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

創(chuàng)建串口：

??????value = app.Switch.Value;

??????switch value

????????case 1

??????????%創(chuàng)建串口 選擇COM口 波特率 默認(rèn)校驗(yàn) N 8 1

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

??????????app.setupCOM.Timeout = 1;%接收超時(shí) 時(shí)間

??????????app.Lamp.Color = [0 1 0];

????????case 0

??????????app.Lamp.Color = [1 0 0];

??????????delete(app.setupCOM);%刪除串口

??????end

讀取并顯示：

y = zeros(2000, 1);%隨便定義一個(gè)存儲(chǔ)空間

??????while 1

????????if app.ReadDataButton.Value == 0

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

??????????return;%跳出循環(huán)

????????else

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

??????????data = read(app.setupCOM, 1, 'int8');%讀取一個(gè)字節(jié) 的數(shù)據(jù)

??????????y = circshift(y, 1);%存儲(chǔ)空間移位

??????????y(1) = data;

??????????plot(app.UIAxes, 1:500, y(1:500, 1));%實(shí)時(shí)顯示存儲(chǔ)的最近500個(gè)點(diǎn)

??????????app.DisplayEditField.Value = data;

??????????flush(app.setupCOM);

??????????pause(0.01);%暫停0.01s

????????end

??????end