[epic] Low Power State Story

[kammce]

libhal does not have a low power story which means that libhal cannot provide a consistent pattern for putting devices into low power. This should be investigated to determine the categories of low power states and how those could be applied to libhal libraries. I could imagine that there are the following low power categories:

• low_power(): Put the device into an idle mode that requires very little work to reactivate
• deep_sleep(): Like low power but a bit deeper and may require some startup time before the APIs resolve themselves.
• shutdown(): Completely turn off the device. The assumption is that the device loses all state in this mode and would need to be reinitialized to allow APIs to work.

Note

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