-- Copyright (c)2020 Jeremy Seth Henry
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-- Copyright (c)2020 Jeremy Seth Henry
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-- All rights reserved.
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-- All rights reserved.
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--
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--
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-- Redistribution and use in source and binary forms, with or without
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-- Redistribution and use in source and binary forms, with or without
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-- modification, are permitted provided that the following conditions are met:
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-- modification, are permitted provided that the following conditions are met:
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-- * Redistributions of source code must retain the above copyright
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-- * Redistributions of source code must retain the above copyright
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-- notice, this list of conditions and the following disclaimer.
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-- notice, this list of conditions and the following disclaimer.
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-- * Redistributions in binary form must reproduce the above copyright
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-- * Redistributions in binary form must reproduce the above copyright
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-- notice, this list of conditions and the following disclaimer in the
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-- notice, this list of conditions and the following disclaimer in the
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-- documentation and/or other materials provided with the distribution,
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-- documentation and/or other materials provided with the distribution,
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-- where applicable (as part of a user interface, debugging port, etc.)
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-- where applicable (as part of a user interface, debugging port, etc.)
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--
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--
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-- THIS SOFTWARE IS PROVIDED BY JEREMY SETH HENRY ``AS IS'' AND ANY
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-- THIS SOFTWARE IS PROVIDED BY JEREMY SETH HENRY ``AS IS'' AND ANY
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-- EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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-- EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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-- WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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-- WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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-- DISCLAIMED. IN NO EVENT SHALL JEREMY SETH HENRY BE LIABLE FOR ANY
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-- DISCLAIMED. IN NO EVENT SHALL JEREMY SETH HENRY BE LIABLE FOR ANY
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-- DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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-- DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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-- (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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-- (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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-- LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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-- LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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-- ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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-- ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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-- (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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-- (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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-- THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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-- THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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--
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--
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-- VHDL Units : button_db
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-- VHDL Units : button_db
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-- Description: Debounces a single button/switch and provides a change of
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-- Description: Debounces a single button/switch and provides a change of
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-- state signal as well as registered level.
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-- state signal as well as registered level.
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--
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-- Revision History
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-- Author Date Change
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------------------ -------- ---------------------------------------------------
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-- Seth Henry 04/14/20 Code cleanup and revision section added
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library ieee;
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library ieee;
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use ieee.std_logic_1164.all;
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use ieee.std_logic_1164.all;
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use ieee.std_logic_unsigned.all;
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use ieee.std_logic_unsigned.all;
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use ieee.std_logic_misc.all;
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use ieee.std_logic_misc.all;
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entity button_db is
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entity button_db is
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generic(
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generic(
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Button_Level : std_logic;
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Button_Level : std_logic;
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Reset_Level : std_logic
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Reset_Level : std_logic
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);
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);
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port(
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port(
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Clock : in std_logic;
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Clock : in std_logic;
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Reset : in std_logic;
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Reset : in std_logic;
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mSec_Tick : in std_logic;
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mSec_Tick : in std_logic;
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--
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--
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Button_In : in std_logic;
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Button_In : in std_logic;
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--
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--
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Button_Pressed : out std_logic;
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Button_Pressed : out std_logic;
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Button_CoS : out std_logic
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Button_CoS : out std_logic
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);
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);
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end entity;
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end entity;
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architecture behave of button_db is
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architecture behave of button_db is
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signal Button_SR : std_logic_vector(2 downto 0);
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signal Button_SR : std_logic_vector(2 downto 0);
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alias Button_In_q is Button_SR(2);
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alias Button_In_q is Button_SR(2);
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signal Button_Dn_Tmr : std_logic_vector(5 downto 0);
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signal Button_Dn_Tmr : std_logic_vector(5 downto 0);
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signal Button_Dn : std_logic;
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signal Button_Dn : std_logic;
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signal Button_Up_Tmr : std_logic_vector(5 downto 0);
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signal Button_Up_Tmr : std_logic_vector(5 downto 0);
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signal Button_Up : std_logic;
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signal Button_Up : std_logic;
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signal Button_State : std_logic;
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signal Button_State : std_logic;
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signal Button_State_q : std_logic;
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signal Button_State_q : std_logic;
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begin
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begin
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Button_Pressed <= Button_State_q;
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Button_Pressed <= Button_State_q;
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Button_trap: process( Clock, Reset )
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Button_trap: process( Clock, Reset )
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begin
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begin
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if( Reset = Reset_Level )then
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if( Reset = Reset_Level )then
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Button_SR <= (others => '0');
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Button_SR <= (others => '0');
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Button_Dn_Tmr <= (others => '0');
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Button_Dn_Tmr <= (others => '0');
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Button_Dn <= '0';
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Button_Dn <= '0';
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Button_Up_Tmr <= (others => '0');
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Button_Up_Tmr <= (others => '0');
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Button_Up <= '0';
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Button_Up <= '0';
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Button_State <= '0';
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Button_State <= '0';
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Button_State_q <= '0';
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Button_State_q <= '0';
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Button_CoS <= '0';
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Button_CoS <= '0';
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elsif( rising_edge(Clock) )then
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elsif( rising_edge(Clock) )then
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Button_SR <= Button_SR(1 downto 0) & Button_In;
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Button_SR <= Button_SR(1 downto 0) & Button_In;
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Button_Dn_Tmr <= (others => '0');
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Button_Dn_Tmr <= (others => '0');
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Button_Dn <= '0';
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Button_Dn <= '0';
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if( Button_In_q = Button_Level )then
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if( Button_In_q = Button_Level )then
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Button_Dn_Tmr <= Button_Dn_Tmr + mSec_Tick;
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Button_Dn_Tmr <= Button_Dn_Tmr + mSec_Tick;
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if( and_reduce(Button_Dn_Tmr) = '1' )then
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if( and_reduce(Button_Dn_Tmr) = '1' )then
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Button_Dn_Tmr <= Button_Dn_Tmr;
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Button_Dn_Tmr <= Button_Dn_Tmr;
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Button_Dn <= '1';
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Button_Dn <= '1';
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end if;
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end if;
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end if;
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end if;
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Button_Up_Tmr <= (others => '0');
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Button_Up_Tmr <= (others => '0');
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Button_Up <= '0';
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Button_Up <= '0';
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if( Button_In_q = not Button_Level )then
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if( Button_In_q = not Button_Level )then
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Button_Up_Tmr <= Button_Up_Tmr + mSec_Tick;
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Button_Up_Tmr <= Button_Up_Tmr + mSec_Tick;
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if( and_reduce(Button_Up_Tmr) = '1' )then
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if( and_reduce(Button_Up_Tmr) = '1' )then
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Button_Up_Tmr <= Button_Up_Tmr;
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Button_Up_Tmr <= Button_Up_Tmr;
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Button_Up <= '1';
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Button_Up <= '1';
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end if;
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end if;
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end if;
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end if;
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if( Button_Dn = '1' )then
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if( Button_Dn = '1' )then
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Button_State <= '1';
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Button_State <= '1';
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elsif( Button_Up = '1' )then
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elsif( Button_Up = '1' )then
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Button_State <= '0';
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Button_State <= '0';
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end if;
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end if;
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Button_State_q <= Button_State;
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Button_State_q <= Button_State;
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Button_CoS <= Button_State xor Button_State_q;
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Button_CoS <= Button_State xor Button_State_q;
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end if;
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end if;
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end process;
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end process;
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