FPGA LCD1602 顯示程序

• • 代碼片

#這段代碼 是我參考網上的程序修改的代碼，代碼最終實現在LCD1602 上顯示 “小姐姐”字樣， 由于LCD的點陣只能實現5*8，“姐”字我用了兩個字節顯示，以下是代碼。 代碼我自己親自測試過的。

代碼片

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// An highlighted block module lcd_1602(clk_50M,rst,en,RS,RW,data);input clk_50M; input rst; output en; output RS; output RW; output [7:0] data; wire clk_500; clk_50M_500 u_clk50M_500(.clk_50M(clk_50M),.rst(rst),.clk_500(clk_500));lcd_show u_lcd_show(.clk_LCD(clk_500),.rst(rst),.en(en),.RS(RS),.RW(RW),.data(data));endmodule module clk_50M_500(clk_50M,rst,clk_500); input clk_50M; input rst; output clk_500;reg [8:0] cnt_1; reg [7:0] cnt_2; reg clk_500hz;always@(posedge clk_50M) begin if(!rst)begin clk_500hz<=0;cnt_1<=0;cnt_2<=0;endelse if(cnt_2==8'd199)begin cnt_2<=0;if(cnt_1==9'd499)begin cnt_1 <=0;clk_500hz<=~clk_500hz;endelsecnt_1<=cnt_1+1;endelse cnt_2 <=cnt_2+1; endassign clk_500=clk_500hz; endmodulemodule lcd_show(clk_LCD,rst,en,RS,RW,data); input clk_LCD; input rst; output en,RS,RW; output reg [7:0] data; reg RS,en_sel; reg [4:0] disp_count; reg [4:0] write_count; reg [2:0] num; reg [3:0] state;parameter clear_lcd =4'b1000,set_disp_mode =4'b1001,disp_on =4'b1010,shift_down =4'b1011,write_cgram =4'b1100,write_data_first =4'b1101,write_data_second =4'b1110,idel =4'b1111;//此處參數無特別意義，似乎只是狀態機標號assign RW=1'b0; assign en = en_sel?clk_LCD:1'b0;reg [7:0] data_character [7:0]; reg [7:0] data_character2 [7:0]; reg [7:0] data_character3 [7:0]; reg [7:0] data_character4 [7:0];always @(posedge clk_LCD)begin data_character[0] <= 8'h00;data_character[1] <= 8'h04;data_character[2] <= 8'h04;data_character[3] <= 8'h0E;data_character[4] <= 8'h15;data_character[5] <= 8'h04;data_character[6] <= 8'h0C;data_character[7] <= 8'h04;data_character2[0] <= 8'h08;data_character2[1] <= 8'h0A;data_character2[2] <= 8'h1F;data_character2[3] <= 8'h0A;data_character2[4] <= 8'h0E;data_character2[5] <= 8'h04;data_character2[6] <= 8'h0A;data_character2[7] <= 8'h11;data_character3[0] <= 8'h00;data_character3[1] <= 8'h0E;data_character3[2] <= 8'h0A;data_character3[3] <= 8'h0E;data_character3[4] <= 8'h0A;data_character3[5] <= 8'h0E;data_character3[6] <= 8'h0A;data_character3[7] <= 8'h1F;data_character4[0] <= 8'h1F;data_character4[1] <= 8'h01;data_character4[2] <= 8'h01;data_character4[3] <= 8'h01;data_character4[4] <= 8'h1D;data_character4[5] <= 8'h01;data_character4[6] <= 8'h01;data_character4[7] <= 8'h1F;endreg [7:0] data_first_line [15:0]; reg [7:0] data_second_line [15:0]; always @(posedge clk_LCD)begin data_first_line[0] <= 8'h01;//Tdata_first_line[1] <= 8'h6F;//odata_first_line[2] <= 8'h20;// data_first_line[3] <= 8'h6d;//mdata_first_line[4] <= 8'h79;//ydata_first_line[5] <= 8'h20;//data_first_line[6] <= 8'h66;//fdata_first_line[7] <= 8'h72;//rdata_first_line[8] <= 8'h69;//idata_first_line[9] <= 8'h65;//edata_first_line[10] <= 8'h6e;//ndata_first_line[11] <= 8'h64;//ddata_first_line[12] <= 8'h8a;//sdata_first_line[13] <= 8'h8a;//不顯示data_second_line[1] <= 8'h00;//字0data_second_line[2] <= 8'h01;//字2data_second_line[3] <= 8'h02;//字3data_second_line[4] <= 8'h01;//字2data_second_line[5] <= 8'h02;//字3data_second_line[6] <= 8'h03;//字4data_second_line[7] <= 8'h03;//pdata_second_line[8] <= 8'h03;//pdata_second_line[9] <= 8'h8a;//ydata_second_line[10] <= 8'h64;//ydata_second_line[11] <= 8'h64;//yendalways @(posedge clk_LCD or negedge rst)begin if(!rst)begin state <= clear_lcd;RS <= 1'b0;data <= 8'b0;en_sel <= 1'b1;disp_count <= 5'b0;num <= 3'b0;write_count <= 5'b0;endelse case(state)clear_lcd:begin state <=set_disp_mode;data <=8'h01;//清屏代碼endset_disp_mode:begin state <=disp_on;data <=8'h38;enddisp_on:begin state <=shift_down;data <=8'h0c;//顯示開關控制指令endshift_down:begin state <=write_cgram;data <=8'h06;endwrite_cgram:begin case (num)0:begin data <= 8'h40; //num <= num +1;state <= write_cgram;end1:begin if(write_count == 8)begin data <= 8'h48; //RS <= 1'b0;num <= num +1;state <= write_cgram;write_count<=0;endelse begin data <=data_character[write_count];RS <=1'b1;write_count <= write_count+1'b1;state <= write_cgram;endend2:begin if(write_count==8)begin data<=8'h50; //RS <=1'b0;num <= num+1;state <= write_cgram;write_count<=0;endelse begindata<=data_character2[write_count];RS <=1'b1;write_count <=write_count+1'b1;state <=write_cgram;endend3:begin if (write_count==8)begin data<=8'h58; //RS<=1'b0;num <= num+1;state<=write_cgram;write_count<=0;endelse begin data<=data_character3[write_count];RS<=1'b1;write_count <=write_count+1'b1;state <=write_cgram;endend4:begin if (write_count==8)begin data<=8'h80; //RS<=1'b0;state<= write_data_first;write_count<=0;endelse begin data<=data_character4[write_count];RS<=1'b1;write_count <=write_count+1'b1;state <=write_cgram;endendendcaseendwrite_data_first: begin if(disp_count ==14)begin data <= 8'hc2;RS <= 1'b0;disp_count <= 4'b0;state <= write_data_second;endelse begin data <= data_first_line[disp_count];RS <= 1'b1;disp_count <=disp_count+1'b1;state <= write_data_first;endendwrite_data_second:begin if(disp_count==11)begin en_sel <= 1'b0;RS <= 1'b0;disp_count<= 4'b0;state <= idel;endelse begin data <= data_second_line[disp_count+1];RS <= 1'b1;disp_count <= disp_count+1'b1;state <= write_data_second;endendidel:begin state <= idel;enddefault: state <= clear_lcd;endcase end endmodule

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