//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;endelse     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;endelse    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    endcasereg[7:0] TEMP;//要计算到99//reg[7:0]TEMP1;//储存TEMPreg 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    endreg[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;    endcasereg[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