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History

Drew Bednar afcbbd4469 Fixed chapter two code to allow for multi-turn conversations.		4 days ago
..
AHT20	Agents and gpio	1 month ago
GC9A01	Fixed chapter two code to allow for multi-turn conversations.	4 days ago
LED	Working LED example	1 month ago
udev	Working LED example	1 month ago
README.md	Working LED example	1 month ago

README.md

GPIO Via Golang

Ok, we are going to try the golang periph library with this.

Permissions

The user running this binary must have gpio permissions on the Raspberry Pi.

Check if you can read the device without being root

head -c 1 /dev/gpiomem > /dev/null && echo "Success" || echo "Access Denied"

If you get access denied then we can create a gpio user group with udev runs that grant permissions to the /dev/gpiomem device.

sudo groupadd gpio
sudo usermod -aG gpio $USER

Create a udev rules file

sudo vim /etc/udev/rules.d/99-gpio.rules

Include the following:

# Access to the memory-mapped GPIO
SUBSYSTEM=="bcm2835-gpiomem", KERNEL=="gpiomem", GROUP="gpio", MODE="0660"

# Access to the gpiochip character devices (periph.io uses these)
SUBSYSTEM=="gpio", KERNEL=="gpiochip*", GROUP="gpio", MODE="0660"

sudo udevadm control --reload-rules && sudo udevadm trigger

Periph Library

The Periph library is broken up into a number of sub libraries that are imported as needed. This allows the developers to decouple board implementations from drivers and devices.

go get periph.io/x/host/v3
go get periph.io/x/conn/v3