RTEMS | stm32f4/i2c: Implement fast mode up to 400kHz in set_bitrate (!1203)

[Mohamed Ayman (@mohamedayman23)]

Mohamed Ayman commented on a discussion: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1203#note_148598


Hi Dr. @gedare 👋,

The fix was tested using two plain-C unit test files compiled and run on a Linux, as all registers were stubbed in software. The first file (after adding my changes) covers 30 cases across standard mode, fast mode, boundary/error conditions, and mode transitions: **all passing**. 

The second file has both the original logic code and the modified one, the original fails 11 of 13 tests, while the fixed version passes all 13, confirming the fix works without breaking anything.

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1203#note_148598
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