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859天前//****************************************// |
// 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 |
