function?callback（s?BytesAvailable?p）

global?t;
global?x;
global?m;
global?i;

out?=?fread（s?1）;???????????%以字符串類型讀取數據
data?=?（out/256）*10-5;????%字符串轉數字

t?=?[t?i];
m?=?[m?data];
set（p?‘XData‘?t?‘YData‘?m（1?:））;

drawnow
x?=?x?+?1;
axis（[x-5000?x+5000?0?2]）;
i?=?i?+?1;

if?i?==?5000
????fid?=?fopen（‘noAction.txt‘?‘wt‘）;
????for?j?=?1?:?5000
????????fprintf（fid?‘%.2f\n‘?m（j））;
????end
end