LCD_CLK_GENERATOR.vhd
91 lines
| 2.3 KiB
| text/x-vhdl
|
VhdlLexer
Alexis
|
r1 | ------------------------------------------------------------------------------ | ||
-- This file is a part of the LPP VHDL IP LIBRARY | ||||
-- Copyright (C) 2009 - 2010, Laboratory of Plasmas Physic - CNRS | ||||
-- | ||||
-- This program is free software; you can redistribute it and/or modify | ||||
-- it under the terms of the GNU General Public License as published by | ||||
-- the Free Software Foundation; either version 2 of the License, or | ||||
-- (at your option) any later version. | ||||
-- | ||||
-- This program is distributed in the hope that it will be useful, | ||||
-- but WITHOUT ANY WARRANTY; without even the implied warranty of | ||||
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||||
-- GNU General Public License for more details. | ||||
-- | ||||
-- You should have received a copy of the GNU General Public License | ||||
-- along with this program; if not, write to the Free Software | ||||
-- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||||
------------------------------------------------------------------------------- | ||||
---------------------------------------------------------------------------------- | ||||
-- Company: | ||||
-- Engineer: | ||||
-- | ||||
-- Create Date: 08:52:25 10/18/2010 | ||||
-- Design Name: | ||||
-- Module Name: LCD_CLK_GENERATOR - Behavioral | ||||
-- Project Name: | ||||
-- Target Devices: | ||||
-- Tool versions: | ||||
-- Description: | ||||
-- | ||||
-- Dependencies: | ||||
-- | ||||
-- Revision: | ||||
-- Revision 0.01 - File Created | ||||
-- Additional Comments: | ||||
-- | ||||
---------------------------------------------------------------------------------- | ||||
library IEEE; | ||||
use IEEE.STD_LOGIC_1164.ALL; | ||||
use IEEE.NUMERIC_STD.ALL; | ||||
library lpp; | ||||
use lpp.amba_lcd_16x2_ctrlr.all; | ||||
entity LCD_CLK_GENERATOR is | ||||
generic(OSC_freqKHz : integer := 50000); | ||||
Port ( clk : in STD_LOGIC; | ||||
reset : in STD_LOGIC; | ||||
clk_1us : out STD_LOGIC); | ||||
end LCD_CLK_GENERATOR; | ||||
architecture ar_LCD_CLK_GENERATOR of LCD_CLK_GENERATOR is | ||||
Constant clk_1usTRIGER : integer := (OSC_freqKHz/2000)+1; | ||||
signal cpt1 : integer; | ||||
signal clk_1us_int : std_logic := '0'; | ||||
begin | ||||
clk_1us <= clk_1us_int; | ||||
process(reset,clk) | ||||
begin | ||||
if reset = '0' then | ||||
cpt1 <= 0; | ||||
clk_1us_int <= '0'; | ||||
elsif clk'event and clk = '1' then | ||||
if cpt1 = clk_1usTRIGER then | ||||
clk_1us_int <= not clk_1us_int; | ||||
cpt1 <= 0; | ||||
else | ||||
cpt1 <= cpt1 + 1; | ||||
end if; | ||||
end if; | ||||
end process; | ||||
end ar_LCD_CLK_GENERATOR; | ||||