矩阵键盘

//功能：按键代表0~9 10个数字，按下按键led显示按下数字的二进制码，同时数码管加上该数字
/*****************************************************************************/
/*--思路：让行分别为0111 1011 1101 1110 然后检测列的状态 如果列的状态为0111 1011 1101 1110
通过矩阵按键 来让led显示二进数字*/
//错误1 行输入不稳定 错的话经常显示第一行的数据，但是第一行数据稳定 解决：消抖
//错误2：按键按下的是上一个状态     解决：松手检测
//错误三：延时20ms计算错误
//通过20ms检测一次电平的方法消抖效果更好
//当第一个按键按下的时候 temp没有加数字 但是value已经发生变换了  数码管比按键落后一个状态
//    if(FLAG&&！STATE)//有键按下且完成消抖原来是这个鬼，如果是按键检测的话rcol，rROW的值还没有刷新
//错误四：第三四行，刷新数据满不如12行稳定 可能是时间比较长 将20ms消抖改成10ms消抖
module juzhenbutton
(
CLK,RSTn,ROW,COL,LED,SMG1,SMG2
);
input CLK;
input RSTn;
input [3:0]COL;
output[3:0]ROW;
output [9:0]LED;
output[6:0]SMG1;
output[6:0]SMG2;

/*************************/
reg[2:0]State;//多个状态
reg[3:0]ROW;//寄存器放行   四个寄存器
reg[9:0]Value;//储存按键码
reg FLAG;//如果FLAG为1的话表示按键按下
reg [3:0]rCOL;//储存列
reg [3:0]rROW;//储存行键值
reg CLK_10MS;
parameter _0=8'hc0,_1=8'hf9,_2=8'ha4,_3=8'hb0,_4=8'h99,
             _5=8'h92,_6=8'h82,_7=8'hf8,_8=8'h80,_9=8'h90;
/******************************************/
reg[19:0]Count;
parameter TIME_10MS=20'd499_999;
always@(posedge CLK or negedge RSTn)
if(!RSTn)
begin
    CLK_10MS<=1'b0;
    Count<=20'd0;
end
else 
    if(Count==TIME_10MS)
    begin
        CLK_10MS<=~CLK_10MS;
        Count<=20'd0;
    end
    else 
        Count<=Count+1'b1;
/**********************************/
//定时器20ms
/*
reg[19:0]Count1;
reg isCount;//是否开始计数
//parameter TIME_20MS=20'd999_999;
always@(posedge CLK or negedge RSTn)
if(!RSTn)
    Count1<=20'd0;
else if(Count1==TIME_20MS)
    Count1<=20'd0;
else if(isCount)
    Count1<=Count1+1'b1;
else if(!isCount)
    Count1<=20'b0;
/*********************************/
/*-----检测各行-----*/
always@(posedge CLK_10MS or negedge RSTn)
if(!RSTn)
begin
    State<=3'd0;
    ROW<=4'b0000;
    //isCount<=1'b0;
    rROW<=4'b1111;
    rCOL<=4'b1111;
end
else
    case(State)
        3'd0:
        begin
            FLAG<=1'b0;
            ROW<=4'b0000;
            if(COL!=4'b1111)//说明有键按下
            begin
                //if(Count==TIME_20MS)
                    //begin
                        FLAG<=1'b1;//有键按下
                        State<=3'd1;//检测第一行
                        ROW<=4'b1110;
                        //isCount<=1'b0;
                //    end
            //    else isCount<=1'b1;
            end
            else State<=3'd0;
        end
        3'd1:
        begin
            if(COL!=4'b1111&&ROW==4'b1110)//第一行有键按下
            begin
                State<=3'd5;
                //FLAG<=1'b1;
            //    rCOL<=COL;//锁存键值
            //    rROW<=ROW;
            end
            else 
            begin
                State<=3'd2;//检测第二行
                ROW<=4'b1101;
            end
        end
        3'd2:
        begin
            if(COL!=4'b1111&&ROW==4'b1101)//第二行有键按下
            begin
                State<=3'd5;
        //        FLAG<=1'b1;
                //rCOL<=COL;
                //rROW<=ROW;
            end
            else
            begin
                State<=3'd3;
                ROW<=4'b1011;
            end
        end
        3'd3:
        begin
            if(COL!=4'b1111&&ROW==4'b1011)//第三行有键按下
            begin
                State<=3'd5;
            //    FLAG<=1'b1;
                //rCOL<=COL;
                //rROW<=ROW;
            end
            else 
            begin 
                State<=3'd4;
                ROW<=4'b0111;
            end
        end    
        3'd4:
        begin
        if(COL!=4'b1111&&ROW==4'b0111)//第四行有键按下
            begin
                State<=3'd5;
                //FLAG<=1'b1;
            //rCOL<=COL;
            //    rROW<=ROW;
            end
            else State<=3'd0;
        end
        3'd5:    
            if(COL!=4'b1111)
            begin 
                rCOL<=COL;//锁存键值
                rROW<=ROW;
               FLAG<=1'b1;//有键按下
                State<=3'd5;//FLAG保持一个时钟/
            end
            else
            begin
                State<=3'd0;
                FLAG<=1'b0;
            end
    default:
            begin 
                FLAG<=1'b0;
                State<=1'b0;
            end
    endcase

reg[7:0] TEMP;//要计算到99
//reg[7:0]TEMP1;//储存TEMP
reg STATE;//flag的前一状态
always@(posedge CLK or  negedge RSTn)
    if(!RSTn)
    begin
        Value<=10'd0;
        TEMP<=7'd0;
    //    TEMP1<=7'd0;
        STATE<=1'b0;
    end
    else if(TEMP>=7'd100)//如果大于等于100清0
    TEMP<=7'd0;
    else 
    begin
        STATE<=FLAG;    //把flag的状态赋值给STATE 
        if(!FLAG&&STATE)//有键按下且完成消抖
        begin
                begin
                    //STATE_Value<=1'b1;
                    case({rCOL,rROW})
                        8'b11101110:begin Value<=4'd0; TEMP<=TEMP+1'b0; end
                        8'b11011110:begin Value<=4'd1; TEMP<=TEMP+1'b1; end
                        8'b10111110:begin Value<=4'd2; TEMP<=TEMP+2'd2; end
                        8'b01111110:begin Value<=4'd3; TEMP<=TEMP+2'd3; end
                        8'b11101101:begin Value<=4'd4; TEMP<=TEMP+3'd4; end
                        8'b11011101:begin Value<=4'd5; TEMP<=TEMP+3'd5; end
                        8'b10111101:begin Value<=4'd6; TEMP<=TEMP+3'd6; end
                        8'b01111101:begin Value<=4'd7; TEMP<=TEMP+3'd7; end
                        8'b11101011:begin Value<=4'd8; TEMP<=TEMP+4'd8; end
                        8'b11011011:begin Value<=4'd9; TEMP<=TEMP+4'd9; end
                        8'b10111011:begin Value<=4'd10;TEMP<=TEMP+4'd10;end
                        8'b01111011:begin Value<=4'd11;TEMP<=TEMP+4'd11;end
                        8'b11100111:begin Value<=4'd12;TEMP<=TEMP+4'd12;end
                        8'b11010111:begin Value<=4'd13;TEMP<=TEMP+4'd13;end
                        8'b10110111:begin Value<=4'd14;TEMP<=TEMP+4'd14;end
                        8'b01110111:begin Value<=4'd15;TEMP<=TEMP+4'd15;end
                        default:    begin Value<=4'd0;TEMP<=TEMP ;     end
                    endcase        
                    //TEMP1<=TEMP;
                end
        //else isCount<=1'b1;//开始计数
        end
    end



reg[7:0] rSMG1;
always@(posedge CLK or negedge RSTn)
if(!RSTn)
    rSMG1[7:0]<=8'hff;
else 
    case(TEMP%10)
        4'd0:rSMG1<=_0;
        4'd1:rSMG1<=_1;
        4'd2:rSMG1<=_2;
        4'd3:rSMG1<=_3;
        4'd4:rSMG1<=_4;
        4'd5:rSMG1<=_5;    
        4'd6:rSMG1<=_6;
        4'd7:rSMG1<=_7;    
        4'd8:rSMG1<=_8;
        4'd9:rSMG1<=_9;
        default:rSMG1<=_0;
    endcase
reg[7:0] rSMG2;
always@(posedge CLK or negedge RSTn)
if(!RSTn)
    rSMG2[7:0]<=8'hff;
else    
    case(TEMP/10)
        4'd0:rSMG2<=_0;
        4'd1:rSMG2<=_1;
        4'd2:rSMG2<=_2;
        4'd3:rSMG2<=_3;
        4'd4:rSMG2<=_4;
        4'd5:rSMG2<=_5;    
        4'd6:rSMG2<=_6;
        4'd7:rSMG2<=_7;    
        4'd8:rSMG2<=_8;
        4'd9:rSMG2<=_9;
        default:rSMG2<=_0;
    endcase
/********************************/
assign LED=Value;
assign SMG1=rSMG1;    
assign SMG2=rSMG2;
endmodule