Mahyuddin Husairi Posted August 5, 2017 Share Posted August 5, 2017 AFAIK, from last year, there are some new driver for AXP209/202 PMU for mainline kernel. One of the main new features that i really like is custom sampling frequency compared to the original driver for linux kernel 3.4 (i just remember the interval are 2 seconds). I want to use AXP209 PMU for power/energy profiling and consumption study of some SBC such as Banana Pi/Pro and some other Allwinner based SBC as comparison. The question is How i want to know current sampling frequency from PMU and how to change the frequency? (25, 50, 100 or 200Hz) What is the reasonable/best practice to write the captured power consumption value (with timestamp) into some logfile or send it through serial communication? if possible without effecting the power consumption itself? I tried AXP209 driver for linux kernel 3.4 and using i2c command to write the captured power consumption value into logfile but it seem the process itself consumed a lot of power. p/s - I don't have professional electric/electronic background. I just learn it from internet. Link to comment Share on other sites More sharing options...
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