module song(clk,key,song_out,led);
input [7:0] key;
input clk;
output song_out;
output [7:0] led;
reg song_reg;
reg [21:0] count;
reg [19:0] delay;
reg [7:0] key_reg;
always @(posedge clk)
begin
count=count+1;
if((count==delay)&(!(delay==20'd65535)))
begin
count=22'd0;
song_reg=!song_reg;
end
end
always @(key)
begin
key_reg=key;
case(key_reg)
8'b0000_0001: delay=20'd47774; //zhong yin 1 523.3HZ
8'b0000_0010: delay=20'd42568; //zhong yin 2 587.3HZ
8'b0000_0100: delay=20'd37919; //zhong yin 3 659.3HZ
8'b0000_1000: delay=20'd35791; //zhong yin 4 698.5HZ
8'b0001_0000: delay=20'd31888; //zhong yin 5 784HZ
8'b0010_0000: delay=20'd28409; //zhong yin 6 880HZ
8'b0100_0000: delay=20'd25309; //zhong yin 7 987.8HZ
8'b1000_0000: delay=20'd23889; //gao yin 1 1046.5HZ
default: delay=20'd65535;
endcase
end
assign song_out=song_reg;
|
文件: |
song.rar |
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assign led=key_reg;
endmodule
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