every 2ms:


    ioctl(fd, FIONREAD, &bytes_avaiable);
    static int i=0;
    array[i]=bytes_avaiable;

    if (bytes_avaiable<=310 && i>=10 && array[i]==array[i-1] && array[i]==array[i-2]
            && array[i]==array[i-3] && array[i]!=0){
        
        iIn = read(fd, array_uart2, sizeof(array_uart2));
        aggiorna1();
    }

    i++;
    if (i==400){
        i=0;
    }



void cClassSerialLIB::aggiorna1(){
    int n_samples=0;
    int m_pos;

    unsigned char buffer[4000];
    for (int i=0;i<4000;i++)
        buffer[i]='\0';

    int counter=0;


for (int j=0;j<6000;j++){
   n_samples=array_uart2[j+7];//numero sample.
   int len_payload=array_uart2[j+3];
   m_pos=len_payload+5;
   if (array_uart2[j]=='M' && array_uart2[j+1]=='A'&& array_uart2[j+2]=='M'&& array_uart2[j+5]==128 && array_uart2[j+m_pos]=='m'/*&& Buffer_temp[j+6]==7*/){
      qDebug("\t Sequence Number %d,%d,%d,%d\t",array_uart2[9],array_uart2[10],array_uart2[11],array_uart2[12]);
      counter=0;
      for (int i=0;i<4000;i++)
           buffer[i]=array_uart2[i];


      QString str="";
      QString temp="";
      int num_byte=n_samples*3/2; //numero_byte
      for(int i=j+13; i<j+num_byte+13; i+=3){
          int b0_msb= buffer[i];//8bit
          unsigned short shift_dx_b0msb = b0_msb<<4;
          int b0_lsb= buffer[i+1] & 0xF0;//4bit
          unsigned short shift_dx_b0lsb = b0_lsb>>4;
          unsigned short first_sample=shift_dx_b0msb|shift_dx_b0lsb;
          int b1_msb= buffer[i+1] & 0x0F;//4bit
          unsigned short shift_dx_b1msb = b1_msb<<8;
          int b1_lsb= buffer[i+2];			//8bit
          unsigned short shift_dx_b1lsb = b1_lsb;//>>4;
          unsigned short second_sample=shift_dx_b1msb|shift_dx_b1lsb;
          //str="";//gius
          str = QString("%1,%2").arg(first_sample).arg(second_sample);
          temp.append(str);
          temp.append(", ");
      }//chiusura for


      qDebug()<<temp;
      for (int i=0;i<6000;i++)
                array_uart2[i]='\0';

}//chiusura if


    else{
        counter++;
       }


  }
  qDebug()<<counter;
}