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36 lines
2.3 KiB
Markdown
36 lines
2.3 KiB
Markdown
---
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id: device-power
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title: Power Management State Machine
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sidebar_label: Power Management
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---
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Long battery life is one of the main goals of this project. Based on intial measurements, the current code should run for about three days between charging (assuming using a t-beam with a 3500mAh 18650 battery). This will hopefully be increased to around eight days in the future.
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## States
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From lower to higher power consumption.
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- Super-deep-sleep (SDS) - everything is off, CPU, radio, bluetooth, GPS. Only wakes due to timer or button press. We enter this mode only after no radio comms for a few hours, used to put the device into what is effectively "off" mode.
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* onEntry: setBluetoothOn(false), call doDeepSleep
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* onExit: (standard bootup code, starts in DARK)
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- deep-sleep (DS) - CPU is off, radio is on, bluetooth and GPS is off. Note: This mode is never used currently, because it only saves 1.5mA vs light-sleep - (Not currently used).
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- light-sleep (LS) - CPU is suspended (RAM stays alive), radio is on, bluetooth is off, GPS is off. Note: currently GPS is not turned off during light sleep, but there is a TODO item to fix this.
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* NOTE: On NRF52 platforms (because CPU current draw is so low), light-sleep state is never used.
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* onEntry: setBluetoothOn(false), setGPSPower(false), doLightSleep()
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* onIdle: (if we wake because our led blink timer has expired) blink the led then go back to sleep until we sleep for ls_secs
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* onExit: setGPSPower(true), start trying to get gps lock: gps.startLock(), once lock arrives service.sendPosition(BROADCAST)
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- No bluetooth (NB) - CPU is running, radio is on, GPS is on but bluetooth is off, screen is off.
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* onEntry: setBluetoothOn(false)
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* onExit:
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- running dark (DARK) - Everything is on except screen.
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* onEntry: setBluetoothOn(true)
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* onExit:
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- serial API usage (SERIAL) - Screen is on, device doesn't sleep, bluetooth off.
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* onEntry: setBluetooth off, screen on
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* onExit:
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- full on (ON) - Everything is on, can eventually timeout and lower to a lower power state.
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* onEntry: setBluetoothOn(true), screen.setOn(true)
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* onExit: screen->setOn(false)
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- has power (POWER) - Screen is on, device doesn't sleep, bluetooth on, will stay in this state as long as we have power.
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* onEntry: setBluetooth off, screen on
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* onExit: |