hardware Raspberry Pi • View topic – Write a niibble or byte to GPIO michael March 14, 2014 http://www.raspberrypi.org/phpBB3/viewtopic.php?f=32&t=17305
hardware WiringPi michael March 14, 2014 LINK HERE https://projects.drogon.net/raspberry-pi/wiringpi/the-gpio-utility/
michael