admw1001_lut_data.h

00001 /*
00002 Copyright 2019 (c) Analog Devices, Inc.
00003 
00004 All rights reserved.
00005 
00006 Redistribution and use in source and binary forms, with or without
00007 modification, are permitted provided that the following conditions are met:
00008   - Redistributions of source code must retain the above copyright
00009     notice, this list of conditions and the following disclaimer.
00010   - Redistributions in binary form must reproduce the above copyright
00011     notice, this list of conditions and the following disclaimer in
00012     the documentation and/or other materials provided with the
00013     distribution.
00014   - Neither the name of Analog Devices, Inc. nor the names of its
00015     contributors may be used to endorse or promote products derived
00016     from this software without specific prior written permission.
00017   - The use of this software may or may not infringe the patent rights
00018     of one or more patent holders. This license does not release you
00019     from the requirement that you obtain separate licenses from these
00020     patent holders to use this software.
00021   - Use of the software either in source or binary form, must be run
00022     on or directly connected to an Analog Devices Inc. component.
00023 
00024 THIS SOFTWARE IS PROVIDED BY ANALOG DEVICES "AS IS" AND ANY EXPRESS OR
00025 IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, NON-INFRINGEMENT,
00026 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
00027 IN NO EVENT SHALL ANALOG DEVICES BE LIABLE FOR ANY DIRECT, INDIRECT,
00028 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
00029 LIMITED TO, INTELLECTUAL PROPERTY RIGHTS, PROCUREMENT OF SUBSTITUTE GOODS OR
00030 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
00031 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
00032 OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
00033 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00034 */
00035 
00036 /*!
00037  ******************************************************************************
00038  * @file:
00039  * @brief:  Look-Up Table data-type definitions for ADMW1001 API.
00040  *-----------------------------------------------------------------------------
00041  */
00042 
00043 #ifndef __ADMW1001_LUT_DATA_H__
00044 #define __ADMW1001_LUT_DATA_H__
00045 
00046 #include "admw_types.h"
00047 #include "admw1001_sensor_types.h"
00048 
00049 //lint --e{38} suppress "offset of symbol"
00050 
00051 /*! @addtogroup ADMW1001_Api
00052  *  @{
00053  */
00054 
00055 #ifdef __cplusplus
00056 extern "C" {
00057 #endif
00058 
00059 /*! LUT data validation signature */
00060 #define ADMW_LUT_SIGNATURE  0x4C555473
00061 
00062 /*! LUT data CRC-16-CCITT seed value */
00063 #define ADMW_LUT_CRC_SEED   0x4153
00064 
00065 /*! LUT maximum allowed size  */
00066 #define ADMW_LUT_MAX_SIZE 10240U
00067 
00068 #define MAX_LUT_NUM_ENTRIES 16
00069 /*! Linearisation look-up table / co-efficient list geometry */
00070 typedef enum {
00071     ADMW1001_LUT_GEOMETRY_RESERVED = 0x00,
00072     /**< reserved - for internal use only */
00073     ADMW1001_LUT_GEOMETRY_COEFFS = 0x01,
00074     /**< 1D/2D equation coefficient list */
00075     ADMW1001_LUT_GEOMETRY_NES_1D = 0x02,
00076     /**< 1-dimensional not-equally-spaced look-up table */
00077 } ADMW1001_LUT_GEOMETRY ;
00078 
00079 /*! Linearisation equation type */
00080 typedef enum {
00081     ADMW1001_LUT_EQUATION_POLYN,
00082     /**< Polynomial equation, typically used for Thermocouple and RTD
00083      * linearisation */
00084     ADMW1001_LUT_EQUATION_POLYNEXP,
00085     /**< Polynomial + exponential equation, typically used for Thermocouple
00086      * inverse linearisation */
00087     ADMW1001_LUT_EQUATION_QUADRATIC,
00088     /**< Quadratic linearisation equation, typically used for RTD
00089      * linearisation */
00090     ADMW1001_LUT_EQUATION_STEINHART,
00091     /**< Steinhart-Hart equation, typically used for Thermistor
00092      * linearisation */
00093     ADMW1001_LUT_EQUATION_LOGARITHMIC,
00094     /**< Beta-based logarithmic equation, typically used for Thermistor
00095      * linearisation */
00096     ADMW1001_LUT_EQUATION_BIVARIATE_POLYN,
00097     /**< Bi-variate polynomial equation, typically used for bridge pressure
00098      * sensor linearisation
00099      * @note 2nd-degree is the maximum currently supported
00100      */
00101     ADMW1001_LUT_EQUATION_COUNT,
00102     /**< Enum count value - for internal use only */
00103     ADMW1001_LUT_EQUATION_LUT,
00104     /**< Hard-coded Look-Up Table - for internal use only */
00105 } ADMW1001_LUT_EQUATION ;
00106 
00107 typedef enum {
00108     ADMW1001_LUT_TC_DIRECTION_FORWARD,
00109     /**< Thermocouple forward (mV to Celsius) linearisation
00110      *   Use this value by default for non-thermocouple sensors */
00111     ADMW1001_LUT_TC_DIRECTION_BACKWARD,
00112     /**< Thermocouple inverse (Celsius to mV) linearisation */
00113     ADMW1001_LUT_TC_DIRECTION_COUNT,
00114     /**< Enum count value - for internal use only */
00115 } ADMW1001_LUT_TC_DIRECTION ;
00116 
00117 /*! Linearisation data vector format */
00118 typedef enum {
00119     ADMW1001_LUT_DATA_TYPE_RESERVED = 0,
00120     /**< Reserved - for internal use only */
00121     ADMW1001_LUT_DATA_TYPE_FLOAT32 = 1,
00122     /**< Single-precision 32-bit floating-point */
00123     ADMW1001_LUT_DATA_TYPE_FLOAT64 = 2,
00124     /**< Double-precision 64-bit floating-point */
00125 } ADMW1001_LUT_DATA_TYPE ;
00126 
00127 /*! Struct for a list of coefficients to be used in an equation */
00128 typedef struct __attribute__ ((packed, aligned(4))){
00129     uint32_t nCoeffs;
00130     /**< number of coefficients */
00131     float32_t rangeMin;
00132     /**< look-up table range - minimum */
00133     float32_t rangeMax;
00134     /**< look-up table range - maximum */
00135     float64_t coeffs[];
00136     /**< C99 flexible array: sorted by ascending exponent in polynomials */
00137 } ADMW1001_LUT_COEFF_LIST;
00138 
00139 /*! Struct for a 1-dimensional equally-spaced look-up table */
00140 typedef struct __attribute__ ((packed, aligned(4))){
00141     uint32_t nElements;
00142     /**< number of elements. */
00143     float32_t initInputValue;
00144     /**< initial input value, corresponding to first table element */
00145     float32_t inputValueIncrement;
00146     /**< interval between successive input values */
00147     float32_t lut[];
00148     /**< C99 flexible array */
00149 } ADMW1001_LUT_1D_ES;
00150 
00151 /*! Struct for a 1-dimensional not-equally-spaced look-up table */
00152 typedef struct __attribute__ ((packed, aligned(4))){
00153     uint32_t nElements;
00154     /**< number of elements of each array. */
00155     float32_t lut[];
00156     /**< C99 flexible array, first X's array then Y's array*/
00157 } ADMW1001_LUT_1D_NES;
00158 
00159 /*! Macro to calculate the number of elements in
00160  * a @ref ADMW1001_LUT_1D_NES table */
00161 #define ADMW1001_LUT_1D_NES_NELEMENTS(_t) \
00162         ((_t).nElements * 2)
00163 
00164 /*! Macro to calculate the storage size in bytes of
00165  * a @ref ADMW1001_LUT_1D_NES table */
00166 #define ADMW1001_LUT_1D_NES_SIZE(_t)                              \
00167     (sizeof(_t) + (sizeof(float32_t) * ADMW1001_LUT_1D_NES_NELEMENTS(_t)))
00168 
00169 /*! Look-Up Table descriptor */
00170 typedef union __attribute__ ((packed, aligned(4))) {
00171     struct {
00172         uint16_t geometry   : 4;    /**< ADMW1001_LUT_GEOMETRY */
00173         uint8_t  channel    : 2;    /**< ADMW1001_ADC_CHANNEL */
00174         uint16_t equation   : 6;    /**< ADMW1001_LUT_EQUATION */
00175         uint16_t dir        : 4;    /**< ADMW1001_LUT_TC_DIRECTION */
00176         uint16_t sensor     : 12;   /**< ADMW1001_ADC_SENSOR_TYPE */
00177         uint16_t dataType   : 4;    /**< ADMW1001_LUT_DATA_TYPE */
00178         uint16_t length;            /**< Length (bytes) of table data section
00179                                         (excl. this header) */
00180     };
00181 } ADMW1001_LUT_DESCRIPTOR;
00182 
00183 /*! Look-Up Table geometry-specific data structures */
00184 typedef union {
00185     ADMW1001_LUT_COEFF_LIST          coeffList;
00186     /**< Data format for tables with ADMW1001_LUT_GEOMETRY_COEFFS geometry
00187      *   except where equation is ADMW1001_LUT_EQUATION_BIVARIATE_POLYN */
00188     ADMW1001_LUT_1D_NES              lut1dNes;
00189     /**< Data format for tables with ADMW1001_LUT_GEOMETRY_NES_1D geometry */
00190 } ADMW1001_LUT_TABLE_DATA ;
00191 
00192 /*! Look-Up Table structure */
00193 typedef struct __attribute__ ((packed, aligned(4))) {
00194     ADMW1001_LUT_DESCRIPTOR descriptor;
00195     /**< Look-Up Table descriptor */
00196     ADMW1001_LUT_TABLE_DATA  data;
00197     /**< Look-Up Table data */
00198 } ADMW1001_LUT_TABLE;
00199 
00200 /*! LUT data format versions */
00201 typedef struct __attribute__ ((packed, aligned(4))) {
00202     uint8_t major; /*!< Major version number */
00203     uint8_t minor; /*!< Minor version number */
00204 } ADMW1001_LUT_VERSION;
00205 
00206 /*! LUT data header structure */
00207 typedef struct __attribute__ ((packed, aligned(4))) {
00208     uint32_t signature;
00209     /**< Hard-coded signature value (@ref ADMW_LUT_SIGNATURE) */
00210     ADMW1001_LUT_VERSION version;
00211     /**< LUT data format version (@ref ADMW_LUT_VERSION) */
00212     uint16_t numTables;
00213     /**< Total number of tables */
00214     uint32_t totalLength;
00215     /**< Total length (in bytes) of all table descriptors and data
00216      *   (excluding this header)
00217      *   This, plus the header length, must not exceed ADMW_LUT_MAX_SIZE
00218      */
00219 } ADMW1001_LUT_HEADER;
00220 
00221 /*! LUT data top-level structure */
00222 typedef struct __attribute__ ((packed, aligned(4))) {
00223     ADMW1001_LUT_HEADER header;
00224     /*!< LUT data top-level header structure */
00225     ADMW1001_LUT_TABLE tables[1];
00226         /*!< Variable-length array of one-or-more look-up table structures */
00227 } ADMW1001_LUT;
00228 
00229 /*! Alternative top-level structure for raw LUT data representation
00230  *
00231  * @note This is intended to be used for encapsulating the storage of static
00232  *       LUT data declarations in C files.  The rawTableData can be cast
00233  *       to the ADMW_LUT type for further parsing/processing.
00234  */
00235 typedef struct __attribute__ ((packed, aligned(4))) {
00236     ADMW1001_LUT_HEADER header;
00237     /*!< LUT data top-level header structure */
00238     uint8_t rawTableData[];
00239     /*!< Variable-length byte array of look-up tables in raw binary format */
00240 } ADMW1001_LUT_RAW;
00241 
00242 #ifdef __cplusplus
00243 }
00244 #endif
00245 
00246 /*!
00247  * @}
00248  */
00249 
00250 #endif /* __ADMW1001_LUT_DATA_H__ */