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Add LowPower library #2620

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Add LowPower library #2620

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maxgerhardt
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@maxgerhardt maxgerhardt commented Nov 17, 2024 •
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My attempt at making a nice low power library, that works for RP2040 and RP2350. Will close #2528, related to #345.

Adds a modified version of pico_sleep that removes some stuff (like STDIO reinit) that we can't just do in this core.

Currently working on RP2040 with a Pico board, work in progress.

Current state:

  • with all unused GPIOs set to PULLDOWN: 2.08mA
  • disabling input gate (gpio_set_input_enabled(p, false)) : 1.87mA
  • using INPUT mode instead: 1.58mA
  • disabling SWDCLK, SWDIO pins (magic pin number 30 and 3): 1.51mA
  • turning off the brown out detector: 1.48mA
  • changing the regulator for the digital voltage from 1.10V dow to 0.8V: 1.35mA
  • powering down the USB memory: no effect, 1.35mA
  • noticed that I was connected my power meter to VBUS and giving it 3.3V here, so all measurements above were actually at 3.3V
  • changed to supplying 5V to VBUS: 1.22mA
  • change to supplying 5V to VSYS pin (bypasses diode between VBUS and VSYS): 760µA!! (0.76mA at 5V)

grafik

ToDo and notes:

  • make management of GPIO pins before sleep and after wakeup easy, provide good defaults for a e.g. Pico board
  • GPIO pin leakage minimization is important
  • turn off as much digital logic as possible to minimize static power dissipation; in DORMANT mode wiht GPIO wakeup, all clocks are off, so dynamic power dissipation is 0

@maxgerhardt maxgerhardt marked this pull request as draft November 17, 2024 21:39
@maxgerhardt
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Powering it from the actual 3V3 pin with my power meter gets the current to 869µA @ 3.3V, which is less Watt than 750µA @ 5V (3750µW vs 2870µW).. so bypassing the regulator gives good savings, too, if it can be done.

@earlephilhower
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Very neat! Do any clocks or subsystems need to be reinitialized after the sleep modes? I'm thinking of things like USB or UARTs, PWM, DMA, etc.? Or do they just preserve their state and freeze clocks so that they just jump back to life afterwards?

@seamusdemora seamusdemora mentioned this pull request Nov 18, 2024
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So looking forward to seeing this released :)

@ThomasLeister
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ThomasLeister commented Nov 26, 2024 •
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Same here. I have a RAK11300 based project and the OEM's Arduino Framework does not seem to support any power saving measures. Thanks for all your efforts! I'm really excited to see the new features in a new release.

I'm going to set up my arduino-pico environment and try the current version for testing. :-)

@earlephilhower
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@maxgerhardt is this still a draft? I'll be releasing a minor update next week...

@maxgerhardt
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Still a draft, need to test the sleep mode (instead of dormant) plus testing on RP2350. Also fixing the CI (the copy of the board jsons from Arduino-Pico into the platform-raspberrypi folder blocked the pio pkg update to work due to git conflicts). End of next week might be realistic.

@earlephilhower
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No worries, just wanted to double check since I saw you merging master recently. Thx!

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Feature Request: support deep sleep for the RP2350
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@maxgerhardt @earlephilhower @seamusdemora @ThomasLeister