终于要把LCD12864篇显示汉字的作业交了，源代码如下：
`timescale 1ns / 1ps
//////////////////////////////////////////////////////////////////////////////////
// Company:
// Engineer: Charles Wang
//
// Create Date: 07/20/2014
// Design Name: lcd12864
// Module Name: lcd12864
// Project Name: lcd12864
// Target Devices: EP4CE6E22C8
// Tool versions: Quartus II 13.1 & Modelsim 10.0c SE
// Description: 用LCD12864 显示汉字
//
// Dependencies:
//
// Revision:
// Revision 0.01 - File Created
// Additional Comments:
//
//////////////////////////////////////////////////////////////////////////////////
module lcd12864_ch(clk,rst_n,lcd12864_en,lcd12864_rs,lcd12864_rw,lcd12864_data);
input clk;//50Mhz 总线时钟
input rst_n;//异步复位,低电平有效
output lcd12864_en;//LCD12864 使能端
output lcd12864_rs;//LCD12864 片选,低电平指令,高电平数据
output lcd12864_rw;//读写信号输出端,这里只有写的动作,电平一直为0
output [7:0]lcd12864_data;//8位数据端口
//寄存器及wire 定义
reg lcd12864_rs;
reg [7:0]lcd12864_data;
reg [22:0]div_cnt;
reg [8:0]state;
reg [5:0] word_cnt;
reg [7:0]showdata;
wire lcd12864_en;
wire div_clk;
//////////////////////////////////////////////////////////////////////////////////
///////////////////////////////50Mhz → 1Hz///////////////////////////////////////
always@(posedge clk or negedge rst_n)//50Mhz → 1Hz
begin
if(!rst_n)
div_cnt <= 23'd0;
else
div_cnt <= div_cnt + 1'b1;
end
assign div_clk = (div_cnt == 23'd4999999);
/////////////////////////////////////////////////////////////////////////////////
///////////////////////////////状态机定义/////////////////////////////////////////
parameter idle = 9'b0_0000_0001,
setbase_h = 9'b0_0000_0010,
setbase_l = 9'b0_0000_0100,
setdisp = 9'b0_0000_1000,
clear = 9'b0_0001_0000,
setmode = 9'b0_0010_0000,
wr_addr = 9'b0_0100_0000,
wr_data = 9'b0_1000_0000,
stop_here = 9'b1_0000_0000;
assign lcd12864_rw = 1'b0;
assign lcd12864_en =div_clk;
////////////////////////////////////////////////////////////////////////////////
///////////////////////////////状态转移描述//////////////////////////////////////
always@(posedge div_clk or negedge rst_n )
begin
if(!rst_n)
lcd12864_rs <= 1'b0;
else if(state == wr_data)
lcd12864_rs <= 1'b1;
else
lcd12864_rs <= 1'b0;
end
always@(posedge div_clk or negedge rst_n)
begin
if(!rst_n)
begin
word_cnt <= 6'd0;
lcd12864_data <= 8'hzz;//lcd12864_data 默认高阻
state <= idle;
end
else
begin
case(state)
idle:
begin
lcd12864_data <= 8'hzz;
state <= setbase_h;
end
///////////////////////////////设定8bit MPU 接口,基本指令集///////////////////////////
setbase_h:
begin
state <= setbase_l;
lcd12864_data <= 8'h30;
end
setbase_l:
begin
state <= setdisp;
lcd12864_data <= 8'h30;
end
//////////////////////////////显示开关设置//////////////////////////////////////////
setdisp:
begin
state <= clear;
lcd12864_data <= 8'h0c;
end
//////////////////////////////////清屏////////////////////////////////////////////
clear:
begin
state <= setmode;
lcd12864_data <= 8'h01;
end
/////////////设置设定点,游标右移,DDRAM 地址计数器（AC）加 1///////////////////////////
setmode:
begin
state <= wr_addr;
lcd12864_data <= 8'h06;
end
///////////////////////////////写汉字数据到LCD////////////////////////////////////
wr_addr:
begin
state <= wr_data;
if(word_cnt == 6'd0)
lcd12864_data <= 8'h80;//第一行
else if(word_cnt == 6'd16)
lcd12864_data <= 8'h90;//第二行
else if(word_cnt == 6'd28)
lcd12864_data <= 8'h88;//第三行
else if(word_cnt == 6'd44)
lcd12864_data <= 8'h98;//第四行
end
wr_data:
begin
if(word_cnt >= 6'd0 && word_cnt <= 6'd15)
begin
word_cnt <= word_cnt + 1'b1;
lcd12864_data <= showdata;
if(word_cnt == 6'd15)
state <= wr_addr;
else
state <= wr_data;
end
else if(word_cnt >= 6'd16 && word_cnt <= 6'd27)
begin
word_cnt <= word_cnt + 1'b1;
lcd12864_data <= showdata;
if(word_cnt == 6'd27)
state <= wr_addr;
else
state <= wr_data;
end
else if(word_cnt >=6'd28 && word_cnt <= 6'd43)
begin
word_cnt <= word_cnt + 1'b1;
lcd12864_data <= showdata;
if(word_cnt == 6'd43)
state <= wr_addr;
else
state <= wr_data;
end
else if(word_cnt >=6'd44 && word_cnt <= 6'd57)
begin
word_cnt <= word_cnt + 1'b1;
lcd12864_data <= showdata;
if(word_cnt == 6'd57)
begin
state <= stop_here;
word_cnt<= 6'd0;
end
else
begin
state <= wr_data;
word_cnt<= word_cnt + 1'b1;
end
end
end
stop_here:
begin
state <= stop_here;
end
default:
state <= idle;
endcase
end
end
always@(word_cnt)
begin
case(word_cnt)
6'd0: showdata <= 8'hC8;
6'd1: showdata <= 8'hE7;//"如"
6'd2: showdata <= 8'hB9;
6'd3: showdata <= 8'hFB;//"果"
6'd4: showdata <= 8'hC4;
6'd5: showdata <= 8'hE3;//"你"
6'd6: showdata <= 8'hCF;
6'd7: showdata <= 8'hEB;//"想"
6'd8: showdata <= 8'hD3;
6'd9: showdata <= 8'hB5;//"拥"
6'd10: showdata <= 8'hD3;
6'd11: showdata <= 8'hD0;//"有"
6'd12: showdata <= 8'hC4;
6'd13: showdata <= 8'hE3;//"你"
6'd14: showdata <= 8'hB4;
6'd15: showdata <= 8'hD3;//"从"
6'd16: showdata <= 8'hCE;
6'd17: showdata <= 8'hB4;//"未"
6'd18: showdata <= 8'hD3;
6'd19: showdata <= 8'hD0;//"有"
6'd20: showdata <= 8'hB9;
6'd21: showdata <= 8'hFD;//"过"
6'd22: showdata <= 8'hB5;
6'd23: showdata <= 8'hC4;//"的"
6'd24: showdata <= 8'hB6;
6'd25: showdata <= 8'hAB;//"东"
6'd26: showdata <= 8'hCE;
6'd27: showdata <= 8'hF7;//"西"
6'd28: showdata <= 8'hC4;
6'd29: showdata <= 8'hC7;//"那"
6'd30: showdata <= 8'hC3;
6'd31: showdata <= 8'hB4;//"么"
6'd32: showdata <= 8'hC4;
6'd33: showdata <= 8'hE3;//"你"
6'd34: showdata <= 8'hB1;
6'd35: showdata <= 8'hD8;//"必"
6'd36: showdata <= 8'hD0;
6'd37: showdata <= 8'hEB;//"须"
6'd38: showdata <= 8'hC8;
6'd39: showdata <= 8'hA5;//"去"
6'd40: showdata <= 8'hD7;
6'd41: showdata <= 8'hF6;//"做"
6'd42: showdata <= 8'hC4;
6'd43: showdata <= 8'hE3;//"你"
6'd44: showdata <= 8'hB4;
6'd45: showdata <= 8'hD3;//"从"
6'd46: showdata <= 8'hCE;
6'd47: showdata <= 8'hB4;//"未"
6'd48: showdata <= 8'hD7;
6'd49: showdata <= 8'hF6;//"做"
6'd50: showdata <= 8'hB9;
6'd51: showdata <= 8'hFD;//"过"
6'd52: showdata <= 8'hB5;
6'd53: showdata <= 8'hC4;//"的"
6'd54: showdata <= 8'hCA;
6'd55: showdata <= 8'hC2;//"事"
6'd56: showdata <= 8'hC7;
6'd57: showdata <= 8'hE9;//"情"
default: showdata <= 8'hzz;
endcase
end
endmodule
testbench 代码如下：
`timescale 1ns / 1ps ////////////////////////////////////////////////////////////////////////////////// // Company: // Engineer: Charles Wang // // Create Date: 07/22/2014 // Design Name: lcd12864_tb // Module Name: lcd12864_tb // Project Name: lcd12864_tb // Target Devices: EP4CE6E22C8 // Tool versions: Quartus II 13.1 & Modelsim 10.0C SE // Description: ?LCD12864 ????????? // // Dependencies: // // Revision: // Revision 0.01 - File Created // Additional Comments: // ////////////////////////////////////////////////////////////////////////////////// module lcd12864_tb(); reg clk; reg rst_n; wire lcd12864_en; wire lcd12864_rw; wire lcd12864_rs; wire [7:0]lcd12864_data; ////////////////////////////////////////////////////////////////////////////////// lcd12864_ch LCD(.clk(clk),.rst_n(rst_n),.lcd12864_en(lcd12864_en), .lcd12864_rw(lcd12864_rw),.lcd12864_rs(lcd12864_rs),.lcd12864_data(lcd12864_data)); initial begin clk = 1'b0; rst_n = 1'b0; #20 rst_n = 1'b1; #10 forever #10 clk = ~clk; end endmodule
效果如下：
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