Aug 182016

The BeagleBone is a inexpensive, credit-card sized computer with many I/O pins. These pins can be easily controlled from software, but it can be very mysterious what is really happening. To control a general purpose input/output (GPIO) pin, you simply write a character to a special file and the pin…
Source: The BeagleBone’s I/O pins: inside the software stack that makes them work

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