libhwpwm

An easy to use library to communicate with the Linux kernel's sysfs PWM interface.

Documentation

libhwpwm is documented using man-pages. See man 3 libhwpwm.h

Requirements

• A Linux system
• make
• C99 compiler
• scdoc for generating man-pages

Accessing PWMs without root

libhwpwm only exposes the sysfs interface as an easy to use C API, it does not handle permissions.

In order to run programs that use libhwpwm without being root, you can use a udev rule like this:

SUBSYSTEM=="pwm", MODE="0666"

This rule would allow any user to run programs using this library.

Warning

It's probably not a good idea to grant global R/W access to sysfs nodes.