matlab guide串口中断的通信

为了能够很好的调节PID,我现学了matlab gui界面的设计，及实时曲线的绘制，能够很方便的调节PID。单片机可以把设定值和返回值通过232串口传输到上位机，上位机通过修改P I D 的参数也可以实时的传输给下位机。界面图如下：

1、pid.m文件部分重要程序如下

function pushbutton1_Callback(hObject, eventdata, handles)

global s;

s=serial('COM3');

set(s,'BaudRate',9600,'DataBit',8,'StopBits',1,'Parity','none','F lowControl','none');

s.InputBufferSize=1020;

s.OutputBufferSize=1024;

s.ReadAsyncMode='continuous';

s.BytesAvailableFcnMode='byte';

s.Timeout=0.2;

s.TimerPeriod=0.5;

s.TimerFcn=@instrcallback;

s.Terminator='CR';

warning off;

fopen(s);

function pushbutton2_Callback(hObject, eventdata, handles)

global s;

fclose(s);

delete(s);

clear s;

function pushbutton3_Callback(hObject, eventdata, handles) global P;

global I;

global D;

global pi;

global pid;

P=str2num(get(handles.edit1,'string'));

I=str2num(get(handles.edit2,'string'));

D=str2num(get(handles.edit3,'string'));

pi=[P,I*1000];

pid=[pi,D];

fwrite(s,pid);

2、instrcallback.m的中断程序如下：

function instrcallback(obj, event)

handles=guihandles();

%axes(handles.axes1);

global out;

global count;

global data;

global data1;

global data2;

global data3;

global data4;

global data5;

global alldatas1;

global alldatas2;

global s;

global i;

global m;

global n;

global x;

m=1;

n=1;

x=1;

[out,count]=fread(obj,1020,'uint8');

%set(handles.text9,'string',count);

for i=1:count/3

if (out(i)==0)&(out(i+1)==255)

data(i)=out(i+2);

data1(i)=out(i+3);

data2(i)=data(i)*256+data1(i);

for m=1:1:10

alldatas1(x)=alldatas1(x)+data2(m);

end

alldatas1(x)=alldatas1(x)/10;

set(handles.text16,'string',alldatas1(x));

plot(x,alldatas1(x),'r.');

alldatas1(x)=0;

data3(i)=out(i+4);

data4(i)=out(i+5);

data5(i)=data3(i)*256+data4(i);

for n=1:1:10

alldatas2(x)=alldatas2(x)+data5(n);

end

alldatas2(x)=alldatas2(x)/10;

set(handles.text19,'string',alldatas2(x)); plot(x,alldatas2(x),'g.');

alldatas2(x)=0；

set(handles.text20,'string',x);

x=x+1;

if x>1000

cla ;

x=1;

end

end

end

%set(handles.text10,'string',data2);

%set(handles.text21,'string',data5);