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10、“Hello,I'm Anmko！”LCD1602的显示实验。

         LCD1602的显示实验，两行显示，不显示光标，画面不移动；
图片中的两根飞线是给背光用的，三色背光的，PCB封装不对，所以飞线了。。。还有那个电阻，最好还是换了吧，不同芯片的屏的电阻值是不一样的（我直接焊接在了LCD的引脚上）。



源代码：
/*************************************************
* Module Name  : lcd1602_driver    
* Engineer  : Anmko
* Target Device : EP2C8Q208C8
* Tool versions : Quartus II 12.0
* Create Date  : 2012-9-3
* Revision  : v1.0
* Description  :    
**************************************************/
module lcd1602_driver
(
 input    clk,
 input    rst_n,

 output     lcd_en,  // lcd enable
 output  reg   lcd_rs,  // record,statement
 output reg   lcd_rw,
 output reg [7:0] lcd_data

);                 
 parameter  [127:0] line_rom1 = "Hello,I'm Anmko!"; 
 parameter [127:0] line_rom2 = "EEPW---FPGA DIY!";
 //--------------------------------------
 reg [15:0] cnt;
 always @ (posedge clk or negedge rst_n)
 begin
  if(!rst_n)
   cnt <= 0;
  else
   cnt <= cnt + 1'b1; 
 end

 assign lcd_en = cnt[15]; //lcd enable,keep same time; >1000ns
 wire cmd_flag = (cnt == 16'h7FFF) ? 1'b1 : 1'b0; //when lcd_en is steady,write a cmd
                            
 // Gray code : 40 states
 parameter  IDLE  =  8'h00; // IDLE
 // lcd init
 parameter  CLEAR  =  8'h01; //清屏
 parameter SETFUNCTION = 8'h02;
 //工作方式设置 1:8/1:4； 位数据接口：两行/一行； 显示：5x10/5x7点阵。
 parameter SWITCHMODE =  8'h03; 
 //显示状态设置，显示：开/关; 光标：开/关; 闪烁：开/关。
 parameter SETMODE = 8'h04;  
 //输入方式设置，读写数据后RA地址增/减1；画面：动/不动。 
 parameter SHIFT  = 8'h05;
 //光标画面滚动：画面/光标平移一位；左/右平移一位。

// parameter SETCGRAM = 8'h40; //设置CGRAM
// parameter SETDDRAM1 = 8'h81; //设置DDRAM
// parameter SETDDRAM2 = 8'h82; //设置DDRAM
  
 // display 1th line 
 parameter  ROW1_ADDR =  8'h09; 
 parameter  ROW1_0  =  8'h0A;
 parameter  ROW1_1  =  8'h0B;
 parameter  ROW1_2  =  8'h0C;
 parameter  ROW1_3  =  8'h0D;
 parameter  ROW1_4  =  8'h0E;
 parameter  ROW1_5  =  8'h0F;
 parameter  ROW1_6  =  8'h10;
 parameter  ROW1_7  =  8'h11;
 parameter  ROW1_8  = 8'h12;
 parameter  ROW1_9  =  8'h13;
 parameter  ROW1_A  =  8'h14;
 parameter  ROW1_B  =  8'h15;
 parameter  ROW1_C  =  8'h16;
 parameter  ROW1_D  =  8'h17;
 parameter  ROW1_E  =  8'h18;
 parameter  ROW1_F  =  8'h19;
 // display 2th line
 parameter  ROW2_ADDR =  8'h1A; 
 parameter  ROW2_0  =  8'h1B;
 parameter  ROW2_1  =  8'h1C;
 parameter  ROW2_2  =  8'h1D;
 parameter  ROW2_3  =  8'h1E;
 parameter  ROW2_4  =  8'h1F;
 parameter  ROW2_5  =  8'h20;
 parameter  ROW2_6  =  8'h21;
 parameter  ROW2_7  =  8'h22;
 parameter  ROW2_8  =  8'h23;
 parameter  ROW2_9  =  8'h24;
 parameter  ROW2_A  =  8'h25;
 parameter  ROW2_B  =  8'h26;
 parameter  ROW2_C  =  8'h27;
 parameter  ROW2_D  =  8'h28;
 parameter  ROW2_E  =  8'h29;
 parameter  ROW2_F  =  8'h2A;

 //---------------------------------------
 reg [7:0]  state;
 //---------------------------------------
 // FSM: 状态机
 always @ (posedge clk or negedge rst_n)
 begin
  if(!rst_n)
   begin
   lcd_rs <= 0;
   lcd_data <= 8'hXX;
   end
  else if(cmd_flag)
   begin
    // write statement
    case(state)     
     IDLE         :begin
          lcd_rs <= 0; lcd_rw <= 0;
          lcd_data <= 8'hxx;
          state <= CLEAR;
         end
     //lcd init
     CLEAR   :begin
          lcd_rs <= 0; lcd_rw <= 0;
          lcd_data <= 8'b0000_0001;
          state <= SETFUNCTION;
         end        
     SETFUNCTION     :begin
          lcd_rs <= 0; lcd_rw <= 0; //3C
          lcd_data <= 8'b0011_1100;
          state <= SWITCHMODE;
         end    
     SWITCHMODE  :begin
          lcd_rs <= 0; lcd_rw <= 0; //08
          lcd_data <= 8'b0000_1000;
          state <= SETMODE;
         end 
         
     SETMODE   :begin
          lcd_rs <= 0; lcd_rw <= 0; //06
          lcd_data <= 8'b0000_0110;
          state <= SHIFT;
         end     
     SHIFT   :begin
          lcd_rs <= 0; lcd_rw <= 0; //0c
          lcd_data <= 8'b0000_1100;
          state <= ROW1_ADDR;
         end      
     ROW1_ADDR  :begin
          lcd_rs <= 0; lcd_rw <= 0;
          lcd_data <= 8'b1000_0000;
          state <= ROW1_0;
         end    
     ROW1_0   :begin
          lcd_rs <= 1; lcd_rw <= 0;
          lcd_data <= line_rom1[127:120];
          state <= ROW1_1;
         end    
     ROW1_1   :begin
          lcd_rs <= 1; lcd_rw <= 0;
          lcd_data <= line_rom1[119:112];
          state <= ROW1_2;
         end
     ROW1_2   :begin
          lcd_rs <= 1; lcd_rw <= 0;
          lcd_data <= line_rom1[111:104];
          state <= ROW1_3;
         end    
     ROW1_3   :begin
          lcd_rs <= 1; lcd_rw <= 0;
          lcd_data <= line_rom1[103:96];
          state <= ROW1_4;
         end
     ROW1_4   :begin
          lcd_rs <= 1; lcd_rw <= 0;
          lcd_data <= line_rom1[95:88];
          state <= ROW1_5;
         end
     ROW1_5   :begin
          lcd_rs <= 1; lcd_rw <= 0;
          lcd_data <= line_rom1[87:80];
          state <= ROW1_6;
         end
     ROW1_6   :begin
          lcd_rs <= 1; lcd_rw <= 0;
          lcd_data <= line_rom1[79:72];
          state <= ROW1_7;
         end
     ROW1_7   :begin
          lcd_rs <= 1; lcd_rw <= 0;
          lcd_data <= line_rom1[71:64];
          state <= ROW1_8;
         end     
     ROW1_8   :begin
          lcd_rs <= 1; lcd_rw <= 0;
          lcd_data <= line_rom1[63:56];
          state <= ROW1_9;
         end
     ROW1_9   :begin
          lcd_rs <= 1; lcd_rw <= 0;
          lcd_data <= line_rom1[55:48];
          state <= ROW1_A;
         end
     ROW1_A   :begin
          lcd_rs <= 1; lcd_rw <= 0;
          lcd_data <= line_rom1[47:40];
          state <= ROW1_B;
         end
     ROW1_B   :begin
          lcd_rs <= 1; lcd_rw <= 0;
          lcd_data <= line_rom1[39:32];
          state <= ROW1_C;
         end
     ROW1_C   :begin
          lcd_rs <= 1; lcd_rw <= 0;
          lcd_data <= line_rom1[31:24];
          state <= ROW1_D;
         end
     ROW1_D   :begin
          lcd_rs <= 1; lcd_rw <= 0;
          lcd_data <= line_rom1[23:16];
          state <= ROW1_E;
         end
     ROW1_E   :begin
          lcd_rs <= 1; lcd_rw <= 0;
          lcd_data <= line_rom1[15:8];
          state <= ROW1_F;
         end
     ROW1_F   :begin
          lcd_rs <= 1; lcd_rw <= 0;
          lcd_data <= line_rom1[7:0];
          state <= ROW2_ADDR;
         end

     ROW2_ADDR  :begin
          lcd_rs <= 0; lcd_rw <= 0;
          lcd_data <= 8'b1100_0000;
          state <= ROW2_0;
         end 
     ROW2_0   :begin
          lcd_rs <= 1; lcd_rw <= 0;
          lcd_data <= line_rom2[127:120];
          state <= ROW2_1;
         end    
     ROW2_1   :begin
          lcd_rs <= 1; lcd_rw <= 0;
          lcd_data <= line_rom2[119:112];
          state <= ROW2_2;
         end
     ROW2_2   :begin
          lcd_rs <= 1; lcd_rw <= 0;
          lcd_data <= line_rom2[111:104];
          state <= ROW2_3;
         end    
     ROW2_3   :begin
          lcd_rs <= 1; lcd_rw <= 0;
          lcd_data <= line_rom2[103:96];
          state <= ROW2_4;
         end
     ROW2_4   :begin
          lcd_rs <= 1; lcd_rw <= 0;
          lcd_data <= line_rom2[95:88];
          state <= ROW2_5;
         end
     ROW2_5   :begin
          lcd_rs <= 1; lcd_rw <= 0;
          lcd_data <= line_rom2[87:80];
          state <= ROW2_6;
         end
     ROW2_6   :begin
          lcd_rs <= 1; lcd_rw <= 0;
          lcd_data <= line_rom2[79:72];
          state <= ROW2_7;
         end
     ROW2_7   :begin
          lcd_rs <= 1; lcd_rw <= 0;
          lcd_data <= line_rom2[71:64];
          state <= ROW2_8;
         end     
     ROW2_8   :begin
          lcd_rs <= 1; lcd_rw <= 0;
          lcd_data <= line_rom2[63:56];
          state <= ROW2_9;
         end
     ROW2_9   :begin
          lcd_rs <= 1; lcd_rw <= 0;
          lcd_data <= line_rom2[55:48];
          state <= ROW2_A;
         end
     ROW2_A   :begin
          lcd_rs <= 1; lcd_rw <= 0;
          lcd_data <= line_rom2[47:40];
          state <= ROW2_B;
         end
     ROW2_B   :begin
          lcd_rs <= 1; lcd_rw <= 0;
          lcd_data <= line_rom2[39:32];
          state <= ROW2_C;
         end
     ROW2_C   :begin
          lcd_rs <= 1; lcd_rw <= 0;
          lcd_data <= line_rom2[31:24];
          state <= ROW2_D;
         end
     ROW2_D   :begin
          lcd_rs <= 1; lcd_rw <= 0;
          lcd_data <= line_rom2[23:16];
          state <= ROW2_E;
         end
     ROW2_E   :begin
          lcd_rs <= 1; lcd_rw <= 0;
          lcd_data <= line_rom2[15:8];
          state <= ROW2_F;
         end
     ROW2_F   :begin
          lcd_rs <= 1; lcd_rw <= 0;
          lcd_data <= line_rom2[7:0];
          state <= ROW1_ADDR;
         end
     default      :  state <= IDLE;
    endcase
   end
 end

endmodule

今天下午调试了一天的12864，可惜木有任何反应，LCD没试过，不知道是LCD的问题还程序的问题，先放一边吧，做做其他的

11、LCD1602的数字时钟显示

       LCD时钟显示。LCD1602显示时、分、秒，按键S1、S2分别对小时进行加、减；S3、S4分别对分进行加10、加1；S5、S6分别对秒进行加10、加1；S8是复位键。

       纯逻辑控制LCD1602的变量显示还是挺麻烦的，变量少的话还能凑合（本实验显示6个变量），一多的话估计很麻烦。。。为了简便实用的应用1602，看来还有一段的路要走啊。。。









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