matlab读取串口数据并显示曲线的实现示例

时间:2021-04-03 人气:0

matlab程序读取单片机通过串口传来的IMU角度数据，并用曲线显示出来。

上传的值为float型，每个数据后有回车符。范围90~-90

主文件 serial_test2.m

%%
clc;
 
global t;
global x;
global m;
global ii;
 
t = [0];
m = [0];
ii = 0;
x = -100;
p = plot(t,m,'EraseMode','background','MarkerSize',5);
axis([x-200 x+200 -90 90]);
grid on;
 
%%
 
try
  s=serial('com4');
catch
  error('cant serial');
end
set(s,'BaudRate', 115200,'DataBits',8,'StopBits',1,'Parity','none','FlowControl','none');
s.BytesAvailableFcnMode = 'terminator';
s.BytesAvailableFcn = {@callback,p};
 
fopen(s);
 
pause;
fclose(s);
delete(s);
clear s
close all;
clear all;

回调函数 callback.m

%%
function callback(s, BytesAvailable,p)
  
  global t;
  global x;
  global m;
  global ii;
 
  out = fscanf(s);
  data = str2num(out)
  
  t = [t ii];
  m = [m data];
  set(p, 'XData',t,'YData',m(1,:));
  
  drawnow
  x = x + 1;
  axis([x-200 x+200 -90 90]);
  ii=ii+1;
end

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