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    can you give a function that shows what isn't working in code? something you would expect to do one thing, but isn't working out that way? I'm not certain I know what you mean by "the variables return zero". Also some more information about the members of an MB_GFX_SPI, and where mbR comes from. Commented Mar 9, 2015 at 2:49
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    Try initializing mbGFX with its regular constructor (GFX_SPI mbGFX(...);) instead of using copy-initialization (GFX_SPI mbGFX = MB_GFX_SPI(...);). Commented Mar 9, 2015 at 8:52