Low voltage digital temperature sensor

Dependencies:   X_NUCLEO_COMMON ST_INTERFACES

Dependents:   X_NUCLEO_IKS01A3 X_NUCLEO_IKS01A3 X_NUCLEO_IKS01A3

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STTS751Sensor.cpp

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00001 /**
00002  ******************************************************************************
00003  * @file    STTS751Sensor.cpp
00004  * @author  SRA
00005  * @version V1.0.0
00006  * @date    February 2019
00007  * @brief   Implementation of a STTS751 temperature sensor.
00008  ******************************************************************************
00009  * @attention
00010  *
00011  * <h2><center>&copy; COPYRIGHT(c) 2019 STMicroelectronics</center></h2>
00012  *
00013  * Redistribution and use in source and binary forms, with or without modification,
00014  * are permitted provided that the following conditions are met:
00015  *   1. Redistributions of source code must retain the above copyright notice,
00016  *      this list of conditions and the following disclaimer.
00017  *   2. Redistributions in binary form must reproduce the above copyright notice,
00018  *      this list of conditions and the following disclaimer in the documentation
00019  *      and/or other materials provided with the distribution.
00020  *   3. Neither the name of STMicroelectronics nor the names of its contributors
00021  *      may be used to endorse or promote products derived from this software
00022  *      without specific prior written permission.
00023  *
00024  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
00025  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00026  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
00027  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
00028  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00029  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, 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 
00039 /* Includes ------------------------------------------------------------------*/
00040 
00041 #include "STTS751Sensor.h"
00042 
00043 
00044 /* Class Implementation ------------------------------------------------------*/
00045 
00046 /** Constructor
00047  * @param i2c object of an helper class which handles the I2C peripheral
00048  * @param address the address of the component's instance
00049  * @param int_pin the interrupt pin
00050  */
00051 STTS751Sensor::STTS751Sensor(DevI2C *i2c, uint8_t address, PinName int_pin) : _dev_i2c(i2c), _address(address), _int_irq(int_pin)
00052 {
00053     assert(i2c);
00054     _reg_ctx.write_reg = STTS751_io_write;
00055     _reg_ctx.read_reg = STTS751_io_read;
00056     _reg_ctx.handle = (void *)this;
00057 }
00058 
00059 /**
00060  * @brief  Initializing the component
00061  * @param  init pointer to device specific initalization structure
00062  * @retval 0 in case of success, an error code otherwise
00063  */
00064 int STTS751Sensor::init(void *init)
00065 {
00066     /* Disable EVENT pin of SMBus. */
00067     if (stts751_pin_event_route_set(&_reg_ctx,  PROPERTY_ENABLE) != 0) {
00068         return 1;
00069     }
00070 
00071     /* Set default ODR */
00072     _last_odr = 1.0f;
00073 
00074     /* Set the resolution to the maximum allowed value */
00075     if (stts751_resolution_set(&_reg_ctx, STTS751_12bit) != 0) {
00076         return 1;
00077     }
00078 
00079     /* Put the component in standby mode. */
00080     if (stts751_temp_data_rate_set(&_reg_ctx, STTS751_TEMP_ODR_OFF) != 0) {
00081         return 1;
00082     }
00083 
00084     _is_enabled = 0;
00085 
00086     return 0;
00087 }
00088 
00089 /**
00090  * @brief  Get WHO_AM_I value
00091  * @param  id the WHO_AM_I value
00092  * @retval 0 in case of success, an error code otherwise
00093  */
00094 int STTS751Sensor::read_id(uint8_t *id)
00095 {
00096     stts751_id_t buf;
00097 
00098     if (stts751_device_id_get(&_reg_ctx, &buf) != 0) {
00099         return 1;
00100     }
00101 
00102     *id = buf.manufacturer_id;
00103 
00104     return 0;
00105 }
00106 
00107 /**
00108  * @brief  Enable the STTS751 temperature sensor
00109  * @retval 0 in case of success, an error code otherwise
00110  */
00111 int STTS751Sensor::enable()
00112 {
00113     /* Check if the component is already enabled */
00114     if (_is_enabled == 1U) {
00115         return 0;
00116     }
00117 
00118     /* Power on the component and set the odr. */
00119     if (set_odr(_last_odr) != 0) {
00120         return 1;
00121     }
00122 
00123     _is_enabled = 1;
00124 
00125     return 0;
00126 }
00127 
00128 /**
00129  * @brief  Disable the STTS751 temperature sensor
00130  * @retval 0 in case of success, an error code otherwise
00131  */
00132 int STTS751Sensor::disable()
00133 {
00134     /* Check if the component is already disabled */
00135     if (_is_enabled == 0U) {
00136         return 0;
00137     }
00138 
00139     /* Save the current odr. */
00140     if (get_odr(&_last_odr) != 0) {
00141         return 1;
00142     }
00143 
00144     /* Put the component in standby mode. */
00145     if (stts751_temp_data_rate_set(&_reg_ctx, STTS751_TEMP_ODR_OFF) != 0) {
00146         return 1;
00147     }
00148 
00149     _is_enabled = 0;
00150 
00151     return 0;
00152 }
00153 
00154 /**
00155  * @brief  Get the STTS751 temperature sensor output data rate
00156  * @param  odr pointer where the output data rate is written
00157  * @retval 0 in case of success, an error code otherwise
00158  */
00159 int STTS751Sensor::get_odr(float *odr)
00160 {
00161     int ret = 0;
00162     stts751_odr_t odr_low_level;
00163 
00164     if (stts751_temp_data_rate_get(&_reg_ctx, &odr_low_level) != 0) {
00165         return 1;
00166     }
00167 
00168     switch (odr_low_level) {
00169         case STTS751_TEMP_ODR_OFF:
00170         case STTS751_TEMP_ODR_ONE_SHOT:
00171             *odr = 0.0f;
00172             break;
00173 
00174         case STTS751_TEMP_ODR_62mHz5:
00175             *odr = 0.0625f;
00176             break;
00177 
00178         case STTS751_TEMP_ODR_125mHz:
00179             *odr = 0.125f;
00180             break;
00181 
00182         case STTS751_TEMP_ODR_250mHz:
00183             *odr = 0.250f;
00184             break;
00185 
00186         case STTS751_TEMP_ODR_500mHz:
00187             *odr = 0.500f;
00188             break;
00189 
00190         case STTS751_TEMP_ODR_1Hz:
00191             *odr = 1.0f;
00192             break;
00193 
00194         case STTS751_TEMP_ODR_2Hz:
00195             *odr = 2.0f;
00196             break;
00197 
00198         case STTS751_TEMP_ODR_4Hz:
00199             *odr = 4.0f;
00200             break;
00201 
00202         case STTS751_TEMP_ODR_8Hz:
00203             *odr = 8.0f;
00204             break;
00205 
00206         case STTS751_TEMP_ODR_16Hz:
00207             *odr = 16.0f;
00208             break;
00209 
00210         case STTS751_TEMP_ODR_32Hz:
00211             *odr = 32.0f;
00212             break;
00213 
00214         default:
00215             ret = 1;
00216             break;
00217     }
00218 
00219     return ret;
00220 }
00221 
00222 /**
00223  * @brief  Set the STTS751 temperature sensor output data rate
00224  * @param  odr the output data rate value to be set
00225  * @retval 0 in case of success, an error code otherwise
00226  */
00227 int STTS751Sensor::set_odr(float odr)
00228 {
00229     stts751_odr_t new_odr;
00230     stts751_tres_t res;
00231 
00232     /* Get the current resolution */
00233     if (stts751_resolution_get(&_reg_ctx, &res) != 0) {
00234         return 1;
00235     }
00236 
00237     /* If the requested odr is 16Hz we cannot use the 12 bits resolution */
00238     if (odr == 16.0f && res == STTS751_12bit) {
00239         /* We force resolution to the maximum allowed value */
00240         if (stts751_resolution_set(&_reg_ctx, STTS751_11bit) != 0) {
00241             return 1;
00242         }
00243     }
00244 
00245     /* If the requested odr is 32Hz we cannot use the 12 bits and 11 bits resolutions */
00246     if (odr == 32.0f && (res == STTS751_12bit || res == STTS751_11bit)) {
00247         /* We force resolution to the maximum allowed value */
00248         if (stts751_resolution_set(&_reg_ctx, STTS751_10bit) != 0) {
00249             return 1;
00250         }
00251     }
00252 
00253     new_odr = (odr <= 0.0625f) ? STTS751_TEMP_ODR_62mHz5
00254               : (odr <= 0.125f) ? STTS751_TEMP_ODR_125mHz
00255               : (odr <= 0.25f) ? STTS751_TEMP_ODR_250mHz
00256               : (odr <= 0.5f) ? STTS751_TEMP_ODR_500mHz
00257               : (odr <= 1.0f) ? STTS751_TEMP_ODR_1Hz
00258               : (odr <= 2.0f) ? STTS751_TEMP_ODR_2Hz
00259               : (odr <= 4.0f) ? STTS751_TEMP_ODR_4Hz
00260               : (odr <= 8.0f) ? STTS751_TEMP_ODR_8Hz
00261               : (odr <= 16.0f) ? STTS751_TEMP_ODR_16Hz
00262               :                    STTS751_TEMP_ODR_32Hz;
00263 
00264     if (stts751_temp_data_rate_set(&_reg_ctx, new_odr) != 0) {
00265         return 1;
00266     }
00267 
00268     return 0;
00269 }
00270 
00271 /**
00272  * @brief  Get the STTS751 temperature value
00273  * @param  value pointer where the temperature value is written
00274  * @retval 0 in case of success, an error code otherwise
00275  */
00276 int STTS751Sensor::get_temperature(float *value)
00277 {
00278     int16_t raw_value = 0;
00279 
00280     /* Get the temperature */
00281     if (stts751_temperature_raw_get(&_reg_ctx, &raw_value) != 0) {
00282         return 1;
00283     }
00284 
00285     *value = stts751_from_lsb_to_celsius(raw_value);
00286 
00287     return 0;
00288 }
00289 
00290 /**
00291  * @brief  Get the STTS751 temperature data ready bit value
00292  * @param  status the status of data ready bit
00293  * @retval 0 in case of success, an error code otherwise
00294  */
00295 int STTS751Sensor::get_temp_drdy_status(uint8_t *status)
00296 {
00297     uint8_t val;
00298 
00299     if (stts751_flag_busy_get(&_reg_ctx, &val) != 0) {
00300         return 1;
00301     }
00302 
00303     if (val) {
00304         *status = 0;
00305     } else {
00306         *status = 1;
00307     }
00308 
00309     return 0;
00310 }
00311 
00312 /**
00313  * @brief  Set the STTS751 low temperature threshold value
00314  * @param  value the low temperature threshold to be set
00315  * @retval 0 in case of success, an error code otherwise
00316  */
00317 int STTS751Sensor::set_low_temp_thr(float value)
00318 {
00319     int16_t raw_value;
00320 
00321     raw_value = stts751_from_celsius_to_lsb(value);
00322 
00323     /* Set the temperature threshold */
00324     if (stts751_low_temperature_threshold_set(&_reg_ctx, raw_value) != 0) {
00325         return 1;
00326     }
00327 
00328     return 0;
00329 }
00330 
00331 /**
00332  * @brief  Set the STTS751 high temperature threshold value
00333  * @param  value the high temperature threshold to be set
00334  * @retval 0 in case of success, an error code otherwise
00335  */
00336 int STTS751Sensor::set_high_temp_thr(float value)
00337 {
00338     int16_t raw_value;
00339 
00340     raw_value = stts751_from_celsius_to_lsb(value);
00341 
00342     /* Set the temperature threshold */
00343     if (stts751_high_temperature_threshold_set(&_reg_ctx, raw_value) != 0) {
00344         return 1;
00345     }
00346 
00347     return 0;
00348 }
00349 
00350 /**
00351  * @brief  Get the STTS751 temperature limits status
00352  * @param  high_limit indicates that high temperature limit has been exceeded
00353  * @param  low_limit indicates that low temperature limit has been exceeded
00354  * @param  therm_limit indicates that therm temperature limit has been exceeded
00355  * @retval 0 in case of success, an error code otherwise
00356  */
00357 int STTS751Sensor::get_temp_limit_status(uint8_t *high_limit, uint8_t *low_limit, uint8_t *therm_limit)
00358 {
00359     stts751_status_t status;
00360 
00361     /* Read status register */
00362     if (stts751_status_reg_get(&_reg_ctx, &status) != 0) {
00363         return 1;
00364     }
00365 
00366     if(high_limit) {
00367         *high_limit = status.t_high;
00368     }
00369 
00370     if(low_limit) {
00371         *low_limit = status.t_low;
00372     }
00373 
00374     if(therm_limit) {
00375         *therm_limit = status.thrm;
00376     }
00377 
00378     return 0;
00379 }
00380 
00381 /**
00382  * @brief  Enable or disable interrupt on EVENT pin
00383  * @param  enable 0 disable the EVENT pin, 1 enable EVENT pin
00384  * @retval 0 in case of success, an error code otherwise
00385  */
00386 int STTS751Sensor::set_event_pin(uint8_t enable)
00387 {
00388     uint8_t state;
00389 
00390     /* The MASK1 bit in configuration register has inverted logic */
00391     if (enable == 0) {
00392         state = PROPERTY_ENABLE;
00393     } else {
00394         state = PROPERTY_DISABLE;
00395     }
00396 
00397     if (stts751_pin_event_route_set(&_reg_ctx,  state) != 0) {
00398         return 1;
00399     }
00400 
00401     return 0;
00402 }
00403 
00404 /**
00405  * @brief  Get the STTS751 register value
00406  * @param  reg address to be read
00407  * @param  data pointer where the value is written
00408  * @retval 0 in case of success, an error code otherwise
00409  */
00410 int STTS751Sensor::read_reg(uint8_t reg, uint8_t *data)
00411 {
00412     if (stts751_read_reg(&_reg_ctx, reg, data, 1) != 0) {
00413         return 1;
00414     }
00415 
00416     return 0;
00417 }
00418 
00419 /**
00420  * @brief  Set the STTS751 register value
00421  * @param  reg address to be written
00422  * @param  data value to be written
00423  * @retval 0 in case of success, an error code otherwise
00424  */
00425 int STTS751Sensor::write_reg(uint8_t reg, uint8_t data)
00426 {
00427     if (stts751_write_reg(&_reg_ctx, reg, &data, 1) != 0) {
00428         return 1;
00429     }
00430 
00431     return 0;
00432 }
00433 
00434 /**
00435  * @brief  Set the STTS751 One Shot Mode
00436  * @retval 0 in case of success, an error code otherwise
00437  */
00438 int STTS751Sensor::set_one_shot()
00439 {
00440     /* Start One Shot Measurement */
00441     if (stts751_temp_data_rate_set(&_reg_ctx, STTS751_TEMP_ODR_ONE_SHOT) != 0) {
00442         return 1;
00443     }
00444 
00445     return 0;
00446 }
00447 
00448 /**
00449  * @brief  Get the STTS751 One Shot Status
00450  * @param  status pointer to the one shot status (1 means measurements available, 0 means measurements not available yet)
00451  * @retval 0 in case of success, an error code otherwise
00452  */
00453 int STTS751Sensor::get_one_shot_status(uint8_t *status)
00454 {
00455     uint8_t busy;
00456 
00457     /* Get Busy flag */
00458     if (stts751_flag_busy_get(&_reg_ctx, &busy) != 0) {
00459         return 1;
00460     }
00461 
00462     if (busy) {
00463         *status = 0;
00464     } else {
00465         *status = 1;
00466     }
00467 
00468     return 0;
00469 }
00470 
00471 
00472 int32_t STTS751_io_write(void *handle, uint8_t WriteAddr, uint8_t *pBuffer, uint16_t nBytesToWrite)
00473 {
00474     return ((STTS751Sensor *)handle)->io_write(pBuffer, WriteAddr, nBytesToWrite);
00475 }
00476 
00477 int32_t STTS751_io_read(void *handle, uint8_t ReadAddr, uint8_t *pBuffer, uint16_t nBytesToRead)
00478 {
00479     return ((STTS751Sensor *)handle)->io_read(pBuffer, ReadAddr, nBytesToRead);
00480 }