Add top level testbench for application_fpga_sim.v

hw/application_fpga/tb/tb_application_fpga_sim.v

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+//======================================================================
+//
+// tb_application_fpga_sim.v
+// -------------------------
+// Top level module of the application_fpga.
+// The design exposes a UART interface to allow a host to
+// send commands and receive responses as needed load, execute and
+// communicate with applications.
+//
+//
+// Copyright (C) 2022 - Tillitis AB
+// SPDX-License-Identifier: GPL-2.0-only
+//
+//======================================================================
+
+`timescale 1ns / 1ns
+
+module tb_application_fpga_sim ();
+
+  //----------------------------------------------------------------
+  // Internal constant and parameter definitions.
+  //----------------------------------------------------------------
+  parameter CLK_HALF_PERIOD = 1;
+  parameter CLK_PERIOD = 2 * CLK_HALF_PERIOD;
+
+  //----------------------------------------------------------------
+  // Register and Wire declarations.
+  //----------------------------------------------------------------
+  reg  tb_clk = 0;
+  wire tb_interface_rx;
+  reg  tb_interface_tx = 1'h1;  // Set to 1 to simulate inactive UART
+  wire tb_spi_ss;
+  wire tb_spi_sck;
+  wire tb_spi_mosi;
+  reg  tb_spi_miso;
+  reg  tb_touch_event;
+  reg  tb_app_gpio1;
+  reg  tb_app_gpio2;
+  wire tb_app_gpio3;
+  wire tb_app_gpio4;
+  wire tb_led_r;
+  wire tb_led_g;
+  wire tb_led_b;
+
+  //----------------------------------------------------------------
+  // Device Under Test.
+  //----------------------------------------------------------------
+  application_fpga_sim dut (
+      .clk(tb_clk),
+      .interface_rx(tb_interface_rx),
+      .interface_tx(tb_interface_tx),
+      .spi_ss(tb_spi_ss),
+      .spi_sck(tb_spi_sck),
+      .spi_mosi(tb_spi_mosi),
+      .spi_miso(tb_spi_miso),
+      .touch_event(tb_touch_event),
+      .app_gpio1(tb_app_gpio1),
+      .app_gpio2(tb_app_gpio2),
+      .app_gpio3(tb_app_gpio3),
+      .app_gpio4(tb_app_gpio4),
+      .led_r(tb_led_r),
+      .led_g(tb_led_g),
+      .led_b(tb_led_b)
+  );
+
+  //----------------------------------------------------------------
+  // clk_gen
+  //
+  // Always running clock generator process.
+  //----------------------------------------------------------------
+  always begin : clk_gen
+    #CLK_HALF_PERIOD;
+    tb_clk = !tb_clk;
+  end  // clk_gen
+
+  //----------------------------------------------------------------
+  // finish
+  //
+  // End simulation
+  //----------------------------------------------------------------
+  initial begin
+    // End simulation after XXX time units (set by timescale)
+    #20000000;
+    $display("TIMEOUT");
+    $finish;
+  end
+
+  //----------------------------------------------------------------
+  // Fill memories with data
+  //----------------------------------------------------------------
+  initial begin
+    $readmemh("tb/output_spram0.hex", dut.ram_inst.spram0.mem);
+    $readmemh("tb/output_spram1.hex", dut.ram_inst.spram1.mem);
+    $readmemh("tb/output_spram2.hex", dut.ram_inst.spram2.mem);
+    $readmemh("tb/output_spram3.hex", dut.ram_inst.spram3.mem);
+  end
+
+  //----------------------------------------------------------------
+  // dumpfile
+  //
+  // Save waveform file
+  //----------------------------------------------------------------
+  initial begin
+    $dumpfile("tb_application_fpga_sim.fst");
+    $dumpvars(0, tb_application_fpga_sim);
+  end
+
+endmodule  // tb_application_fpga_sim
+
+//======================================================================
+// EOF tb_application_fpga_sim.v
+//======================================================================