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-- Copyright (C) 2002 Morgan Kaufmann Publishers, Inc
-- This file is part of VESTs (Vhdl tESTs).
-- VESTs 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.
-- VESTs 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 VESTs; if not, write to the Free Software Foundation,
-- Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
ENTITY ball_wa IS
END ENTITY ball_wa;
ARCHITECTURE simple OF ball_wa IS
QUANTITY v: real;
QUANTITY s: real;
CONSTANT G: real := 9.81;
CONSTANT Air_Res: real := 0.1;
SIGNAL damping: real := -0.7;
signal v_at_impact : real:= 0.0;
signal impact: boolean;
BEGIN
if domain = quiescent_domain use
v == 0.0;
s == 30.0;
elsif impact use
v == damping*v_at_impact;
s == 0.0;
else
s'dot == v;
v'dot == -G;
end use;
process begin
wait until not s'above(0.0);
if v < -1.0e-9 then
v_at_impact <= v;
impact <= true, false after 1 us;
else
damping <= 0.0;
impact <= true;
end if;
end process;
break on impact;
END architecture simple;
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