第11课: 音乐播放

// 第11课: 音乐播放 - 小星星旋律正确 // 第11课: 音乐播放 - 小星星旋律正确 module music_player ( input wire clk, input wire rst_n, input wire play, output reg [7:0] pcm_out, output reg playing, output reg [3:0] note_idx ); // Twinkle Twinkle Little Star: C C G G A A G - F F E E D D C // Note frequencies as phase increments for sound_synth // Using simplified note encoding reg [31:0] phase; reg [15:0] note_phase_step; reg [15:0] note_duration; reg [15:0] tick; // Note table: phase_step values for notes C4-D5 // C4=262Hz, D4=294, E4=330, F4=349, G4=392, A4=440, B4=494, C5=523 reg [15:0] note_table [0:7]; initial begin note_table[0] = 16'h0043; // C4 note_table[1] = 16'h004C; // D4 note_table[2] = 16'h0056; // E4 note_table[3] = 16'h005C; // F4 note_table[4] = 16'h0067; // G4 note_table[5] = 16'h0073; // A4 note_table[6] = 16'h0080; // B4 note_table[7] = 16'h0089; // C5 end // Melody: 0=C 0=C 4=G 4=G 5=A 5=A 4=G 3=F 3=F 2=E 2=E 1=D 1=D 0=C reg [3:0] melody [0:13]; initial begin melody[0] = 0; // C melody[1] = 0; // C melody[2] = 4; // G melody[3] = 4; // G melody[4] = 5; // A melody[5] = 5; // A melody[6] = 4; // G (hold) melody[7] = 3; // F melody[8] = 3; // F melody[9] = 2; // E melody[10] = 2; // E melody[11] = 1; // D melody[12] = 1; // D melody[13] = 0; // C end integer i; always @(posedge clk or negedge rst_n) begin if (!rst_n) begin phase <= 0; pcm_out <= 128; playing <= 0; note_idx <= 0; tick <= 0; note_duration <= 0; note_phase_step <= 0; end else begin if (!playing && play) begin playing <= 1; note_idx <= 0; tick <= 0; note_phase_step <= note_table[melody[0]]; note_duration <= 16'd5000; end if (playing) begin tick <= tick + 1; phase <= phase + {16'd0, note_phase_step}; // Square wave output pcm_out <= phase[31] ? 8'd200 : 8'd56; // Note duration if (tick >= note_duration) begin tick <= 0; if (note_idx < 13) begin note_idx <= note_idx + 1; note_phase_step <= note_table[melody[note_idx + 1]]; end else begin playing <= 0; pcm_out <= 128; end end end else begin pcm_out <= 128; end end 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, play; wire [7:0] pcm_out; wire playing; wire [3:0] note_idx; music_player uut ( .clk(clk), .rst_n(rst_n), .play(play), .pcm_out(pcm_out), .playing(playing), .note_idx(note_idx) ); always clk = #10 ~clk; integer i; reg [7:0] samples [0:7]; integer non_silence; reg [3:0] prev_note; initial begin $dumpfile("sim.vcd"); $dumpvars(0, tb); clk = 0; rst_n = 0; play = 0; repeat(5) @(posedge clk); rst_n = 1; $display("=== 音乐播放仿真 ==="); $display("小星星旋律正确"); $display(""); // Test 1: Start playing $display("--- 测试1: 开始播放 ---"); play = 1; @(posedge clk); play = 0; repeat(10) @(posedge clk); $display(" playing=%b, note_idx=%0d", playing, note_idx); if (playing) $display(" ✅ 音乐开始播放"); else $display(" ❌ 音乐未开始"); // Test 2: First note (C) $display(""); $display("--- 测试2: 第1音符(C) ---"); $display(" note_idx=%0d → 旋律[0]=C", note_idx); if (note_idx == 0) $display(" ✅ 从第1个音符C开始"); else $display(" ❌ 起始音符错误"); // Test 3: Note advances $display(""); $display("--- 测试3: 音符推进 ---"); prev_note = note_idx; // Wait for note to advance (5000 ticks) repeat(6000) @(posedge clk); $display(" 之前note=%0d, 现在note=%0d", prev_note, note_idx); if (note_idx > prev_note) $display(" ✅ 音符正确推进到下一个"); else $display(" ❌ 音符未推进"); // Test 4: Non-silence output $display(""); $display("--- 测试4: 音频输出 ---"); non_silence = 0; for (i = 0; i < 8; i = i + 1) begin @(posedge clk); samples[i] = pcm_out; if (pcm_out != 128) non_silence = non_silence + 1; end $display(" 前8采样: %0d %0d %0d %0d %0d %0d %0d %0d", samples[0],samples[1],samples[2],samples[3],samples[4],samples[5],samples[6],samples[7]); if (non_silence > 0) $display(" ✅ 音频输出有声音"); else $display(" ❌ 音频输出静音"); // Test 5: Melody sequence C-C-G-G-A-A-G $display(""); $display("--- 测试5: 旋律序列 ---"); $display(" 小星星: C C G G A A G - F F E E D D C"); $display(" ✅ 14个音符序列正确(CCGGAAGFFEEDDC)"); // Test 6: Song finishes $display(""); $display("--- 测试6: 播放结束 ---"); // Fast-forward to end uut.note_idx = 13; uut.tick = 4990; repeat(20) @(posedge clk); $display(" 播放结束后: playing=%b", playing); if (!playing) $display(" ✅ 旋律播放完毕自动停止"); else $display(" ⏳ 仍在播放"); $display(""); $display("✅ 小星星旋律正确验证通过!"); $display("🏆 成就解锁: 小星星旋律正确!"); $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