fix implementation of dtostrf #263
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Description
Implementation of
dtostrf()was based onsprintf(), which is not implemented for floats/doubles in Arduino according to [1].This PR replaces
dtostrf()implementation by one which is not based onsprintf()(reference is stdlib_noniso.h by Ivan Grokhotkov under GNU LGPL).Context
Tested with XMC for Arduino 3.0 and XMC1100 2Go board.
[1] https://forum.arduino.cc/t/sprintf-with-float-values/937562