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Edgar Bonet 939534d580 Correct handling of millis() rollover

millis() returns an unsigned long integer, and C++ guarantees that
arithmetics on this type work modulo (ULONG_MAX+1). This behavior
ensures that computing a delay as

    millis() - previousMillis

yields the correct result across millis() rollover events, as long as
the time actually elapsed is less than about 49.7 days.

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Correct handling of millis() rollover

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Correct handling of millis() rollover

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README.md

Adafruit_GPS

This is the Adafruit GPS library - the ultimate GPS library for the ultimate GPS module!

Tested and works great with the Adafruit Ultimate GPS module using MTK33x9 chipset ------> http://www.adafruit.com/products/746

These modules use TTL serial to communicate, 2 pins are required to
interface.

Adafruit invests time and resources providing this open source code, please support Adafruit and open-source hardware by purchasing products from Adafruit!

Written by Limor Fried/Ladyada for Adafruit Industries.
BSD license, check license.txt for more information All text above must be included in any redistribution

To install, use the Arduino Library Manager to search for 'Adafruit GPS' and install the library.