硬件电路图如下:
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module key
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(
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clk, //50MHZ
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reset,
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row, //行
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col, //列
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key_value //键值
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);
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input clk,reset;
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input [3:0] row;
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output [3:0] col;
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output [3:0] key_value;
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reg [3:0] col;
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reg [3:0] key_value;
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reg [5:0] count;//delay_20ms
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reg [2:0] state; //状态标志
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reg key_flag; //按键标志位
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reg clk_500khz; //500KHZ时钟信号
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reg [3:0] col_reg; //寄存扫描列值
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reg [3:0] row_reg; //寄存扫描行值
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always @(posedge clk or negedge reset)
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if(!reset) begin clk_500khz<=0; count<=0; end
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else
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begin
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if(count>=50) begin clk_500khz<=~clk_500khz;count<=0;end
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else count<=count+1;
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end
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always @(posedge clk_500khz or negedge reset)
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if(!reset) begin col<=4'b0000;state<=0;end
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else
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begin
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case (state)
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0:
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begin
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col[3:0]<=4'b0000;
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key_flag<=1'b0;
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if(row[3:0]!=4'b1111) begin state<=1;col[3:0]<=4'b1110;end //有键按下,扫描第一行
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else state<=0;
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end
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begin
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if(row[3:0]!=4'b1111) begin state<=5;end //判断是否是第一行
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else begin state<=2;col[3:0]<=4'b1101;end //扫描第二行
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end
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2:
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begin
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if(row[3:0]!=4'b1111) begin state<=5;end //判断是否是第二行
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else begin state<=3;col[3:0]<=4'b1011;end //扫描第三行
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end
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begin
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if(row[3:0]!=4'b1111) begin state<=5;end //判断是否是第三一行
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else begin state<=4;col[3:0]<=4'b0111;end //扫描第四行
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end
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4:
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begin
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if(row[3:0]!=4'b1111) begin state<=5;end //判断是否是第一行
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else state<=0;
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end
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5:
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begin
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if(row[3:0]!=4'b1111)
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begin
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col_reg<=col; //保存扫描列值
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row_reg<=row; //保存扫描行值
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state<=5;
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key_flag<=1'b1; //有键按下
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end
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else
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begin state<=0;end
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end
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endcase
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end
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always @(clk_500khz or col_reg or row_reg)
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begin
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if(key_flag==1'b1)
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begin
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case ({col_reg,row_reg})
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8'b1110_1110:key_value<=0;
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8'b1110_1101:key_value<=1;
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8'b1110_1011:key_value<=2;
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8'b1110_0111:key_value<=3;
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8'b1101_1110:key_value<=4;
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8'b1101_1101:key_value<=5;
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8'b1101_1011:key_value<=6;
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8'b1101_0111:key_value<=7;
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8'b1011_1110:key_value<=8;
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8'b1011_1101:key_value<=9;
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8'b1011_1011:key_value<=10;
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8'b1011_0111:key_value<=11;
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8'b0111_1110:key_value<=12;
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8'b0111_1101:key_value<=13;
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8'b0111_1011:key_value<=14;
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8'b0111_0111:key_value<=15;
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endcase
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end
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end
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endmodule
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