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sentence=General Purpose Input/Output (GPIO) library for Arduino.
paragraph=The GPIO library has been developed to allow high performance digital pin access. Most access functions are compiled to a single instruction and execute in 1-2 clock cycles. The library functions are more than 10 times faster than the Arduino digital pin functions. In some cases as much as 100 times faster. Additional support classes are available for Debounced Digital and Analog Pin, Shift Register Parallel Input/Output and Software Serial. These also demonstrate how the GPIO template class may be used to construct additional libraries.