MATLAB串口通信

clear all;

close all;

clc;

dt = 0.05;

xlength=50;

length = int16(xlength/dt*0.8);

t=zeros(1,length);

m=zeros(5,length);

p = plot(t,m,'EraseMode','background','MarkerSize',5);

x=-1*xlength*0.9;

axis([x x+xlength -2.5 2.5]);

s = serial('COM3', 'baudrate', 4800);

s.InputBufferSize = 1048576; %1mb的缓冲区

fopen(s);

grid on;

n=1000;

ratio=63;

%pause(5);

eva = 0;

for i=1:100

    ax1 = fread(s,1,'int8')/ratio;

    ay1 = fread(s,1,'int8')/ratio;

    az1 = fread(s,1,'int8')/ratio;

    eva = eva + sqrtm(ax1*ax1+ay1*ay1+az1*az1);

end

    eva = eva/100;

    cha = 1-eva;

maxa = 1;

mina = 1;

count = 0;

for i=1:n

    t=[t(2:end) i*dt];

    ax1 = fread(s,1,'int8')/ratio;

    ay1 = fread(s,1,'int8')/ratio;

    az1 = fread(s,1,'int8')/ratio;

    a = sqrtm(ax1*ax1+ay1*ay1+az1*az1) + cha;

    if a>maxa

        maxa = a;

    elseif a<mina

        mina = a;

    end

    if a>1.15

        count = count+1;

    end

    clc;

    count

    m=[m(:,2:end) [ax1;ay1;az1;a;1.15]];

    set(p(1), 'XData', t, 'YData', m(1,:));

    set(p(2), 'XData', t, 'YData', m(2,:));

    set(p(3), 'XData', t, 'YData', m(3,:));

    set(p(4), 'XData', t, 'YData', m(4,:));

    set(p(5), 'XData', t, 'YData', m(5,:));

    drawnow;

    x=x+dt;

    axis([x x+xlength -2.5 2.5]);

end