CMSIS violates the following MISRA-C:2004 rules:

• Required Rule 8.5, object/function definition in header file.
  Function definitions in header files are used to allow 'inlining'.

• Required Rule 18.4, declaration of union type or object of union type: '{...}'.
  Unions are used for effective representation of core registers.

• Advisory Rule 19.7, Function-like macro defined.
  Function-like macros are used to allow more efficient code.