58d71d4efb
Sample implementation of a power manager app that uses the zephyr power management infrastructure. This app demonstrates use of the hooks to implement Low Power State and Tickless idle power saving policies. Tested on quark_se. Origin: Original Change-Id: I10207014f2a844374b4c7a1c0ed50f2fb5c3c440 Signed-off-by: Ramesh Thomas <ramesh.thomas@intel.com> Signed-off-by: Sergio Rodriguez <sergio.sf.rodriguez@intel.com>
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1.8 KiB
Text
56 lines
No EOL
1.8 KiB
Text
Title: Power management demo
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Description:
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A sample implementation of a power manager app that uses the zephyr
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power management infrastructure.
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This app will cycle through the various power schemes at every call
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to _sys_soc_suspend() hook function.
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It will cycle through following states
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1. Low Power State (LPS) - puts the CPU in C2 state
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2. Tickless Idle - demonstrates hooks into tickless idle entry and exit
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3. No-op - no operation and letting kernel do its idle
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Building and Running Project:
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This application is architecture and SoC specific. It is written for x86
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architecture and uses features specific to quark_se platforms.
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This is a microkernel only project since the zephyr power management
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infrastructure currently is only microkernel idle based. In future, when
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nanokernel idle is supported, a separate nanokernel app would be created.
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make BOARD=<quark_se board>
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Troubleshooting:
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Problems caused by out-dated project information can be addressed by
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issuing one of the following commands then rebuilding the project:
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make clean # discard results of previous builds
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# but keep existing configuration info
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or
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make pristine # discard results of previous builds
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# and restore pre-defined configuration info
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Sample Output:
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Power Management Demo
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Going to low power state!
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Resume from low power state
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Total Elapsed From Suspend To Resume = 163838 RTC Cycles
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Tickless idle power saving!
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Exit from tickless idle
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Total Elapsed From Suspend To Tickless Resume = 163838 RTC Cycles
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... |