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1 Month Battery Life with Firmware Replace

1 Month Battery Life with Firmware Replace

2023-04-27 17:40:04

We’re proud to announce that beginning the firmware model 0.82, your Flipper Zero’s battery life will last as long as 1 month! It took us 2 years to resolve all firmware points that prevented Flipper Zero from switching to power-saving mode, leading to the identical energy consumption baseline in each idle and lively states. In consequence, Flipper Zero’s battery life was roughly 1 week as a substitute of the supposed 1 month.

On this put up, we’ll inform you concerning the new energy saving mode and the challenges with the STM32 microcontroller we needed to overcome to make the brand new mode a actuality. We may even share updates about worldwide gross sales.

The firmware model 0.82 is obtainable — Update now! This model brings a brand new deep sleep characteristic that extends your machine’s battery life as much as 1 month by dramatically lowering energy consumption when there are not any operating functions or connections in your Flipper Zero.

When Flipper Zero will not be operating any consumer functions, the machine enters an idle state (sleep mode). As soon as an software begins, the machine switches to an lively state: the backlight prompts, information alternate with the microSD card begins, and so forth. Within the lively state, energy consumption can attain as much as 30 mA with a backlight, as much as 400 mA with an lively transceiver, and even as much as 2 A with an lively transceiver and linked exterior module.

The microcontroller utilized in Flipper Zero helps completely different sleep modes which have completely different ranges of power effectivity:

  • Earlier than, we used a mode that wasn’t a real sleep mode. This mode was simpler to implement however much less power environment friendly. On this Legacy sleep mode, Flipper Zero consumed 9 mA of energy within the idle state.
  • After resolving firmware points, we enabled a brand new energy-efficient sleep mode, by which numerous microcontroller blocks are turned off, and the core clock is switched to a extra energy-efficient clock generator. On this deep sleep mode, the ability consumption baseline within the idle state is just one.5 mA!
The brand new firmware leads to energy consumption of roughly 1.5 mA within the new deep sleep mode, in comparison with about 9 mA within the outdated sleep mode

Find out how to verify new deep sleep mode

The implementation of the deep sleep characteristic was advanced. There are a number of eventualities the place this mode is probably not activated, corresponding to when a background software is operating, second processing core duties are lively, or a Distant Process Name (RPC) session is ongoing over Bluetooth LE.

To confirm in case your Flipper Zero is correctly getting into deep sleep mode, go to Settings →  Energy → Battery Data and look forward to the LCD backlight to show off. A Napping... message ought to seem within the battery standing.

Battery data widget exhibits if deep sleep mode is on

Find out how to flip off deep sleep mode

This deep sleep mode is enabled by default. You needn’t disable it except you’ve got issues together with your Flipper Zero. Thoughts that this deep sleep mode remains to be in its experimental part. It could result in unpredictable bugs and unwanted effects. Our testing crew has found and resolved a lot of the bugs, however there should still be some that we nonetheless must establish. If you happen to suppose the mode causes the bug, you possibly can disable the mode for testing functions and share the difficulty on the forum.

To disable the deep sleep mode in your machine, go to Settings → System and set Sleep Methodology to Legacy.

Disable the brand new deep sleep mode in Settings

We tried to implement deep sleep mode for a very long time, however we couldn’t perceive why the system crashed after exiting deep sleep mode.

Flipper Zero is predicated on an STM32WB collection microcontroller. Firmware improvement with this microcontroller is extremely difficult as a result of its dual-core structure, shared peripherals, and closed-source firmware for the Core 2 with out the flexibility to debug it????

The second core runs proprietary binary blob firmware with no approach to debug it

One other drawback was poor documentation and incomplete Actual-Time Working System (RTOS) assist within the Software program Growth Package (SDK). We had so as to add assist for deep sleep contained in the working system ourselves. The furi_hal_os_sleep() operate performs tick suppression contained in the OS area.

Though the ARM structure was initially designed for cell utilization and low energy consumption in thoughts, the implementation of power-saving capabilities is definitely carried out by chip distributors. Distributors use numerous approaches to implement power-saving capabilities and supply examples and SDKs to simplify builders’ lives. However that doesn’t assure success, particularly on multicore, shared periphery chips.

Challenges with Core 2

A set of {hardware} semaphores and Inter-processor communication controller are used to regulate subsystem possession and signaling between Core 1 and Core 2. Core 1 firmware should explicitly take a few of them to regulate the clock, flash, and different vital phases. Combining work with a flash controller and lively BLE connection is an exceptionally advanced job: utilizing a flash controller stalls instruction/information fetch from reminiscence, which causes Core 2 to overlook transmission deadlines. The entire system is sort of subtle and we’ll cowl it in a separate put up.

Virtually each digital machine has oscillators inside. Flipper Zero MCU has 7 oscillators. An oscillator is a circuit consisting of a small crystal of quartz and an amplifier that generates even pulses, which offer exact timing for the MCU core and subsystems! These pulses are essential for the microcontroller’s inner operations.

Oscillators play a vital function within the performance of Flipper Zero firmware

Three of those oscillators are particularly vital:

  • Excessive-Velocity Exterior (HSE) and Low-Velocity Exterior (LSE) oscillators present reference clocks, that are exact, however not power environment friendly.
  • Excessive-Velocity Inside (HSI) oscillator gives an inner clock, which is power environment friendly, however not exact.

The LSE oscillator is constantly lively, the HSE oscillator is activated when an software is operating, and the HSI oscillator is activated when the machine enters deep sleep mode. Nonetheless, utilizing the HSE oscillator throughout deep sleep is unattainable, requiring all clock domains to be switched to HSI earlier than getting into deep sleep mode. Overcoming this problem, we have now developed the furi_hal_clock_switch_to_hsi() operate that facilitates a clean and environment friendly transition to the energy-efficient HSI oscillator, enabling deep sleep performance.

See Also

Since going into sleep mode bodily turns off peripheral subsystems, they have to be in a disabled state. That brings API design to a brand new stage of complexity, particularly in multitask OS. It took us a while to design APIs to be appropriate with deep sleep mode. The furi_hal_power_deep_sleep() operate is chargeable for the transition into deep sleep mode on the energy area stage.

One other drawback is debugging Core 1 firmware when in deep sleep mode: MCU Debug subsystem have to be specifically configured to wake the system up from sleep. Debugging can be unattainable if the system is misconfigured, exiting, or getting into deep sleep mode and one thing goes improper. Additionally, halting MCU whereas in sleep will wake it up on the HSI clock, which is far slower than HSE and requires a particular debug adapter configuration.

As you possibly can see, growing and debugging with the STM32WB collection microcontroller is a difficult job. That’s the reason it took us so lengthy to establish and resolve all the problems associated to our firmware. However because of our crew of builders, the battery lifetime of your Flipper Zero will last as long as 1 month, beginning the firmware model 0.82.

Gross sales of Flipper Zero are gaining momentum around the globe. Greater than 200 thousand gadgets have already reached their homeowners! On the identical time, worldwide supply is a giant problem for us. We have interaction reseller companions to promote Flipper Zero worldwide.

To your comfort, we have now created a How To Buy web page the place you possibly can choose your nation and consider dwell details about all official companions. The web page is presently in beta mode however will quickly replace information about companions in actual time.

As a result of unbelievable recognition of Flipper Zero, many fraudulent accounts have appeared on the Web. Solely the web sites listed below are trusted. We don’t promote our merchandise on social networks like Instagram, Telegram, or TikTok.

⚠️ In case you are supplied to purchase Flipper Zero anyplace else, it’s almost certainly a fraudulent vendor. Do not ship them cash, you’ll most likely be scammed. Please report all scammers to us by way of the Abuse Report Form.

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