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use AND operator to perform mod #16

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StefanoBelloni
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Hallo,
first of all thanks for this library.

Since the max size of the RX buffer is a power of two, it might be convinient to use the &-operator:
I found that, for example, avr-gcc (GCC) 7.3.0 does not optimize it, but use the expensive _divmodhi to perform n % 64.

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