题目为：将按键值显示在7端数码管上，并在数码管上完成显示键值的移动，例如第一次按键“1”，数码管显示“1”，第二次按键“2”，数码管显示“12”，
我的代码：在按下1后不显示，在按下2后显示1，在按下三后显示2，也就是显示上次按键
行已上拉电阻
module juzhenjianpan(row,col,clk,reset,led,pian);
//行：row 列：col
input clk,reset;
input [3:0] row;
output [3:0] col;
output [7:0] led;
output [2:0] pian;
reg[3:0] col;
reg[3:0] row_reg,col_reg;
reg clk2; //分频用clk2
reg [5:0] count=0;//10计数表示20ms的延迟
reg [2:0] state=0;
reg[3:0] key_value;
reg[2:0] pian=3'b111;
reg [7:0] led;
reg [7:0] led0;
reg [0:0] panduan;
reg [7:0]seg[7:0];
reg flag;
always @(posedge clk)
begin
if(count>=10)
begin
clk2<=~clk2;
count<=0;
end
else count<=count+1;
end
always @ (*)
begin
if(!reset) begin led0=8'b00000000;end
else begin
case(key_value)
0: led0=8'b11111100;
1: led0=8'b01100000;
2: led0=8'b11011010;
3: led0=8'b11110010;
4: led0=8'b01100110;
5: led0=8'b10110110;
6: led0=8'b10111110;
7: led0=8'b11100000;
8: led0=8'b11111110;
9: led0=8'b11110110;
10: led0=8'b11101110;
11: led0=8'b00111110;
12: led0=8'b10011100;
13: led0=8'b01111010;
14: led0=8'b10011110;
15: led0=8'b10001110;
default:led0=8'b00000000;
endcase
end
end
always @(posedge clk2)
begin
if(!reset) begin col<=4'b0000;
seg[0][7:0]=8'b00000000;
seg[1][7:0]=8'b00000000;
seg[2][7:0]=8'b00000000;
seg[3][7:0]=8'b00000000;
seg[4][7:0]=8'b00000000;
seg[5][7:0]=8'b00000000;
seg[6][7:0]=8'b00000000;
seg[7][7:0]=8'b00000000;
end
else
begin
case(state)
0:begin
col<=4'b0000; //检测是否有按键按下，当有按下跳入1中，否则一直扫描
panduan<=0;
flag<=1;
if(row!=4'b1111)
begin
state<=1;
col<=4'b1110;
end
else state<=0;
end
1:begin
if(row!=4'b1111)
begin
state<=5;
end
else begin state<=2;
col<=4'b1101;
end
end
2:begin
if(row!=4'b1111)
begin
state<=5;
end
else begin
state<=3;
col<=4'b1011;
end
end
3:begin
if(row!=4'b1111)
begin
state<=5;
end
else begin
state<=4;
col<=4'b0111;
end
end
4:begin
col<=4'b0111;
if(row!=4'b1111)
begin
state<=5;
end
else state<=0;
end
5:begin
if(row!=4'b1111)
begin
col_reg<=col;
row_reg<=row;
panduan<=1;
state<=5;
end
else begin
state<=0;
end
end
endcase
case ({col_reg,row_reg})
8'b1110_1110:key_value=10;
8'b1110_1101:key_value=11;
8'b1110_1011:key_value=12;
8'b1110_0111:key_value=13;
8'b1101_1110:key_value=3;
8'b1101_1101:key_value=6;
8'b1101_1011:key_value=9;
8'b1101_0111:key_value=15;
8'b1011_1110:key_value=2;
8'b1011_1101:key_value=5;
8'b1011_1011:key_value=8;
8'b1011_0111:key_value=0;
8'b0111_1110:key_value=1;
8'b0111_1101:key_value=4;
8'b0111_1011:key_value=7;
8'b0111_0111:key_value=14;
endcase
end
if(panduan&&flag)
begin
seg[0][7:0]<=led0;
seg[1][7:0]<=led0;
seg[2][7:0]<=seg[1][7:0];
seg[3][7:0]<=seg[2][7:0];
seg[4][7:0]<=seg[3][7:0];
seg[5][7:0]<=seg[4][7:0];
seg[6][7:0]<=seg[5][7:0];
seg[7][7:0]<=seg[6][7:0];
panduan<=1;
flag<=0;
end
end
always @ (posedge clk)
begin
if(!reset)
begin led=8'b00000000;
end
else
begin
pian=pian-1;
led=seg[pian][7:0];
end
end
endmodule
我认为出错的原因在于阻塞和非阻塞赋值，但是并没有解决
按键不再延迟显示
module juzhenjianpan(row,col,clk,reset,led,pian);
//行：row 列：col
input clk,reset;
input [3:0] row;
output [3:0] col;
output [7:0] led;
output [2:0] pian;
reg[3:0] col;
reg[3:0] row_reg,col_reg;
reg clk2; //分频用clk2
reg [5:0] count=0;//10计数表示20ms的延迟
reg [2:0] state=0;
reg[3:0] key_value;
reg[2:0] pian=3'b111;
reg [7:0] led;
reg [7:0] led0;
reg [0:0] panduan;
reg [7:0]seg[7:0];
reg flag;
always @(posedge clk)
begin
if(count>=10)
begin
clk2<=~clk2;
count<=0;
end
else count<=count+1;
end
always @ (*)
begin
if(!reset) begin led0=8'b00000000;end
else begin
case(key_value)
0: led0=8'b11111100;
1: led0=8'b01100000;
2: led0=8'b11011010;
3: led0=8'b11110010;
4: led0=8'b01100110;
5: led0=8'b10110110;
6: led0=8'b10111110;
7: led0=8'b11100000;
8: led0=8'b11111110;
9: led0=8'b11110110;
10: led0=8'b11101110;
11: led0=8'b00111110;
12: led0=8'b10011100;
13: led0=8'b01111010;
14: led0=8'b10011110;
15: led0=8'b10001110;
default:led0=8'b00000000;
endcase
end
end
always @(posedge clk2)
begin
if(!reset) begin col<=4'b0000;
seg[0][7:0]=8'b00000000;
seg[1][7:0]=8'b00000000;
seg[2][7:0]=8'b00000000;
seg[3][7:0]=8'b00000000;
seg[4][7:0]=8'b00000000;
seg[5][7:0]=8'b00000000;
seg[6][7:0]=8'b00000000;
seg[7][7:0]=8'b00000000;
end
else
begin
case(state)
0:begin
col<=4'b0000; //检测是否有按键按下，当有按下跳入1中，否则一直扫描
panduan<=0;
flag<=1;
if(row!=4'b1111)
begin
state<=1;
col<=4'b1110;
end
else state<=0;
end
1:begin
if(row!=4'b1111)
begin
state<=5;
end
else begin state<=2;
col<=4'b1101;
end
end
2:begin
if(row!=4'b1111)
begin
state<=5;
end
else begin
state<=3;
col<=4'b1011;
end
end
3:begin
if(row!=4'b1111)
begin
state<=5;
end
else begin
state<=4;
col<=4'b0111;
end
end
4:begin
col<=4'b0111;
if(row!=4'b1111)
begin
state<=5;
end
else state<=0;
end
5:begin
if(row!=4'b1111)
begin
col_reg<=col;
row_reg<=row;
panduan<=1;
state<=5;
end
else begin
state<=0;
end
end
endcase
// case ({col_reg,row_reg})
// 8'b1110_1110:key_value=10;
// 8'b1110_1101:key_value=11;
// 8'b1110_1011:key_value=12;
// 8'b1110_0111:key_value=13;
// 8'b1101_1110:key_value=3;
// 8'b1101_1101:key_value=6;
// 8'b1101_1011:key_value=9;
// 8'b1101_0111:key_value=15;
// 8'b1011_1110:key_value=2;
// 8'b1011_1101:key_value=5;
// 8'b1011_1011:key_value=8;
// 8'b1011_0111:key_value=0;
// 8'b0111_1110:key_value=1;
// 8'b0111_1101:key_value=4;
// 8'b0111_1011:key_value=7;
// 8'b0111_0111:key_value=14;
// endcase
end
if(panduan&&flag)
begin
seg[0][7:0]<=led0;
seg[1][7:0]<=led0;
seg[2][7:0]<=seg[1][7:0];
seg[3][7:0]<=seg[2][7:0];
seg[4][7:0]<=seg[3][7:0];
seg[5][7:0]<=seg[4][7:0];
seg[6][7:0]<=seg[5][7:0];
seg[7][7:0]<=seg[6][7:0];
panduan<=1;
flag<=0;
end
end
always @ (posedge clk)
begin
if(!reset)
begin led=8'b00000000;
end
else
begin
pian=pian-1;
led=seg[pian][7:0];
end
end
always @(posedge clk)
begin
if(!reset)
begin
key_value = 0;
end
else
begin
case ({col_reg,row_reg})
8'b1110_1110:key_value=10;
8'b1110_1101:key_value=11;
8'b1110_1011:key_value=12;
8'b1110_0111:key_value=13;
8'b1101_1110:key_value=3;
8'b1101_1101:key_value=6;
8'b1101_1011:key_value=9;
8'b1101_0111:key_value=15;
8'b1011_1110:key_value=2;
8'b1011_1101:key_value=5;
8'b1011_1011:key_value=8;
8'b1011_0111:key_value=0;
8'b0111_1110:key_value=1;
8'b0111_1101:key_value=4;
8'b0111_1011:key_value=7;
8'b0111_0111:key_value=14;
endcase
end
end
endmodule