[笔记]DE2-115 LCD1602字符的显示

顶层代码:

module lcd1602(
input CLOCK_50,
input RST_N,
inout[7:0] LCD_DATA,
output LCD_EN,
output LCD_RS,
output LCD_RW,
output LCD_ON,
output LCD_BLON
);
//initial//
wire[7:0] LCD_D_1;
wire LCD_RS_1;
wire LCD_RW_1;
wire LCD_EN_1;
wire DLY_RST;

assign LCD_DATA=LCD_D_1;
assign LCD_RS=LCD_RS_1;
assign LCD_RW=LCD_RW_1;
assign LCD_EN=LCD_EN_1;
assign LCD_ON=1'b1;
assign LCD_BLON=1'b0;

Reset_Delay r0(.iCLK(CLOCK_50),	.oRESET(DLY_RST));
LCD1602_TEST u1(	//Host Side
				.iCLK(CLOCK_50),
				.iRST_N(DLY_RST),
				//LCD Side
				.LCD_DATA(LCD_D_1),
				.LCD_RW(LCD_RW_1),
				.LCD_EN(LCD_EN_1),
				.LCD_RS(LCD_RS_1)
			);
endmodule

RST_N初始延迟代码： 

module Reset_Delay(iCLK,oRESET);
input iCLK;
output reg oRESET;
reg[19:0] Cont;

always@(posedge iCLK)
begin
	if(Cont!=20'hfffff)
		begin
			Cont<=Cont+1'b1;
			oRESET<=1'b0;
		end
	else
		oRESET<=1'b1;
end

endmodule

		

 底层代码LCD1602_TEST：

module LCD1602_TEST(
input iCLK,iRST_N,	//Host Side
output[7:0] LCD_DATA,	//LCD1602 Side
output LCD_RS,LCD_RW,LCD_EN
);
//Internal Wires/Registers
reg[5:0] LUT_INDEX;
reg[8:0] LUT_DATA;
reg[5:0] mLCD_ST;
reg[17:0] mDLY;
reg[7:0] mLCD_DATA;
reg	mLCD_Start;
reg	mLCD_RS;
wire mLCD_Done;

parameter LCD_INITIAL	=	0;
parameter LCD_LINE1		=	5;	//Just have 5 control command
parameter LCD_CH_LINE	=	LCD_LINE1+16;	//Change Line
parameter LCD_LINE2		=	LCD_LINE1+16+1;
parameter LUT_SIZE		=	LCD_LINE1+32+1;

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'h3ffff)
							mDLY	<=	mDLY+18'b1;
						else
						begin
							mDLY	<=	0;
							mLCD_ST	<=	3;
						end
					end
				3:	begin
						LUT_INDEX	<=	LUT_INDEX+6'b1;
						mLCD_ST		<=	0;
					end
			endcase
		end
	end
end

always
begin
	case(LUT_INDEX)
	//	Inital
	LCD_INITIAL+0:	LUT_DATA	<=	9'h038;	//设置16x2显示，5x7点阵，8位数据接口
	LCD_INITIAL+1:	LUT_DATA	<=	9'h00C;	//设置开显示，不显示光标
	LCD_INITIAL+2:	LUT_DATA	<=	9'h001;	//显示清零，数据指针清零
	LCD_INITIAL+3:	LUT_DATA	<=	9'h006;	//写一个字符后地址指针加一
	LCD_INITIAL+4:	LUT_DATA	<=	9'h080;	//Line1 First Address
	// 	Line1
	LCD_LINE1+0:	LUT_DATA	<=	9'h120;	//	Welcome to
	LCD_LINE1+1:	LUT_DATA	<=	9'h120;	//
	LCD_LINE1+2:	LUT_DATA	<=	9'h120;	//
	LCD_LINE1+3:	LUT_DATA	<=	9'h157;	//w
	LCD_LINE1+4:	LUT_DATA	<=	9'h165;	//e
	LCD_LINE1+5:	LUT_DATA	<=	9'h16C;	//l
	LCD_LINE1+6:	LUT_DATA	<=	9'h163;	//c
	LCD_LINE1+7:	LUT_DATA	<=	9'h16F;	//o
	LCD_LINE1+8:	LUT_DATA	<=	9'h16D;	//m
	LCD_LINE1+9:	LUT_DATA	<=	9'h165;	//e
	LCD_LINE1+10:	LUT_DATA	<=	9'h120;	//	
	LCD_LINE1+11:	LUT_DATA	<=	9'h174;	//t
	LCD_LINE1+12:	LUT_DATA	<=	9'h16F;	//o
	LCD_LINE1+13:	LUT_DATA	<=	9'h120;	//
	LCD_LINE1+14:	LUT_DATA	<=	9'h120;	//
	LCD_LINE1+15:	LUT_DATA	<=	9'h120;	//
	//	Change Line
	LCD_CH_LINE:	LUT_DATA	<=	9'h0C0;
	//	Line 2
	LCD_LINE2+0:	LUT_DATA	<=	9'h120;	//	www.njodin.com
	LCD_LINE2+1:	LUT_DATA	<=	9'h157;	//w
	LCD_LINE2+2:	LUT_DATA	<=	9'h157;	//w
	LCD_LINE2+3:	LUT_DATA	<=	9'h157;	//w
	LCD_LINE2+4:	LUT_DATA	<=	9'h12E;	//.
	LCD_LINE2+5:	LUT_DATA	<=	9'h16E;	//n
	LCD_LINE2+6:	LUT_DATA	<=	9'h16A;	//j
	LCD_LINE2+7:	LUT_DATA	<=	9'h16F;	//o
	LCD_LINE2+8:	LUT_DATA	<=	9'h164;	//d
	LCD_LINE2+9:	LUT_DATA	<=	9'h169;	//i
	LCD_LINE2+10:	LUT_DATA	<=	9'h16E;	//n
	LCD_LINE2+11:	LUT_DATA	<=	9'h12E;	//.
	LCD_LINE2+12:	LUT_DATA	<=	9'h163;	//c
	LCD_LINE2+13:	LUT_DATA	<=	9'h16F;	//o
	LCD_LINE2+14:	LUT_DATA	<=	9'h16D;	//m
	LCD_LINE2+15:	LUT_DATA	<=	9'h120;	//
	default:		LUT_DATA	<=	9'h120;
	endcase
end
	
LCD1602_Controller	u0	(	//Host Side
							.iDATA(mLCD_DATA),
							.iRS(mLCD_RS),
							.iStart(mLCD_Start),
							.oDone(mLCD_Done),
							.iCLK(iCLK),
							.iRST_N(iRST_N),
							//LCD1602 Interface
							.LCD_DATA(LCD_DATA),
							.LCD_RW(LCD_RW),
							.LCD_EN(LCD_EN),
							.LCD_RS(LCD_RS)
						);
endmodule

底层代码LCD1602_Controller：

module LCD1602_Controller(
//Host Side
input iCLK,iRST_N,
input iRS,iStart,
input[7:0] iDATA,
output reg oDone,
//LCD1602 Interface
output[7:0] LCD_DATA,
output LCD_RS,
output LCD_RW,
output reg LCD_EN
);
//Internal Register
reg[4:0] Cont;
reg[1:0] ST;
reg preStart,mStart;
//Only write to LCD,bypass iRS to LCD_RS
assign LCD_DATA	=	iDATA;
assign LCD_RS	=	iRS;
assign LCD_RW	=	1'b0;

parameter CLK_Divide	=	16;

always@(posedge iCLK or negedge iRST_N)
begin
	if(!iRST_N)
	begin
		oDone	<=	1'b0;
		LCD_EN	<=	1'b0;
		preStart<=	1'b0;
		mStart	<=	1'b0;
		Cont	<=	0;
		ST		<=	0;
	end
	else
	begin	
	//Input Start Detect
	preStart	<=	iStart;
	if({preStart,iStart}==2'b01)
	begin
		mStart	<=	1'b1;
		oDone	<=	1'b0;
	end
	if(mStart)
	begin
		case(ST)
			0:	ST	<=	1;	//Wait Setup
			1:	begin
					LCD_EN	<=	1'b1;
					ST		<=	2;
				end
			2:	begin
					if(Cont<CLK_Divide)
						Cont	<=	Cont+5'b1;
					else
						ST		<=	3;
				end
			3:	begin
					LCD_EN	<=	1'b0;
					mStart	<=	1'b0;
					oDone	<=	1'b1;
					Cont	<=	0;
					ST		<=	0;
				end
		endcase
		end
	end
end

endmodule

效果图：