25M时钟的梁祝演奏

module liangzhu(clk_50M,rst,speaker);
input clk_50M,rst;
output speaker;
reg speaker;

//分频计数器
parameter wide=15;
reg[7:0] cnt; //音名数
reg[3:0] cnt1; //5MHz基频
reg[23:0] cnt2;//节拍频率5Hz
reg[wide-1:0] origin;//预置数寄存器
reg[wide-1:0] drive;
reg[1:0] count;
reg carrier;
//分频产生5MHz和5Hz的频率
always @(posedge clk_50M,negedge rst)
begin
if(!rst)
begin
cnt1<=4'd0;
cnt2<=24'd0;
end
else
begin
cnt1<=cnt1+1'b1;
cnt2<=cnt2+1'b1;
if(cnt1==4'd4)
cnt1<=4'd0;
if(cnt2==4999999)
cnt2<=24'd0;
end
end
always @(posedge clk_50M,negedge rst)
begin
if(!rst)
drive<=15'h0;
else if(cnt1==4'd4)
begin
if(drive==15'h3fff)
begin
drive<=origin;
carrier<=1'b1;
end
else begin drive<=drive+1'b1;carrier<=1'b0; end
end
end

//carrier的频率是每个音阶的频率  音乐里面的节拍

always @(posedge carrier)
begin
count<=count+1'b1;
if(count==4'd0)
speaker<=1'b1;
else speaker<=1'b0;

end
always @(posedge clk_50M,negedge rst)
begin
if(!rst)
begin
origin<=15'h0;
cnt<=8'd0;
end
else if(cnt2==24'h98967F/2)
begin
if(cnt==8'd139)
cnt<=8'd0;
else
cnt<=cnt+1'b1;

case (cnt)
8'd0:origin<=15'h625F/2; //中音3，4个节拍
8'd1:origin<=15'h625F/2;
8'd2:origin<=15'h625F/2;
8'd3:origin<=15'h625F/2;
8'd4:origin<=15'h6715/2; //中音5,3个节拍
8'd5:origin<=15'h6715/2;
8'd6:origin<=15'h6715/2;
8'd7:origin<=15'h69cd/2;//中音6
8'd8:origin<=15'h6d55/2; //高音1，3个节拍
8'd9:origin<=15'h6d55/2;
8'd10:origin<=15'h6d55/2;

8'd11:origin<=15'h6f5f/2; //高音2
8'd12:origin<=15'h69cd/2; //中音6
8'd13:origin<=15'h6d55/2; //高音1
8'd14:origin<=15'h6715/2; //中音5
8'd15:origin<=15'h6715/2;
8'd16:origin<=15'h738a/2; //高音5
8'd17:origin<=15'h738a/2;
8'd18:origin<=15'h738a/2;
8'd19:origin<=15'h76aa/2; //倍高音1
8'd20:origin<=15'h69cd/2; //高音6

8'd21:origin<=15'h6715/2;//高音5
8'd22:origin<=15'h712f/2;//高音3
8'd23:origin<=15'h6715/2;//高音5
8'd24:origin<=15'h6f5f/2; //高音2
8'd25:origin<=15'h6f5f/2;
8'd26:origin<=15'h6f5f/2;
8'd27:origin<=15'h6f5f/2;
8'd28:origin<=15'h6f5f/2;
8'd29:origin<=15'h6f5f/2;
8'd30:origin<=15'h6f5f/2;
8'd31:origin<=15'h6f5f/2;
8'd32:origin<=15'h6f5f/2;
8'd33:origin<=15'h6f5f/2;
8'd34:origin<=15'h6f5f/2;
8'd35:origin<=15'h712f/2;//高音3
8'd36:origin<=15'h6c39/2; //中音7
8'd37:origin<=15'h6c39/2;
8'd38:origin<=15'h69cd/2;//中音6
8'd39:origin<=15'h69cd/2;
8'd40:origin<=15'h6715/2; //中音5
8'd41:origin<=15'h6715/2;
8'd42:origin<=15'h6715/2;
8'd43:origin<=15'h69cd/2;//中音6
8'd44:origin<=15'h6d55/2;//高音1

8'd45:origin<=15'h6d55;
8'd46:origin<=15'h6f5f/2;//高音2
8'd47:origin<=15'h6f5f/2;
8'd48:origin<=15'h625f/2;//中音3
8'd49:origin<=15'h625f/2;
8'd50:origin<=15'h6d55/2; //高音1
8'd51:origin<=15'h6d55/2;

8'd52:origin<=15'h69cd/2;//中音6
8'd53:origin<=15'h6715/2;//中音5
8'd54:origin<=15'h69cd/2; //中音6
8'd55:origin<=15'h6d55/2;//高音1
8'd56:origin<=15'h6715/2;//中音5
8'd57:origin<=15'h6715/2;
8'd58:origin<=15'h6715/2;
8'd59:origin<=15'h6715/2;
8'd60:origin<=15'h6715/2;
8'd61:origin<=15'h6715/2;
8'd62:origin<=15'h6715/2;
8'd63:origin<=15'h6715/2;
8'd64:origin<=15'h712f/2;//高音3
8'd65:origin<=15'h712f/2;
8'd66:origin<=15'h712f/2;
8'd67:origin<=15'h738a/2;//高音5
8'd68:origin<=15'h6c39/2;//中音7
8'd69:origin<=15'h6c39/2;
8'd70:origin<=15'h6f5f/2;//高音2
8'd71:origin<=15'h6f5f/2;

8'd72:origin<=15'h69cd/2; //中音6
8'd73:origin<=15'h6d55/2;//高音1
8'd74:origin<=15'h6715/2;//中音5
8'd75:origin<=15'h6715/2;
8'd76:origin<=15'h6715/2;
8'd77:origin<=15'h6715/2;
8'd78:origin<=15'h6715/2;

8'd79:origin<=15'h6715;
8'd80:origin<=15'h625f/2; //中音3

8'd81:origin<=15'h6715/2;//中音5
8'd82:origin<=15'h625f/2;//中音3
8'd83:origin<=15'h625f/2;
8'd84:origin<=15'h6715/2;//中音5
8'd85:origin<=15'h69cd/2;//中音6
8'd86:origin<=15'h6c39/2;//中音7
8'd87:origin<=15'h6f5f/2;//高音2
8'd88:origin<=15'h69cd/2;//中音6
8'd89:origin<=15'h69cd/2;
8'd90:origin<=15'h69cd/2;
8'd91:origin<=15'h69cd/2;
8'd92:origin<=15'h69cd/2;
8'd93:origin<=15'h69cd/2;
8'd94:origin<=15'h6715/2;//中音5
8'd95:origin<=15'h69cd/2;//中音6
8'd96:origin<=15'h6d55/2;//高音1
8'd97:origin<=15'h6d55/2;
8'd98:origin<=15'h6d55/2;
8'd99:origin<=15'h6f5f/2;////高音2
8'd100:origin<=15'h738a/2; //高音5
8'd101:origin<=15'h738a/2;
8'd102:origin<=15'h738a/2;
8'd103:origin<=15'h712f/2;//高音3
8'd104:origin<=15'h6f5f/2;//高音2
8'd105:origin<=15'h6f5f/2;
8'd106:origin<=15'h712f/2;//高音3
8'd107:origin<=15'h6f5f/2;//高音2
8'd108:origin<=15'h6d55/2;//高音1
8'd109:origin<=15'h6d55/2;
8'd110:origin<=15'h69cd/2;//中音6

8'd111:origin<=15'h6715/2;//中音5
8'd112:origin<=15'h625f/2;//中音3

8'd113:origin<=15'h625f;
8'd114:origin<=15'h625f/2;
8'd115:origin<=15'h625f/2;
8'd116:origin<=15'h6d55/2;//高音1
8'd117:origin<=15'h6d55/2;
8'd118:origin<=15'h69cd/2;//中音6
8'd119:origin<=15'h6d55/2;//高音1
8'd120:origin<=15'h69cd/2;//中音6

8'd121:origin<=15'h625f/2;//中音3
8'd122:origin<=15'h625f/2;
8'd123:origin<=15'h6f5f/2;//高音2
8'd124:origin<=15'h625f/2;//中音3
8'd125:origin<=15'h6715/2;//中音5
8'd126:origin<=15'h69cd/2;//中音6
8'd127:origin<=15'h6d55/2;//高音1
8'd128:origin<=15'h6715/2;//中音5
8'd129:origin<=15'h6715/2;
8'd130:origin<=15'h6715/2;
8'd131:origin<=15'h6715/2;
8'd132:origin<=15'h6715/2;
8'd133:origin<=15'h6715/2;
8'd134:origin<=15'h6715/2;
8'd135:origin<=15'h6715/2;
8'd136:origin<=15'h3fff/2;
8'd137:origin<=15'h3fff/2;
8'd138:origin<=15'h3fff/2;
8'd139:origin<=15'h3fff/2;
default:origin<=15'h3fff/2;
endcase
end
end
endmodule