1602显示.v

单片机1602液晶自习写的 需要的可以看一下

//那位帮我看看这个程序:1602 LCD显示，编译无错，总是什么都不能显示 xiexie  ge wei le :

module lcd1602(clk,rst,lcd_rs,clklcd,lcd_rw,data,en);

input clk,rst;
output lcd_rs,lcd_rw,clklcd,en;
output[7:0] data;
reg lcd_rs,lcd_rw,en;
reg[5:0] address;
wire clk_16;
reg[3:0] count;
reg[15:0] clkcnt;
reg tc_clkcnt;
reg clklcd;
reg clkint;
reg [10:0] state;
reg[6:0] counter;
reg[7:0] data,datas;
reg flag;
reg[3:0] counter1;
parameter
IDLE1=11'b00000000000,
CLEAR=11'b00000000001,
RETURNCURSOR=11'b00000000010, 
SETMODE=11'b00000000100,     
SWITCHMODE=11'b00000001000,   
SHIFT=11'b00000010000,     
SETFUNCTION=11'b00000100000, 
SETCGRAM=11'b00001000000,   
SETDDRAM=11'b00010000000,   
READFLAG=11'b00100000000,   
WRITERAM=11'b01000000000,   
READRAM =11'b10000000000;   
always @(posedge clk or negedge rst)
begin
if (!rst)
  count <= 'b0;
else
  count <= count +1; 
end

assign clk_16 = count[3];
always @(posedge clk_16 or negedge rst)
begin
if(!rst)
begin
clkcnt<=16'b0000000000000000;
tc_clkcnt<=0;
end
  else
  if(clkcnt==16'b1001110001000000)
    begin
  clkcnt<=16'b0000000000000000;
  tc_clkcnt<=~tc_clkcnt;
    end
  else
  clkcnt<=clkcnt+1;
end   
always @(posedge tc_clkcnt or negedge rst)
begin 
if(!rst)
  clkint<=0;
else
  clkint<=~clkint;
end
always @(negedge tc_clkcnt or negedge rst)
begin
if(!rst)
  clklcd<=0;
else
clklcd<=~clklcd;
end               ///前面分频产生所需的时钟信号
always @(posedge clkint or negedge rst)
begin
    if(!rst)
      begin 
          state<=IDLE1;
          counter<=0;
          counter1<=0;
          flag<=0;
      end 
    else
begin
          case (state)
      IDLE1 :
        begin
          if(flag==0) //判断显示是否结束，第一次就开始显示，否则调到shift执行移位命令
            begin
            state<=SETFUNCTION;
              counter<=0;
              flag<=1;
              counter1<=0;
              end
            else if(counter1<4'b1111)
              begin
              counter1<=counter1+1;
              state<=IDLE1;
              end
              else
           begin
            state<=SHIFT;
          counter1<=0;
          end
       
          end   
    CLEAR   : state<=SETMODE; //状态转移
    SETMODE : state<=WRITERAM;
    RETURNCURSOR :   state<=WRITERAM;
    SWITCHMODE :     state<=CLEAR;
      SHIFT   :     state<=IDLE1;
      SETFUNCTION :   state<=SWITCHMODE;
      SETCGRAM   :     state<=IDLE1;
      SETDDRAM   :     state<=WRITERAM;
      READFLAG   :   state<=IDLE1;
      WRITERAM   :   
              begin
                  if(counter<=11 )//第一行显示11个字符
                    begin
                          state<=WRITERAM;
                            counter<=counter+1;
                              end
                        else if(counter<=25)
                              begin 
                              if(counter==12)//设置第2行地址
                                begin
                                state<=SETDDRAM;
                                counter<=counter+1;
                                end 
                              else
                                begin
                                counter<=counter+1;
                                state<=WRITERAM;
                              end
                              end
                           
                           else
                            state<=SHIFT;
                       
              end
      READRAM : state<=IDLE1;
    default : state<=IDLE1;
      endcase
  end

end

always@(address) //选出需要显示的字符
begin
case (address)
  6'b000000: datas<=8'd72;//显示H
    6'b000001: datas<=8'd79;
    6'b000010: datas<=8'd87;
    6'b000011: datas<=8'd32;
    6'b000100: datas<=8'd65;
    6'b000101: datas<=8'd82;
    6'b000110: datas<=8'd69;
    6'b000111: datas<=8'd32;
    6'b001000: datas<=8'd89;
    6'b001001: datas<=8'd79;
    6'b001010: datas<=8'd85;
    6'b001011: datas<=8'd32;
    6'b001100: datas<=8'd32;
   
    6'b001101: datas<=8'd70;
    6'b001110: datas<=8'd73;
    6'b001111: datas<=8'd78;
    6'b010000: datas<=8'd69;
    6'b010001: datas<=8'd32;
    6'b010010: datas<=8'd84;
    6'b010011: datas<=8'd72;
    6'b010100: datas<=8'd65;
    6'b010101: datas<=8'd78;
    6'b010110: datas<=8'd75;
    6'b010111: datas<=8'd83;
    default :   datas<=8'd32;
endcase
end
always
begin 
lcd_rs<=((state ==WRITERAM) | (state == READRAM))? 1: 0;
lcd_rw<=((state ==READFLAG) | (state == READRAM)| (state == IDLE1))? 1: 0;
en<=1;
if(state==WRITERAM)
address<=counter;
else
address<=0;
case(state)
CLEAR:     data <=8'b00000001;
RETURNCURSOR:data <=8'b00000010;
SETMODE:data <=8'b00000110;
SWITCHMODE:data <=8'b00001111;
SHIFT :data <=8'b00011000;
SETFUNCTION:data <=8'b00111100;
SETCGRAM:data <=8'b01000000;
SETDDRAM :
begin
if(counter==0)//判断显示字符的地址，开始默认的是00，如果需要在第2行显示，就在data输出11000000，由于显示一个字符后自动加1，所以它会在第2行继续显示。
data <=8'b10000000;
else data<=8'b11000000;
end
WRITERAM:
data <=datas;
default data <=8'bZZZZZZZZ;//输出要z状态，否则可能出错
endcase
end
endmodule