Overview :: News :: Downloads :: Tracker :: Discussions (cores)

keyboardcontroller: Overview Details Name: keyboardcontroller Created: 01-Jul-2005 14:43:21 Updated: 06-Jul-2005 03:52:17 CVS: browse Other project properties Category :: Other Language :: VHDL License :: GPL Phaze :: FPGA proven Development status :: Production/Stable Project maintainers Wouter Wiggers Statistics view Description The controller scans the keyboard by making a different column in "rows" logic-0 therefor the inputs "cols" have to be PULL-UP high. It processes the inputs "cols" and the newly found keychange (keypress or keyrelease) is converted to the corresponding scancode (translated set2). Note that an interrupt pin is attached as well to make it possible to connect this controller to a PIC. Also note that the keyboard_controller uses an internal clock divider to divide the system clock of 50 Mhz to 100 kHz. Should you want to use an other frequency than 100 kHz please do not forget to change Constants.vhd Features Simple debounce algorithm, it checks for stable inputs in last #nr samples Ghosting protection Module is easy to understand and build out of sub-modules Status Currently used for input processing of a toy-keyboard