【红色飓风Nano二代测评】教你如何编写带FIFO的LCD接口
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发表于 4/22/2014 9:05:28 AM
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桓公出品，转载请注明出处http://blog.chinaaet.com/songhuangong
之前写的一些博客，为这篇博客的诞生，打下了基础。
这篇文章，主要贴出完整的代码。所以想详细的了解所有的步骤，
可能需要复习下我之前的博客。
介绍了LCD驱动芯片的寄存器，以及时序。
介绍了FIFO读写需要注意的地方，以及如何在ISE中添加FIFO IP Core
介绍了如何用插补绘制任意斜率的直线。
话说FIFO作为模块之间的沟通工具“真真是极好的！”，桓公何处此言呢？
就拿这个LCD接口为例，它自带一个FIFO，FIFO的读部分为自己所用，FIFO
的写部分作为输入引脚，以供其他模块使用。
对于LCD接口而言，只需关注FIFO是否为空，有数据就读取数据画点。
对于外部控制模块而言，只负责产生数据，写入FIFO即可。这就是所谓
的“低耦合，高内聚”吧，呵呵！但是这还不是重点。重点是模块可以
利用这个缓冲区，腾出时间做其他事情。比如说LCD是需要一个初始化
过程的，而且这个过程的时间还不短，但是在初始化的时候，控制模块
可能已经开始产生数据了，而此时LCD还在初始化，无法画点，不过不要
紧，产生的数据被缓存到FIFO中，当LCD初始化完成了之后，就会自动去
读取FIFO中的数据。也就是说控制模块不用傻傻的等待着LCD完成初始化完
成，再去产生数据。（不然的话控制模块肯定还需要接收一个LCD初始
化的完成信号，这样的话耦合度也就上升了）。
同时这个方法也有需要注意的地方，比如说在LCD初始话的时候，控制
模块产生了10个数据，但是LCD的FIFO大小只有8，那么就会造成2个数据
的丢失。所以，这也需要设计者合理的设置FIFO的大小，以确保FIFO不会
溢出，导致数据的丢失。
先用一张结构图来表明大意：
以下程序就是通过按键模块，产生坐标，将坐标点写入FIFO。（之后会介绍用插补产生坐标）
LCD接口检测到FIFO中有数据，就会数据反映到LCD显示屏。
效果图：
代码结构图：
不要看代码文件似乎很多，其实很多是多次重复例化而来。
比如说按键模块，就是将一路按键，重复例化四次，再封装而成的四路按键模块。
这样做的好处就是方便代码的维护，以及拓展。
好了上完整的代码：
1、TOP_Control：总顶层文件，链接TFT_Interface和key_control
module TOP_Control ( input CLK, input RSTn, input key_before, input key_back, input key_left, input key_right, output [3:0]LED, output TFT_RST, output TFT_CS, output TFT_RS, output TFT_WR, output [15:0]TFT_Data ); wire Full_Sig; wire Write_Sig; wire [31:0]FIFO_Write_Data; key_control key_control ( //.LED(LED), .CLK(CLK), .RSTn(RSTn), .key_before(key_before), .key_back(key_back), .key_left(key_left), .key_right(key_right), //fifo写部分 .Full_Sig(Full_Sig), .Write_Sig(Write_Sig), .FIFO_Write_Data(FIFO_Write_Data) ); TFT_Interface TFT_Interface ( .LED(LED), .CLK(CLK), .RSTn(RSTn), //fifo写部分 .Full_Sig(Full_Sig), .Write_Sig(Write_Sig), .FIFO_Write_Data(FIFO_Write_Data), .TFT_RST(TFT_RST), .TFT_CS(TFT_CS), .TFT_RS(TFT_RS), .TFT_WR(TFT_WR), .TFT_Data(TFT_Data) ); endmodule
2、TFT_Interface：LCD顶层文件
module TFT_Interface
(
output [3:0]LED,
input CLK,
input RSTn,
//fifo写部分
output Full_Sig,
input Write_Sig,
input [31:0]FIFO_Write_Data,
output TFT_RST,
output TFT_CS,
output TFT_RS,
output TFT_WR,
output [15:0]TFT_Data
);
parameter WHITE = 16'hFFFF;
parameter BLACK = 16'h0000;
parameter GREY = 16'hF7DE;
parameter BLUE = 16'h001F;
parameter BLUE2 = 16'h051F;
parameter RED = 16'hF800;
parameter MAGENTA = 16'hF81F;
parameter GREEN = 16'h07E0;
parameter CYAN = 16'h7FFF;
parameter YELLOW = 16'hFFE0;
reg Init_Start;
wire Init_Done;
wire [18:0]Init_oData;
TFT_Init TFT_Init
(
.CLK(CLK),
.RSTn(RSTn),
.Start_Sig(Init_Start),
.Done(Init_Done),
.oData(Init_oData) //{1'TFT_CS,1'TFT_RS,1'TFT_WR,16'TFT_Data}
);
reg Clear_Start;
wire Clear_Done;
wire [18:0]Clear_oData;
TFT_Clear TFT_Clear
(
.CLK(CLK),
.RSTn(RSTn),
.Start_Sig(Clear_Start),
.Done(Clear_Done),
.Color(BLACK),
.oData(Clear_oData)
);
reg Point_Start;
wire Point_Done;
wire [18:0]Point_oData;
reg [15:0]X_Pos = 16'd0;
reg [15:0]Y_Pos = 16'd0;
TFT_DrawPoint TFT_DrawPoint
(
.CLK(CLK),
.RSTn(RSTn),
.Start_Sig(Point_Start),
.Done(Point_Done),
.X_Pos(X_Pos),
.Y_Pos(Y_Pos),
.Color(RED),
.oData(Point_oData) //{1'TFT_CS,1'TFT_RS,1'TFT_WR,16'TFT_Data}
);
//-------------------------FIFO例化部分-----------------------------------
//fifo读部分
wire Empty_Sig;
reg Read_Sig = 1'b0;
wire [31:0]FIFO_Read_Data;
//宽度为32，深度为512～～
fifo PosFIFO
(
.clk(CLK),
.din(FIFO_Write_Data), // Bus [31 : 0]
.wr_en(Write_Sig),
.rd_en(Read_Sig),
.dout(FIFO_Read_Data), // Bus [31 : 0]
.full(Full_Sig),
.empty(Empty_Sig)
);
//--------------------------------TFT总体控制---------------------------------------
reg [2:0]i;
always @(posedge CLK or negedge RSTn)
if(!RSTn)
begin
i <= 3'd0;
Init_Start <= 1'b0;
Clear_Start <= 1'b0;
Point_Start <= 1'b0;
end
else
case(i)
0://Initialization
begin
if(Init_Done)begin Init_Start <= 1'b0; i <= i + 1'b1; end
else begin Init_Start <= 1'b1; end
end
1://Clear the screen
begin
if(Clear_Done)begin Clear_Start <= 1'b0; i <= i + 1'b1; end
else begin Clear_Start <= 1'b1; end
end
//-----------------fifo读部分-----------------------
2://FIFO read
begin
if(!Empty_Sig)begin Read_Sig <= 1'b1; i <= i + 1'b1;end
else begin Read_Sig <= 1'b0; i <= i; end
end
3:
begin
Read_Sig <= 1'b0;
i <= i + 1'b1;
end
4://赋值将要绘制的点
begin
X_Pos <= FIFO_Read_Data[31:16];
Y_Pos <= FIFO_Read_Data[15:0];
i <= i + 1'b1;
end
5://draw
begin
if(Point_Done)begin Point_Start <= 1'b0; i <= 3'd2; end
else begin Point_Start <= 1'b1; end
end
default:
begin
i <= 3'd0;
Init_Start <= 1'b0;
Clear_Start <= 1'b0;
Point_Start <= 1'b0;
end
endcase
assign LED = i;
//--------------------------------TFT引脚驱动选择器--------------------------------
reg rTFT_CS = 1'b0;
reg rTFT_RS = 1'b0;
reg rTFT_WR = 1'b0;
reg [15:0]rTFT_Data = 16'd0;
always @(*)
case(i)
0://TFT初始化过程
begin
rTFT_CS = Init_oData[18];
rTFT_RS = Init_oData[17];
rTFT_WR = Init_oData[16];
rTFT_Data = Init_oData[15:0];
end
1://TFT清屏过程
begin
rTFT_CS = Clear_oData[18];
rTFT_RS = Clear_oData[17];
rTFT_WR = Clear_oData[16];
rTFT_Data = Clear_oData[15:0];
end
5://TFT打点过程
begin
rTFT_CS = Point_oData[18];
rTFT_RS = Point_oData[17];
rTFT_WR = Point_oData[16];
rTFT_Data = Point_oData[15:0];
end
default:
begin
rTFT_CS = 1'bz;
rTFT_RS = 1'bz;
rTFT_WR = 1'bz;
rTFT_Data = 16'bzzzz_zzzz_zzzz_zzzz;
end
endcase
assign TFT_CS = rTFT_CS;
assign TFT_RS = rTFT_RS;
assign TFT_WR = rTFT_WR;
assign TFT_Data = rTFT_Data;
assign TFT_RST = 1'b1;
endmodule
3、TFT_Init：LCD初始化模块
module TFT_Init
(
input CLK,
input RSTn,
input Start_Sig,
output reg Done,
output [18:0]oData //{1'TFT_CS,1'TFT_RS,1'TFT_WR,16'TFT_Data}
);
reg [31:0]Write_reg_data;
reg Reg_Start;
wire Reg_Done;
Write_Reg Write_Reg
(
.CLK(CLK),
.RSTn(RSTn),
.Start_Sig(Reg_Start),
.Done(Reg_Done),
//--
.Write_reg_data(Write_reg_data), //{16'reg,16'COM}
.oData(oData) //{1'TFT_CS,1'TFT_RS,1'TFT_WR,16'TFT_Data}
);
reg [5:0]i;
always @(posedge CLK or negedge RSTn)
if(!RSTn)
begin
i <= 6'd0;
Done <= 1'b0;
Write_reg_data <= 32'h0;
Reg_Start <= 1'b0;
end
else if(Start_Sig)
case(i)
0://打开晶振
begin
if(Reg_Done)begin Reg_Start <= 1'b0; i <= i + 1'b1; end
else begin Reg_Start <= 1'b1; Write_reg_data <= {16'h0,16'h1}; end
end
1://电源控制1 ；0xA8A4
begin
if(Reg_Done)begin Reg_Start <= 1'b0; i <= i + 1'b1; end
else begin Reg_Start <= 1'b1; Write_reg_data <= {16'h3,16'hA8A4}; end
end
2://电源控制2
begin
if(Reg_Done)begin Reg_Start <= 1'b0; i <= i + 1'b1; end
else begin Reg_Start <= 1'b1; Write_reg_data <= {16'hC,16'h0}; end
end
3://电源控制3
begin
if(Reg_Done)begin Reg_Start <= 1'b0; i <= i + 1'b1; end
else begin Reg_Start <= 1'b1; Write_reg_data <= {16'hD,16'h080C}; end
end
4://电源控制4
begin
if(Reg_Done)begin Reg_Start <= 1'b0; i <= i + 1'b1; end
else begin Reg_Start <= 1'b1; Write_reg_data <= {16'hE,16'h2B00}; end
end
5://电源控制5
begin
if(Reg_Done)begin Reg_Start <= 1'b0; i <= i + 1'b1; end
else begin Reg_Start <= 1'b1; Write_reg_data <= {16'h1E,16'hB0}; end
end
6://控制液晶的扫描模式(这个设置比较讲究，可查看日记)
begin
if(Reg_Done)begin Reg_Start <= 1'b0; i <= i + 1'b1; end
else begin Reg_Start <= 1'b1; Write_reg_data <= {16'h1,16'h2B3F}; end
end
7://液晶驱动AC控制
begin
if(Reg_Done)begin Reg_Start <= 1'b0; i <= i + 1'b1; end
else begin Reg_Start <= 1'b1; Write_reg_data <= {16'h2,16'h600}; end
end
8://睡眠控制
begin
if(Reg_Done)begin Reg_Start <= 1'b0; i <= i + 1'b1; end
else begin Reg_Start <= 1'b1; Write_reg_data <= {16'h10,16'h0}; end
end
9://设置为竖屏 //定义数据格式 16位色
begin
if(Reg_Done)begin Reg_Start <= 1'b0; i <= i + 1'b1; end
else begin Reg_Start <= 1'b1; Write_reg_data <= {16'h11,16'h6070}; end
end
10://共享寄存器1
begin
if(Reg_Done)begin Reg_Start <= 1'b0; i <= i + 1'b1; end
else begin Reg_Start <= 1'b1; Write_reg_data <= {16'h5,16'h0}; end
end
11://共享寄存器2
begin
if(Reg_Done)begin Reg_Start <= 1'b0; i <= i + 1'b1; end
else begin Reg_Start <= 1'b1; Write_reg_data <= {16'h6,16'h0}; end
end
12://水平玄关,设置每行有效像素的数目。每行有效像素数等于到XL[7:0]+1
begin
if(Reg_Done)begin Reg_Start <= 1'b0; i <= i + 1'b1; end
else begin Reg_Start <= 1'b1; Write_reg_data <= {16'h16,16'hEF1C}; end
end
13://垂直玄关
begin
if(Reg_Done)begin Reg_Start <= 1'b0; i <= i + 1'b1; end
else begin Reg_Start <= 1'b1; Write_reg_data <= {16'h17,16'h3}; end
end
14://显示控制 0x0233
begin
if(Reg_Done)begin Reg_Start <= 1'b0; i <= i + 1'b1; end
else begin Reg_Start <= 1'b1; Write_reg_data <= {16'h7,16'h233}; end
end
15://帧周期控制,??
begin
if(Reg_Done)begin Reg_Start <= 1'b0; i <= i + 1'b1; end
else begin Reg_Start <= 1'b1; Write_reg_data <= {16'hB,16'h0}; end
end
16://栅极扫描开始地址
begin
if(Reg_Done)begin Reg_Start <= 1'b0; i <= i + 1'b1; end
else begin Reg_Start <= 1'b1; Write_reg_data <= {16'hF,16'h0}; end
end
17://垂直卷轴控制 1
begin
if(Reg_Done)begin Reg_Start <= 1'b0; i <= i + 1'b1; end
else begin Reg_Start <= 1'b1; Write_reg_data <= {16'h41,16'h0}; end
end
18://垂直卷轴控制 2
begin
if(Reg_Done)begin Reg_Start <= 1'b0; i <= i + 1'b1; end
else begin Reg_Start <= 1'b1; Write_reg_data <= {16'h42,16'h0}; end
end
19://第一个局部显示的起始位置 SS1[8:0]
begin
if(Reg_Done)begin Reg_Start <= 1'b0; i <= i + 1'b1; end
else begin Reg_Start <= 1'b1; Write_reg_data <= {16'h48,16'h0}; end
end
20://第一个局部显示的结束位置SE1[8:0] SS1<SE1<13EF
begin
if(Reg_Done)begin Reg_Start <= 1'b0; i <= i + 1'b1; end
else begin Reg_Start <= 1'b1; Write_reg_data <= {16'h49,16'h13F}; end
end
21://第二个局部显示的起始位置
begin
if(Reg_Done)begin Reg_Start <= 1'b0; i <= i + 1'b1; end
else begin Reg_Start <= 1'b1; Write_reg_data <= {16'h4A,16'h0}; end
end
22://第二个局部显示的结束位置
begin
if(Reg_Done)begin Reg_Start <= 1'b0; i <= i + 1'b1; end
else begin Reg_Start <= 1'b1; Write_reg_data <= {16'h4B,16'h0}; end
end
23://水平RAM地址;水平RAM的起始-结束地址位置 (00~EF)
begin
if(Reg_Done)begin Reg_Start <= 1'b0; i <= i + 1'b1; end
else begin Reg_Start <= 1'b1; Write_reg_data <= {16'h44,16'hEF00}; end
end
24://垂直RAM起始地址
begin
if(Reg_Done)begin Reg_Start <= 1'b0; i <= i + 1'b1; end
else begin Reg_Start <= 1'b1; Write_reg_data <= {16'h45,16'h0}; end
end
25://垂直RAM结束地址
begin
if(Reg_Done)begin Reg_Start <= 1'b0; i <= i + 1'b1; end
else begin Reg_Start <= 1'b1; Write_reg_data <= {16'h46,16'h13F}; end
end
26://伽马控制1
begin
if(Reg_Done)begin Reg_Start <= 1'b0; i <= i + 1'b1; end
else begin Reg_Start <= 1'b1; Write_reg_data <= {16'h30,16'h0707}; end
end
27://伽马控制2
begin
if(Reg_Done)begin Reg_Start <= 1'b0; i <= i + 1'b1; end
else begin Reg_Start <= 1'b1; Write_reg_data <= {16'h31,16'h0204}; end
end
28://伽马控制3
begin
if(Reg_Done)begin Reg_Start <= 1'b0; i <= i + 1'b1; end
else begin Reg_Start <= 1'b1; Write_reg_data <= {16'h32,16'h0204}; end
end
29://伽马控制4
begin
if(Reg_Done)begin Reg_Start <= 1'b0; i <= i + 1'b1; end
else begin Reg_Start <= 1'b1; Write_reg_data <= {16'h33,16'h0502}; end
end
30://伽马控制5
begin
if(Reg_Done)begin Reg_Start <= 1'b0; i <= i + 1'b1; end
else begin Reg_Start <= 1'b1; Write_reg_data <= {16'h34,16'h0507}; end
end
31://伽马控制6
begin
if(Reg_Done)begin Reg_Start <= 1'b0; i <= i + 1'b1; end
else begin Reg_Start <= 1'b1; Write_reg_data <= {16'h35,16'h0204}; end
end
32://伽马控制7
begin
if(Reg_Done)begin Reg_Start <= 1'b0; i <= i + 1'b1; end
else begin Reg_Start <= 1'b1; Write_reg_data <= {16'h36,16'h0204}; end
end
33://伽马控制8
begin
if(Reg_Done)begin Reg_Start <= 1'b0; i <= i + 1'b1; end
else begin Reg_Start <= 1'b1; Write_reg_data <= {16'h37,16'h0502}; end
end
34://伽马控制9
begin
if(Reg_Done)begin Reg_Start <= 1'b0; i <= i + 1'b1; end
else begin Reg_Start <= 1'b1; Write_reg_data <= {16'h3A,16'h0302}; end
end
35://伽马控制10
begin
if(Reg_Done)begin Reg_Start <= 1'b0; i <= i + 1'b1; end
else begin Reg_Start <= 1'b1; Write_reg_data <= {16'h3B,16'h0302}; end
end
36://RAM write data mask (1)
begin
if(Reg_Done)begin Reg_Start <= 1'b0; i <= i + 1'b1; end
else begin Reg_Start <= 1'b1; Write_reg_data <= {16'h23,16'h0}; end
end
37://RAM write data mask (2)
begin
if(Reg_Done)begin Reg_Start <= 1'b0; i <= i + 1'b1; end
else begin Reg_Start <= 1'b1; Write_reg_data <= {16'h24,16'h0}; end
end
38://帧频率 510K
begin
if(Reg_Done)begin Reg_Start <= 1'b0; i <= i + 1'b1; end
else begin Reg_Start <= 1'b1; Write_reg_data <= {16'h25,16'h8000}; end
end
39://行首址0,设置GDDRAM Y的计数地址
begin
if(Reg_Done)begin Reg_Start <= 1'b0; i <= i + 1'b1; end
else begin Reg_Start <= 1'b1; Write_reg_data <= {16'h4F,16'h0}; end
end
40://列首址0,设置GDDRAM X的计数地址
begin
if(Reg_Done)begin Reg_Start <= 1'b0; i <= i + 1'b1; end
else begin Reg_Start <= 1'b1; Write_reg_data <= {16'h4E,16'h0}; end
end
41://
begin
Done <= 1'b1;
i <= i + 1'b1;
end
42://
begin
Done <= 1'b0;
i <= 6'd0;
end
default:
begin
i <= 6'd0;
Done <= 1'b0;
Write_reg_data <= 32'hffff_ffff;;
Reg_Start <= 1'b0;
end
endcase
endmodule
4、Write_Reg：LCD写寄存器模块
module Write_Reg
(
input CLK,
input RSTn,
input Start_Sig,
output reg Done,
//--
input [31:0]Write_reg_data,//{16'reg,16'COM}
output [18:0]oData //{1'TFT_CS,1'TFT_RS,1'TFT_WR,16'TFT_Data}
);
parameter RS_Com = 1'b0;
parameter RS_Data = 1'b1;
reg [16:0]Write_Data;
reg Write_Start;
wire Write_Done;
TFT_Write TFT_Write
(
.CLK(CLK),
//.RSTn(RSTn),
.iData(Write_Data),//{1'TFT_RS,16'TFT_Data}
.Start_Sig(Write_Start),
.oData(oData),//{1'TFT_CS,1'TFT_RS,1'TFT_WR,16'TFT_Data}
.Done(Write_Done)
);
reg [1:0]i;
always @(posedge CLK or negedge RSTn)
if(!RSTn)
begin
i <= 2'd0;
Write_Start <= 1'b0;
Write_Data <= 17'd0;
Done <= 1'b0;
end
else if(Start_Sig)
case(i)
0://写寄存器地址
begin
if(Write_Done) begin Write_Start <=1'b0; i <= i + 1'b1; end
else begin Write_Start <=1'b1; Write_Data <= { RS_Com, Write_reg_data[31:16] }; end
end
1://写命令
begin
if(Write_Done) begin Write_Start <=1'b0; i <= i + 1'b1; end
else begin Write_Start <=1'b1; Write_Data <= { RS_Data, Write_reg_data[15:0] }; end
end
2:
begin
Done <= 1'b1;
i <= i + 1'b1;
end
3:
begin
Done <= 1'b0;
i <= 2'd0;
end
endcase
endmodule
5、TFT_Clear：LCD清屏模块
module TFT_Clear
(
input CLK,
input RSTn,
input Start_Sig,
output reg Done,
input [15:0]Color,
output [18:0]oData
);
parameter RS_Com = 1'b0;
parameter RS_Data = 1'b1;
reg [16:0]Write_Data;
reg Write_Start;
wire Write_Done;
TFT_Write TFT_Write
(
.CLK(CLK),
// .RSTn(RSTn),
.iData(Write_Data),//{1'TFT_RS,16'TFT_Data}
.Start_Sig(Write_Start),
.oData(oData),//{1'TFT_CS,1'TFT_RS,1'TFT_WR,16'TFT_Data}
.Done(Write_Done)
);
reg [3:0]i;
reg [16:0]C0;
always @(posedge CLK or negedge RSTn)
if(!RSTn)
begin
i <= 4'd0;
Done <= 1'b0;
Write_Data <= 17'h0;
C0 <= 17'd0;
end
else if(Start_Sig)
case(i)
0://确定点的X坐标的寄存器
begin
if(Write_Done) begin Write_Start <=1'b0; i <= i + 1'b1; end
else begin Write_Start <=1'b1; Write_Data <= { RS_Com, 16'h4E}; end
end
1://确定X的坐标
begin
if(Write_Done) begin Write_Start <=1'b0; i <= i + 1'b1; end
else begin Write_Start <=1'b1; Write_Data <= { RS_Data, 16'h0 }; end
end
2://确定点的Y坐标的寄存器
begin
if(Write_Done) begin Write_Start <=1'b0; i <= i + 1'b1; end
else begin Write_Start <=1'b1; Write_Data <= { RS_Com, 16'h4F}; end
end
3://确定Y的坐标
begin
if(Write_Done) begin Write_Start <=1'b0; i <= i + 1'b1; end
else begin Write_Start <=1'b1; Write_Data <= { RS_Data, 16'h0 }; end
end
4://prepare to write to the LCD RAM
begin
if(Write_Done) begin Write_Start <=1'b0; i <= i + 1'b1; end
else begin Write_Start <=1'b1; Write_Data <= { RS_Com, 16'h22}; end
end
5://确定点的颜色
begin
if(Write_Done) begin Write_Start <=1'b0; i <= i + 1'b1; end
else begin Write_Start <=1'b1; Write_Data <= { RS_Data, Color}; end
end
6://循环～～76800 = 240*320
begin
if(C0 == 17'd76800) begin C0 <= 17'd0; i <= i + 1'b1; end
else begin C0 <= C0 + 1'b1; i <= i - 1'b1;end
end
7:
begin
Done <= 1'b1;
i <= i + 1'b1;
end
8:
begin
Done <= 1'b0;
i <= 4'd0;
end
default:
begin
i <= 4'd0;
Done <= 1'b0;
Write_Data <= 17'h1ffff;;
C0 <= 17'd0;
end
endcase
endmodule
6、TFT_DrawPoint：LCD画点模块
module TFT_DrawPoint
(
input CLK,
input RSTn,
input Start_Sig,
output reg Done,
input [15:0]X_Pos,
input [15:0]Y_Pos,
input [15:0]Color,
output [18:0]oData //{1'TFT_CS,1'TFT_RS,1'TFT_WR,16'TFT_Data}
);
// parameter X_Pos = 16'd55;
// parameter Y_Pos = 16'd55;
parameter RS_Com = 1'b0;
parameter RS_Data = 1'b1;
reg [16:0]Write_Data;
reg Write_Start;
wire Write_Done;
TFT_Write TFT_Write
(
.CLK(CLK),
.iData(Write_Data),//{1'TFT_RS,16'TFT_Data}
.Start_Sig(Write_Start),
.oData(oData),//{1'TFT_CS,1'TFT_RS,1'TFT_WR,16'TFT_Data}
.Done(Write_Done)
);
reg [2:0]i;
always @(posedge CLK or negedge RSTn)
if(!RSTn)
begin
i <= 3'd0;
Write_Data <= 17'h0;
Done <= 1'b0;
end
else if(Start_Sig)
case(i)
0://确定点的X坐标的寄存器
begin
if(Write_Done) begin Write_Start <=1'b0; i <= i + 1'b1; end
else begin Write_Start <=1'b1; Write_Data <= { RS_Com, 16'h4E}; end
end
1://确定X的坐标
begin
if(Write_Done) begin Write_Start <=1'b0; i <= i + 1'b1; end
else begin Write_Start <=1'b1; Write_Data <= { RS_Data, X_Pos }; end
end
2://确定点的Y坐标的寄存器
begin
if(Write_Done) begin Write_Start <=1'b0; i <= i + 1'b1; end
else begin Write_Start <=1'b1; Write_Data <= { RS_Com, 16'h4F}; end
end
3://确定Y的坐标
begin
if(Write_Done) begin Write_Start <=1'b0; i <= i + 1'b1; end
else begin Write_Start <=1'b1; Write_Data <= { RS_Data, Y_Pos }; end
end
4://prepare to write to the LCD RAM
begin
if(Write_Done) begin Write_Start <=1'b0; i <= i + 1'b1; end
else begin Write_Start <=1'b1; Write_Data <= { RS_Com, 16'h22}; end
end
5://确定点的颜色
begin
if(Write_Done) begin Write_Start <=1'b0; i <= i + 1'b1; end
else begin Write_Start <=1'b1; Write_Data <= { RS_Data, Color }; end
end
6:
begin
Done <= 1'b1;
i <= i + 1'b1;
end
7:
begin
Write_Data <= 17'h1ffff;//为了消除警告，其实不加也不影响结果～～
Done <= 1'b0;
i <= 3'd0;
end
endcase
endmodule
7、TFT_Write：LCD写时序模块
module TFT_Write
(
input CLK,
input [16:0]iData,//{1'TFT_RS,16'TFT_Data}
input Start_Sig,
output [18:0]oData,//{1'TFT_CS,1'TFT_RS,1'TFT_WR,16'TFT_Data}
output reg Done
);
reg CS; //驱动TFT片选
reg WR; //驱动TFT写信号
reg [15:0]Data; //驱动TFT数据总线
reg [2:0]i;
always @(posedge CLK)
if(Start_Sig)
case(i)
0:
begin
CS <= 1'b0;
WR <= 1'b0;
i <= i + 1'b1;
end
1:
begin
Data <= iData[15:0];
i <= i + 1'b1;
end
2://延时20ns，拉底CS 60ns，CS的读周期，最小是100ns
begin
i <= i + 1'b1;
end
3,4,5://保证CS拉高60ns，这样读的CS周期就大于100ns了～
begin
CS <= 1'b1;
WR <= 1'b1; //WR的上升沿数据锁存
i <= i + 1'b1;
end
6:
begin
Done <= 1'b1;
i <= i + 1'b1;
end
7:
begin
Done <= 1'b0;
i <= 3'd0;
end
endcase
assign oData = {CS,iData[16],WR,Data};
endmodule
8、key_control：按键控制顶层模块
module key_control
(
input CLK,
input RSTn,
input key_before,
input key_back,
input key_left,
input key_right,
//output reg[3:0]LED,
//output [3:0]LED,
//fifo写部分
input Full_Sig,
output reg Write_Sig,
output reg [31:0]FIFO_Write_Data
);
reg [15:0]X_Pos = 16'd0;
reg [15:0]Y_Pos = 16'd0;
wire before_down;
wire before_up;
wire back_down;
wire back_up;
wire left_down;
wire left_up;
wire right_down;
wire right_up;
Key key
(
.CLK(CLK),
.RSTn(RSTn),
.key_before(key_before),
.key_back(key_back),
.key_left(key_left),
.key_right(key_right),
.before_down(before_down),
.before_up(before_up),
.back_down(back_down),
.back_up(back_up),
.left_down(left_down),
.left_up(left_up),
.right_down(right_down),
.right_up(right_up)
);
//-------------------------KEY按键绘图部分------------------------
//------------------------向FIFO中写数据-------------------------
reg [3:0]i;
reg [15:0]Xpos;
reg [15:0]Ypos;
reg [15:0]Ytemp = 16'd0;
reg [19:0]C0 = 20'd0;
always @(posedge CLK or negedge RSTn)
if(!RSTn)
begin
Write_Sig <= 1'b0;
FIFO_Write_Data <= 32'd0;
Xpos <= 16'd0;
Ypos <= 16'd0;
i <= 4'd0;
end
else
case(i)
0://start point
begin
Xpos <= 16'd55;
Ypos <= 16'd55;
i <= i + 1'b1;
end
1://TFT坐标系转换,(将原点定在竖屏的左下角)
begin
Ytemp <= 16'd319 - Ypos;
i <= i + 1'b1;
end
2://write a start point
begin
if(!Full_Sig)
begin
Write_Sig <= 1'b1;
FIFO_Write_Data <= {Xpos,Ytemp};
//FIFO_Write_Data <= {Xpos,Ypos};
i <= i + 1'b1;
end
else
begin
Write_Sig <= 1'b0;
FIFO_Write_Data <= FIFO_Write_Data;
i <= i;
end
end
3:
begin
Write_Sig<= 1'b0;
i <= i + 1'b1;
end
4://choose//判断按键是否按下
begin
if(before_down) i <= 4'd5;
else if(back_down) i <= 4'd6;
else if(left_down) i <= 4'd7;
else if(right_down) i <= 4'd8;
end
5://前进
begin
if(before_up)
begin
i <= 4'd4;
Write_Sig <= 1'b0;
C0 <= 20'd0;
end
else
begin
if(C0 == 20'hf_ffff)
begin
C0 <= 20'd0;
Write_Sig <= 1'b1;
Ypos <= Ypos + 1'b1;
FIFO_Write_Data <= {Xpos,(16'd319 - Ypos)};
i <= i;
end
else
begin
C0 <= C0 + 1'b1;
end
end
end
6://后退
begin
if(back_up)
begin
i <= 4'd4;
Write_Sig <= 1'b0;
C0 <= 20'd0;
end
begin
if(C0 == 20'hf_ffff)
begin
C0 <= 20'd0;
Write_Sig <= 1'b1;
Ypos <= Ypos - 1'b1;
FIFO_Write_Data <= {Xpos,(16'd319 - Ypos)};
i <= i;
end
else
begin
C0 <= C0 + 1'b1;
end
end
end
7://左转
begin
if(left_up)
begin
i <= 4'd4;
Write_Sig <= 1'b0;
C0 <= 20'd0;
end
begin
if(C0 == 20'hf_ffff)
begin
C0 <= 20'd0;
Write_Sig <= 1'b1;
Xpos <= Xpos - 1'b1;
FIFO_Write_Data <= {Xpos,(16'd319 - Ypos)};
i <= i;
end
else
begin
C0 <= C0 + 1'b1;
end
end
end
8://右转
begin
if(right_up)
begin
i <= 4'd4;
Write_Sig <= 1'b0;
C0 <= 20'd0;
end
begin
if(C0 == 20'hf_ffff)
begin
C0 <= 20'd0;
Write_Sig <= 1'b1;
Xpos <= Xpos + 1'b1;
FIFO_Write_Data <= {Xpos,(16'd319 - Ypos)};
i <= i;
end
else
begin
C0 <= C0 + 1'b1;
end
end
end
default
begin
Write_Sig <= 1'b0;
FIFO_Write_Data <= 32'd0;
Xpos <= 16'd0;
Ypos <= 16'd0;
i <= 4'd0;
end
endcase
endmodule
9、Key：4路按键封装模块
module Key ( input CLK, input RSTn, input key_before, input key_back, input key_left, input key_right, output before_down, output before_up, output back_down, output back_up, output left_down, output left_up, output right_down, output right_up ); key_moudle key_before_moudle ( .CLK(CLK), .RSTn(RSTn), .keypin(key_before), .key_down(before_down), .key_up(before_up) ); key_moudle key_back_moudle ( .CLK(CLK), .RSTn(RSTn), .keypin(key_back), .key_down(back_down), .key_up(back_up) ); key_moudle key_left_moudle ( .CLK(CLK), .RSTn(RSTn), .keypin(key_left), .key_down(left_down), .key_up(left_up) ); key_moudle key_right_moudle ( .CLK(CLK), .RSTn(RSTn), .keypin(key_right), .key_down(right_down), .key_up(right_up) ); endmodule
10、key_moudle：一路按键检测模块
module key_moudle ( input CLK, input RSTn, input keypin, output key_down, output key_up ); reg key_rst; always @( posedge CLK or negedge RSTn ) begin if( !RSTn ) key_rst <= 1'b1; else key_rst <= keypin; end reg key_rst_r; always @( posedge CLK or negedge RSTn ) begin if( !RSTn ) key_rst_r <= 1'b1; else key_rst_r <= key_rst; end wire key_an = key_rst_r & (~key_rst); //------------------------------------------ reg[19:0] cnt; always @( posedge CLK or negedge RSTn ) begin if( !RSTn ) cnt <= 20'd0; else if(key_an) cnt <= 20'd0;//一旦key_an有抖动的情况cnt都会重新计数 else cnt <= cnt + 1'b1; end //------------------------------------------ reg low_sw; always @( posedge CLK or negedge RSTn ) begin if( !RSTn ) low_sw <= 1'b1; else if( cnt == 20'hfffff ) low_sw <= keypin;//稳定之后的key值 end reg low_sw_r; always @( posedge CLK or negedge RSTn ) begin if( !RSTn ) low_sw_r <= 1'b1; else low_sw_r <= low_sw; end assign key_down = low_sw_r & (~low_sw); assign key_up = (~low_sw_r) & low_sw; endmodule
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