'LEDs' Tag

  • The shortcomings of the Linux LEDs API

    September 4, 2009

    In a recent post I mentioned that the Linux kernel has a dedicated API for LEDs. This API is composed of the drivers/leds/ directory and the additional <linux/leds.h> include file, Documentation exists in form of the Documentation/leds-class.txt file. To quote: “The underlying design philosophy is simplicity. LEDs are simple devices and the aim is to […]

  • Adding four custom status LEDs to the EPIA MII

    August 19, 2009

    In the course of my little EPIA MII project, I have to interface four custom LEDs which I connected to the MII’s internal parallel port connector. The LEDs are tri-state LEDs, that is, they can not be just turned on or off but can show three different colors, hence the name tri-state LEDs. The particular […]

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