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-- $Id: sn_humanio_demu.vhd 649 2015-02-21 21:10:16Z mueller $ -- -- Copyright 2011- by Walter F.J. Mueller <W.F.J.Mueller@gsi.de> -- -- This program is free software; you may redistribute and/or modify it under -- the terms of the GNU General Public License as published by the Free -- Software Foundation, either version 2, 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 complete details. -- ------------------------------------------------------------------------------ -- Module Name: sn_humanio_demu - syn -- Description: All BTN, SWI, LED handling for atlys -- -- Dependencies: bpgen/bp_swibtnled -- -- Test bench: - -- -- Target Devices: generic -- Tool versions: xst 13.1-14.7; ghdl 0.29-0.31 -- -- Synthesized (xst): -- Date Rev ise Target flop lutl lutm slic t peri -- 2011-10-10 413 13.1 O40d xc3s1000-4 67 66 0 55 s 6.1 ns -- -- Revision History: -- Date Rev Version Comment -- 2011-10-11 414 1.0.1 take care of RESET BTN being active low -- 2011-10-10 413 1.0 Initial version ------------------------------------------------------------------------------ -- library ieee; use ieee.std_logic_1164.all; use ieee.numeric_std.all; use work.slvtypes.all; use work.bpgenlib.all; -- ---------------------------------------------------------------------------- entity sn_humanio_demu is -- human i/o handling: swi,btn,led only generic ( DEBOUNCE : boolean := true); -- instantiate debouncer for SWI,BTN port ( CLK : in slbit; -- clock RESET : in slbit := '0'; -- reset CE_MSEC : in slbit; -- 1 ms clock enable SWI : out slv8; -- switch settings, debounced BTN : out slv4; -- button settings, debounced LED : in slv8; -- led data DSP_DAT : in slv16; -- display data DSP_DP : in slv4; -- display decimal points I_SWI : in slv8; -- pad-i: switches I_BTN : in slv6; -- pad-i: buttons O_LED : out slv8 -- pad-o: leds ); end sn_humanio_demu; architecture syn of sn_humanio_demu is constant c_mode_led : slv2 := "00"; constant c_mode_dp : slv2 := "01"; constant c_mode_datl : slv2 := "10"; constant c_mode_dath : slv2 := "11"; type regs_type is record mode : slv2; -- current mode cnt : slv9; -- msec counter up_1 : slbit; -- btn up last cycle dn_1 : slbit; -- btn dn last cycle led : slv8; -- led state end record regs_type; constant regs_init : regs_type := ( c_mode_led, -- mode (others=>'0'), -- cnt '0','0', -- up_1, dn_1 (others=>'0') -- led ); signal R_REGS : regs_type := regs_init; -- state registers signal N_REGS : regs_type := regs_init; -- next value state regs signal BTN_HW : slv6 := (others=>'0'); signal LED_HW : slv8 := (others=>'0'); begin HIO : bp_swibtnled generic map ( SWIDTH => 8, BWIDTH => 6, LWIDTH => 8, DEBOUNCE => DEBOUNCE) port map ( CLK => CLK, RESET => RESET, CE_MSEC => CE_MSEC, SWI => SWI, BTN => BTN_HW, LED => LED_HW, I_SWI => I_SWI, I_BTN => I_BTN, O_LED => O_LED ); proc_regs: process (CLK) begin if rising_edge(CLK) then if RESET = '1' then R_REGS <= regs_init; else R_REGS <= N_REGS; end if; end if; end process proc_regs; proc_next: process (R_REGS, CE_MSEC, LED, DSP_DAT, DSP_DP, BTN_HW) variable r : regs_type := regs_init; variable n : regs_type := regs_init; variable ibtn : slv4 := (others=>'0'); variable iup : slbit := '0'; variable idn : slbit := '0'; variable ipuls : slbit := '0'; begin r := R_REGS; n := R_REGS; ibtn(0) := not BTN_HW(5); -- RESET button is act. low ! ibtn(1) := BTN_HW(1); ibtn(2) := BTN_HW(4); ibtn(3) := BTN_HW(3); iup := BTN_HW(0); idn := BTN_HW(2); ipuls := '0'; n.up_1 := iup; n.dn_1 := idn; if iup='0' and idn='0' then n.cnt := (others=>'0'); else if CE_MSEC = '1' then n.cnt := slv(unsigned(r.cnt) + 1); if r.cnt = "111111111" then ipuls := '1'; end if; end if; end if; if iup='1' or idn='1' then n.led := (others=>'0'); case r.mode is when c_mode_led => n.led(0) := '1'; when c_mode_dp => n.led(1) := '1'; when c_mode_datl => n.led(2) := '1'; when c_mode_dath => n.led(3) := '1'; when others => null; end case; if iup='1' and (r.up_1='0' or ipuls='1') then n.mode := slv(unsigned(r.mode) + 1); elsif idn='1' and (r.dn_1='0' or ipuls='1') then n.mode := slv(unsigned(r.mode) - 1); end if; else case r.mode is when c_mode_led => n.led := LED; when c_mode_dp => n.led := "0000" & DSP_DP; when c_mode_datl => n.led := DSP_DAT( 7 downto 0); when c_mode_dath => n.led := DSP_DAT(15 downto 8); when others => null; end case; end if; N_REGS <= n; BTN <= ibtn; LED_HW <= r.led; end process proc_next; end syn;