2014年6月13日 星期五

16x2 LCD 顯示2個TEXT Pattern 輪流顯示-----適用於DE2-70

16x2 LCD 顯示2個TEXT Pattern 輪流顯示

I like FPGA!                                   hello word!
                           <<=====>>  
hello word!                                     I like FPGA!   

利用 Timer 切換2x1多工器  多工器 輸入為LCD_RS,LCD_EN,LCD_RW,_LCD_DATA





module LCD_Example(
  input CLOCK_50,     //    50 MHz clock
  input [3:0] KEY,      //    Pushbutton[3:0]
  input [17:0] SW,     //    Toggle Switch[17:0]
  output [6:0]    HEX0,HEX1,HEX2,HEX3,HEX4,HEX5,HEX6,HEX7,  // Seven Segment Digits
  output [8:0] LEDG,   //    LED Green
  output [17:0] LEDR,   //    LED Red
  inout [35:0] GPIO_0,GPIO_1,    //    GPIO Connections
//    LCD Module 16X2
  output LCD_ON,     // LCD Power ON/OFF
  output LCD_BLON,     // LCD Back Light ON/OFF
  output LCD_RW,     // LCD Read/Write Select, 0 = Write, 1 = Read
  output LCD_EN,     // LCD Enable
  output LCD_RS,     // LCD Command/Data Select, 0 = Command, 1 = Data
  inout [7:0] LCD_DATA, // LCD Data bus 8 bits
  input  UART_RXD, //RS232 RXD
  output UART_TXD //RS232 TXD
);

//    All inout port turn to tri-state
assign    GPIO_0        =    36'hzzzzzzzzz;
assign    GPIO_1        =    36'hzzzzzzzzz;

wire  clk_25Mout ,clk_2sec;

assign HEX0=7'b111_1111;  //off 7-segment Display
assign HEX1=7'b111_1111;
assign HEX2=7'b111_1111;
assign HEX3=7'b111_1111;
assign HEX4=7'b111_1111;
assign HEX5=7'b111_1111;
assign HEX6=7'b111_1111;
assign HEX7=7'b111_1111;

// Send switches to red leds 
assign LEDR = SW;

// turn LCD ON
assign    LCD_ON      =    1'b1;
assign    LCD_BLON    =    1'b1;

wire LCD_EN1,LCD_EN2,LCD_RS1,LCD_RS2,LCD_RW1,LCD_RW2;
wire [7:0] LCD_DATA1,LCD_DATA2;

//module clk_div_1hz(clk_in , Reset, clk_25Mout);
clk_div_25MHz u0 (CLOCK_50 , KEY[0], clk_25Mout);

clk_div_2sec(CLOCK_50 ,KEY[0], clk_2sec);


//lcd_1602_1(sysclk,Enable, rst_n, lcd_en, lcd_rs, lcd_rw, lcd_data ); 
lcd1_1602 u1 (clk_25Mout,
KEY[0], 
LCD_EN1, 
LCD_RS1, 
LCD_RW1,
LCD_DATA1
); 

lcd2_1602 u2 (clk_25Mout,
KEY[0], 
LCD_EN2, 
LCD_RS2, 
LCD_RW2,
LCD_DATA2
); 

mux_2x1 u3 ( LCD_EN1,
LCD_EN2,
LCD_RS1,
LCD_RS2,
LCD_RW1,
LCD_RW2,
LCD_DATA1,
LCD_DATA2,
clk_2sec,   //Toggle LCD Text 
LCD_EN,
LCD_RS,
LCD_RW,
LCD_DATA
             );
             


endmodule

module  mux_2x1(
  input LCD_EN1,
  input LCD_EN2,
  input LCD_RS1,
  input LCD_RS2,
  input LCD_RW1,
  input LCD_RW2,
  input [7:0] LCD_DATA1,
  input [7:0] LCD_DATA2,
  input sel,
  output reg  LCD_EN,
  output reg  LCD_RS,
  output reg  LCD_RW,
  output reg  [7:0] LCD_DATA
  );
  
  
  always @ (sel,LCD_EN1,LCD_EN2,LCD_RS1,LCD_RS2,LCD_RW1,LCD_RW2,LCD_DATA1,LCD_DATA2)
  begin 
     if (sel == 1'b0) 
         begin
         LCD_EN=LCD_EN1;
         LCD_RS=LCD_RS1;
         LCD_RW=LCD_RW1;
         LCD_DATA=LCD_DATA1;
         end 
     else 
         begin
         LCD_EN=LCD_EN2;
         LCD_RS=LCD_RS2;
         LCD_RW=LCD_RW2;
         LCD_DATA=LCD_DATA2;
         end
  end

 endmodule



module lcd1_1602(sysclk, rst_n, lcd_en, lcd_rs, lcd_rw, lcd_data ); 
 input sysclk; //系統時鐘 50MHZ 
 input rst_n; //復位信號,低電平有效;  

 output lcd_en; //讀寫使能信號,高電平有效; 
 output reg lcd_rs; //數據命令選擇端(H/L); 
 output lcd_rw; //讀寫選擇端(H/L); 
 output reg [7:0] lcd_data; //8位數據口;  


 parameter [127:0]row2="  hello world!  "; 
 //因為lcd1602每一行可顯示16個字符,一個字符占8位; 
 parameter [127:0]row1="  I like FPGA!  "; 
 //所以每一行一共有16*8=128位;  

 reg [15:0] time_cnt; 

 always @(posedge sysclk or negedge rst_n) 
  begin 
  if(!rst_n) 
     time_cnt<=16'h0; 
  else 
     time_cnt<=time_cnt+16'b1;  
  end 
  
  assign lcd_rw=1'b0; 
  assign lcd_en=time_cnt[15]; 
  wire state_flag ; 
  //狀態標誌位 ,因為FPGA的運算速度比LCD1602要快的多, 
  //所以必須要等到LCD1602穩定後才往裏面寫數據; 
  
  assign state_flag=(time_cnt==16'h7fff)?1'b1:1'b0 ; 
  //lcd_en最小值500ns ,所以lcd_en的頻率應維持在2MHZ以內;   
  
  parameter IDLE=8'h00; //lcd1602 initial; 
  parameter INI_SET=8'h01; //顯示工作模式設置;  
  parameter INI_CLR=8'h02; //清屏顯示;  
  parameter CURSOR_SET1=8'h03; // 光標設置1;  
  parameter CURSOR_SET2=8'h04; //光標設置2;  
  
  //display line 1; 
  parameter LINE1_ADDER=8'h05;  
  
  parameter LINE1_0=8'h06;  
  parameter LINE1_1=8'h07;  
  parameter LINE1_2=8'h08;  
  parameter LINE1_3=8'h09;  
  parameter LINE1_4=8'h0A;  
  parameter LINE1_5=8'h0B;  
  parameter LINE1_6=8'h0C;  
  parameter LINE1_7=8'h0D;  
  parameter LINE1_8=8'h0E;  
  parameter LINE1_9=8'h0F;  
  parameter LINE1_A=8'h10;  
  parameter LINE1_B=8'h11;  
  parameter LINE1_C=8'h12;  
  parameter LINE1_D=8'h13;  
  parameter LINE1_E=8'h14;  
  parameter LINE1_F=8'h15; 
  
  // display line 2; 
  parameter LINE2_ADDER=8'h16;  
  
  parameter LINE2_0=8'h17;  
  parameter LINE2_1=8'h18;  
  parameter LINE2_2=8'h19;  
  parameter LINE2_3=8'h1A;  
  parameter LINE2_4=8'h1B;  
  parameter LINE2_5=8'h1C;  
  parameter LINE2_6=8'h1D;  
  parameter LINE2_7=8'h1E;  
  parameter LINE2_8=8'h1F;  
  parameter LINE2_9=8'h20;  
  parameter LINE2_A=8'h21;  
  parameter LINE2_B=8'h22;  
  parameter LINE2_C=8'h23;  
  parameter LINE2_D=8'h24;  
  parameter LINE2_E=8'h25;  
  parameter LINE2_F=8'h26; 
  
  //------------------------------------------------// 
  reg[7:0] state; 
  reg[7:0] next_state; 
      
 always @ (posedge sysclk or negedge rst_n) 
 begin 
    if(!rst_n ) 
state<=IDLE; 
    else if(state_flag) 
state<=next_state; 
   end 

  always @ (*) 
  begin 
    case(state) //display line1; 
    IDLE : next_state=INI_SET; 
    INI_SET : next_state=INI_CLR; 
    INI_CLR : next_state=CURSOR_SET1; 
    CURSOR_SET1 : next_state=CURSOR_SET2; 
    CURSOR_SET2 : next_state=LINE1_ADDER; 
    
    LINE1_ADDER : next_state=LINE1_0; 
    
    LINE1_0 : next_state=LINE1_1; 
    LINE1_1 : next_state=LINE1_2; 
    LINE1_2 : next_state=LINE1_3; 
    LINE1_3 : next_state=LINE1_4; 
    LINE1_4 : next_state=LINE1_5; 
    LINE1_5 : next_state=LINE1_6; 
    LINE1_6 : next_state=LINE1_7; 
    LINE1_7 : next_state=LINE1_8; 
    LINE1_8 : next_state=LINE1_9; 
    LINE1_9 : next_state=LINE1_A; 
    LINE1_A : next_state=LINE1_B; 
    LINE1_B : next_state=LINE1_C; 
    LINE1_C : next_state=LINE1_D; 
    LINE1_D : next_state=LINE1_E; 
    LINE1_E : next_state=LINE1_F; 
    LINE1_F : next_state=LINE2_ADDER; 
    
    //display line2; 
    LINE2_ADDER : next_state=LINE2_0; 
    
    LINE2_0 : next_state=LINE2_1; 
    LINE2_1 : next_state=LINE2_2; 
    LINE2_2 : next_state=LINE2_3; 
    LINE2_3 : next_state=LINE2_4; 
    LINE2_4 : next_state=LINE2_5; 
    LINE2_5 : next_state=LINE2_6; 
    LINE2_6 : next_state=LINE2_7; 
    LINE2_7 : next_state=LINE2_8; 
    LINE2_8 : next_state=LINE2_9; 
    LINE2_9 : next_state=LINE2_A; 
    LINE2_A : next_state=LINE2_B; 
    LINE2_B : next_state=LINE2_C; 
    LINE2_C : next_state=LINE2_D; 
    LINE2_D : next_state=LINE2_E; 
    LINE2_E : next_state=LINE2_F; 
    LINE2_F : next_state=LINE1_ADDER;
     
    default : next_state=IDLE; 
   endcase 
  end 

 always @ (posedge sysclk or negedge rst_n) 
 begin 
  if(!rst_n) 
begin 
lcd_rs   <= 1'b0; 
lcd_data <= 8'hxx; 
end 
  else if(state_flag)
    begin 
    case (next_state) 
     IDLE :  begin
                   lcd_rs <= 1'h0;
                   lcd_data <=8'hxx;  
                   end
                     
     INI_SET : begin
lcd_rs <= 1'h0;
lcd_data <=8'h38;
end  
     INI_CLR : begin
lcd_rs <= 1'h0;
lcd_data <=8'h01;
end
     CURSOR_SET1: begin
lcd_rs <= 1'h0;
lcd_data <=8'h06;
end  
     CURSOR_SET2: begin
lcd_rs <= 1'h0;
lcd_data <=8'h0c;
end 
     // line1 
     LINE1_ADDER: begin
lcd_rs <= 1'h0;
lcd_data <=8'h80;
end   
     LINE1_0 : begin
lcd_rs <= 1'h1;
lcd_data <=row1[127:120]; 
end  
     LINE1_1 : begin
lcd_rs <= 1'h1;
lcd_data <=row1[119:112];  
end 
     LINE1_2 : begin
lcd_rs <= 1'h1;
lcd_data <=row1[111:104];
end   
     LINE1_3 : begin
lcd_rs <= 1'h1;
lcd_data <=row1[103:96];
end  
     LINE1_4 : begin
lcd_rs <= 1'h1;
lcd_data <=row1[95:88]; 
end  
     LINE1_5 : begin
lcd_rs <= 1'h1;
lcd_data <=row1[87:80];
end  
     LINE1_6 : begin
lcd_rs <= 1'h1;
lcd_data <=row1[79:72];
end   
     LINE1_7 : begin 
lcd_rs <= 1'h1;
lcd_data <=row1[71:64]; 
end  
     LINE1_8 : begin 
lcd_rs <= 1'h1;
lcd_data <=row1[63:56]; 
end  
     LINE1_9 : begin
lcd_rs <= 1'h1;
lcd_data <=row1[55:48];
end  
     LINE1_A : begin
lcd_rs <= 1'h1;
lcd_data <=row1[47:40]; 
end   
     LINE1_B : begin 
lcd_rs <= 1'h1;
lcd_data <=row1[39:32]; 
end  
     LINE1_C : begin
lcd_rs <= 1'h1;
lcd_data <=row1[31:24]; 
end  
     LINE1_D : begin
lcd_rs <= 1'h1;
lcd_data <=row1[23:16]; 
end  
     LINE1_E : begin
lcd_rs <= 1'h1;
lcd_data <=row2[15:8]; 
end   
     LINE1_F : begin
lcd_rs <= 1'h1;
lcd_data <=row1[7:0];  
end
     // line2  
     LINE2_ADDER: begin
lcd_rs <=1'h0;
lcd_data <=8'hC0; 
end

LINE2_0 : begin
lcd_rs <= 1'h1;
lcd_data <=row2[127:120]; 
end  
     LINE2_1 : begin
lcd_rs <= 1'h1;
lcd_data <=row2[119:112];  
end 
     LINE2_2 : begin
lcd_rs <= 1'h1;
lcd_data <=row2[111:104];
end   
     LINE2_3 : begin
lcd_rs <= 1'h1;
lcd_data <=row2[103:96];
end  
     LINE2_4 : begin
lcd_rs <= 1'h1;
lcd_data <=row2[95:88]; 
end  
     LINE2_5 : begin
lcd_rs <= 1'h1;
lcd_data <=row2[87:80];
end  
     LINE2_6 : begin
lcd_rs <= 1'h1;
lcd_data <=row2[79:72];
end   
     LINE2_7 : begin 
lcd_rs <= 1'h1;
lcd_data <=row2[71:64]; 
end  
     LINE2_8 : begin 
lcd_rs <= 1'h1;
lcd_data <=row2[63:56]; 
end  
     LINE2_9 : begin
lcd_rs <= 1'h1;
lcd_data <=row2[55:48];
end  
     LINE2_A : begin
lcd_rs <= 1'h1;
lcd_data <=row2[47:40]; 
end   
     LINE2_B : begin 
lcd_rs <= 1'h1;
lcd_data <=row2[39:32]; 
end  
     LINE2_C : begin
lcd_rs <= 1'h1;
lcd_data <=row2[31:24]; 
end  
     LINE2_D : begin
lcd_rs <= 1'h1;
lcd_data <=row2[23:16]; 
end  
     LINE2_E : begin
lcd_rs <= 1'h1;
lcd_data <=row2[15:8]; 
end   
     LINE2_F : begin
lcd_rs <= 1'h1;
lcd_data <=row2[7:0];  
end

      
  endcase 
    
  /* case(next_state) 
     IDLE : lcd_data <=8'hxx;  
     INI_SET : lcd_data <=8'h38; 
     //設置16*2顯示,5*7點陣,8位數據接口;  
     INI_CLR : lcd_data <=8'h01; //清屏顯示;  
     CURSOR_SET1: lcd_data <=8'h06; 
     //寫一個字符後地址指針加一;   
     CURSOR_SET2: lcd_data <=8'h0c; 
     //設置開顯示,不顯示光標; 
     //line1  
     LINE1_ADDER: lcd_data <=8'h80; 
     //LCD1602第一行 首地址;   
     LINE1_0 : lcd_data <=row1[127:120]; 
     LINE1_1 : lcd_data <=row1[119:112]; 
     LINE1_2 : lcd_data <=row1[111:104]; 
     LINE1_3 : lcd_data <=row1[103:96]; 
     LINE1_4 : lcd_data <=row1[95:88]; 
     LINE1_5 : lcd_data <=row1[87:80]; 
     LINE1_6 : lcd_data <=row1[79:72]; 
     LINE1_7 : lcd_data <=row1[71:64]; 
     LINE1_8 : lcd_data <=row1[63:56]; 
     LINE1_9 : lcd_data <=row1[55:48]; 
     LINE1_A : lcd_data <=row1[47:40]; 
     LINE1_B : lcd_data <=row1[39:32]; 
     LINE1_C : lcd_data <=row1[31:24]; 
     LINE1_D : lcd_data <=row1[23:16]; 
     LINE1_E : lcd_data <=row1[15:8]; 
     LINE1_F : lcd_data <=row1[7:0]; 
     
     //line2 
     LINE2_ADDER: lcd_data <=8'hC0; 
     //LCD1602第二行首地址(8'h80+8'h40=8'hC0) 
     LINE2_0 : lcd_data <=row2[127:120]; 
     LINE2_1 : lcd_data <=row2[119:112]; 
     LINE2_2 : lcd_data <=row2[111:104]; 
     LINE2_3 : lcd_data <=row2[103:96]; 
     LINE2_4 : lcd_data <=row2[95:88]; 
     LINE2_5 : lcd_data <=row2[87:80]; 
     LINE2_6 : lcd_data <=row2[79:72]; 
     LINE2_7 : lcd_data <=row2[71:64]; 
     LINE2_8 : lcd_data <=row2[63:56]; 
     LINE2_9 : lcd_data <=row2[55:48]; 
     LINE2_A : lcd_data <=row2[47:40]; 
     LINE2_B : lcd_data <=row2[39:32]; 
     LINE2_C : lcd_data <=row2[31:24]; 
     LINE2_D : lcd_data <=row2[23:16]; 
     LINE2_E : lcd_data <=row2[15:8]; 
     LINE2_F : lcd_data <=row2[7:0]; 
    endcase */ 
   end 
  
  end 
  
endmodule     



//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++

module lcd2_1602(sysclk, rst_n, lcd_en, lcd_rs, lcd_rw, lcd_data ); 
 input sysclk; //系統時鐘 50MHZ 
 input rst_n; //復位信號,低電平有效;  


 output lcd_en; //讀寫使能信號,高電平有效; 
 output reg lcd_rs; //數據命令選擇端(H/L); 
 output lcd_rw; //讀寫選擇端(H/L); 
 output reg [7:0] lcd_data; //8位數據口;  


 parameter [127:0]row1="    hello world!"; 
 //因為lcd1602每一行可顯示16個字符,一個字符占8位; 
 parameter [127:0]row2="    I like FPGA!"; 
 //所以每一行一共有16*8=128位;  

 reg [15:0] time_cnt; 

 always @(posedge sysclk or negedge rst_n) 
  begin 
  if(!rst_n) 
     time_cnt<=16'h0; 
  else 
     time_cnt<=time_cnt+16'b1;  
  end 
  
  assign lcd_rw=1'b0; 
  assign lcd_en=time_cnt[15]; 
  wire state_flag ; 
  //狀態標誌位 ,因為FPGA的運算速度比LCD1602要快的多, 
  //所以必須要等到LCD1602穩定後才往裏面寫數據; 
  
  assign state_flag=(time_cnt==16'h7fff)?1'b1:1'b0 ; 
  //lcd_en最小值500ns ,所以lcd_en的頻率應維持在2MHZ以內;   
  
  parameter IDLE=8'h00; //lcd1602 initial; 
  parameter INI_SET=8'h01; //顯示工作模式設置;  
  parameter INI_CLR=8'h02; //清屏顯示;  
  parameter CURSOR_SET1=8'h03; // 光標設置1;  
  parameter CURSOR_SET2=8'h04; //光標設置2;  
  
  //display line 1; 
  parameter LINE1_ADDER=8'h05;  
  
  parameter LINE1_0=8'h06;  
  parameter LINE1_1=8'h07;  
  parameter LINE1_2=8'h08;  
  parameter LINE1_3=8'h09;  
  parameter LINE1_4=8'h0A;  
  parameter LINE1_5=8'h0B;  
  parameter LINE1_6=8'h0C;  
  parameter LINE1_7=8'h0D;  
  parameter LINE1_8=8'h0E;  
  parameter LINE1_9=8'h0F;  
  parameter LINE1_A=8'h10;  
  parameter LINE1_B=8'h11;  
  parameter LINE1_C=8'h12;  
  parameter LINE1_D=8'h13;  
  parameter LINE1_E=8'h14;  
  parameter LINE1_F=8'h15; 
  
  // display line 2; 
  parameter LINE2_ADDER=8'h16;  
  
  parameter LINE2_0=8'h17;  
  parameter LINE2_1=8'h18;  
  parameter LINE2_2=8'h19;  
  parameter LINE2_3=8'h1A;  
  parameter LINE2_4=8'h1B;  
  parameter LINE2_5=8'h1C;  
  parameter LINE2_6=8'h1D;  
  parameter LINE2_7=8'h1E;  
  parameter LINE2_8=8'h1F;  
  parameter LINE2_9=8'h20;  
  parameter LINE2_A=8'h21;  
  parameter LINE2_B=8'h22;  
  parameter LINE2_C=8'h23;  
  parameter LINE2_D=8'h24;  
  parameter LINE2_E=8'h25;  
  parameter LINE2_F=8'h26; 
  
  //------------------------------------------------// 
  reg[7:0] state; 
  reg[7:0] next_state; 
      
 always @ (posedge sysclk or negedge rst_n) 
 begin 
    if(!rst_n ) 
state<=IDLE; 
else if(state_flag) 
state<=next_state; 
 end

  always @ (*) 
  begin 
    case(state) //display line1; 
    IDLE : next_state=INI_SET; 
    INI_SET : next_state=INI_CLR; 
    INI_CLR : next_state=CURSOR_SET1; 
    CURSOR_SET1 : next_state=CURSOR_SET2; 
    CURSOR_SET2 : next_state=LINE1_ADDER; 
    
    LINE1_ADDER : next_state=LINE1_0; 
    
    LINE1_0 : next_state=LINE1_1; 
    LINE1_1 : next_state=LINE1_2; 
    LINE1_2 : next_state=LINE1_3; 
    LINE1_3 : next_state=LINE1_4; 
    LINE1_4 : next_state=LINE1_5; 
    LINE1_5 : next_state=LINE1_6; 
    LINE1_6 : next_state=LINE1_7; 
    LINE1_7 : next_state=LINE1_8; 
    LINE1_8 : next_state=LINE1_9; 
    LINE1_9 : next_state=LINE1_A; 
    LINE1_A : next_state=LINE1_B; 
    LINE1_B : next_state=LINE1_C; 
    LINE1_C : next_state=LINE1_D; 
    LINE1_D : next_state=LINE1_E; 
    LINE1_E : next_state=LINE1_F; 
    LINE1_F : next_state=LINE2_ADDER; 
    
    //display line2; 
    LINE2_ADDER : next_state=LINE2_0; 
    
    LINE2_0 : next_state=LINE2_1; 
    LINE2_1 : next_state=LINE2_2; 
    LINE2_2 : next_state=LINE2_3; 
    LINE2_3 : next_state=LINE2_4; 
    LINE2_4 : next_state=LINE2_5; 
    LINE2_5 : next_state=LINE2_6; 
    LINE2_6 : next_state=LINE2_7; 
    LINE2_7 : next_state=LINE2_8; 
    LINE2_8 : next_state=LINE2_9; 
    LINE2_9 : next_state=LINE2_A; 
    LINE2_A : next_state=LINE2_B; 
    LINE2_B : next_state=LINE2_C; 
    LINE2_C : next_state=LINE2_D; 
    LINE2_D : next_state=LINE2_E; 
    LINE2_E : next_state=LINE2_F; 
    LINE2_F : next_state=LINE1_ADDER;
     
    default : next_state=IDLE; 
   endcase 
  end 

 always @ (posedge sysclk or negedge rst_n) 
 begin 
  if(!rst_n) 
begin 
lcd_rs   <= 1'b0; 
lcd_data <= 8'hxx; 
end 
  else if(state_flag)
    begin 
    case (next_state) 
     IDLE :  begin
                   lcd_rs <= 1'h0;
                   lcd_data <=8'hxx;  
                   end
                     
     INI_SET : begin
lcd_rs <= 1'h0;
lcd_data <=8'h38;
end  
     INI_CLR : begin
lcd_rs <= 1'h0;
lcd_data <=8'h01;
end
     CURSOR_SET1: begin
lcd_rs <= 1'h0;
lcd_data <=8'h06;
end  
     CURSOR_SET2: begin
lcd_rs <= 1'h0;
lcd_data <=8'h0c;
end 
     // line1 
     LINE1_ADDER: begin
lcd_rs <= 1'h0;
lcd_data <=8'h80;
end   
     LINE1_0 : begin
lcd_rs <= 1'h1;
lcd_data <=row1[127:120]; 
end  
     LINE1_1 : begin
lcd_rs <= 1'h1;
lcd_data <=row1[119:112];  
end 
     LINE1_2 : begin
lcd_rs <= 1'h1;
lcd_data <=row1[111:104];
end   
     LINE1_3 : begin
lcd_rs <= 1'h1;
lcd_data <=row1[103:96];
end  
     LINE1_4 : begin
lcd_rs <= 1'h1;
lcd_data <=row1[95:88]; 
end  
     LINE1_5 : begin
lcd_rs <= 1'h1;
lcd_data <=row1[87:80];
end  
     LINE1_6 : begin
lcd_rs <= 1'h1;
lcd_data <=row1[79:72];
end   
     LINE1_7 : begin 
lcd_rs <= 1'h1;
lcd_data <=row1[71:64]; 
end  
     LINE1_8 : begin 
lcd_rs <= 1'h1;
lcd_data <=row1[63:56]; 
end  
     LINE1_9 : begin
lcd_rs <= 1'h1;
lcd_data <=row1[55:48];
end  
     LINE1_A : begin
lcd_rs <= 1'h1;
lcd_data <=row1[47:40]; 
end   
     LINE1_B : begin 
lcd_rs <= 1'h1;
lcd_data <=row1[39:32]; 
end  
     LINE1_C : begin
lcd_rs <= 1'h1;
lcd_data <=row1[31:24]; 
end  
     LINE1_D : begin
lcd_rs <= 1'h1;
lcd_data <=row1[23:16]; 
end  
     LINE1_E : begin
lcd_rs <= 1'h1;
lcd_data <=row1[15:8]; 
end   
     LINE1_F : begin
lcd_rs <= 1'h1;
lcd_data <=row1[7:0];  
end
     // line2  
     LINE2_ADDER: begin
lcd_rs <=1'h0;
lcd_data <=8'hC0; 
end

LINE2_0 : begin
lcd_rs <= 1'h1;
lcd_data <=row2[127:120]; 
end  
     LINE2_1 : begin
lcd_rs <= 1'h1;
lcd_data <=row2[119:112];  
end 
     LINE2_2 : begin
lcd_rs <= 1'h1;
lcd_data <=row2[111:104];
end   
     LINE2_3 : begin
lcd_rs <= 1'h1;
lcd_data <=row2[103:96];
end  
     LINE2_4 : begin
lcd_rs <= 1'h1;
lcd_data <=row2[95:88]; 
end  
     LINE2_5 : begin
lcd_rs <= 1'h1;
lcd_data <=row2[87:80];
end  
     LINE2_6 : begin
lcd_rs <= 1'h1;
lcd_data <=row2[79:72];
end   
     LINE2_7 : begin 
lcd_rs <= 1'h1;
lcd_data <=row2[71:64]; 
end  
     LINE2_8 : begin 
lcd_rs <= 1'h1;
lcd_data <=row2[63:56]; 
end  
     LINE2_9 : begin
lcd_rs <= 1'h1;
lcd_data <=row2[55:48];
end  
     LINE2_A : begin
lcd_rs <= 1'h1;
lcd_data <=row2[47:40]; 
end   
     LINE2_B : begin 
lcd_rs <= 1'h1;
lcd_data <=row2[39:32]; 
end  
     LINE2_C : begin
lcd_rs <= 1'h1;
lcd_data <=row2[31:24]; 
end  
     LINE2_D : begin
lcd_rs <= 1'h1;
lcd_data <=row2[23:16]; 
end  
     LINE2_E : begin
lcd_rs <= 1'h1;
lcd_data <=row2[15:8]; 
end   
     LINE2_F : begin
lcd_rs <= 1'h1;
lcd_data <=row2[7:0];  
end
  endcase 

  end 
  
 end 
  
endmodule     




module clk_div_25MHz(clk_in , Reset, clk_25Mout);
input clk_in ;
input Reset;
output reg   clk_25Mout;

integer i;
always@(posedge clk_in or negedge Reset) begin
 if (!Reset) begin
    i=0;
    clk_25Mout=0;
   end
 else begin
    i= i+1 ;
    if (i>=2) begin
         clk_25Mout  = ~ clk_25Mout;
        i=0;
       end
    end    
end            
endmodule

//+++++++++++++++++++++++++++++++++++++++++
module clk_div_2sec(clk_in , Reset, clk_out);
input clk_in ;
input Reset;
output reg  clk_out;

integer i;
always@(posedge clk_in or negedge Reset) begin
 if (!Reset) begin
   i=0;
   clk_out=0;
   end
 else begin
    i= i+1 ;
    if (i>=50_000_000) begin
        clk_out  = ~clk_out;
        i=0;
       end
    end    
end            

endmodule


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