通过FPGA将图片信息通过RS232串口发送到PC端，使用MATLAB进行图片显示

Posted 2022-03-16 fpga&matlab

1.仿真预览

2.部分核心代码

FPGA部分代码

module uarttx(clk,reset,datain,wrsig,tx);

input		clk;   
input		reset;       
input 	[7:0] datain;  
input 	wrsig;		 

output 	tx;			 

reg 		idle;
reg		tx;
reg 		send;
reg 		wrsigbuf;
reg		wrsigrise;
reg 		presult;
reg 		[7:0] cnt;		

parameter paritymode=1'b0;

always @(posedge clk)
begin
	wrsigbuf<=wrsig;
	wrsigrise<=(~wrsigbuf) & wrsig;
end

always @(posedge clk or negedge reset)         
begin
	if(reset==1'b0)
	begin
		send<=1'b0;		
	end
	else
	begin

	send<=1'b1;			

	end
end

always @(posedge clk or negedge reset)			
begin
	if(reset==1'b0)
	begin
	
		cnt<=8'd0;
		tx<=1'b1;
	end
else begin
		case(cnt)			  
		8'd0:
			begin
				tx<=1'b0;	 
				idle<=1'b1;
				cnt<=cnt+8'd1;
			end
		8'd16:
			begin
				tx<=datain[0];
				presult<=datain[0]^paritymode;
				idle<=1'b1;
				cnt<=cnt+8'd1;
			end
		8'd32:
			begin
				tx<=datain[1];
				presult<=datain[1]^presult;
				idle<=1'b1;
				cnt<=cnt+8'd1;
			end
		8'd48:
			begin
				tx<=datain[2];
				presult<=datain[2]^presult;
				idle<=1'b1;
				cnt<=cnt+8'd1;
			end
		8'd64:
			begin
				tx<=datain[3];
				presult<=datain[3]^presult;
				idle<=1'b1;
				cnt<=cnt+8'd1;
			end
		8'd80:
			begin
				tx<=datain[4];
				presult<=datain[4]^presult;
				idle<=1'b1;
				cnt<=cnt+8'd1;
			end
		8'd96:
			begin
				tx<=datain[5];
				presult<=datain[5]^presult;
				idle<=1'b1;
				cnt<=cnt+8'd1;
			end
		8'd112:
			begin
				tx<=datain[6];
				presult<=datain[6]^presult;
				idle<=1'b1;
				cnt<=cnt+8'd1;
			end
		8'd128:
			begin
				tx<=datain[7];
				presult<=datain[7]^presult;
				idle<=1'b1;
				cnt<=cnt+8'd1;
			end
		8'd144:
			begin
				tx<=presult;
				presult<=datain[0]^paritymode;
				idle<=1'b1;
				cnt<=cnt+8'd1;
			end
		8'd160:
			begin
				tx<=1'b1;
				idle<=1'b1;
				cnt<=cnt+8'd1;
			end
		8'd176:
			begin
				tx<=1'b1;
				idle<=1'b0;
				cnt<=cnt+8'd1;
			end
		default:
			begin
				cnt<=cnt+8'd1;
			end
			endcase
	end
 
end
endmodule 			

MATLAB部分代码

global FileName;
global RR;
global CC;

RR=250;
CC=250;

C1=str2num(get(handles.edit1,'String'));

if C1==1
   Serial_obj=serial('COM1');  
end
if C1==2
   Serial_obj=serial('COM2');  
end
if C1==3
   Serial_obj=serial('COM3');  
end
if C1==4
   Serial_obj=serial('COM4');  
end

Serial_obj.BaudRate=str2num(get(handles.edit2,'String'));  
Serial_obj.DataBits=str2num(get(handles.edit3,'String'));  
Serial_obj.Parity='none';  
Serial_obj.StopBits=str2num(get(handles.edit4,'String'));  
% Serial_obj.Terminator=0;  
Serial_obj.InputBufferSize=RR*CC;  %保存扫描的5000*1行数据，保存1000个
% Serial_obj.timeout=20;  

%% 创建txt文档。  
Name    = clock; 
FileName=[num2str(Name(5)),num2str(round(Name(6))),'.txt'];  
FileID1=fopen(FileName,'a+');  
 
%% 打开串口，读写串口内容。  
fopen(Serial_obj);  
 
Temp_2 = [fscanf(Serial_obj,'%d')]'; 
fprintf(FileID1,'%d\\n',Temp_2);                  % Write data to text file  
fprintf(FileID1,'\\n');
 
   
%% 关闭串口，清理缓存区  
fclose(FileID1);
fclose(Serial_obj);  
delete(Serial_obj);  
clear Serial_obj  

msgbox('读取结束');
% --- 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 FileName;
global RR;
global CC;

I = load(FileName); 

%读取标志信号
start = [];
for i = 5001:length(I)
    tmps = I(i-5000:i-1);
    cnt  = 0;
    for j = 1:length(tmps)
        if tmps(j) == 153 
           cnt = cnt + 1;  
        end
    end
    if cnt==5000
       start = [start,i+1];
    end
end

pix_bigen = start(end);

if isempty(pix_bigen)==0
II        = I(pix_bigen:end);
else
II        = I;    
end

if length(II) < RR*CC
   III = [II;zeros(RR*CC-length(II),1);]; 
else
   III = II;
end


I2= [reshape(III,[RR,CC])]';
I3 = zeros(size(I2));

axes(handles.axes1);


KK=10;
for i = 1:RR/KK
    I3(KK*(i-1)+1:KK*i,:) = I2(KK*(i-1)+1:KK*i,:);
    imshow(uint8(I3));
    hold off
    drawnow;
end

A38-09