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Wire: Let requestFrom return the number of available bytes #165

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Wire: Let requestFrom return the number of available bytes #165

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Commits on Nov 4, 2020

  1. Wire: Let requestFrom return the number of available bytes 

    Previously, it would return the number of requested bytes, even if the
slave returned a NAK on the address byte, preventing libraries to detect
such a NAK. For example, the SparkFun HTU21D library would fail to read
humidity, because the "I'm not ready measuring"-NAK would look like a
successful read, but with dummy data.

This matches the return value with that of the official Arduino versions
and the documentation at
https://www.arduino.cc/en/Reference/WireRequestFrom
    @matthijskooijman
    matthijskooijman committed Nov 4, 2020
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