论坛» DIY与开源设计» 电子DIY

yancey小波
菜鸟
2012-11-05 23:12 11楼

实验一 数码管静态显示

代码

//Name: led_display.v
//Function:
// SW8---SW1 hgfedcba select
// sw[7:0] seg8[7:0] bit8[7:0]
//Author: YanceyLu

module led_display(sw,seg8,bit8);
input [7:0] sw;
output [7:0] seg8;
output [7:0] bit8;

reg [7:0] seg8;

assign bit8=0;

always @(sw)
begin
case(sw)
8'b11111110: seg8<=8'hf9;//1
8'b11111101: seg8<=8'ha4;//2
8'b11111011: seg8<=8'hb0;//3
8'b11110111: seg8<=8'h99;//4
8'b11101111: seg8<=8'h92;//5
8'b11011111: seg8<=8'h82;//6
8'b10111111: seg8<=8'hf8;//7
8'b01111111: seg8<=8'h80;//8
default: seg8<=8'hc0;//0
endcase
end
endmodule



效果视频

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yancey小波
菜鸟
2012-11-05 23:18 12楼
数码管第一个实验我做好了。你是碰到什么问题了？解决了没？
评论
yancey小波
菜鸟
2012-11-06 11:42 13楼

实验二 数码管动态显示

代码

//Name: scan_led.v
//Function: counter 60
// KEY8 50MHz PIN_27 SW8 hgfedcba select
// in clk rst seg8 bit8
//Author: YanceyLu

module scan_led(in,clk,rst,seg8,bit8);
input in,clk,rst;
output [7:0] seg8;
output [7:0] bit8;

reg [7:0] seg8;
reg [7:0] bit8;

reg [15:0] delay_cnt;
reg display_bit;
reg [5:0] cnt;

wire [3:0] data10;
wire [3:0] data1;
reg [7:0] map_data10;
reg [7:0] map_data1;

always @(posedge clk or negedge rst)
begin
if(!rst)
delay_cnt<=0;
else
begin
if(delay_cnt==49999)
delay_cnt<=0;
else
delay_cnt<=delay_cnt+1;
end
end

always @(posedge clk or negedge rst)
begin
if(!rst)
display_bit<=0;
else
begin
if(delay_cnt==49999)
display_bit<=display_bit+1;
else
display_bit<=display_bit;
end
end

always @(display_bit)
begin
case(display_bit)
0: bit8<=8'b11111110;
1: bit8<=8'b11111101;
endcase
end

always @(bit8)
begin
case(bit8)
8'b11111110: seg8<=map_data1;
8'b11111101: seg8<=map_data10;
endcase
end

always @(data10 or data1)
begin
case(data10)
0: map_data10<=8'hc0;//0
1: map_data10<=8'hf9;//1
2: map_data10<=8'ha4;//2
3: map_data10<=8'hb0;//3
4: map_data10<=8'h99;//4
5: map_data10<=8'h92;//5
endcase

case(data1)
0: map_data1<=8'hc0;//0
1: map_data1<=8'hf9;//1
2: map_data1<=8'ha4;//2
3: map_data1<=8'hb0;//3
4: map_data1<=8'h99;//4
5: map_data1<=8'h92;//5
6: map_data1<=8'h82;//6
7: map_data1<=8'hf8;//7
8: map_data1<=8'h80;//8
9: map_data1<=8'h90;//9
endcase
end

assign data10=cnt/10;
assign data1=cnt%10;

always @(negedge in or negedge rst)
begin
if(!rst)
cnt<=0;
else
begin
if(cnt==59)
cnt<=0;
else
cnt<=cnt+1;
end
end
endmodule



效果视频

由于没有对按键做处理，包括与时钟同步和变成单周期脉冲，所有按键计数有时会有些异常。
哈哈，多包涵！

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yancey小波
菜鸟
2012-11-13 17:19 14楼

实验一 按键控制数码管（未消抖）

代码

//Name: key.v
//Function:
// SW8 KEY8 hgfedcba select
// rst key seg8[7:0] bit8[7:0]
//Author: Yancey

module key(rst,key,seg8,bit8);
input rst,key;
output [7:0] seg8;
output [7:0] bit8;

assign bit8=8'b11111110;

reg [7:0] seg8;
reg [3:0] cnt;

always @(negedge key or negedge rst)
begin
if(!rst)
cnt<=0;
else
begin
if(cnt==9)
cnt<=0;
else
cnt<=cnt+1;
end
end

always @(cnt)
begin
case(cnt)
0: seg8<=8'hc0;//0
1: seg8<=8'hf9;//1
2: seg8<=8'ha4;//2
3: seg8<=8'hb0;//3
4: seg8<=8'h99;//4
5: seg8<=8'h92;//5
6: seg8<=8'h82;//6
7: seg8<=8'hf8;//7
8: seg8<=8'h80;//8
9: seg8<=8'h90;//9
endcase
end
endmodule



视频效果

按键未消抖的情况下，有时会检测到多次按下。

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yancey小波
菜鸟
2012-11-13 17:22 15楼

实验二 按键控制数码管（消抖）

代码

//Name: key_xiaodou.v
//Function:
// PIN_27 50MHz SW8 KEY8 hgfedcba select
// clk rst key seg8[7:0] bit8[7:0]
//Author: YanceyLu

module key_xiaodou(clk,rst,key,seg8,bit8);
input clk,rst,key;
output [7:0] seg8;
output [7:0] bit8;

key_delay_xiaodou key_delay(clk,rst,key,okey);

reg [7:0] seg8;
reg [3:0] cnt;
assign bit8=8'b11111110;

always @(posedge clk or negedge rst)
begin
if(!rst)
cnt<=0;
else if(!okey)
begin
if(cnt==9)
cnt<=0;
else
cnt<=cnt+1;
end
else
cnt<=cnt;
end

always @(cnt)
begin
case(cnt)
0: seg8<=8'hc0;//0
1: seg8<=8'hf9;//1
2: seg8<=8'ha4;//2
3: seg8<=8'hb0;//3
4: seg8<=8'h99;//4
5: seg8<=8'h92;//5
6: seg8<=8'h82;//6
7: seg8<=8'hf8;//7
8: seg8<=8'h80;//8
9: seg8<=8'h90;//9
endcase
end
endmodule




//Name: key_delay_xiaodou.v
//Function:
// push key: 0
// pop key: 1
// xiao dou,using delay.
//Author: YanceyLu

module key_delay_xiaodou(clk,rst,i_pulse,o_pulse);
input clk,rst,i_pulse;
output o_pulse;

reg [19:0] delay_cnt;
reg [1:0] pulse_reg;
reg [1:0] pulse_reg_new;
wire low;
wire low_new;

//Test falling edge
always @(posedge clk or negedge rst)
begin
if(!rst)
pulse_reg[0]<=1;
else
pulse_reg[0]<=i_pulse;
end

always @(posedge clk or negedge rst)
begin
if(!rst)
pulse_reg[1]<=1;
else
pulse_reg[1]<=pulse_reg[0];
end

assign low=pulse_reg[1]&(~pulse_reg[0]);

//Delay 20ms
always @(posedge clk or negedge rst)
begin
if(!rst)
delay_cnt<=0;
else if(low)
delay_cnt<=0;
else
delay_cnt<=delay_cnt+1;
end

//Test falling edge again
always @(posedge clk or negedge rst)
begin
if(!rst)
pulse_reg_new[0]<=1;
else if(delay_cnt==20'hfffff)
pulse_reg_new[0]<=i_pulse;
end

always @(posedge clk or negedge rst)
begin
if(!rst)
pulse_reg_new[1]<=1;
else
pulse_reg_new[1]<=pulse_reg_new[0];
end

assign low_new=pulse_reg_new[1]&(~pulse_reg_new[0]);
//Output
assign o_pulse=~low_new;
endmodule


视频效果

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yancey小波
菜鸟
2012-12-01 20:30 16楼

实验一 蜂鸣器发出救护车鸣笛

代码

//Name: jiuhuche.v
//Function:
// 50MHz PIN27 SW8 BEEP
// clk rst beep
//Author: YanceyLu
module jiuhuche(clk,rst,beep);
input clk,rst;
output beep;

reg beep;
reg [24:0] div_cnt;
reg [14:0] delay_cnt;
wire [14:0] delay_end;

parameter clk1=56817; //50000000/2*440-1
parameter clk2=28408; //50000000/4*440-1
assign delay_end=div_cnt[24]?clk1:clk2;

always @(posedge clk or negedge rst)
begin
if(!rst)
div_cnt<=0;
else
div_cnt<=div_cnt+1;
end

always @(posedge clk or negedge rst)
begin
if(!rst)
delay_cnt<=delay_end;
else if(delay_cnt==0)
begin
beep<=~beep;
delay_cnt<=delay_end;
end
else
delay_cnt<=delay_cnt-1;
end
endmodule



效果视频

评论
yancey小波
菜鸟
2012-12-01 20:35 17楼

实验二 蜂鸣器演奏音乐：两只老虎

代码

//Name: music.v
//Function: Play the music of two tigers
// 50MHz PIN27 SW8 BEEP
// clk rst beep
//
//Author: YanceyLu
module music(clk,rst,beep);
input clk,rst;
output beep;

reg beep;
reg [15:0] delay_cnt;
reg [15:0] delay_end;
reg [24:0] delay_cnt1;
reg [4:0] state;
reg [3:0] music;
reg clk_2Hz;

always @(posedge clk or negedge rst)
begin
if(!rst)
begin
clk_2Hz<=0;
delay_cnt1<=0;
end
else if(delay_cnt1==12499999)
begin
clk_2Hz<=~clk_2Hz;
delay_cnt1<=0;
end
else
delay_cnt1<=delay_cnt1+1;
end

always @(posedge clk_2Hz or negedge rst)
begin
if(!rst)
begin
state<=0;
music<=0;
end
else
case(state)
0: begin music<=1;state<=1; end
1: begin music<=2;state<=2; end
2: begin music<=3;state<=3; end
3: begin music<=1;state<=4; end
4: begin music<=1;state<=5; end
5: begin music<=2;state<=6; end
6: begin music<=3;state<=7; end
7: begin music<=1;state<=8; end
8: begin music<=3;state<=9; end
9: begin music<=4;state<=10; end
10: begin music<=5;state<=11; end
11: begin music<=3;state<=12; end
12: begin music<=4;state<=13; end
13: begin music<=5;state<=14; end
14: begin music<=5;state<=15; end
15: begin music<=6;state<=16; end
16: begin music<=5;state<=17; end
17: begin music<=4;state<=18; end
18: begin music<=3;state<=19; end
19: begin music<=1;state<=20; end
20: begin music<=5;state<=21; end
21: begin music<=6;state<=22; end
22: begin music<=5;state<=23; end
23: begin music<=4;state<=24; end
24: begin music<=3;state<=25; end
25: begin music<=1;state<=26; end
26: begin music<=3;state<=27; end
27: begin music<=5;state<=28; end
28: begin music<=1;state<=29; end
29: begin music<=3;state<=30; end
30: begin music<=5;state<=31; end
31: begin music<=1;state<=0; end
endcase
end

always @(posedge clk or negedge rst)
begin
if(!rst)
delay_cnt<=0;
else if((delay_cnt==delay_end)&(!(delay_end==16'hffff)))
begin
delay_cnt<=0;
beep<=~beep;
end
else
delay_cnt<=delay_cnt+1;
end

always @(music)
begin
case(music)
1: delay_end<=23912; //gaoyin 1
2: delay_end<=21282; //gaoyin 2
3: delay_end<=18961; //gaoyin 3
4: delay_end<=17897; //gaoyin 4
5: delay_end<=31888; //zhongyin 5
6: delay_end<=14205; //gaoyin 6
7: delay_end<=12655; //gaoyin 7
default: delay_end<=16'hffff;
endcase
end
endmodule


效果视频

评论
yancey小波
菜鸟
2012-12-20 18:06 18楼

实验一 lcd1602显示：静态显示

论坛提供的开发板LCD1602的电路好像有点问题，调显示对比度的那个引脚直接接了固定电阻，导致LCD显示的都是白块，不过可以看得出来确实有字符显示。


应该接可调电阻的，可以调节对比度就好了。

所以我用了另一个开发板做了这个实验。呵呵。



代码

//Name: lcd1602.v
//Function:
//
// Drive lcd1602 on DE2 board to display "1234567812345678
// abcdefghabcdefgh".
//
//
// PS: Input 50MHz clock.
//
//
//Author: YanceyLu

module lcd1602(sys_clk ,
sys_rstn ,
lcd_rs ,
lcd_rw ,
lcd_en ,
lcd_data ,
lcd_on , //Just for DE2 board
lcd_blon , //Just for DE2 board
);
//输入输出信号定义
input sys_clk ;//系统时钟输入
input sys_rstn ;//系统复位信号，低电平有效
output lcd_rs ;//lcd的寄存器选择输出信号
output lcd_rw ;//lcd的读、写操作选择输出信号
output lcd_en ;//lcd使能信号
output [7:0] lcd_data ;//lcd的数据总线（不进行读操作，故为输出）
output lcd_on ;//Just for DE2 board
output lcd_blon ;//Just for DE2 board
//寄存器定义
reg lcd_rs ;
reg clk_div ;
reg [17:0] delay_cnt ;
reg [7:0] lcd_data ;
reg [5:0] char_cnt ;
reg [7:0] data_disp ;
reg [9:0] state ;
parameter idle = 10'b000000000, //初始状态，下一个状态为CLEAR
clear = 10'b000000001, //清屏
set_function = 10'b000000010, //功能设置：8位数据接口/2行显示/5*8点阵字符
switch_mode = 10'b000000100, //显示开关控制：开显示，光标和闪烁关闭
set_mode = 10'b000001000, //输入方式设置：数据读写操作后，地址自动加一/画面不动
shift = 10'b000010000, //光标、画面位移设置：光标向左平移一个字符位（光标显示是关闭的，所以实际上设置是看不出效果的）
set_ddram1 = 10'b000100000, //设置DDRAM的地址：第一行起始为0x00（注意输出时DB7一定要为1）
set_ddram2 = 10'b001000000, //设置DDRAM的地址：第二行为0x40（注意输出时DB7一定要为1）
write_ram1 = 10'b010000000, //数据写入DDRAM相应的地址
write_ram2 = 10'b100000000; //数据写入DDRAM相应的地址

assign lcd_rw = 1'b0; //没有读操作，R/W信号始终为低电平
assign lcd_en = clk_div; //E信号出现高电平以及下降沿的时刻与LCD时钟相同
assign lcd_on=1; //Just for DE2 board
assign lcd_blon=1; //Just for DE2 board

//时钟分频
always@(posedgesys_clk or negedge sys_rstn)
begin
if(!sys_rstn)
begin
delay_cnt<=18'd0;
clk_div<=1'b0;
end
else if(delay_cnt==18'd249999)
begin
delay_cnt<=18'd0;
clk_div<=~clk_div;
end
else
begin
delay_cnt<=delay_cnt+1'b1;
clk_div<=clk_div;
end
end
always@(posedgeclk_div or negedge sys_rstn) //State Machine
begin
if(!sys_rstn)
begin
state <= idle;
lcd_data <= 8'bzzzzzzzz;
char_cnt <= 5'd0;
end
else
begin
case(state)
idle: begin //初始状态
state <= clear;
lcd_data <= 8'bzzzzzzzz;
end
clear: begin //清屏
state <= set_function;
lcd_rs<=1'b0;
lcd_data <= 8'b00000001;
end
set_function: //功能设置(38H)：8位数据接口/2行显示/5*8点阵字符
begin
state <= switch_mode;
lcd_rs<=1'b0;
lcd_data <= 8'b00111000;
end
switch_mode: //显示开关控制(0CH)：开显示，光标和闪烁关闭
begin
state <= set_mode;
lcd_rs<=1'b0;
lcd_data <= 8'b00001100;
end
set_mode:begin //输入方式设置(06H)：数据读写操作后，地址自动加一/画面不动
state <= shift;
lcd_rs<=1'b0;
lcd_data <= 8'b00000110;
end
shift: begin //光标、画面位移设置(10H)：光标向左平移一个字符位（光标显示是关闭的，所以实际上设置是看不出效果的）
state <= set_ddram1;
lcd_rs<=1'b0;
lcd_data <= 8'b0001_0000;
end
set_ddram1: //设置DDRAM的地址：第一行起始为00H（注意输出时DB7一定要为1）
begin
state <= write_ram1;
lcd_rs<=1'b0;
lcd_data <= 8'b1000_0000;//Line1
end
set_ddram2: //设置DDRAM的地址：第二行为40H（注意输出时DB7一定要为1）
begin
state <= write_ram2;
lcd_rs<=1'b0;
lcd_data <= 8'b1100_0000;//Line2
end
write_ram1:
begin
if(char_cnt <=5'd15)
begin
char_cnt <= char_cnt + 1'b1;
lcd_rs<=1'b1;
lcd_data <= data_disp;
state <= write_ram1;
end
else
begin
state <= set_ddram2;
end
end
write_ram2:
begin
if(char_cnt <=5'd31)
begin
char_cnt <= char_cnt + 1'b1;
lcd_rs<=1'b1;
lcd_data <= data_disp;
state <= write_ram2;
end
else
begin
char_cnt <=5'd0;
state <= set_ddram1;
end
end
default: state <= idle;
endcase
end
end

always @(char_cnt) //输出的字符
begin
case (char_cnt)
5'd0: data_disp = "1";
5'd1: data_disp = "2";
5'd2: data_disp = "3";
5'd3: data_disp = "4";
5'd4: data_disp = "5";
5'd5: data_disp = "6";
5'd6: data_disp = "7";
5'd7: data_disp = "8";
5'd8: data_disp = "1";
5'd9: data_disp = "2";
5'd10: data_disp = "3";
5'd11: data_disp = "4";
5'd12: data_disp = "5";
5'd13: data_disp = "6";
5'd14: data_disp = "7";
5'd15: data_disp = "8";
5'd16: data_disp = "a";
5'd17: data_disp = "b";
5'd18: data_disp = "c";
5'd19: data_disp = "d";
5'd20: data_disp = "e";
5'd21: data_disp = "f";
5'd22: data_disp = "g";
5'd23: data_disp = "h";
5'd24: data_disp = "a";
5'd25: data_disp = "b";
5'd26: data_disp = "c";
5'd27: data_disp = "d";
5'd28: data_disp = "e";
5'd29: data_disp = "f";
5'd30: data_disp = "g";
5'd31: data_disp = "h";
default : data_disp ="";
endcase
end
endmodule


效果照片

评论
yancey小波
菜鸟
2012-12-20 18:09 19楼

实验一 LCD1602显示：循环滚动显示


还是用的另一块开发板做的。


代码

//Name: lcd1602.v
//Function:
//
// Drive lcd1602 on DE2 board to display "1234567812345678
// 1234567812345678".
// And make the screen to roll from right side to left side.
//
// PS: Input 50MHz clock.
//
//
//Author: YanceyLu

module lcd1602(sys_clk ,
sys_rstn ,
lcd_rs ,
lcd_rw ,
lcd_en ,
lcd_data ,
lcd_on , //Just for DE2 board
lcd_blon , //Just for DE2 board
);
//输入输出信号定义
input sys_clk ;//系统时钟输入
input sys_rstn ;//系统复位信号，低电平有效
output lcd_rs ;//lcd的寄存器选择输出信号
output lcd_rw ;//lcd的读、写操作选择输出信号
output lcd_en ;//lcd使能信号
output [7:0] lcd_data ;//lcd的数据总线（不进行读操作，故为输出）
output lcd_on ;//Just for DE2 board
output lcd_blon ;//Just for DE2 board
//寄存器定义
reg lcd_rs ;
reg clk_div ;
reg [17:0] delay_cnt ;
reg [7:0] lcd_data ;
reg [5:0] char_cnt ;
reg [7:0] data_disp ;
reg [9:0] state ;
reg [3:0] char_shift ;
reg [1:0] delay_cnt1 ;
parameter idle = 10'b000000000, //初始状态，下一个状态为CLEAR
clear = 10'b000000001, //清屏
set_function = 10'b000000010, //功能设置：8位数据接口/2行显示/5*8点阵字符
switch_mode = 10'b000000100, //显示开关控制：开显示，光标和闪烁关闭
set_mode = 10'b000001000, //输入方式设置：数据读写操作后，地址自动加一/画面不动
shift = 10'b000010000, //光标、画面位移设置：光标向左平移一个字符位（光标显示是关闭的，所以实际上设置是看不出效果的）
set_ddram1 = 10'b000100000, //设置DDRAM的地址：第一行起始为0x00（注意输出时DB7一定要为1）
set_ddram2 = 10'b001000000, //设置DDRAM的地址：第二行为0x40（注意输出时DB7一定要为1）
write_ram1 = 10'b010000000, //数据写入DDRAM相应的地址
write_ram2 = 10'b100000000, //数据写入DDRAM相应的地址
delay = 3;

assign lcd_rw = 1'b0; //没有读操作，R/W信号始终为低电平
assign lcd_en = clk_div; //E信号出现高电平以及下降沿的时刻与LCD时钟相同
assign lcd_on=1; //Just for DE2 board
assign lcd_blon=1; //Just for DE2 board

//时钟分频
always@(posedgesys_clk or negedge sys_rstn)
begin
if(!sys_rstn)
begin
delay_cnt<=18'd0;
clk_div<=1'b0;
end
else if(delay_cnt==18'd249999)
begin
delay_cnt<=18'd0;
clk_div<=~clk_div;
end
else
begin
delay_cnt<=delay_cnt+1'b1;
clk_div<=clk_div;
end
end
always@(posedgeclk_div or negedge sys_rstn) //State Machine
begin
if(!sys_rstn)
begin
state <= idle;
lcd_data <= 8'bzzzzzzzz;
char_cnt <= 5'd0;
char_shift<=0;
delay_cnt1<=0;
end
else
begin
case(state)
idle: begin //初始状态
state <= clear;
lcd_data <= 8'bzzzzzzzz;
end
clear: begin //清屏
state <= set_function;
lcd_rs<=1'b0;
lcd_data <= 8'b00000001;
end
set_function: //功能设置(38H)：8位数据接口/2行显示/5*8点阵字符
begin
state <= switch_mode;
lcd_rs<=1'b0;
lcd_data <= 8'b00111000;
end
switch_mode: //显示开关控制(0CH)：开显示，光标和闪烁关闭
begin
state <= set_mode;
lcd_rs<=1'b0;
lcd_data <= 8'b00001100;
end
set_mode:begin //输入方式设置(06H)：数据读写操作后，地址自动加一/画面不动
state <= shift;
lcd_rs<=1'b0;
lcd_data <= 8'b00000110;
end
shift: begin //光标、画面位移设置(10H)：光标向左平移一个字符位（光标显示是关闭的，所以实际上设置是看不出效果的）
state <= set_ddram1;
lcd_rs<=1'b0;
lcd_data <= 8'b0001_0000;
end
set_ddram1: //设置DDRAM的地址：第一行起始为00H（注意输出时DB7一定要为1）
begin
state <= write_ram1;
lcd_rs<=1'b0;
lcd_data <= 8'b1000_0000;//Line1

end
set_ddram2: //设置DDRAM的地址：第二行为40H（注意输出时DB7一定要为1）
begin
state <= write_ram2;
lcd_rs<=1'b0;
lcd_data <= 8'b1100_0000;//Line2
end
write_ram1:
begin
if(char_cnt <=5'd15)
begin
char_cnt <= char_cnt + 1'b1;
lcd_rs<=1'b1;
lcd_data <= data_disp;
state <= write_ram1;
end
else
begin
char_cnt <= 0;
state <= set_ddram2;
end
end
write_ram2:
begin
if(char_cnt <=5'd15)
begin
char_cnt <= char_cnt + 1'b1;
lcd_rs<=1'b1;
lcd_data <= data_disp;
state <= write_ram2;
end
else
begin
char_cnt <=5'd0;
state <= delay;
end
end
delay:
begin
delay_cnt1<=delay_cnt1+1;
state<=set_ddram1;
if(delay_cnt1==2'b11)
char_shift <= char_shift-1;
end
default: state <= idle;
endcase
end
end

always @(char_cnt) //输出的字符
begin
case (char_cnt)
char_shift&4'b1111: data_disp = "1";
(char_shift+1)&4'b1111: data_disp = "2";
(char_shift+2)&4'b1111: data_disp = "3";
(char_shift+3)&4'b1111: data_disp = "4";
(char_shift+4)&4'b1111: data_disp = "5";
(char_shift+5)&4'b1111: data_disp = "6";
(char_shift+6)&4'b1111: data_disp = "7";
(char_shift+7)&4'b1111: data_disp = "8";
(char_shift+8)&4'b1111: data_disp = "1";
(char_shift+9)&4'b1111: data_disp = "2";
(char_shift+10)&4'b1111: data_disp = "3";
(char_shift+11)&4'b1111: data_disp = "4";
(char_shift+12)&4'b1111: data_disp = "5";
(char_shift+13)&4'b1111: data_disp = "6";
(char_shift+14)&4'b1111: data_disp = "7";
(char_shift+15)&4'b1111: data_disp = "8";
default : data_disp = "";
endcase
end
endmodule


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