Merge pull request #25 from benjamin051000/hotfix-lab2-7seg

Reversed decodings to be more in-line with pin layout & manuals. Also, revamped tb for conciseness.

modelsim-projects/Lab2/decoder7seg_true_testbench.vhd

@@ -1,111 +1,70 @@
-
--- Greg Stitt
--- University of Florida
-
 library ieee;
 use ieee.std_logic_1164.all;
-use ieee.std_logic_arith.all;
-use ieee.std_logic_unsigned.all;
+use ieee.numeric_std.all;
 
 entity decoder7seg_true_testbench is  
 end decoder7seg_true_testbench;
 
 architecture TB of decoder7seg_true_testbench is
 
-
-  component decoder7seg
-
+    component decoder7seg
     port (
-	input  : in  std_logic_vector(3 downto 0);
-	output : out std_logic_vector(6 downto 0));
-
-  end component;
-
-  -- Input
-  signal input  : std_logic_vector(3 downto 0);
-
-  -- Output
-  signal output : std_logic_vector(6 downto 0); 
-
+        input  : in  std_logic_vector(3 downto 0);
+        output : out std_logic_vector(6 downto 0)
+    );
+    end component;
+
+    -- Driver
+    signal input : std_logic_vector(3 downto 0);
+
+    signal output, correct : std_logic_vector(6 downto 0); 
+
+
+    type decoded_values_arr is array(0 to 15) of std_logic_vector(6 downto 0);
+
+    -- Active-low 7-segment decodings.
+    constant decoded_values: decoded_values_arr := (
+        -- msb .. lsb
+        "1000000", -- 0
+        "1111001", -- 1 
+        "0100100", -- 2
+        "0110000", -- 3
+        "0011001", -- 4
+        "0010010", -- 5
+        "0000010", -- 6
+        "1111000", -- 7
+        "0000000", -- 8
+        "0011000", -- 9 
+        "0001000", -- 10 A
+        "0000011", -- 11 B
+        "1000110", -- 12 C 
+        "0100001", -- 13 D 
+        "0000110", -- 14 E
+        "0001110"  -- 15 F
+    );
+
 begin  -- TB
 
-  UUT : decoder7seg
+    UUT: decoder7seg
     port map (
-      input  => input,
-      output => output);
+        input  => input,
+        output => output
+    );
 
-  process
-  begin
+    process begin
 
-        input    <= "0000";
-        wait for 40 ns;
-        assert(output = ("0000001")) report "0 failed";
-
-        input    <= "0001";
-        wait for 40 ns;
-        assert(output = ("1001111")) report "1 failed";
-
-        input    <= "0010";
-        wait for 40 ns;
-        assert(output = ("0010010")) report "2 failed";
-
-        input    <= "0011";
-        wait for 40 ns;
-        assert(output = ("0000110")) report "3 failed";
-
-        input    <= "0100";
-        wait for 40 ns;
-        assert(output = ("1001100")) report "4 failed";
-
-        input    <= "0101";
-        wait for 40 ns;
-        assert(output = ("0100100")) report "5 failed";
-
-        input    <= "0110";
-        wait for 40 ns;
-        assert(output = ("0100000")) report "6 failed";
-
-        input    <= "0111";
-        wait for 40 ns;
-        assert(output = ("0001111")) report "7 failed";
-
-        input    <= "1000";
-        wait for 40 ns;
-        assert(output = ("0000000")) report "8 failed";
-
-        input    <= "1001";
-        wait for 40 ns;
-        assert(output = ("0001100")) report "9 failed";
-
-        input    <= "1010";
-        wait for 40 ns;
-        assert(output = ("0001000")) report "A failed";
-
-        input    <= "1011";
-        wait for 40 ns;
-        assert(output = ("1100000")) report "B failed";
-
-        input    <= "1100";
-        wait for 40 ns;
-        assert(output = ("0110001")) report "C failed";
-
-        input    <= "1101";
-        wait for 40 ns;
-        assert(output = ("1000010")) report "D failed";
-
-        input    <= "1110";
-        wait for 40 ns;
-        assert(output = ("0110000")) report "E failed";
-
-        input    <= "1111";
-        wait for 40 ns;
-        assert(output = ("0111000")) report "F failed";
-
-        report "SIMLUATION FINISHED!";
+        for i in 0 to 15 loop
+            correct <= decoded_values(i);
+            input <= std_logic_vector(to_unsigned(i, 4)); -- Make i a 4-bit vector
+
+            wait for 10 ns;
+
+            assert(output = correct) report "Incorrect decoding for " & integer'image(i);
+        end loop;
 
-    wait;
-
-  end process;
-
+        report "Done. Goodbye.";
+        wait;
+    end process;
 
 end TB;
+