显示字符驱动
1.用字符取模软件取模
00000000;
00000000;
00000000;
00000000;
00000000;
00000000;
00000000;
00000000;
00000000;
00000000;
00000000;
0003C000;
0003C000;
0003C000;
0007E000;
0007E000;
0006E000;
0006E000;
000CF000;
000CF000;
000C7000;
000C7000;
00187800;
00187800;
00187800;
00183800;
00303C00;
00303C00;
00303C00;
00301C00;
00601E00;
00601E00;
00601E00;
00600E00;
00E00E00;
00C00F00;
00C00F00;
00FFFF00;
01FFFF00;
01800780;
01800780;
01800780;
03800780;
030003C0;
030003C0;
030003C0;
070003C0;
060001E0;
060001E0;
060001E0;
0E0001E0;
0E0001F0;
1F0001F8;
7FC00FFE;
7FC00FFE;
00000000;
00000000;
00000000;
00000000;
00000000;
00000000;
00000000;
00000000;
00000000;/*"A",0*/
调用rom
ROM是只读存储器（Read-Only Memory）的简称，是一种只能读出事先所存数据的固态半导体存储器。其特性是一旦储存资料就无法再将之改变或删除。通常用在不需经常变更资料的电子或电脑系统中，并且资料不会因为电源关闭而消失。
rom初始化文档创建
新建文本文件在前面写上：
MEMORY_INITIALIZATION_RADIX=16;（进制）
MEMORY_INITIALIZATION_VECTOR=
把文件格式调成 .coe
调用rom的IP核
在配置的第四页加载rom的初始化文件（具体配置不多说明）
上代码吧
top.v
module top(ext_clk_25m,ext_rst_n,lcd_light_en,lcd_clk,lcd_hsy,lcd_vsy,lcd_r,lcd_g,lcd_b
);
input ext_clk_25m;
input ext_rst_n;
output lcd_light_en;
output lcd_clk;
output lcd_hsy;
output lcd_vsy;
output [4:0] lcd_r;
output [5:0] lcd_g;
output [4:0] lcd_b;
wire [31:0] rom_db;
wire [5:0] rom_ab;
lcd_controller uut_lcd_controller(
.clk(ext_clk_25m),
.rst_n(ext_rst_n),
.lcd_light_en(lcd_light_en),
.lcd_clk(lcd_clk),
.lcd_hsy(lcd_hsy),
.lcd_vsy(lcd_vsy),
.lcd_r(lcd_r),
.lcd_g(lcd_g),
.lcd_b(lcd_b),
.rom_db(rom_db),
.rom_ab(rom_ab)
);
rom_controller uut_rom_controller (
.clka(ext_clk_25m), // input clka
.addra(rom_ab), // input [5 : 0] addra
.douta(rom_db) // output [31 : 0] douta
);
endmodulelcd_controller.v
module lcd_controller(clk,rst_n,lcd_light_en,lcd_clk,lcd_hsy,lcd_vsy,lcd_r,lcd_g,lcd_b,rom_db,rom_ab
);
input clk;
input rst_n;
input [31:0] rom_db;
output [5:0]rom_ab;
output lcd_light_en;
output lcd_clk;
output reg lcd_hsy;
output reg lcd_vsy;
output [4:0] lcd_r;
output [5:0] lcd_g;
output [4:0] lcd_b;
parameter HSY_TH=9'D408-1'D1;//周期
parameter HSY_THS=9'D30 ;//脉冲宽度
parameter HSY_THB=9'D38 ;//后沿
parameter HSY_TEP=9'D320 ;//显示周期
parameter HSY_THE=9'D68 ;//同步周期
parameter HSY_THF=9'D20 ;//前沿
parameter VSY_TV=9'D262-1'D1;//周期
parameter VSY_TVS=9'D3 ;//脉冲宽度
parameter VSY_TVB=9'D15 ;//后沿
parameter VSY_TVD=9'D240 ;//显示周期
parameter VSY_TVF=9'D4 ;//前沿
//lcd背光常开
assign lcd_light_en=1'b1;
//配置驱动时钟6.25mHz
reg [1:0] lcd_cnt;
always@(posedge clk or negedge rst_n)begin
if(rst_n==1'b0)begin
lcd_cnt<=1'b0;
end
else begin
lcd_cnt<=lcd_cnt+1'b1;
end
end
assign lcd_clk=lcd_cnt[1];
wire dchange ={lcd_cnt==2'd2};
//X和Y轴计数器
reg[8:0] xcnt;
reg[8:0] ycnt;
always@(posedge clk or negedge rst_n)begin
if(rst_n==1'b0)begin
xcnt<=1'b0;
end
else if(dchange==1'b1)begin
if(xcnt==HSY_TH)begin
xcnt<=1'b0;
end
else begin
xcnt<=xcnt+1'b1;
end
end
else;
end
always@(posedge clk or negedge rst_n)begin
if(rst_n==1'b0)begin
ycnt<=1'b0;
end
else if(dchange&&xcnt==HSY_TH)begin
if(ycnt==VSY_TV)begin
ycnt<=1'b0;
end
else begin
ycnt<=ycnt+1'b1;
end
end
else begin
ycnt<=ycnt;
end
end
//lcd显示的有效区域
reg valid;
always@(posedge clk or negedge rst_n)begin
if(rst_n==1'b0)begin
valid<=1'b0;
end
else if(ycnt>=(VSY_TVS+VSY_TVB)&&ycnt<(VSY_TVS+VSY_TVB+VSY_TVD)&&
xcnt>=(HSY_THS+HSY_THB)&&xcnt<(HSY_TEP+HSY_THB+HSY_THE))begin
valid<=1'b1;
end
else begin
valid<=1'b0;
end
end
//LCD驱动行场同步信号产生逻辑
always@(posedge clk or negedge rst_n)begin
if(rst_n==1'b0)begin
lcd_hsy<=1'b1;
end
else if(xcnt==1'b0)begin
lcd_hsy<=1'b0;
end
else if(xcnt>=HSY_THS)begin
lcd_hsy<=1'b1;
end
else begin
lcd_hsy<=lcd_hsy;
end
end
always@(posedge clk or negedge rst_n)begin
if(rst_n==1'b0)begin
lcd_vsy<=1'b1;
end
else if(ycnt==1'b0)begin
lcd_vsy<=1'b0;
end
else if(ycnt>=VSY_TVS)begin
lcd_vsy<=1'b1;
end
else begin
lcd_vsy<=lcd_vsy;
end
end
assign rom_ab = ycnt-9'd18;
reg [4:0]tmp_cnt;
always@(posedge clk or negedge rst_n)begin
if(rst_n==1'b0)begin
tmp_cnt<=1'b0;
end
else if(valid==1'b0)begin
tmp_cnt<=1'b0;
end
else if(xcnt>=(HSY_THS+HSY_THB)&&xcnt<(HSY_THS+HSY_THB+6'd32)&&dchange)begin
tmp_cnt<=tmp_cnt+1'b1;
end
end
reg [15:0]lcd_db_rgb;
always@(posedge clk or negedge rst_n)begin
if(rst_n==1'b0)begin
lcd_db_rgb<=16'd0;
end
else if(ycnt>=(VSY_TVS+VSY_TVB)&&ycnt<(VSY_TVS+VSY_TVB+9'd64)
&&xcnt>=(HSY_THS+HSY_THB)&&xcnt<(HSY_THS+HSY_THB+6'd32))begin
if(dchange)begin //数字区域
if(rom_db[tmp_cnt]==1'b1)begin
lcd_db_rgb<=16'h001f;
end
else begin
lcd_db_rgb<=16'hf800;
end
end
else;
end
else begin
lcd_db_rgb<=1'b0;
end
end
assign lcd_r =valid ? lcd_db_rgb[15:11]:5'd0;
assign lcd_g =valid ? lcd_db_rgb[10:5]:6'd0;
assign lcd_b =valid ? lcd_db_rgb[4:0]:5'd0;
endmodule实验结果：（这里拍照的时候调了相机的亮度）
