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This is to keep the top-level directory clean, to make it clear what is
core and what is a port, and to allow the repository to grow with new ports
in a sustainable way.
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With this patch machine.I2C() uses HW I2C peripheral blocks on F4 MCUs.
Software I2C is used for other MCUs.
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This allows one to construct an I2C object using ids that are specific
to the stmhal port, eg machine.I2C('X'). Right now the implementation
of I2C uses software I2C but the idea is to just change the C-level I2C
protocol functions to hardware implementations later on.
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