Send an array to an Arduino board and sending the data on the DAC

Projects Interfacing w/ Software on the Computer
1

Hello to all,

I have started a new project requiring I send data from Matlab into an Arduino DUE board via the USB port, in order to convert the array into a signal. I have taken care to format the data in 12 bits. If I save the data on an SD card, the Arduino reads it very well and manages to send the data out. However, when I send the exact data via the US port, the signal is not generated anymore. Here is my Arduino code:

#include <SPI.h>
#include <SD.h>
int v[800];

  int led = 13;
void setup() {
pinMode(led, OUTPUT);
  // put your setup code here, to run once:
  analogWriteResolution(12);
  Serial.begin(9600);
  for (int i = 0; i < 800; i++) {
  v[i] = 0;
  }

  int i = 0;
  if (!SD.begin(4)) {
    return;
  }
 }

void loop() {
  int i = 0;

  if (Serial.available() > 0)
  {
    if(Serial.peek() == 'c') { 
      Serial.read();
      }
      while (Serial.available() > 0) {
        digitalWrite(13, HIGH);
      Serial.read();
      v[i] = Serial.parseInt();  
      i++;       
  }
  i = 0;
  }
   else {  
             digitalWrite(13, LOW);
     for (int k = 0; k < 400; k++) {
    analogWrite(DAC0, v[k]);
    analogWrite(DAC1, v[k+400]);
    delayMicroseconds(1);
    Serial.println(v[k]);
  }
}
 digitalWrite(13, HIGH);
 delay(1000);
  digitalWrite(13, LOW);
  }

  // put your main code here, to run repeatedly:
 /* int l = sizeof(sl) / sizeof(*sl);
  for (int i = 0; i < l; i++) {
    analogWrite(DAC0, sl[i]);
    analogWrite(DAC1, sr[i]);
    //analogWrite(DAC1, v[9-i]);
    //Serial.println(s[i]);
    delayMicroseconds(1);
  }*/

Here is the Matlab code responsible for the data transfer:

s = serial('COM5', 'BaudRate', 9600);
fopen(s);
fprintf(s, '%c', 'c'); % data is coming
% send 1 element at a time as string
for i = 1:length(x)
fprintf(s, '%s', (x(i)));
end
fclose(s)

Can anybody help me?

Best regards,
Jean