第17课: MIDI播放

// 第17课: MIDI播放 module midi_player ( input wire clk, input wire rst_n, input wire play, output reg [7:0] note, output reg note_on, output reg note_off, output reg [7:0] velocity, output reg [6:0] tempo, output reg playing ); reg [15:0] note_freq [0:11]; initial begin note_freq[0]=262;note_freq[1]=277;note_freq[2]=294;note_freq[3]=311;note_freq[4]=330;note_freq[5]=349;note_freq[6]=370;note_freq[7]=392;note_freq[8]=415;note_freq[9]=440;note_freq[10]=466;note_freq[11]=494; end reg [15:0] seq_rom [0:31]; integer i; initial begin seq_rom[0]={8'd60,8'd8};seq_rom[1]={8'd60,8'd8};seq_rom[2]={8'd67,8'd8};seq_rom[3]={8'd67,8'd8}; seq_rom[4]={8'd69,8'd8};seq_rom[5]={8'd69,8'd8};seq_rom[6]={8'd67,8'd16};seq_rom[7]={8'd65,8'd8}; seq_rom[8]={8'd65,8'd8};seq_rom[9]={8'd64,8'd8};seq_rom[10]={8'd64,8'd8};seq_rom[11]={8'd62,8'd8}; seq_rom[12]={8'd62,8'd8};seq_rom[13]={8'd60,8'd16}; for(i=14;i<32;i=i+1) seq_rom[i]=16'h0000; end reg [4:0] seq_idx; reg [7:0] duration_cnt, cur_duration; always @(posedge clk or negedge rst_n) begin if(!rst_n) begin note<=0;note_on<=0;note_off<=0;velocity<=0;tempo<=60;playing<=0;seq_idx<=0;duration_cnt<=0;cur_duration<=0; end else begin note_on<=0;note_off<=0; if(play&&!playing) begin playing<=1;seq_idx<=0;duration_cnt<=0; end if(playing) begin if(duration_cnt==0) begin note<=seq_rom[seq_idx][15:8];cur_duration<=seq_rom[seq_idx][7:0];velocity<=100;note_on<=1;duration_cnt<=1; end else if(duration_cnt>=cur_duration) begin note_off<=1;duration_cnt<=0;seq_idx<=seq_idx+1; if(seq_idx>=13||seq_rom[seq_idx+1]==16'h0000) playing<=0; end else duration_cnt<=duration_cnt+1; end end end endmodule

/* verilator lint_off WIDTHEXPAND */ /* verilator lint_off WIDTHTRUNC */ /* verilator lint_off UNOPTFLAT */ module tb; reg clk,rst_n,play; wire [7:0] note,velocity; wire note_on,note_off; wire [6:0] tempo; wire playing; midi_player uut (.clk(clk),.rst_n(rst_n),.play(play),.note(note),.note_on(note_on),.note_off(note_off),.velocity(velocity),.tempo(tempo),.playing(playing)); always clk = #10 ~clk; integer note_count; reg [7:0] played_notes [0:15]; initial begin $dumpfile("midi.vcd");$dumpvars(0,tb);clk=0;rst_n=0;play=0;note_count=0; repeat(5)@(posedge clk);rst_n=1; $display("=== MIDI播放仿真 ===");$display("播放MIDI文件音符序列");$display("曲目: 小星星(Twinkle Twinkle Little Star)");$display(""); $display("--- MIDI消息格式 ---");$display(" Note On: 0x9n note velocity");$display(" Note Off: 0x8n note velocity");$display(" Tempo: 0xFF 0x51 0x03 tt tt tt");$display(""); $display("--- 开始播放 ---");play=1;@(posedge clk);play=0; while(playing&&note_count<15) begin @(posedge clk); if(note_on) begin played_notes[note_count]=note;$display(" 🎵 Note On: MIDI#%0d (时值=%0d)",note,uut.cur_duration);note_count=note_count+1;end if(note_off) $display(" 🎵 Note Off: MIDI#%0d",note); end repeat(50)@(posedge clk); $display("");$display("--- 播放统计 ---");$display(" 总音符数: %0d",note_count); $display(" 播放音符序列:"); begin integer j;$write(" ");for(j=0;j<note_count;j=j+1) begin case(played_notes[j]%12) 0:$write("C4 ");1:$write("C#4 ");2:$write("D4 ");3:$write("D#4 ");4:$write("E4 ");5:$write("F4 ");6:$write("F#4 ");7:$write("G4 ");8:$write("G#4 ");9:$write("A4 ");10:$write("A#4 ");11:$write("B4 ");default:$write("? ");endcase end end $display(""); if(note_count>=13) begin $display(" ✅ 播放了完整的音符序列"); if(played_notes[0]==60&&played_notes[2]==67&&played_notes[4]==69) $display(" ✅ 小星星旋律正确: C C G G A A..."); end $display("");$display("✅ 播放MIDI文件音符序列验证通过!");$display("🏆 成就解锁: 播放MIDI文件音符序列!");$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-BLKSEQ # 运行 ./obj_dir/sim # 查看波形(可选) gtkwave sim.vcd