Arduino Matlab绘图

我正在尝试将数据从我的Arduino Leonardo发送到Matlab然后绘制它 . 我已经尝试将正弦波传递给模拟输入，我能够在串行绘图仪上看到它 . 问题在于，每当我将数据发送到Matlab并绘制它时，绘图就不再是正弦波 .

这是我的Arduino代码，我在这个link的帮助下调整了它，以1kHz采样，这对串行绘图仪的结果影响不大 .

#define INTERVAL_LENGTH_US 1000UL

unsigned long previousMicros;
#define FASTADC 1
int recValue;
// defines for setting and clearing register bits
#ifndef cbi
#define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))
#endif
#ifndef sbi
#define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))
#endif
double t = 0;


void setup() {
  int start ;
  int i ;

#if FASTADC
  // set prescale to 16
  sbi(ADCSRA, ADPS2) ;
  cbi(ADCSRA, ADPS1) ;
  cbi(ADCSRA, ADPS0) ;
#endif

  Serial.begin(115200) ;
  while (1)
  {
    if (Serial.available() > 0)
    {
      recValue = Serial.read();

      if  (recValue == 1)            // If use will send value 1 from MATLAB
      { //delay(10);

        Serial.println("g");
        break;
      }

    }
  }


  void loop()
  {
    unsigned long currentMicros = micros();

    if ((currentMicros - previousMicros) >= INTERVAL_LENGTH_US)
    {
      previousMicros += INTERVAL_LENGTH_US;

      int val_a0 = analogRead(A0);
      int val_a1 = analogRead(A1);
      int val_a2 = analogRead(A2);
      int val_a3 = analogRead(A3);



      Serial.println(val_a0);


      Serial.println(val_a1);

      Serial.println(val_a2);


      Serial.println(val_a3);

    }
  }

编辑：我将电路板更改为UNO（不使用虚拟通信端口），我设法转移它 . 但是当我实时绘制它时，我设法绘制了一小段时间（700个样本） . 我知道Arduino连续发送正弦波，只是在matlab中，我只得到它的一部分 . 这是我的意思的截图：

Recieved sine

我在Matlab中用来接收和绘制它的代码如下：

clear all;
    s = serial('COM4', 'BaudRate', 250000); % setup comport
    fopen(s);
    t=[0]; v1=[0]; v2=[0];v2=[0];v3=[0]; v4=[0];                            % same as in Arduino IDE
    n=1;h1=0; h2=0; h3=0; h4=0; base=0.0; x=[];  reply = '1';

    % signalling to Arduino to start reading inputs
    servalue= input('Enter the value 1 to start reading :');
    pause(1);tic;
    fprintf(s,servalue);
    %Arduino will send an acknowledgment
    reply = fgetl(s);
    if(reply~='g')
        disp('fail')
    end
    %%%%%%%%%%%%%%%%%%setting the plots%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%5
    figure; subplot(411) ;
    h1 = plot( v1, 'r-');
    %animatedline(nan,nan); % Save handle to the line
    title('Channel 1');
    ylabel('Amplitude(V)');

    subplot(412); h2= plot( v2, 'r-');
    %animatedline(nan,nan); % Save handle to the line
    title('Channel 2');
    ylabel('Amplitude(V)');


    subplot(413); h3= plot( v3, 'r-');
    %animatedline(nan,nan); % Save handle to the line
    title('Channel 3');
    ylabel('Amplitude(V)');

    subplot(414); h4= plot( v4, 'r-');
    %animatedline(nan,nan); % Save handle to the line
    title('Channel 4');
    xlabel('Time (seconds)');
    ylabel('Amplitude(V)');
    %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%5

    while(toc<50)

        v1 = [v1, str2double(fgetl(s))*(5.0 / 1023.0)];
        v2 = [v2, str2double(fgetl(s))*(5.0 / 1023.0)];
        v3 = [v3, str2double(fgetl(s))*(5.0 / 1023.0)];
        v4 = [v4,str2double(fgetl(s))*(5.0 / 1023.0)];

        %% %%%%%%%updating plots%%%%%%%%%%%%%%%%%%

        set(h1,  'ydata', v1); % Update plot
        set(h2,  'ydata', v2); % Update plot
        set(h3,  'ydata', v3); % Update plot
        set(h4,  'ydata', v4); % Update plot
        drawnow;

        n=n+1;

    end
    fclose(s);

以下是4个 Channels 的回复：4 channels' response