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[/] [open8_urisc/] [trunk/] [VHDL/] [o8_switch_if.vhd] - Rev 264
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-- Copyright (c)2020 Jeremy Seth Henry -- All rights reserved. -- -- Redistribution and use in source and binary forms, with or without -- modification, are permitted provided that the following conditions are met: -- * Redistributions of source code must retain the above copyright -- notice, this list of conditions and the following disclaimer. -- * Redistributions in binary form must reproduce the above copyright -- notice, this list of conditions and the following disclaimer in the -- documentation and/or other materials provided with the distribution, -- where applicable (as part of a user interface, debugging port, etc.) -- -- THIS SOFTWARE IS PROVIDED BY JEREMY SETH HENRY ``AS IS'' AND ANY -- EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED -- WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE -- DISCLAIMED. IN NO EVENT SHALL JEREMY SETH HENRY BE LIABLE FOR ANY -- DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES -- (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; -- LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND -- ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT -- (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF -- THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. -- -- VHDL Units : o8_switch_if -- Description: Based on the Debounce_Enable bit, either detects and reports -- when a user pushbutton is pressed with an interrupt or -- simply makes the switch status available. -- -- Register Map: -- Offset Bitfield Description Read/Write -- 0x00 AAAAAAAA Current Switch State (RW) -- -- Revision History -- Author Date Change ------------------ -------- --------------------------------------------------- -- Seth Henry 01/22/20 Re-write of original with separate debouncer -- Seth Henry 04/16/20 Modified to use Open8 bus record library ieee; use ieee.std_logic_1164.all; use ieee.std_logic_unsigned.all; use ieee.std_logic_arith.all; use ieee.std_logic_misc.all; library work; use work.open8_pkg.all; entity o8_switch_if is generic( Debounce_Enables : DATA_TYPE := x"00"; Switch_Levels : DATA_TYPE := x"00"; Address : ADDRESS_TYPE := x"0000" ); port( Open8_Bus : in OPEN8_BUS_TYPE; Rd_Data : out DATA_TYPE; Interrupt : out std_logic; -- Switch_In : in DATA_TYPE := x"00" ); end entity; architecture behave of o8_switch_if is alias Clock is Open8_Bus.Clock; alias Reset is Open8_Bus.Reset; alias uSec_Tick is Open8_Bus.uSec_Tick; constant User_Addr : std_logic_vector(15 downto 0) := Address; alias Comp_Addr is Open8_Bus.Address(15 downto 0); signal Addr_Match : std_logic := '0'; signal Rd_En_d : std_logic := '0'; signal Rd_En_q : std_logic := '0'; constant MSEC_DELAY : std_logic_vector(9 downto 0) := conv_std_logic_vector(1000,10); signal mSec_Timer : std_logic_vector(9 downto 0) := (others => '0'); signal mSec_Tick : std_logic := '0'; signal Button_Pressed : DATA_TYPE := x"00"; signal Button_CoS : DATA_TYPE := x"00"; begin Addr_Match <= '1' when Comp_Addr = User_Addr else '0'; Rd_En_d <= Addr_Match and Open8_Bus.Rd_En; io_reg: process( Clock, Reset ) begin if( Reset = Reset_Level )then Rd_En_q <= '0'; Rd_Data <= OPEN8_NULLBUS; Interrupt <= '0'; elsif( rising_edge( Clock ) )then Rd_En_q <= Rd_En_d; Rd_Data <= OPEN8_NULLBUS; if( Rd_En_q = '1' )then Rd_Data <= Button_Pressed; end if; Interrupt <= or_reduce(Button_CoS); end if; end process; mSec_proc: process( Clock, Reset ) begin if( Reset = Reset_Level )then mSec_Timer <= (others => '0'); mSec_Tick <= '0'; elsif( rising_edge(Clock) )then mSec_Timer <= mSec_Timer - uSec_Tick; mSec_Tick <= '0'; if( mSec_Timer = 0 )then mSec_Timer <= MSEC_DELAY; mSec_Tick <= '1'; end if; end if; end process; Create_Debouncers: for i in 0 to 7 generate Debouncer_Enabled: if( Debounce_Enables(i) = '1' )generate U_BTN : entity work.button_db generic map( Button_Level => Switch_Levels(i), Reset_Level => Reset_Level ) port map( Clock => Clock, Reset => Reset, mSec_Tick => mSec_Tick, -- Button_In => Switch_In(i), -- Button_Pressed => Button_Pressed(i), Button_CoS => Button_CoS(i) ); end generate; Debouncer_Disabled: if( Debounce_Enables(i) = '0' )generate Button_Pressed(i) <= Switch_In(i); Button_CoS(i) <= '0'; end generate; end generate; end architecture;
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