Exploring BeagleBone: LKMs (by Derek Molloy)  V1.0
This project describes how you can build loadable kernel modules (LKMs) on your BeagleBone platform
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led Directory Reference
Directory dependency graph for led:


file  led.c
 A kernel module for controlling a simple LED (or any signal) that is connected to a GPIO. It is threaded in order that it can flash the LED. The sysfs entry appears at /sys/ebb/led49.