root@OpenWrt:~#
    

    On the Analog Devices Wiki post, there's insturctins how to setup the driver.
    I ran make kernel_menuconfig and customized the kernel for supporting AD's I2C potentiometer devices.

    Device Drivers  --->
      [*] Misc devices  --->
        <*>   Analog Devices Digital Potentiometers
        <*>     support I2C bus connection
        < >     support SPI bus connection
    

    After compiling and flashing I expected that I could see the three EEPROM setting devices as AD's wiki says.

    # ls /sys/bus/i2c/devices/
    0-0022  0-0027  0-002f
    

    But I could only see this.

    root@OpenWrt:~# ls /sys/bus/i2c/devices/
    i2c-0
    root@OpenWrt:~# 
    

    Controlling AD5245 by I2C commands is not that complex, and it won't be much difficult to port some Arduino or MicroPython library into a small Python lib for Omega2.
    But it would be great if I can use the native Linux driver.
    What am I missing in configuration?



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