def pressure(self):
        """
        Get barometric pressure in milibar

        :returns: The pressure in milibar as a int

        :example:

        >>> sensor = BMP180(gw)
        >>> sensor.load_calibration()
        >>> sensor.pressure()
        75216

        """
        ut = self.get_raw_temp()
        up = self.get_raw_pressure()
        x1 = ((ut - self.cal['AC6']) * self.cal['AC5']) >> 15
        x2 = (self.cal['MC'] << 11) // (x1 + self.cal['MD'])
        b5 = x1 + x2
        b6 = b5 - 4000
        x1 = (self.cal['B2'] * (b6 * b6) >> 12) >> 11
        x2 = (self.cal['AC2'] * b6) >> 11
        x3 = x1 + x2
        b3 = (((self.cal['AC1'] * 4 + x3) << self.mode) + 2) // 4
        x1 = (self.cal['AC3'] * b6) >> 13
        x2 = (self.cal['B1'] * ((b6 * b6) >> 12)) >> 16
        x3 = ((x1 + x2) + 2) >> 2
        b4 = (self.cal['AC4'] * (x3 + 32768)) >> 15
        b7 = (up - b3) * (50000 >> self.mode)
        if b7 < 0x80000000:
            p = (b7 * 2) // b4
        else:
            p = (b7 // b4) * 2
        x1 = (p >> 8) * (p >> 8)
        x1 = (x1 * 3038) >> 16
        x2 = (-7357 * p) >> 16
        p += (x1 + x2 + 3791) >> 4
        return p
Get barometric pressure in milibar

        :returns: The pressure in milibar as a int

        :example:

        >>> sensor = BMP180(gw)
        >>> sensor.load_calibration()
        >>> sensor.pressure()
        75216