clc
close all;

t=[0];
m=[0;0;0;0]
p = plot(t,m)

buf = [];

x=0;
legend('acc_x','acc_y','acc_z','dong')
grid on;
set(gcf,'unit','normalized','position',[0.2,0.2,0.64,0.7]);

delete(instrfindall('Type','serial'));%清理串口
object = serial('com7','BaudRate',115200);%配置串口
fopen(object);

state = 0;
Len = 0;
Lenf = 0;

% for i=1:shuliang
while true
    data=fread(object,1);%读取数据
    buf = [buf data];
    switch state
        case 0
            if length(buf)>=5
               if  buf(1)==170 && buf(2)==187 && buf(3)==204
                   Len = buf(4);
                   Lenf = 255 - buf(5);
                   if Len==Lenf
                      state = 1;
                   else
                       buf(1) = [];
                   end
               else
                   buf(1) = [];
               end
            end
        case 1
            if length(buf)>=Len
              ver = 0;
               for i=1:(Len-1)
                   ver = ver + buf(i);
               end
               ver = mod(ver,256);
%                disp(ver);
%                disp(buf(Len));
               disp(buf);
               if ver==buf(Len)
                   
                   
%                  buf = buf(Len:end);
                   buf = []
               else
                   buf(1) = [];
               end
               state = 0;
            end
        otherwise
            state = 0;
    end
%     t=[t i];
%     drawnow
%     if i>250
%         x=x+1; 
%     end
%     axis([x x+250 -10 10]); 
end

fclose(object);
delete(object);
clear object;