function callback(s,BytesAvailable,p)
    global i;
    global t;
    global x;
    global m;
    
%     p = plot(t,m,...
%              \'EraseMode\',\'background\',\'MarkerSize\',5);
    out = fscanf(s) %read data from s

    data = str2num(out);
    if data>-2 & data < 2 %detect if data is legal
    %    disp(\'*******data comes! \n\');
    t=[t 0.01*2*pi*i];   %0 0.1 0.2 0.3.. %Matrix 1*(i+1), column is increasing
    m=[m data]; %Matrix 2*(i+1), 2row, i+1 column.
    %http://blog.csdn.net/sonictl
    %set(p(1),\'XData\',t,\'YData\',m(1,:))
    %set(p(2),\'XData\',t,\'YData\',m(2,:))
    set(p,\'XData\',t,\'YData\',m(1,:))

    %http://blog.csdn.net/sonictl
    drawnow
    x = x + 3.6/360*2*pi;   % x = x+0.1
    axis([x x+2*pi -1.5 1.5]);
    pause(0.1);
    i = i+1;
    end
    %http://blog.csdn.net/sonictl end

MATLAB动画显示串口数据【实例】

经过几天的学习，现在能实现串口数据的实时plot并记录在MATLAB变量中。

After a few days\' learning, we can implement thatreal-time plot the data from serial port.

先看一下演示的视频吧：(see demo video)

http://v.youku.com/v_show/id_XNDk2OTA1OTQw.html

升级版（双数据接收，绘图）：http://v.youku.com/v_show/id_XNDk3NzM0NzE2.html

The outline of the video:

演示视频大纲：
  1.介绍系统构成
  2.介绍板载C语言程序
  3.用Linux界面演示由MATLAB发送给目标板的命令，及理论返回值。
  4.介绍MATLAB本实例的m文件的主要功能，发送的命令，判断，画图
  5.演示整个MATLAB程序的实现效果

完成这个实例需要学习“MATLAB串口操作官方教程.pdf” 和 "Matlab中使用Plot函数动态画图方法总结"， 请点击。
To finish this subject, we need firstly learn"Official tutorial for MATLAB serial port operation "

板卡产生数据源程序（C语言）： The source code for generating original data on the TLL main board.
--------------------

#include"stdio.h"
#include"math.h"
#include"string.h"


#define pi 3.1415926


void delay(int a){
	int i,j,delay;
	for(i = 0 ;  i < 1000*a; i++){
		delay = 0;
		for(j = 0; j < 1000*a; j++){
			delay = delay+1;
		}
	}
}


int main(){
	float angle, x, y,rad;
	int i,N,dltime;
	angle = 0;
	//getchar();
	printf("input the num of circles, delay time: ");
	scanf("%d,%d", &N, &dltime);
	for (i = 0; i < 100*N ; i++){
		angle = angle + 3.6;
		rad = angle/180*pi;
		x = cos(rad);
		y = sin(rad);
		printf("%f \n", x);
		delay(dltime);
	}
	return 0;


}

--------------------------------------------

MATLAB 接收数据主程序serial-test.m：

The main program for receiving data in MATLAB:

clc;

%%
% Use EraseMode,draw dynamically. Change axis dynamically.
% Multi-Line drawing line
global i;
global t;
global x;
global m;
t = [0];                    % initialize
m = [0];                    % initialize
i = 0;
x = -pi ;

p = plot(t,m,...
   \'EraseMode\',\'background\',\'MarkerSize\',5);
axis([x x+2*pi -1.5 1.5]);   % x = [-1.5 pi, 0.5 pi]
grid on;

%%

s = serial(\'COM3\');     % creat serial port obj
set(s,\'BaudRate\',115200,\'DataBits\',8,\'StopBits\',1,...
    \'Parity\',\'none\',\'FlowControl\',\'none\');  % set properties for serial

s.BytesAvailableFcnMode = \'terminator\'; % byte number or terminator
s.BytesAvailableFcn = {@callback,p};   % {@mycallback,time}

fopen(s);

fprintf(s,\'cd /home\');
pause(1);           % pause function, 1s
fprintf(s,\'./matlab-serial\');
pause;           % pause function
fprintf(s,\'1,1\');

pause;      %right here is receiving the data and plot
fclose(s);
delete(s)
clear s
close all;
clear all;

--------------------------------------------

MATLAB 接收数据，判断，动态绘图，回调函数 callback.m:

The Callback function for receiving, judge, plotting in MATLAB.

Explore more:  Real-time plotting in MATLAB for the Three axis accelerometer data 

三轴力传感器数据在MATLAB中实时绘图显示：

http://blog.csdn.net/sonictl/article/details/8495973

--------------------------------------------