add test beches

clipping_tb.v

@@ -0,0 +1,85 @@
+// This file is Test Bench for clipping module
+//  
+// 
+
+// 100MHz clock on Basys3 -> 10ns period
+// 50% duty cycle 5ns HIGH and 5ns LOW
+//`timescale [time unit] / [time precision]
+`timescale 10 ns / 1ns
+
+//sub modules
+`include "clipping.v"
+
+module clipping_tb#( parameter
+    data_width = 16          // data width 
+)();
+
+reg clk = 1'b0;
+reg signed [data_width-1 : 0]  i_data = 'b0; 
+reg i_read_done = 0;
+reg i_data_ready = 0;
+
+// 50% duty cycle clock
+always #0.5 clk <= ~clk;
+
+clipping_effect  #(
+    .data_width(data_width)                // data width
+) UUT (
+    .clk(clk),
+    .reset(1'b0),
+    .i_treshhold( 16'haff ),
+    .i_data(i_data),
+    .i_read_done(i_read_done),         // read done from effects controler
+    .i_data_ready(i_data_ready),
+    .o_data(),
+    .o_read_enable(),
+    .o_data_valid()  
+);
+
+initial begin
+    #030; 
+    i_data  = 'haaa;
+    #005;
+    i_data_ready = 1;
+    #005;
+    i_data  = 'h0fa;
+    #002;
+    i_read_done = 1;
+    #001;
+    i_read_done = 0;
+    #005;
+    i_data  =  -16'd3000;
+    #002;
+    i_read_done = 1;
+    #001;
+    i_read_done = 0;
+    #005;
+    i_data  =  852;
+    #002;
+    i_read_done = 1;
+    #001;
+    i_read_done = 0;
+end
+
+
+initial begin
+    #030_000; 
+    $display("*");
+
+    $display(" ");
+    $display("Use this command to open timing diagram:");
+    $display("gtkwave -f wave.vcd");
+    $display("----------------------------------------------");
+    $finish();
+end
+
+initial 
+  begin 
+    $display(" ");
+    $display("----------------------------------------------");
+    $display("          Starting Testbench...");
+    $dumpfile("wave.vcd");
+    $dumpvars(0);
+end
+
+endmodule