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* A clock phase correction in write_start(void) Some devices require the data wire SDA to be held down at the moment while the clock wire is pulled down too to execute the start condition (e.g. devices using "TinyWires.h" library). This change follows a behaviour of Arduino Wire.h library, where the SCL signal is pulled down in half of period of start condition. * Formatting of modification restyled * Removing mathematical operations from delay * Comments added