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Merge pull request #9913 from mikeller/remove_f3_retirement_notice

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Michael Keller 2020-06-16 00:29:20 +12:00 • committed by GitHub
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README.md
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![Important Notice: Support for STM32F3 based flight controllers was dropped in Betaflight 4.1. (This includes all boards with 'F3' in the name.)](docs/assets/images/stm32f3_retirement_notice.svg)
(Please see the [note](#end-of-active-development-for-stm32f3-based-flight-controllers) below.)
![Betaflight](docs/assets/images/bf_logo.png)
[![Build Status](https://travis-ci.com/betaflight/betaflight.svg?branch=master)](https://travis-ci.com/betaflight/betaflight)
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3. For changes to existing targets, the change needs to be applied to the Unified Target config in https://github.com/betaflight/unified-targets/tree/master/configs/default. If no Unified Target configuration for the target exists, a new Unified Target configuration will have to be created and submitted. If there is no Unified Target for the MCU type of the new target (see instructions above), then an update to the 'legacy' format target definition in `src/main/target/` has to be submitted alongside the update to the Unified Target configuration.
### End of active development for STM32F3 based flight controllers
For a while now, development of Betaflight for flight controllers based on the STM32F3 chip has been hampered by a severe limitation that this chip has: Unlike the STM32F4 and STM32F7 models, the STM32F3 versions that are used on flight controllers have only a very limited amount of flash space available to fit the firmware into. This has meant that, starting from around version 3.3, the majority of the new features that were developed for Betaflight could not be added to STM32F3 based boards. Even worse, due to improvement in basic features, other more and more of the less commonly used features had to be removed from these flight controllers, and a number of them are at a point where they only support the bare minimum of functionality required to make them fly.
This means that, even if we kept supporting STM32F3 based boards in future releases, there would only be little advantage in this, as there simply is no space left on STM32F3 to add any of the new features that these releases will contain.
For this reason, and because the effort required to remove features from STM32F3 based flight controllers on a weekly basis is cutting into the time that we have to actually develop new features, we have decided to drop support for STM32F3 based flight controllers after the last release of 4.0.
This does not mean that it won't be possible to use these flight controllers after this point in time - they will still work fine when used with the last release of 4.0, just as there are thousands of users who are still enjoying their STM32F1 based flight controllers with Betaflight 3.2.5. We will also strive to keep these versions supported in new releases of configurator, so that users still using these flight controllers will be able to configure them with the same configurator that they use to configure their STM32F4 and STM32F7 based boards.
## Features
Betaflight has the following features:

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docs/assets/images/stm32f3_retirement_notice.svg
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<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="800px" height="120px" viewBox="0 0 800 120" preserveAspectRatio="xMidYMid meet" ><rect id="svgEditorBackground" x="0" y="0" width="800" height="120" style="fill: none; stroke: none;"/><text style="fill:black;font-family:Arial;font-size:20px;" x="283" y="144" id="e1_texte"></text><rect x="0" y="0" style="fill:#feafa8;stroke:red;stroke-width:5px;" id="e2_rectangle" width="800" height="120"/><text style="fill: black; font-family: Arial; font-size:24px;font-weight:bold;" x="30" y="15" id="e3_texte" dx="0" dy="24"><tspan x="397.8984375" style="text-anchor:middle;">Important Notice: Support for STM32F3 based flight controllers</tspan><tspan style="text-anchor:middle;" x="397.8984375" dy="1.25em">was dropped in Betaflight 4.1.</tspan><tspan style="text-anchor:middle;" x="397.8984375" dy="1.25em">(This includes all boards with 'F3' in the name.)</tspan></text></svg>
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