EVM430-FR6043程序中USS_runAlgorithmsFixedPoint库函数有详细说明吗？

//! \brief The following API calculates Absolute ToF Upstream, Absolute ToF
//! Downstream, Delta ToF, Volume Flow Rate using fixed point math.
//! //! \n \n \b IMPORTANT: It is recommend to use this version of the API to
//! reduce power consumption numbers
//!
//! \n \n \b Note1: USS_initAlgorithms must be called prior to calling this
//! function.
//!
//! The API expects to have a Up stream (UPS) and Down stream (DNS) of size
//!	"sampleSize" in contiguous LEA memory where the first capture is assumed to
//! be UPS capture and the second capture is assumed to be DNS capture.
//!	Therefore, UPS and DNS capture depends on the type of capture the
//!	user select via sequenceSelection member in USS_Measurement_Configuration structure
//! For example: if sequenceSelection == USS_measurement_capture_sequence_ch0_ch1
//! then USS CH0 is assumed to be UPS capture and CH1 is assumed to be DNS capture
//! and vice versa for USS_measurement_capture_sequence_ch1_ch0
//! If API return message code USS_message_code_valid_results, then algorithms
//! result are valid.
//!
//!
//! \param[in] config  is a pointer to the USS SW Library user configuration
//! \param[in] results  is a pointer to the USS Algoriithms Result structure
//!
//! \return USS_message_code

extern USS_message_code USS_runAlgorithmsFixedPoint(
		USS_SW_Library_configuration *config,
		USS_Algorithms_Results_fixed_point *results);

//! \brief Contains USS SW Lib Algorithms Results
//!
typedef struct _USS_Algorithms_Results_fixed_point_
{
USS_message_code messageCode;
int32_t iq44DeltaTOF;
//!< Delta Time Of Flight calculation result
int32_t iq40TotalTOF_UPS;
//!< Upstream total Time Of Flight calculation result
int32_t iq40TotalTOF_DNS;
//!< Downstream total Time Of Flight calculation result
int32_t iq16VolumeFlowRate;
//!< Volume flow rate calculation result
int32_t iq16VolumeFlowRateNoCalib;
//!< Volume flow rate calculation result without VFR calibration
//!< (only used for VFR calibration)
int32_t iq16Temperature;
//!< Temperature calculation result
}USS_Algorithms_Results_fixed_point;

iq40TotalTOF_DNS应该是顺流时间
iq40TotalTOF_UPS应该是逆流时间
iq44DeltaTOF我理解是时间差，为什么不是逆流时间和顺流时间的差值呢？