MATLAB串口开关问题

xiannvjiejie

先描述下问题现象：
        正常打开关闭一次串口后，再次打开串口提示：
       打开失败: Cannot connect to the COM31port. Possible reasons are another application is connected to the port or the port does not exist. 出错 MSerialV1>pbOpenAndClose_Callback(line 122)    fopen(s);

4 ~0 Q) o, W; s  Q' S1 Z确认该串口没有在其它程序中使用！

以下是程序代码

set(handles.pmComPort,'String',seriallist);
indexCom = get(handles.pmComPort,'Value');
( [6 e  X" B. BstrCom = get(handles.pmComPort,'String');
2 O# i/ E7 S+ e  s" }if indexCom > 1
, m0 {2 w, W; ]1 ^  _+ @    comPort = strCom(indexCom);
else
6 _, m2 z2 }( e/ X    comPort = strCom;   
' x9 E. d: \. [6 J; k+ z' M( gend
* L1 W0 Q5 Z  f% ~0 W: [s = serial(comPort);
) |0 ?2 C$ A) u, B0 n3 `if handles.pbOpenAndClose.String == "打开"
    handles.pbOpenAndClose.String = "关闭";
! L' W; a8 J6 Z1 o) a, @& U    handles.pbOpenAndClose.BackgroundColor = 'g';
    fopen(s);   
else
    handles.pbOpenAndClose.String = "打开";
    handles.pbOpenAndClose.BackgroundColor = 'r';
    fclose(s);
    delete(s);
    clear s;
end
& A+ S0 a2 n# n3 a& [

finishedabc

试试过程中用指令能否正常退出串口，关闭串口