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GPIO, I2C, SPI on Orange Pi 3 in C, how to start?

Berger
in Beginners

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I'm familiar with ARMbian on Orange PI 3, more specifically I'm trying to master programming in C on this system and hw.

Since yesterday I've been searching in vain for some description, ideally with examples of how to control GPIO, I2C and SPI in C.

Can you advise?

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