keyboardcontroller :: Overview
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Details
Name: keyboardcontroller
Created: Jul 1, 2005
Updated: May 3, 2011
SVN Updated: Mar 10, 2009
SVN: Browse
Latest version: download
Statistics: View
Other project properties
Category: Other
Language: VHDL
Development status: Stable
Additional info:
FPGA proven
WishBone Compliant: No
License: GPL
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