Wire (I2C) won't run at 400kHz about arduino_stm32 HOT 4 CLOSED

Just a note that this will be possible when Alexey's digitalWriteFast code is mreged.

I need to remind Alexey (@hiddenpilot) to send me his latest version.

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Note. Implementation of Alexey's code is now unlightly but direct GPIO access should be relatively easy to do using cached data from the master PIN array

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Let me state that for me "functionality" comes before speed. The whole idea of "arduino" is that "it just works" and that the user is bothered as little as possible with the implementation details.

As a test, I tried compiling a simple "I2C" application for the F407 discovery board that I have. No luck!
The "wire" implementation is for "F1", and should be moved to a more general place. As long as it uses the default digitalWrite that should be possible without touching a single line of code! Once that is in place, optimizing for speed may come in useful....

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I'm closing this as irrelevant, since hardware I2C is now the default.

If anyone wants to use software I2C they can but it will be slower than hardware I2C

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