Returns the next byte (character) of incoming serial data without removing it from the internal serial buffer. That is, successive calls to peek() will return the same character, as will the next call to read(). peek() inherits from the Stream utility class.
Serial.peek()
None
the first byte of incoming serial data available (or -1 if no data is available) - int
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The text of the Energia getting started guide is licensed under a Creative Commons Attribution-ShareAlike 3.0 License. Energia reference is based on Arduino reference. Code samples in the guide are released into the public domain.