[Question] How do I set a pin to alt0? about periph HOT 6 CLOSED

Doing the pin setup manually won't load the kernel driver, which is the key point of raspi-config. Anyhow here's the documentation to do what you asked for.

The function you want is https://godoc.org/periph.io/x/periph/host/bcm283x#Pin.SetFunc

Documentation is at https://godoc.org/periph.io/x/periph/conn/pin#PinFunc

Constants are at https://godoc.org/periph.io/x/periph/conn/i2c#pkg-constants

from periph.

Can you explain what you are trying to achieve? We never used wiringpi.

from periph.

Ok, I'll try my best.

The whole setup is for the I2C. Basically, the first 4 lines of wiringPi code are setting the GPIO0 and GPIO1 to input mode and then sets the pin functionality to operational mode 4 (use as I2C).

You can check the datasheet (page 102) for the operational modes and see this post explaining what this mode 0b100 means (translates ALT0 or operational mode 4).

The last 4 lines, sets the GPIO2 and GPIO3 to output and sets to HIGH.

from periph.

Then what about enabling i2c1 in raspi-config then use i2creg?

from periph.

References:

• https://godoc.org/periph.io/x/periph/conn/i2c/i2creg
• https://godoc.org/periph.io/x/periph/host/rpi
• https://www.raspberrypi.org/documentation/configuration/raspi-config.md

from periph.

Then what about enabling i2c1 in raspi-config then use i2creg?

Because I'm having a REST server that's written in Go which is supposed to have an endpoint that does the pin setup. So I wanted to use this lib to achieve that instead of calling exec.

Thanks for the references, but do you have some example illustrating how to setup some pins as I2C using i2creg?

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