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Verilog 简单的延时实现矩阵键盘消抖，有需要可以看看

2015-10-21 16:03:36 7310 键盘

0 always@(posedge clk or negedge rst) begin if(!rst) begin scan_key<=0; end else begin case(row) //该case结果检测何处有键按下 4'b1110: case(column) 4'b1110: begin cnt <= cnt + 1'b1; if((cnt == 20'hfffff) & (column == 4'b1110)) begin cnt <= 1'b0; scan_key<=0; end end 4'b1101: begin cnt <= cnt + 1'b1; if((cnt == 20'hfffff) & (column == 4'b1101)) begin cnt <= 1'b0; scan_key<=1; end end 4'b1011: begin cnt <= cnt + 1'b1; if((cnt == 20'hfffff) & (column == 4'b1011)) begin cnt <= 1'b0; scan_key<=2; end end 4'b0111: begin cnt <= cnt + 1'b1; if((cnt == 20'hfffff) & (column == 4'b0111)) begin cnt <= 1'b0; scan_key<=3; end end endcase 4'b1101: case(column) 4'b1110: begin cnt <= cnt + 1'b1; if((cnt == 20'hfffff) & (column == 4'b1110)) begin cnt <= 1'b0; scan_key<=4; end end 4'b1101: begin cnt <= cnt + 1'b1; if((cnt == 20'hfffff) & (column == 4'b1101)) begin cnt <= 1'b0; scan_key<=5; end end 4'b1011: begin cnt <= cnt + 1'b1; if((cnt == 20'hfffff) & (column == 4'b1011)) begin cnt <= 1'b0; scan_key<=6; end end 4'b0111: begin cnt <= cnt + 1'b1; if((cnt == 20'hfffff) & (column == 4'b0111)) begin cnt <= 1'b0; scan_key<=7; end end endcase 4'b1011: case(column) 4'b1110: begin cnt <= cnt + 1'b1; if((cnt == 20'hfffff) & (column == 4'b1110)) begin cnt <= 1'b0; scan_key<=8; end end 4'b1101: begin cnt <= cnt + 1'b1; if((cnt == 20'hfffff) & (column == 4'b1101)) begin cnt <= 1'b0; scan_key<=9; end end 4'b1011: begin cnt <= cnt + 1'b1; if((cnt == 20'hfffff) & (column == 4'b1011)) begin cnt <= 1'b0; scan_key<=10; end end 4'b0111: begin cnt <= cnt + 1'b1; if((cnt == 20'hfffff) & (column == 4'b0111)) begin cnt <= 1'b0; scan_key<=11; end end endcase 4'b0111: case(column) 4'b1110: begin cnt <= cnt + 1'b1; if((cnt == 20'hfffff) & (column == 4'b1110)) begin cnt <= 1'b0; scan_key<=12; end end 4'b1101: begin cnt <= cnt + 1'b1; if((cnt == 20'hfffff) & (column == 4'b1101)) begin cnt <= 1'b0; scan_key<=13; end end 4'b1011: begin cnt <= cnt + 1'b1; if((cnt == 20'hfffff) & (column == 4'b1011)) begin cnt <= 1'b0; scan_key<=14; end end 4'b0111: begin cnt <= cnt + 1'b1; if((cnt == 20'hfffff) & (column == 4'b0111)) begin cnt <= 1'b0; scan_key<=15; end end endcase default: scan_key<=15; endcase end end 4
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