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[FAQ] TDA4AEN-Q1: How to measure power consumption on Linux using the on board INA226

Keerthy J
Guru**** 154900 points
Part Number: TDA4AEN-Q1
Other Parts Discussed in Thread: INA226

Tool/software:

Can we use Linux to enable the on-board INA226 instances to measure power?

  • 0
    TI__Guru**** 154900 points

    Hello,

    Using the below patch we can enable the INA226 to measure power on TDA4AEN/AM67-EVM.

    0001-arm64-dts-ti-k3-j722s-evm-Add-INA226-nodes-for-power.patch

    Download the above patch to:

    $SDK_Path/board-support/ti-linux-kernel-6.6.44+git-ti
cd $SDK_Path/board-support/ti-linux-kernel-6.6.44+git-ti
git am 0001-arm64-dts-ti-k3-j722s-evm-Add-INA226-nodes-for-power.patch
cd ../..
make linux


    Steps to install the new dtb to SD card:

    Edit $SDK_Path/Rules.make file sudh that ROOTFS_PART=/media/$USER/root
    Insert the SD card of 10.1 SDK.

    sudo make linux-install

    Once you boot with SD after the above steps you can see the hwmon interfaces in Linux giving Live power numbers:

    root@j722s-evm:~# cat /sys/class/hwmon/hwmon*/power1_input
1962500
81250
12500
81250
0
18750
18750
5281250
181250
68750
81250

Above are the power numbers in micro Watts

root@j722s-evm:~# cat /sys/class/hwmon/hwmon*/in1_input                                                                                                          
863
850
3300
1798
749
1800
1798
3300
1099
3295
1801

Above are the voltage rails in milli Volts

    Note: I have used the latest 10.1 Linux SDK to enable the feature.

    Best Regards,
    Keerthy