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发表于 2015-6-21 15:13:46
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串口通信
clear all
num=1000;
s=serial('COM1','BaudRate',4800,'Parity','none','DataBits',8,'StopBits',1);
fopen(s);
for j=1:num
fwrite(s,1);
high=fread(s,3) ;%从串行口读入3个数据
y(num)=high(1)*256*256+high(2)*256+high(3)-65535;
for i=1:num-1
y(i)=y(1+i);
end
x=1:1:num;
plot(x,y,'r-');
axis([0 num -10 1]);
grid on
pause(0.00001);
end
fclose(s)
delete(s); % 删除内存中的串口设备对象
clear s; % 清除工作空间中的串口设备对象
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