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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：