module song
(clk,beep)
;//模組名稱song
input clk;
//系統時鐘50mhz
output beep;
//蜂鳴器輸出端
reg beep_r;
//暫存器
reg[7:
0] state;
//樂譜狀態機
reg[16:
0]count,count_end;
reg[23:
0]count1;
//樂譜引數:d=f/2k (d:引數,f:時鐘頻率,k:音高頻率)
parameter l_3 =
17'd75850,
//低音3
l_5 =
17'd63776,
//低音5
l_6 =
17'd56818,
//低音6
l_7 =
17'd50618,
//低音7
m_1 =
17'd47774,
//中音1
m_2 =
17'd42568,
//中音2
m_3 =
17'd37919,
//中音3
m_5 =
17'd31888,
//中音5
m_6 =
17'd28409,
//中音6
h_1 =
17'd23889;
//高音1
parameter time =
12000000
;//控制每乙個音的長短(250ms)
assign beep = beep_r;
//輸出**
always@(posedge clk) begin
count <= count +
1'b1;
//計數器加1
if(count == count_end) begin
count <=
17'h0;
//計數器清零
beep_r <=
!beep_r;
//輸出取反
endend//曲譜 產生分頻的係數並描述出曲譜
always @(posedge clk) begin
if(count1 < time)
//乙個節拍250ms
count1 = count1 +
1'b1;
else begin
count1 =
24'd0;
if(state ==
8'd63)
state =
8'd0;
else
state = state +
1'b1;
case
(state)
8'd0:count_end = l_6;
8'd1:count_end=m_1;
8'd2:count_end=m_3;
8'd3:count_end=m_5;
8'd4,8'd5:count_end=m_3;
8'd6:count_end=m_3;
8'd7:count_end=m_2;
8'd8,8'd9:count_end=m_3;
8'd10:count_end=m_3;
8'd11:count_end=m_2;
8'd12,8'd13:count_end=m_3;
8'd14:count_end=l_6;
8'd15:count_end=l_7;
8'd16:count_end=m_1;
8'd17:count_end=m_3;
8'd18:count_end=m_2;
8'd19:count_end=m_1;
8'd20,8'd21:count_end=l_6;
8'd22,8'd23:count_end=l_5;
8'd24,8'd25,
8'd26,8'd27,
8'd28,8'd29,
8'd30,8'd31:count_end=l_3;
8'd32:count_end = l_6;
8'd33:count_end=m_1;
8'd34:count_end=m_3;
8'd35:count_end=m_5;
8'd36,8'd37:count_end=m_3;
8'd38:count_end=m_3;
8'd39:count_end=m_2;
8'd40,8'd41:count_end=m_3;
8'd42:count_end=m_3;
8'd43:count_end=m_2;
8'd44,8'd45:count_end=m_3;
8'd46:count_end=l_6;
8'd47:count_end=l_7;
8'd48:count_end=m_1;
8'd49:count_end=m_3;
8'd50:count_end=m_2;
8'd51:count_end=m_1;
8'd52,8'd53:count_end=l_6;
8'd54,8'd55:count_end=l_5;
8'd56,8'd57,
8'd58,8'd59,
8'd60,8'd61:count_end=l_6;
8'd62:count_end=l_6;
8'd63:count_end=l_7;
default
: count_end =
16'h0;
endcase
endendendmodule
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