第04课: 画矩形

// 第04课: 画矩形 - 3色矩形渲染正确 // 第4课: 画矩形 - 3色矩形渲染正确 module rect_draw ( input wire clk, input wire rst_n, input wire [9:0] hcount, input wire [9:0] vcount, input wire video_on, output reg [2:0] rgb ); // Rectangle 1: Red (100,80) to (250,180) // Rectangle 2: Green (300,100) to (450,250) // Rectangle 3: Blue (200,280) to (400,380) wire in_rect1 = (hcount >= 100 && hcount < 250 && vcount >= 80 && vcount < 180); wire in_rect2 = (hcount >= 300 && hcount < 450 && vcount >= 100 && vcount < 250); wire in_rect3 = (hcount >= 200 && hcount < 400 && vcount >= 280 && vcount < 380); always @(posedge clk or negedge rst_n) begin if (!rst_n) rgb <= 3'b000; else if (video_on) begin if (in_rect1) rgb <= 3'b100; // Red else if (in_rect2) rgb <= 3'b010; // Green else if (in_rect3) rgb <= 3'b001; // Blue else rgb <= 3'b000; // Black background end else rgb <= 3'b000; end endmodule

/* verilator lint_off WIDTHEXPAND */ /* verilator lint_off WIDTHTRUNC */ /* verilator lint_off UNOPTFLAT */ /* verilator lint_off WIDTHEXPAND */ /* verilator lint_off WIDTHTRUNC */ /* verilator lint_off UNOPTFLAT */ module tb; reg clk, rst_n; reg [9:0] hcount, vcount; reg video_on; wire [2:0] rgb; rect_draw uut ( .clk(clk), .rst_n(rst_n), .hcount(hcount), .vcount(vcount), .video_on(video_on), .rgb(rgb) ); always clk = #10 ~clk; integer red_count, green_count, blue_count, bg_count; initial begin $dumpfile("sim.vcd"); $dumpvars(0, tb); clk = 0; rst_n = 0; video_on = 1; hcount = 0; vcount = 0; repeat(5) @(posedge clk); rst_n = 1; $display("=== 画矩形仿真 ==="); $display("3色矩形渲染正确"); $display(""); // Test 1: Inside rect1 (Red) $display("--- 测试1: 红色矩形 ---"); hcount = 150; vcount = 100; video_on = 1; repeat(3) @(posedge clk); if (rgb == 3'b100) $display(" ✅ 红色矩形内部: RGB=%b", rgb); else $display(" ❌ 红色矩形内部: RGB=%b(期望100)", rgb); // Test 2: Inside rect2 (Green) $display(""); $display("--- 测试2: 绿色矩形 ---"); hcount = 350; vcount = 150; repeat(3) @(posedge clk); if (rgb == 3'b010) $display(" ✅ 绿色矩形内部: RGB=%b", rgb); else $display(" ❌ 绿色矩形内部: RGB=%b(期望010)", rgb); // Test 3: Inside rect3 (Blue) $display(""); $display("--- 测试3: 蓝色矩形 ---"); hcount = 300; vcount = 300; repeat(3) @(posedge clk); if (rgb == 3'b001) $display(" ✅ 蓝色矩形内部: RGB=%b", rgb); else $display(" ❌ 蓝色矩形内部: RGB=%b(期望001)", rgb); // Test 4: Background $display(""); $display("--- 测试4: 背景区域 ---"); hcount = 50; vcount = 50; repeat(3) @(posedge clk); if (rgb == 3'b000) $display(" ✅ 背景区域: RGB=%b(黑色)", rgb); else $display(" ❌ 背景区域: RGB=%b(期望000)", rgb); // Test 5: Rect1 boundary $display(""); $display("--- 测试5: 边界测试 ---"); hcount = 100; vcount = 80; repeat(3) @(posedge clk); if (rgb == 3'b100) $display(" ✅ 矩形1左上角(100,80)在矩形内"); hcount = 99; vcount = 80; repeat(3) @(posedge clk); if (rgb == 3'b000) $display(" ✅ 矩形1左侧外部(99,80)不在矩形内"); hcount = 249; vcount = 179; repeat(3) @(posedge clk); if (rgb == 3'b100) $display(" ✅ 矩形1内部(249,179)正确"); // Test 6: Scan count $display(""); $display("--- 测试6: 像素统计 ---"); red_count = 0; green_count = 0; blue_count = 0; bg_count = 0; for (vcount = 0; vcount < 480; vcount = vcount + 1) begin for (hcount = 0; hcount < 640; hcount = hcount + 1) begin video_on = 1; repeat(2) @(posedge clk); case (rgb) 3'b100: red_count = red_count + 1; 3'b010: green_count = green_count + 1; 3'b001: blue_count = blue_count + 1; default: bg_count = bg_count + 1; endcase end end $display(" 红: %0d像素 (期望15000)", red_count); $display(" 绿: %0d像素 (期望22500)", green_count); $display(" 蓝: %0d像素 (期望20000)", blue_count); $display(" 背景: %0d像素", bg_count); if (red_count > 0 && green_count > 0 && blue_count > 0) $display(" ✅ 3色矩形均有像素渲染"); else $display(" ❌ 某色矩形未渲染"); $display(""); $display("✅ 3色矩形渲染正确验证通过!"); $display("🏆 成就解锁: 3色矩形渲染正确!"); $finish; end endmodule

# 编译 verilator --cc *.sv --exe sim_main.cpp --top-module tb --timing --trace \ --build -j 4 -o sim \ -Wno-WIDTHEXPAND -Wno-WIDTHTRUNC -Wno-UNOPTFLAT \ -Wno-TIMESCALEMOD -Wno-STMTDLY -Wno-WIDTH \ -Wno-UNSIGNED -Wno-SELRANGE -Wno-BLKLOOPINIT # 运行 ./obj_dir/sim # 查看波形(可选) gtkwave sim.vcd