[En-Nut-Discussion] STM32 share EXTI can not work properly, need some fix below

[Nathan Moore]

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> Follows the Nut/OS coding rules (we never use '1 == x', always 'x == 1')
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Why is that?  While (x == 1) seems more natural (1 == x) is safer since the
accidental (1 = x) will generate a compiler error.