独立按键消抖

[其他]代码库

//****************************************//
// 作    者:绯红姜梦     
// 日    期:2022、6、1      
// QQ      :2943115420        
// QQ交流群:689408654        
// 功    能:按键消抖     

// author  :crimson ginger dream
// date    :2022/6/1
// QQ      :2943115420
// QQ group:689408654
// function:press to deshake
//****************************************//
module shake(		
	input      clk   ,		  
	input      rstn  ,    
	input      key   ,      
	output reg shape   
);
//parameter delay=45;         //仿真使用
parameter delay=999999;     //下开发板使用
reg [19:0]t20ms;
reg [ 1:0]key_d;
reg [ 1:0]state;

always@(posedge clk)
	key_d <= {key_d[0],key};
always@(posedge clk or negedge rstn)
	begin
		if(!rstn)begin
			shape <= 0;
			t20ms <= 0;
			state <= 0;
		end else case(state)
			0:begin
				if(key_d==2)begin
					state <= 1;
					shape <= 0;
					t20ms <= 0;
				end else begin
					shape <= 0;
					t20ms <= 0;
					state <= 0;
				end 
			end
			1:begin
				if(t20ms >= delay)begin
					shape <= 0;
					t20ms <= 0;
					state <= 2;
				end else begin
					shape <= 0;
					t20ms <= t20ms+1;
					state <= 1;
				end
			end
			2:begin 
				if(key_d==1)begin
					shape <= 0;
					t20ms <= 0;
					state <= 3;
				end else begin
					shape <= 0;
					t20ms <= 0;
					state <= 2;
				end
			end
			3:begin
				if(t20ms >= delay)begin
					shape <= 1;
					t20ms <= 0;
					state <= 0;
				end else begin
					shape <= 0;
					t20ms <= t20ms+1;
					state <= 3;
				end
			end
			default:begin
				shape <= 0;
				t20ms <= 0;
				state <= 0;
			end
		endcase
	end
	
endmodule