通过FPGA实现USB接口传输图片，通过MATLAB对图片进行显示

1.仿真预览

2.理论分析

标准的硬件系统图像显示流程如下：

但是在仿真阶段，为了验证USB的功能，我们需要对系统的工作模式做下调整，使得符合仿真使用。具体如下所示：

注意，由于摄像机，在仿真阶段，没法获得实际的图片，我们这里通过摄像机驱动，驱动我们的存储器中的图片输出图像。然后将图像数据通过USB进行输出，并在modelsim仿真过程中，将仿真数据保存，然后用matlab对仿真数据进行解析，得到图像，从而验证USB接口的正确性。

然后配置上，还包括CY7C68013芯片的配置两个部分。

注意，由于我们将测试图片，做到FPGA的缓存中用于仿真了，实际下载硬件这个环节是没有的，所以这个做法会导致资源不够，所以再编译的时候按点如下安健：

（所以，我们这里采用图片大小是600*800的，原始相机3000多扫描，FPGA仿真会非常非常非常非常非常慢，所以这里用较小的图片，然后后面提供的matlab成像软件，还是按照扫描模式来成像的。）

即第二个安健，这个安健是只针对仿真的综合过程，

第一个安健是下载硬件的安健，这里由于设置了缓存，所以肯定会资源不够，所以不用点这个安健。

下面介绍USB接口的定义：

1.USB时钟，

2.复位信号，

3.图像数据输入到USB接口，这个接口要加入FIFO

4.USB中断信号输入

5.USB读写使能信号

6.USB输出到电脑的接口，外部接口，这个接口要加入FIFO

7.输入信号触发信号

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运行QII12.1版本软件，

首先可以看到系统的RTL结构图

进行modelsim仿真，得到如下的仿真结果：

仿真之后会产生，这个文件在

打开这个文件，将前面多个xx删除，然后复制到matlab文件夹

然后用matlab软件进行数据还原

双击读取数据，然后再点击显示图像，得到如下结果：

说明USB数据接口成功。

3.部分核心代码

`timescale 1ns / 10psmodule tops(i_clk,i_rst,clk1,clk2,o_R_ccd,o_G_ccd,o_B_ccd,o_RGB,o_hang_plus,//usb fifo ino_data_fifo_in,o_almost_full_in,o_full_in,o_empty_in,o_usedw_in,//USB outputo_wr_en,o_usb_start,o_USB_dout,o_rec_dat,o_rec_done,//usb fifo outo_data_fifo_o,o_almost_full_o,o_full_o,o_empty_o,o_usedw_o,SampleEnd,ifclk,slwr,slcs,PKTEND,addr0,addr1,flagb_led,flagc_led,flaga_led,slrd,sloe,stop,fifo_data);input      i_clk;
input      i_rst;
output     clk1;
output     clk2;
output[7:0]o_R_ccd;
output[7:0]o_G_ccd;
output[7:0]o_B_ccd;
output[7:0]o_RGB;
output     o_hang_plus;output[7:0]o_data_fifo_in;
output     o_almost_full_in;
output     o_full_in;
output     o_empty_in;
output[9:0]o_usedw_in;output     o_wr_en;
output     o_usb_start;
output[7:0]o_USB_dout;
output[7:0]o_rec_dat;
output     o_rec_done;output[7:0]o_data_fifo_o;
output     o_almost_full_o;
output     o_full_o;
output     o_empty_o;
output[9:0]o_usedw_o;output SampleEnd;
output ifclk;
output slwr;
output slcs;
output PKTEND;
output addr0;
output addr1;
output flagb_led;
output flagc_led;
output flaga_led;
output slrd;
output sloe;
output stop;
output[7:0] fifo_data;//clk 3divider
//clk 3divider
//clk 3divider
//clk 3divider
//clk 3divider
//clk 3divider
//clk 3divider
//clk 3divider
reg[3:0]cnt;
reg     clk1;
reg     clk2;
always @(posedge i_clk or posedge i_rst)
beginif(i_rst)begincnt  <= 4'd0;clk1 <= 1'b0;clk2 <= 1'b0;end
else beginif(cnt==4'd6)cnt <= 4'd1;elsecnt <= cnt + 4'd1; if(cnt == 4'd1) clk1 <= 1'b1;elseclk1 <= 1'b0;if(cnt == 4'd1 | cnt == 4'd3  | cnt == 4'd5 ) clk2 <= 1'b1;elseclk2 <= 1'b0;           end
end//Images buffer to define the CCD
//Images buffer to define the CCD
//Images buffer to define the CCD
//Images buffer to define the CCD
//Images buffer to define the CCD
//Images buffer to define the CCD
//Images buffer to define the CCD
//Images buffer to define the CCD
//Images buffer to define the CCD
images_buffer uut(.i_clk1  (clk1),.i_clk2  (clk2),.i_rst   (i_rst),.i_ren   (1'b1), .o_R     (o_R_ccd),.o_G     (o_G_ccd),.o_B     (o_B_ccd),.o_image (o_RGB),.o_hang_plus(o_hang_plus)//逐行输出扫描，hangplus为行信号，标注每一行的信息);//USB interface******************************************************************************************************
//USB interface******************************************************************************************************
//USB interface******************************************************************************************************
//USB interface******************************************************************************************************
//USB interface******************************************************************************************************
//USB interface******************************************************************************************************
//USB interface******************************************************************************************************
//USB interface******************************************************************************************************//USB Controller
wire w_i;
wire r_i;
wire w_o;
wire r_o;
USB_send_controller ut4(.clk2 (clk2),.i_rst(i_rst),.w_i  (w_i),.r_i  (r_i),.w_o  (w_o),.r_o  (r_o));//fifo input
fifo_io fifo_io_u1(.aclr       (i_rst),.clock      (clk2),.data       (o_RGB),.rdreq      (r_i),.wrreq      (w_i),.almost_full(o_almost_full_in),.empty      (o_empty_in),.full       (o_full_in),.q          (o_data_fifo_in),.usedw      (o_usedw_in));//usb interface
usb_top usb_top_u(.i_clk            (clk2),      .i_rst            (i_rst),//USB中断控制输入信号.i_usb_interrupt  (1'b0),     //USB发送数据控制指令.i_trans_start    (1'b1),   //usb输入.i_USB_din        (o_data_fifo_in),    //输入发送数据长度 .i_USB_len        (8'd8),//write输出.o_wr_en          (o_wr_en), //read输出        .o_rd_en          (o_usb_start),         //usb输出.o_USB_dout       (o_USB_dout),      //输出数据.o_rec_dat        (o_rec_dat),     //接收完成标志.o_rec_done       (o_rec_done)      );//fifo output
fifo_io fifo_io_u2(.aclr       (i_rst),.clock      (clk2),.data       (o_USB_dout),.rdreq      (r_o),.wrreq      (w_o),.almost_full(o_almost_full_o),.empty      (o_empty_o),.full       (o_full_o),.q          (o_data_fifo_o),.usedw      (o_usedw_o));//CY7C68013驱动芯片的配置
wire SampleEnd;
wire ifclk;
wire slwr;
wire slcs;
wire PKTEND;
wire addr0;
wire addr1;
wire flagb_led;
wire flagc_led;
wire flaga_led;
wire slrd;
wire sloe;
wire stop;
wire[7:0] fifo_data;
CY7C68013_setup CY7C68013_setup_u
(.START(o_usb_start) ,  // input  START_sig.flaga(1'b1) ,  // input  flaga_sig.flagb(1'b1) ,  // input  flagb_sig.flagc(1'b1) ,  // input  flagc_sig.clkin(clk2) ,   // input  clkin_sig.SampleEnd(SampleEnd) ,  // output  SampleEnd_sig.ifclk    (ifclk) , // output  ifclk_sig.slwr     (slwr) ,  // output  slwr_sig.slcs     (slcs) ,   // output  slcs_sig.PKTEND   (PKTEND) , // output  PKTEND_sig.addr0    (addr0) ,    // output  addr0_sig.addr1    (addr1) , // output  addr1_sig.flagb_led(flagb_led) , // output  flagb_led_sig.flagc_led(flagc_led) , // output  flagc_led_sig.flaga_led(flaga_led) , // output  flaga_led_sig.slrd     (slrd) ,  // output  slrd_sig.sloe     (sloe) ,   // output  sloe_sig.stop     (stop) ,   // output  stop_sig.fifo_data(fifo_data)    // output [7:0] fifo_data_sig
);endmodule

function varargout = tops(varargin)gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...'gui_Singleton',  gui_Singleton, ...'gui_OpeningFcn', @tops_OpeningFcn, ...'gui_OutputFcn',  @tops_OutputFcn, ...'gui_LayoutFcn',  [] , ...'gui_Callback',   []);
if nargin && ischar(varargin{1})gui_State.gui_Callback = str2func(varargin{1});
endif nargout[varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
elsegui_mainfcn(gui_State, varargin{:});
end
% End initialization code - DO NOT EDIT% --- Executes just before tops is made visible.
function tops_OpeningFcn(hObject, eventdata, handles, varargin)
% This function has no output args, see OutputFcn.
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% varargin   command line arguments to tops (see VARARGIN)% Choose default command line output for tops
handles.output = hObject;% Update handles structure
guidata(hObject, handles);% UIWAIT makes tops wait for user response (see UIRESUME)
% uiwait(handles.figure1);% --- Outputs from this function are returned to the command line.
function varargout = tops_OutputFcn(hObject, eventdata, handles)
% varargout  cell array for returning output args (see VARARGOUT);
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)% Get default command line output from handles structure
varargout{1} = handles.output;% --- Executes on button press in pushbutton1.
function pushbutton1_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
global R1;
global G1;
global B1;
global I;
load data.txt
Len= 158;
R1 = [zeros(Len,1);data(2:3:2+3*480000-1-3*Len)];
G1 = [zeros(Len,1);data(3:3:3+3*480000-1-3*Len)];
B1 = [zeros(Len,1);data(4:3:4+3*480000-1-3*Len)];I(:,:,1) = [reshape(R1',[800,600])]';%一共产生600个行信息，扫描成像，我将扫描的效果给你放慢做出来了
I(:,:,2) = [reshape(G1',[800,600])]';
I(:,:,3) = [reshape(B1',[800,600])]';
msgbox('读取完毕');% --- Executes on button press in pushbutton2.
function pushbutton2_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton2 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
global R1;
global G1;
global B1;
global I;
axes(handles.axes1);
I2 = zeros(size(I));
KK=15;
for i = 1:600/KK
I2(KK*(i-1)+1:KK*i,:,1) = I(KK*(i-1)+1:KK*i,:,1);
I2(KK*(i-1)+1:KK*i,:,2) = I(KK*(i-1)+1:KK*i,:,2);
I2(KK*(i-1)+1:KK*i,:,3) = I(KK*(i-1)+1:KK*i,:,3);
imshow(uint8(I2));
hold off
drawnow;
end
% --- Executes on button press in pushbutton3.
function pushbutton3_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton3 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
clc;
clear;
close all;

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