June 2017
Intermediate to advanced
478 pages
13h 14m
English
Content preview from Mastering Embedded Linux Programming - Second Edition
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Managing Power
For devices operating on battery power, power management is a critical issue: anything we can do to reduce power usage will increase battery life. Even for devices running on mains power, reducing power usage has benefits in reducing the need for cooling and energy costs. In this chapter, I will introduce the four principles of power management:
- Don't rush if you don't have to
- Don't be ashamed of being idle
- Turn off things you are not using
- Sleep when there is nothing else to do
Putting these into more technical terms, the principles mean that the power management system should endeavor to reduce the CPU clock frequency; during idle periods, it should choose the deepest sleep state possible; it should reduce the load by powering ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.