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I'm trying to follow along with this OS building tutorial.

I'm trying to understand what the LED_ values in rpi-gpio.h mean and how they are all used. Where in the documentation are these values listed? I tried looking at the PDFs but I just don't know where to find them.

What are the values and how are they used? Where are they from?

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    Please don't expect us to search for the question. Add the relevant bit(s) of rpi-gpio.h to your question.
    – joan
    Commented May 27, 2017 at 3:40

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Basically, those #define statements are assigning human-readable names to the GPIO pins, as documented for the Pi.

See the official documentation, scroll to page 90.

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