Added data length code feature test

test/feature/data_length_code_feature_tb.vhd

+--------------------------------------------------------------------------------
+--
+-- CTU CAN FD IP Core
+-- Copyright (C) 2015-2018 Ondrej Ille <ondrej.ille@gmail.com>
+--
+-- Project advisors and co-authors:
+-- 	Jiri Novak <jnovak@fel.cvut.cz>
+-- 	Pavel Pisa <pisa@cmp.felk.cvut.cz>
+-- 	Martin Jerabek <jerabma7@fel.cvut.cz>
+-- Department of Measurement         (http://meas.fel.cvut.cz/)
+-- Faculty of Electrical Engineering (http://www.fel.cvut.cz)
+-- Czech Technical University        (http://www.cvut.cz/)
+--
+-- Permission is hereby granted, free of charge, to any person obtaining a copy
+-- of this VHDL component and associated documentation files (the "Component"),
+-- to deal in the Component without restriction, including without limitation
+-- the rights to use, copy, modify, merge, publish, distribute, sublicense,
+-- and/or sell copies of the Component, and to permit persons to whom the
+-- Component is furnished to do so, subject to the following conditions:
+--
+-- The above copyright notice and this permission notice shall be included in
+-- all copies or substantial portions of the Component.
+--
+-- THE COMPONENT IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+-- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+-- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+-- AUTHORS OR COPYRIGHTHOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+-- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+-- FROM, OUT OF OR IN CONNECTION WITH THE COMPONENT OR THE USE OR OTHER DEALINGS
+-- IN THE COMPONENT.
+--
+-- The CAN protocol is developed by Robert Bosch GmbH and protected by patents.
+-- Anybody who wants to implement this IP core on silicon has to obtain a CAN
+-- protocol license from Bosch.
+--
+--------------------------------------------------------------------------------
+
+--------------------------------------------------------------------------------
+-- Purpose:
+--  Data length Code feature test. Verifies functionality of maximal DLC equal
+--  to 8 for CAN 2.0 frames.
+--
+--  Test sequence:
+--    1. Generate CAN 2.0 Frame and set DLC higher than 8. Set higher data
+--       bytes accordingly!
+--    2. Send the CAN Frame via Node 1.
+--    3. Verify that frame received by Node 2, has only DLC 8 received and
+--       that higher data bytes are 0!
+--------------------------------------------------------------------------------
+-- Revision History:
+--    14.7.2018   Created file
+--------------------------------------------------------------------------------
+
+Library ieee;
+USE IEEE.std_logic_1164.all;
+USE IEEE.numeric_std.ALL;
+USE ieee.math_real.ALL;
+use work.CANconstants.all;
+USE work.CANtestLib.All;
+USE work.randomLib.All;
+use work.pkg_feature_exec_dispath.all;
+
+use work.CAN_FD_register_map.all;
+
+package data_length_code_feature is
+    procedure data_length_code_feature_exec(
+        variable    o               : out    feature_outputs_t;
+        signal      so              : out    feature_signal_outputs_t;
+        signal      rand_ctr        : inout  natural range 0 to RAND_POOL_SIZE;
+        signal      iout            : in     instance_outputs_arr_t;
+        signal      mem_bus         : inout  mem_bus_arr_t;
+        signal      bus_level       : in     std_logic
+    );
+end package;
+
+
+package body data_length_code_feature is
+    procedure data_length_code_feature_exec(
+        variable    o               : out    feature_outputs_t;
+        signal      so              : out    feature_signal_outputs_t;
+        signal      rand_ctr        : inout  natural range 0 to RAND_POOL_SIZE;
+        signal      iout            : in     instance_outputs_arr_t;
+        signal      mem_bus         : inout  mem_bus_arr_t;
+        signal      bus_level       : in     std_logic
+    ) is
+        constant ID_1               :        natural := 1;
+        constant ID_2               :        natural := 2;
+        variable CAN_frame          :        SW_CAN_frame_type;
+        variable CAN_frame_2        :        SW_CAN_frame_type  := 
+                    (0, (OTHERS => (OTHERS => '0')), "0000", 0, '0', '0',
+                     '0', '0', '0', (OTHERS => '0'), 0);
+        variable frame_sent         :        boolean;
+    begin
+        o.outcome := true;
+
+        ------------------------------------------------------------------------
+        -- Generate CAN Frame and force CAN 2.0 and DLC higher than 8!
+        ------------------------------------------------------------------------
+        CAN_generate_frame(rand_ctr, CAN_frame);
+        rand_logic_vect_v(rand_ctr, CAN_frame.dlc, 0.5);
+        CAN_frame.dlc(3) := '1';
+        CAN_frame.frame_format = NORMAL_CAN;
+        decode_dlc(CAN_frame.dlc, CAN_frame.data_length);
+        for i in 0 to data_length - 1 loop
+            rand_logic_vect_v(rand_ctr, CAN_frame.data(i), 0.5);
+        end loop;
+
+        ------------------------------------------------------------------------
+        -- Send frame by Node 1
+        ------------------------------------------------------------------------
+        CAN_send_frame(CAN_frame, 1, ID_1, mem_bus(1), frame_sent);
+        CAN_wait_frame_sent(ID_1, mem_bus(1));
+        wait for 500 ns;
+
+        ------------------------------------------------------------------------
+        -- Read frame by Node 2 and Check that DLC is equal to 8 and higher
+        -- data bytes are 0!
+        ------------------------------------------------------------------------
+        CAN_read_frame(CAN_frame_2, ID_2, mem_bus(2));
+        if (CAN_frame_2.dlc /= "1000") then
+            o.outcome := false;
+            report "Invalid DLC received!" severity error;
+        end if;
+
+        for i in 8 to 63 loop
+            if (CAN_frame_2.data(i) /= "00000000") then
+                report "Byte index " & integer'image(i) & " not zero!"
+                    severity error;
+            end if;
+        end loop;
+    );
+
+
+  end procedure;
+
+end package body;