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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 stimulus_interpreter is
end entity stimulus_interpreter;
architecture test of stimulus_interpreter is
quantity temperature : real;
signal temp_sig, setting : real;
signal enable, heater_fail : bit;
begin
-- code from book
stimulus_interpreter : process is
use std.textio.all;
file control : text open read_mode is "control";
variable command : line;
variable read_ok : boolean;
variable next_time : time;
variable whitespace : character;
variable signal_id : string(1 to 4);
variable temp_value, set_value : real;
variable on_value, fail_value : bit;
begin
command_loop : while not endfile(control) loop
readline ( control, command );
-- read next stimulus time, and suspend until then
read ( command, next_time, read_ok );
if not read_ok then
report "error reading time from line: " & command.all
severity warning;
next command_loop;
end if;
wait for next_time - now;
-- skip whitespace
while command'length > 0
and ( command(command'left) = ' ' -- ordinary space
or command(command'left) = ' ' -- non-breaking space
or command(command'left) = HT ) loop
read ( command, whitespace );
end loop;
-- read signal identifier string
read ( command, signal_id, read_ok );
if not read_ok then
report "error reading signal id from line: " & command.all
severity warning;
next command_loop;
end if;
-- dispatch based on signal id
case signal_id is
when "temp" =>
read ( command, temp_value, read_ok );
if not read_ok then
report "error reading temperature value from line: "
& command.all
severity warning;
next command_loop;
end if;
temp_sig <= temp_value;
when "set " =>
-- . . . -- similar to "temp"
-- not in book
read ( command, set_value, read_ok );
if not read_ok then
report "error reading setting value from line: "
& command.all
severity warning;
next command_loop;
end if;
setting <= set_value;
-- end not in book
when "on " =>
read ( command, on_value, read_ok );
if not read_ok then
report "error reading on value from line: "
& command.all
severity warning;
next command_loop;
end if;
enable <= on_value;
when "fail" =>
-- . . . -- similar to "on "
-- not in book
read ( command, fail_value, read_ok );
if not read_ok then
report "error reading fail value from line: "
& command.all
severity warning;
next command_loop;
end if;
heater_fail <= fail_value;
-- end not in book
when others =>
report "invalid signal id in line: " & signal_id
severity warning;
next command_loop;
end case;
end loop command_loop;
wait;
end process stimulus_interpreter;
-- end code from book
-- code from book (in text)
temperature == temp_sig'ramp;
-- end code from book (in text)
end architecture test;
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