LCD1602控制器Verilog
LCD1602的控制器模块和主模块
LCD1602的时序和控制寄存器命令见http://www.cnblogs.com/qiweiwang/archive/2010/12/16/1908608.html
LCD1602的控制模块：
1 module LCD_Controller ( // Host Side
2 iDATA,iRS,
3 iStart,oDone,
4 iCLK,iRST_N,
5 // LCD Interface
6 LCD_DATA,
7 LCD_RW,
8 LCD_EN,
9 LCD_RS );
10 // CLK
11 parameter CLK_Divide = 16;
12
13 // Host Side
14 input [7:0] iDATA;
15 input iRS,iStart;
16 input iCLK,iRST_N;
17 output reg oDone;
18 // LCD Interface
19 output [7:0] LCD_DATA;
20 output reg LCD_EN;
21 output LCD_RW;
22 output LCD_RS;
23 // Internal Register
24 reg [4:0] Cont;
25 reg [1:0] ST;
26 reg preStart,mStart;
27
28 /////////////////////////////////////////////
29 // Only write to LCD, bypass iRS to LCD_RS
30 assign LCD_DATA = iDATA;
31 assign LCD_RW = 1\'b0;
32 assign LCD_RS = iRS;
33 /////////////////////////////////////////////
34
35 always@(posedge iCLK or negedge iRST_N)
36 begin
37 if(!iRST_N)
38 begin
39 oDone <= 1\'b0;
40 LCD_EN <= 1\'b0;
41 preStart<= 1\'b0;
42 mStart <= 1\'b0;
43 Cont <= 0;
44 ST <= 0;
45 end
46 else
47 begin
48 ////// Input Start Detect ///////
49 preStart<= iStart;
50 if({preStart,iStart}==2\'b01)
51 begin
52 mStart <= 1\'b1;
53 oDone <= 1\'b0;
54 end
55 //////////////////////////////////
56 if(mStart)
57 begin
58 case(ST)
59 0: ST <= 1; // Wait Setup
60 1: begin
61 LCD_EN <= 1\'b1;
62 ST <= 2;
63 end
64 2: begin
65 if(Cont<CLK_Divide)
66 Cont <= Cont+1\'b1;
67 else
68 ST <= 3;
69 end
70 3: begin
71 LCD_EN <= 1\'b0;
72 mStart <= 1\'b0;
73 oDone <= 1\'b1;
74 Cont <= 0;
75 ST <= 0;
76 end
77 endcase
78 end
79 end
80 end
81
82 endmodule
主模块
// 9\'h120 @ 9\'h140 ` 9\'h160
// ! 9\'h121 A 9\'h141 a 9\'h161
// " 9\'h122 B 9\'h142 b 9\'h162
// # 9\'h123 C 9\'h143 c 9\'h163
// $ 9\'h124 D 9\'h144 d 9\'h164
// % 9\'h125 E 9\'h145 e 9\'h165
// & 9\'h126 F 9\'h146 f 9\'h166
// \' 9\'h127 G 9\'h147 g 9\'h167
// ( 9\'h128 H 9\'h148 h 9\'h168
// ) 9\'h129 I 9\'h149 i 9\'h169
// * 9\'h12A J 9\'h14A j 9\'h16A
// + 9\'h12B K 9\'h14B k 9\'h16B
// , 9\'h12C L 9\'h14C l 9\'h16C
// - 9\'h12D M 9\'h14D m 9\'h16D
// . 9\'h12E N 9\'h14E n 9\'h16E
// / 9\'h12F O 9\'h14F o 9\'h16F
// 0 9\'h130 P 9\'h150 p 9\'h170
// 1 9\'h131 Q 9\'h151 q 9\'h171
// 2 9\'h132 R 9\'h152 r 9\'h172
// 3 9\'h133 S 9\'h153 s 9\'h173
// 4 9\'h134 T 9\'h154 t 9\'h174
// 5 9\'h135 U 9\'h155 u 9\'h175
// 6 9\'h136 V 9\'h156 v 9\'h176
// 7 9\'h137 W 9\'h157 w 9\'h177
// 8 9\'h138 X 9\'h158 x 9\'h178
// 9 9\'h139 Y 9\'h159 y 9\'h179
// : 9\'h13A Z 9\'h15A z 9\'h17A
// ; 9\'h13B [ 9\'h15B { 9\'h17B
// < 9\'h13C ￥ 9\'h15C | 9\'h17C
// = 9\'h13D ] 9\'h15D } 9\'h17D
// > 9\'h13E ^ 9\'h15E → 9\'h17E
// ? 9\'h13F _ 9\'h15F ← 9\'h17F
module LCD ( // Host Side
iCLK,iRST_N,
mLCD_DATA,mLCD_RS,mLCD_Start,mLCD_Done,
data);
// Host Side
input iCLK,iRST_N,mLCD_Done;
input [23:0] data;
output reg mLCD_Start;
output reg [7:0] mLCD_DATA;
output reg mLCD_RS;
// Internal Wires/Registers
reg [5:0] LUT_INDEX;
reg [8:0] LUT_DATA;
reg [5:0] mLCD_ST;
reg [17:0] mDLY;
parameter LCD_INTIAL = 0;
parameter LCD_LINE1 = 5;
parameter LCD_CH_LINE = LCD_LINE1+16;//21
parameter LCD_LINE2 = LCD_LINE1+16+1;//22
parameter LUT_SIZE = LCD_LINE1+32+1;//38
always@(posedge iCLK or negedge iRST_N)
begin
if(!iRST_N)
begin
LUT_INDEX <= 0;
mLCD_ST <= 0;
mDLY <= 0;
mLCD_Start <= 0;
mLCD_DATA <= 0;
mLCD_RS <= 0;
end
else
begin
if(LUT_INDEX<LUT_SIZE)
begin
case(mLCD_ST)
0: begin
mLCD_DATA <= LUT_DATA[7:0];
mLCD_RS <= LUT_DATA[8];
mLCD_Start <= 1;
mLCD_ST <= 1;
end
1: begin
if(mLCD_Done)
begin
mLCD_Start <= 0;
mLCD_ST <= 2;
end
end
2: begin
if(mDLY<18\'h3FFFE)
mDLY <= mDLY+1\'b1;
else
begin
mDLY <= 0;
mLCD_ST <= 3;
end
end
3: begin
LUT_INDEX <= LUT_INDEX+1\'b1;
mLCD_ST <= 0;
end
endcase
end
else
begin
mLCD_ST <= 0;
LUT_INDEX <=LCD_INTIAL+3;
end
end
end
always @ (*)
begin
case(LUT_INDEX)
// Initial
LCD_INTIAL+0: LUT_DATA <= 9\'h038;//显示模式设置
LCD_INTIAL+1: LUT_DATA <= 9\'h00C;//显示状态开关设置
LCD_INTIAL+2: LUT_DATA <= 9\'h001;//清屏
LCD_INTIAL+3: LUT_DATA <= 9\'h006;//显示光标移动设置
LCD_INTIAL+4: LUT_DATA <= 9\'h080;//置数据存贮器地址
// Line 1
LCD_LINE1+0: LUT_DATA <= 9\'h120; //
LCD_LINE1+1: LUT_DATA <= 9\'h120;
LCD_LINE1+2: LUT_DATA <= {5\'b10011,data[23:20]};
LCD_LINE1+3: LUT_DATA <= {5\'b10011,data[19:16]};
LCD_LINE1+4: LUT_DATA <= 9\'h13A;
LCD_LINE1+5: LUT_DATA <= {5\'b10011,data[15:12]};
LCD_LINE1+6: LUT_DATA <= {5\'b10011,data[11:8]};
LCD_LINE1+7: LUT_DATA <= 9\'h13A;
LCD_LINE1+8: LUT_DATA <= {5\'b10011,data[7:4]};
LCD_LINE1+9: LUT_DATA <= {5\'b10011,data[3:0]};
LCD_LINE1+10: LUT_DATA <= 9\'h120;
LCD_LINE1+11: LUT_DATA <= 9\'h157;
LCD_LINE1+12: LUT_DATA <= 9\'h141;
LCD_LINE1+13: LUT_DATA <= 9\'h14E;
LCD_LINE1+14: LUT_DATA <= 9\'h147;
LCD_LINE1+15: LUT_DATA <= 9\'h120;
// Change Line
LCD_CH_LINE: LUT_DATA <= 9\'h0C0;
// Line 2
LCD_LINE2+0: LUT_DATA <= 9\'h132; //
LCD_LINE2+1: LUT_DATA <= 9\'h130;
LCD_LINE2+2: LUT_DATA <= 9\'h131;
LCD_LINE2+3: LUT_DATA <= 9\'h130;
LCD_LINE2+4: LUT_DATA <= 9\'h12D;
LCD_LINE2+5: LUT_DATA <= 9\'h131;
LCD_LINE2+6: LUT_DATA <= 9\'h131;
LCD_LINE2+7: LUT_DATA <= 9\'h12D;
LCD_LINE2+8: LUT_DATA <= 9\'h131;
LCD_LINE2+9: LUT_DATA <= 9\'h136;
LCD_LINE2+10: LUT_DATA <= 9\'h120;
LCD_LINE2+11: LUT_DATA <= 9\'h120;
LCD_LINE2+12: LUT_DATA <= 9\'h177;
LCD_LINE2+13: LUT_DATA <= 9\'h165;
LCD_LINE2+14: LUT_DATA <= 9\'h169;
LCD_LINE2+15: LUT_DATA <= 9\'h120;
default: LUT_DATA <= 9\'h000;
endcase
end
endmodule