//按键记数，数码管动态显示，两位
//
module test(clk,key,dispcode,CS);
input clk,key;
output reg [6:0] dispcode = N0;
output reg [1:0]CS;
reg [6:0]num;
reg [3:0]num_t;
reg [19:0]count1;
reg [7:0]count2;
reg timeflag;
reg keyflag = 1,lastkeyflag=1; // 1 up ,0 down
/*
共阴极 :不带小数点
0, 1, 2, 3, 4, 5, 6, 7,
3fh,06h,5bh,4fh,66h,6dh,7dh,07h
8, 9,
7fh,6fh,00h*/
parameter
N0 = 7'h3f,
N1 = 7'h06,
N2 = 7'h5b,
N3 = 7'h4f,
N4 = 7'h66,
N5 = 7'h6d,
N6 = 7'h7d,
N7 = 7'h07,
N8 = 7'h7f,
N9 = 7'h6f,
N10 = 7'h77;
always @(posedge clk)
begin
if(count1 < 20'd500000) //10ms
count1 = count1+1'd1;
else
begin
count1=0;
if(count2 < 1) //
count2=count2+1'd1;
else
begin
count2=0;
timeflag = ~timeflag; //每10ms翻转一次
end
end
end
always @(posedge timeflag) //延时去抖动
begin
if(lastkeyflag==0 && key == 0)
keyflag = 0;
if(lastkeyflag==1 && key == 1)
keyflag = 1;
lastkeyflag = key;
end
always @(negedge keyflag)
begin
num <= num + 1'd1; //对num的赋值必须用=，不能用<= ，否则num的值会显示100;而且必须统一
if(num>99)
num <= 0;
end
always @(posedge timeflag)
//数码管动态显示
begin
CS = CS + 1;
if(CS > 2'd2)
CS = 2'd1;
if(CS==2'd1)
num_t = num%10;
if(CS==2'd2)
num_t = num/10;
case(num_t)
4'd0 : dispcode = N0;
4'd1 : dispcode = N1;
4'd2 : dispcode = N2;
4'd3 : dispcode = N3;
4'd4 : dispcode = N4;
4'd5 : dispcode = N5;
4'd6 : dispcode = N6;
4'd7 : dispcode = N7;
4'd8 : dispcode = N8;
4'd9 : dispcode = N9;
4'd10: dispcode = N10;
default: dispcode = 7'h40;
endcase
end
endmodule
问题：
always @(posedge timeflag) //数码管动态显示
这条语句如果改成 always @(timeflag) 就不对了，timeflag我设置的是10ms翻转一次，改完之后应该动态扫描的频率更快了才对啊？
哪位大神指导一下，谢谢！ |
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