Sleep modes [WIP] - Githubissues

tock / tock-sensortag

Port of Tock for the TI SensorTag (unfortunately no MPU)

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Sleep modes [WIP] #1

Closed cpluss closed 6 years ago

cpluss commented 6 years ago

Overview

This is a WIP branch & PR to add support for different sleep modes in the cc26x0 for the SensorTag. The goal is to be able to reduce the energy consumption when waiting for interrupts (ie. idling).

NOTE: this branch depends on PR https://github.com/helena-project/tock/pull/885

TODO

[x] Manage peripherals to keep track of the lowest sleep mode we can drop into
[x] Enable dynamic power resources (ie. power region dependencies)
[x] Wakeup selectors should be limited to a certain number of interrupts (right now it's catch all)
[x] Power regions should be powered down during deep sleep
[x] Successfully enter deep sleep
[x] Switch to RCOSC HF before entering deep sleep

Future work

[ ] Do not force disable for DMA & Crypto clocks during mcu power down
[ ] Most clocks should be halted during sleep & deep sleep
[ ] Timing constraints when sleeping
[ ] Sync clocks and set a max sleep time for deep sleep (9 hours) to prevent clocks from drifting

cpluss commented 6 years ago

@alevy , Filip (@filipni) managed to disable the temperature sensor, and configure the gpio pins correctly for each of the external sensors (pull up, pull down, etc); we're now at ~18uA in deep sleep with AUX disabled, and ~95uA with AUX enabled :)