RetroBSD

2.11BSD operating system for microcontrollers
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 Post subject: GPIO driver
PostPosted: Sat Feb 04, 2012 12:23 pm 
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Joined: Wed Oct 10, 2012 11:01 pm
Posts: 1081
Location: Sunnyvale, CA
GPIO driver and portio utility are described on Wiki page: http://retrobsd.org/wiki/documentation-2/kernel-drivers/gpio/

The driver also supports one additional ioctl code GPIO_LOL, which displays a bit image 9x14 on a LoL shield, for a given number of milliseconds. A /bin/lol utility can be used for displaying an arbitrary text string on LoL shield, or showing some simple demos.

LoL shield is a simple fanny LED display matrix, which you can buy from a number of suppliers or make yourself. Some links:
http://jimmieprodgers.com/kits/lolshield/
http://www.adafruit.com/products/274
http://www.olimex.com/dev/shield-lol.html
http://www.sparkfun.com/products/9796
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