?? music_police_siren.v
字號:
// music_police_siren.v //警笛鳴聲
module music_police_siren(clk, speaker);
input clk;
output speaker;
//
reg [22:0] tone;
always @(posedge clk) tone <= tone+1;
/*
This way, "clkdivider" have a value ranging from 15'b010000000000000
to 15'b011111111000000, or in hex 15'h2000 to 15'h3FC0, or in decimal
8192 to 16320. With a 25MHz input clock, that produces "speaker" from 765Hz to 1525Hz.
That gives us a high pitch siren.
*/
wire [6:0] ramp = (tone[22] ? tone[21:15] : ~tone[21:15]); //25000000/16320=1532HZ /2=765
//25000000/8192=1525*2(1525HZ)
wire [14:0] clkdivider = {2'b01, ramp, 6'b000000};
reg [14:0] counter;
always @(posedge clk) if(counter==0) counter <= clkdivider; else counter <= counter-1;
reg speaker;
always @(posedge clk) if(counter==0) speaker <= ~speaker;
endmodule
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