GPIO usage

转载至:http://en.wikipedia.org/wiki/General-purpose_input

GPIOs are used in:

  • Devices with pin scarcity: integrated circuits such as system-on-a-chip, embedded and custom hardware, and programmable logic devices (for example, FPGAs)
  • Multifunction chips: power managers, audio codecs, and video cards
  • Embedded applications (for example, Arduino, BeagleBone, PSoC kits and Raspberry Pi) make heavy use of GPIO for reading from various environmental sensors (IR, video, temperature, 3-axis orientation, and acceleration), and for writing output to DC motors (via PWM), audio, LCD displays, or LEDs for status.

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