[MATLAB App Designer] 用MATLAB写一个上位机--基于串

搜索串口：

COM_x = serialportlist("available");%搜索可用串口

      if isempty(COM_x)

        warndlg('No available COM port', 'Warning');

      else

        app.COMListBox.Items = COM_x;

      end

创建串口：

      value = app.Switch.Value;

      switch value

        case 1

          %创建串口 选择COM口 波特率 默认校验 N 8 1

          app.setupCOM = serialport(app.COMListBox.Value, str2double(app.DropDown.Value));

          app.setupCOM.Timeout = 1;%接收超时 时间

          app.Lamp.Color = [0 1 0];

        case 0

          app.Lamp.Color = [1 0 0];

          delete(app.setupCOM);%删除串口

      end

读取并显示：

y = zeros(2000, 1);%随便定义一个存储空间

      while 1

        if app.ReadDataButton.Value == 0

          app.ReadDataButton.BackgroundColor = [0.98 0.91 0.91];

          return;%跳出循环

        else

          app.ReadDataButton.BackgroundColor = [0.91 0.98 0.96];

          data = read(app.setupCOM, 1, 'int8');%读取一个字节 的数据

          y = circshift(y, 1);%存储空间移位

          y(1) = data;

          plot(app.UIAxes, 1:500, y(1:500, 1));%实时显示存储的最近500个点

          app.DisplayEditField.Value = data;

          flush(app.setupCOM);

          pause(0.01);%暂停0.01s

        end

      end