Gets the compensated pressure in Pascals.

def read_pressure(self):
        """Gets the compensated pressure in Pascals."""
        UT = self.read_raw_temp()
        UP = self.read_raw_pressure()
        # Datasheet values for debugging:
        #UT = 27898
        #UP = 23843
        # Calculations below are taken straight from section 3.5 of the datasheet.
        # Calculate true temperature coefficient B5.
        X1 = ((UT - self.cal_AC6) * self.cal_AC5) >> 15
        X2 = (self.cal_MC << 11) // (X1 + self.cal_MD)
        B5 = X1 + X2
        self.logger.debug('B5 = {0}', B5)
        # Pressure Calculations
        B6 = B5 - 4000
        self.logger.debug('B6 = {0}', B6)
        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
        self.logger.debug('B3 = {0}', B3)
        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
        self.logger.debug('B4 = {0}', B4)
        B7 = (UP - B3) * (50000 >> self._mode)
        self.logger.debug('B7 = {0}', B7)
        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 = p + ((X1 + X2 + 3791) >> 4)
        self.logger.debug('Pressure {0} Pa', p)
        return p/100