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OneWire library

A modification of the Arduino OneWire library maintained by @PaulStoffregen. This modifications supports the ESP32 under the Arduino-esp32 Environment.

No changes are required for compatibility with Arduino coding.

Original Source is Paul's 2.3 version. Forked 28DEC2017

@stickbreaker V2.3.1 30APR2018 add IRAM_ATTR to read_bit() write_bit() to solve ICache miss timing failure. thanks @everslick re: espressif/arduino-esp32#1335 V2.3 28DEC2017 original mods to support ESP32