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-- Copyright (c)2013, 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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-- 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 : o8_btn_int
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-- VHDL Units : o8_btn_int
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-- Description: Detects and reports when a user pushbutton is pressed with an
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-- Description: Detects and reports when a user pushbutton is pressed with an
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-- interrupt.
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-- interrupt.
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--
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-- Register Map:
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-- Offset Bitfield Description Read/Write
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-- 0x00 AAAAAAAA Current Button State (RW)
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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 01/22/20 Re-write of original with separate debouncer
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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_arith.all;
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use ieee.std_logic_arith.all;
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architecture behave of o8_btn_int is
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architecture behave of o8_btn_int is
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constant User_Addr : std_logic_vector(15 downto 0) := Address;
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constant User_Addr : std_logic_vector(15 downto 0) := Address;
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alias Comp_Addr is Bus_Address(15 downto 0);
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alias Comp_Addr is Bus_Address(15 downto 0);
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signal Addr_Match : std_logic;
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signal Addr_Match : std_logic := '0';
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signal Rd_En : std_logic;
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signal Rd_En : std_logic := '0';
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constant MSEC_DELAY : std_logic_vector(9 downto 0) :=
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constant MSEC_DELAY : std_logic_vector(9 downto 0) :=
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conv_std_logic_vector(1000,10);
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conv_std_logic_vector(1000,10);
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signal mSec_Timer : std_logic_vector(9 downto 0);
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signal mSec_Timer : std_logic_vector(9 downto 0) := (others => '0');
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signal mSec_Tick : std_logic;
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signal mSec_Tick : std_logic := '0';
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signal Button_Pressed : DATA_TYPE := x"00";
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signal Button_Pressed : DATA_TYPE := x"00";
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signal Button_CoS : DATA_TYPE := x"00";
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signal Button_CoS : DATA_TYPE := x"00";
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begin
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begin
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