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Fix some compiler warnings when building StdDriver with the latest ARM toolchain #30

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@MacDue MacDue commented Jun 22, 2022

  • The first fix is using NULL rather than 0ul to check a pointer.
  • The second is using PRIx32 rather than %x to print a uint32_t in hexadecimal.

Using 0ul generates more compiler warnings.
This standard macro always returns the corect (hex) print code for a
uint32_t, without this the compiler rasies a bunch of warnings here.
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