Error using serial/fopen (line 72) MATLAB - matlab

Question

I am using a pressure sensor D6F-PH to measure the pressure difference. This is my Arduino code that I wrote to get the values from the sensor.
#include "Wire.h"
#define addrs 0x6C // I2C bus address
int P;
int I;
float T;c
int initialize(int i2c_addr)
{
//INITIALIZATION AFTER POWER UP
Wire.beginTransmission(i2c_addr);
Wire.write(0x0B);
Wire.write(0x00);
int x = Wire.endTransmission();
return x;
}
int pressure(int i2c_addr)
{
//MCU MODE
Wire.beginTransmission(i2c_addr);
Wire.write(0x00);
Wire.write(0xD0); // reg 0 - address register high byte
// Wire.write(0x51); // reg 1 - address register low byte
Wire.write(0x40); // reg 1 - address register low byte
Wire.write(0x18); // reg 2 - serial control register - indicate # bytes among others (page 7 bottom)
Wire.write(0x06); // reg 3 - value to be written to SENS control register
int x = Wire.endTransmission();
delay(33);
//WRITE
Wire.beginTransmission(i2c_addr);
Wire.write(0x00);
Wire.write(0xD0);
Wire.write(0x51);
Wire.write(0x2C);
x = Wire.endTransmission();
//READ
Wire.beginTransmission(i2c_addr);
Wire.write(0x07);
x = Wire.endTransmission();
Wire.requestFrom(i2c_addr, 2);
byte hibyte = Wire.read();
byte lobyte = Wire.read();
long raw = word( hibyte, lobyte);
//Serial.print("raw pressure:\t ");
Serial.println(raw);
// D6F-PH5050AD3 ==> rangeMode=500 ==> int rd_pressure = ((raw - 1024) * rangeMode * 2 / 60000L) - rangeMode
// D6F-PH0505AD3 ==> rangeMode=50 ==> int rd_pressure = ((raw - 1024) * rangeMode * 2 / 60000L) - rangeMode
// D6F-PH0025AD1 ==> rangeMode=250 ==> int rd_pressure=(raw - 1024) * rangeMode / 60000L
//int rangeMode = 50;
int rangeMode = 250;
int rd_pressure = (raw - 1024) * rangeMode / 60000L;
//int rd_pressure = ((raw - 1024) * rangeMode * 10/60000L) - rangeMode;
return rd_pressure;
}
float temperature(int i2c_addr)
{
//MCU MODE
Wire.beginTransmission(i2c_addr);
Wire.write(0x00);
Wire.write(0xD0); // reg 0 - address register high byte
// Wire.write(0x51); // reg 1 - address register low byte
Wire.write(0x40); // reg 1 - address register low byte
Wire.write(0x18); // reg 2 - serial control register - indicate # bytes among others (page 7 bottom)
Wire.write(0x06); // reg 3 - value to be written to SENS control register
int x = Wire.endTransmission();
delay(33);
//WRITE
Wire.beginTransmission(i2c_addr);
Wire.write(0x00);
Wire.write(0xD0);
Wire.write(0x61);
Wire.write(0x2C);
x = Wire.endTransmission();
//READ
Wire.beginTransmission(i2c_addr);
Wire.write(0x07);
x = Wire.endTransmission();
Wire.requestFrom(i2c_addr, 2);
byte hibyte = Wire.read();
byte lobyte = Wire.read();
long raw = word( hibyte, lobyte);
//Serial.print("raw temperature:\t ");
//Serial.println(raw);
int temp = round((float)(raw - 10214) / 3.739); // this is the temperature multiplied by 10...
return (temp / 10.0); // ...and the function returs the float
temperature with 0.1°C resolution
}
void setup()
{ // Open serial communications
Wire.begin();
Serial.begin(9600);
I = initialize (addrs); // start wire connection
}
void loop()
{
P = pressure(addrs);
Serial.print("pressure:\t ");
Serial.println(P);
T = temperature(addrs);
Serial.print("temperature:\t ");
Serial.println(T);
delay(300); //delay for 30 seconds
}
I can measure the pressure and the temperature from the arduino uno board using the Serial Monitor.
When I try to Retrieve the data using MATLAB I am unable to do so.
s=serial('COM6','BaudRate',9600);
fopen(s);
This is the error message that I get when I try to open the port : Error using serial/fopen (line 72)
Open failed: Cannot connect to the COM2 port. Possible reasons are another
application is connected to the port or the port does not exist.
I have checked the COM port number and also used the delete(instrfindall); command but to no avail.
Please help

Answer 1

Resolved. I needed to close the Serial Monitor before creating a connection with MATLAB.