504 lines
14 KiB
C
504 lines
14 KiB
C
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/**
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******************************************************************************
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* @file hts221.c
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* @author MEMS Application Team
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* @version V1.2.0
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* @date 11-February-2015
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* @brief This file provides a set of functions needed to manage the hts221.
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******************************************************************************
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* @attention
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*
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* <h2><center>© COPYRIGHT(c) 2015 STMicroelectronics</center></h2>
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. Neither the name of STMicroelectronics nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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******************************************************************************
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*/
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/* Includes ------------------------------------------------------------------*/
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#include "hts221.h"
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#include <math.h>
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/** @addtogroup BSP
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* @{
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*/
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/** @addtogroup Components
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* @{
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*/
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/** @addtogroup HTS221
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* @{
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*/
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static HUM_TEMP_StatusTypeDef HTS221_Init(HUM_TEMP_InitTypeDef *HTS221_Init);
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static HUM_TEMP_StatusTypeDef HTS221_Power_OFF(void);
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static HUM_TEMP_StatusTypeDef HTS221_ReadID(uint8_t *ht_id);
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static HUM_TEMP_StatusTypeDef HTS221_RebootCmd(void);
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static HUM_TEMP_StatusTypeDef HTS221_GetHumidity(float* pfData);
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static HUM_TEMP_StatusTypeDef HTS221_GetTemperature(float* pfData);
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/** @defgroup HTS221_Private_Variables HTS221_Private_Variables
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* @{
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*/
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HUM_TEMP_DrvTypeDef Hts221Drv =
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{
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HTS221_Init,
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HTS221_Power_OFF,
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HTS221_ReadID,
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HTS221_RebootCmd,
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0,
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0,
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0,
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0,
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0,
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HTS221_GetHumidity,
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HTS221_GetTemperature,
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NULL
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};
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/* ------------------------------------------------------- */
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/* Here you should declare the variable that implements */
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/* the internal struct of extended features of HTS221. */
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/* Then you must update the NULL pointer in the variable */
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/* of the extended features below. */
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/* See the example of LSM6DS3 in lsm6ds3.c */
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/* ------------------------------------------------------- */
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HUM_TEMP_DrvExtTypeDef Hts221Drv_ext =
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{
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HUM_TEMP_HTS221_COMPONENT, /* unique ID for HTS221 in the humidity and temperature driver class */
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NULL /* pointer to internal struct of extended features of HTS221 */
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};
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/* Temperature in degree for calibration */
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float T0_degC, T1_degC;
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/* Output temperature value for calibration */
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int16_t T0_out, T1_out;
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/* Humidity for calibration */
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float H0_rh, H1_rh;
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/* Output Humidity value for calibration */
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int16_t H0_T0_out, H1_T0_out;
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/**
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* @}
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*/
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static HUM_TEMP_StatusTypeDef HTS221_Power_On(void);
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static HUM_TEMP_StatusTypeDef HTS221_Calibration(void);
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/** @defgroup HTS221_Private_Functions HTS221_Private_Functions
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* @{
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*/
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/**
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* @brief HTS221 Calibration procedure
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* @retval HUM_TEMP_OK in case of success, an error code otherwise
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*/
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static HUM_TEMP_StatusTypeDef HTS221_Calibration(void)
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{
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/* Temperature Calibration */
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/* Temperature in degree for calibration ( "/8" to obtain float) */
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uint16_t T0_degC_x8_L, T0_degC_x8_H, T1_degC_x8_L, T1_degC_x8_H;
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uint8_t H0_rh_x2, H1_rh_x2;
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uint8_t tempReg[2] = {0, 0};
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if(HTS221_IO_Read(tempReg, HTS221_ADDRESS, HTS221_T0_degC_X8_ADDR, 1) != HUM_TEMP_OK)
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{
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return HUM_TEMP_ERROR;
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}
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T0_degC_x8_L = (uint16_t)tempReg[0];
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if(HTS221_IO_Read(tempReg, HTS221_ADDRESS, HTS221_T1_T0_MSB_X8_ADDR, 1) != HUM_TEMP_OK)
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{
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return HUM_TEMP_ERROR;
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}
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T0_degC_x8_H = (uint16_t) (tempReg[0] & 0x03);
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T0_degC = ((float)((T0_degC_x8_H << 8) | (T0_degC_x8_L))) / 8;
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if(HTS221_IO_Read(tempReg, HTS221_ADDRESS, HTS221_T1_degC_X8_ADDR, 1) != HUM_TEMP_OK)
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{
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return HUM_TEMP_ERROR;
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}
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T1_degC_x8_L = (uint16_t)tempReg[0];
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if(HTS221_IO_Read(tempReg, HTS221_ADDRESS, HTS221_T1_T0_MSB_X8_ADDR, 1) != HUM_TEMP_OK)
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{
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return HUM_TEMP_ERROR;
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}
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T1_degC_x8_H = (uint16_t) (tempReg[0] & 0x0C);
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T1_degC_x8_H = T1_degC_x8_H >> 2;
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T1_degC = ((float)((T1_degC_x8_H << 8) | (T1_degC_x8_L))) / 8;
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if(HTS221_IO_Read(tempReg, HTS221_ADDRESS, (HTS221_T0_OUT_L_ADDR | HTS221_I2C_MULTIPLEBYTE_CMD), 2) != HUM_TEMP_OK)
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{
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return HUM_TEMP_ERROR;
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}
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T0_out = ((((int16_t)tempReg[1]) << 8) + (int16_t)tempReg[0]);
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if(HTS221_IO_Read(tempReg, HTS221_ADDRESS, (HTS221_T1_OUT_L_ADDR | HTS221_I2C_MULTIPLEBYTE_CMD), 2) != HUM_TEMP_OK)
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{
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return HUM_TEMP_ERROR;
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}
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T1_out = ((((int16_t)tempReg[1]) << 8) + (int16_t)tempReg[0]);
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/* Humidity Calibration */
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/* Humidity in degree for calibration ( "/2" to obtain float) */
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if(HTS221_IO_Read(&H0_rh_x2, HTS221_ADDRESS, HTS221_H0_RH_X2_ADDR, 1) != HUM_TEMP_OK)
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{
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return HUM_TEMP_ERROR;
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}
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if(HTS221_IO_Read(&H1_rh_x2, HTS221_ADDRESS, HTS221_H1_RH_X2_ADDR, 1) != HUM_TEMP_OK)
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{
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return HUM_TEMP_ERROR;
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}
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if(HTS221_IO_Read(&tempReg[0], HTS221_ADDRESS, (HTS221_H0_T0_OUT_L_ADDR | HTS221_I2C_MULTIPLEBYTE_CMD),
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2) != HUM_TEMP_OK)
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{
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return HUM_TEMP_ERROR;
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}
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H0_T0_out = ((((int16_t)tempReg[1]) << 8) + (int16_t)tempReg[0]);
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if(HTS221_IO_Read(&tempReg[0], HTS221_ADDRESS, (HTS221_H1_T0_OUT_L_ADDR | HTS221_I2C_MULTIPLEBYTE_CMD),
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2) != HUM_TEMP_OK)
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{
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return HUM_TEMP_ERROR;
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}
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H1_T0_out = ((((int16_t)tempReg[1]) << 8) + (int16_t)tempReg[0]);
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H0_rh = ((float)H0_rh_x2) / 2;
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H1_rh = ((float)H1_rh_x2) / 2;
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return HUM_TEMP_OK;
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}
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/**
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* @brief Set HTS221 Initialization
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* @param HTS221_Init the configuration setting for the HTS221
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* @retval HUM_TEMP_OK in case of success, an error code otherwise
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*/
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static HUM_TEMP_StatusTypeDef HTS221_Init(HUM_TEMP_InitTypeDef *HTS221_Init)
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{
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uint8_t tmp = 0x00;
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/* Configure the low level interface ---------------------------------------*/
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if(HTS221_IO_Init() != HUM_TEMP_OK)
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{
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return HUM_TEMP_ERROR;
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}
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if(HTS221_Power_On() != HUM_TEMP_OK)
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{
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return HUM_TEMP_ERROR;
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}
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if(HTS221_Calibration() != HUM_TEMP_OK)
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{
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return HUM_TEMP_ERROR;
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}
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if(HTS221_IO_Read(&tmp, HTS221_ADDRESS, HTS221_CTRL_REG1_ADDR, 1) != HUM_TEMP_OK)
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{
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return HUM_TEMP_ERROR;
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}
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/* Output Data Rate selection */
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tmp &= ~(HTS221_ODR_MASK);
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tmp |= HTS221_Init->OutputDataRate;
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if(HTS221_IO_Write(&tmp, HTS221_ADDRESS, HTS221_CTRL_REG1_ADDR, 1) != HUM_TEMP_OK)
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{
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return HUM_TEMP_ERROR;
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}
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HTS221_IO_ITConfig();
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return HUM_TEMP_OK;
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}
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/**
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* @brief Read ID address of HTS221
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* @param ht_id the pointer where the ID of the device is stored
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* @retval HUM_TEMP_OK in case of success, an error code otherwise
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*/
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static HUM_TEMP_StatusTypeDef HTS221_ReadID(uint8_t *ht_id)
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{
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if(!ht_id)
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{
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return HUM_TEMP_ERROR;
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}
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return HTS221_IO_Read(ht_id, HTS221_ADDRESS, HTS221_WHO_AM_I_ADDR, 1);
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}
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/**
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* @brief Reboot memory content of HTS221
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* @retval HUM_TEMP_OK in case of success, an error code otherwise
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*/
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static HUM_TEMP_StatusTypeDef HTS221_RebootCmd(void)
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{
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uint8_t tmpreg;
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/* Read CTRL_REG2 register */
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if(HTS221_IO_Read(&tmpreg, HTS221_ADDRESS, HTS221_CTRL_REG2_ADDR, 1) != HUM_TEMP_OK)
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{
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return HUM_TEMP_ERROR;
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}
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/* Enable or Disable the reboot memory */
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tmpreg |= HTS221_BOOT_REBOOTMEMORY;
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/* Write value to MEMS CTRL_REG2 regsister */
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if(HTS221_IO_Write(&tmpreg, HTS221_ADDRESS, HTS221_CTRL_REG2_ADDR, 1) != HUM_TEMP_OK)
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{
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return HUM_TEMP_ERROR;
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}
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return HUM_TEMP_OK;
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}
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/**
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* @brief Read HTS221 output register, and calculate the humidity
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* @param pfData the pointer to data output
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* @retval HUM_TEMP_OK in case of success, an error code otherwise
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*/
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static HUM_TEMP_StatusTypeDef HTS221_GetHumidity(float* pfData)
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{
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int16_t H_T_out, humidity_t;
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uint8_t tempReg[2] = {0, 0};
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uint8_t tmp = 0x00;
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float H_rh;
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if(HTS221_IO_Read(&tmp, HTS221_ADDRESS, HTS221_CTRL_REG1_ADDR, 1) != HUM_TEMP_OK)
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{
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return HUM_TEMP_ERROR;
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}
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/* Output Data Rate selection */
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tmp &= (HTS221_ODR_MASK);
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if(tmp == 0x00)
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{
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if(HTS221_IO_Read(&tmp, HTS221_ADDRESS, HTS221_CTRL_REG2_ADDR, 1) != HUM_TEMP_OK)
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{
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return HUM_TEMP_ERROR;
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}
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/* Serial Interface Mode selection */
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tmp &= ~(HTS221_ONE_SHOT_MASK);
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tmp |= HTS221_ONE_SHOT_START;
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if(HTS221_IO_Write(&tmp, HTS221_ADDRESS, HTS221_CTRL_REG2_ADDR, 1) != HUM_TEMP_OK)
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{
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return HUM_TEMP_ERROR;
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}
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do
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{
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if(HTS221_IO_Read(&tmp, HTS221_ADDRESS, HTS221_STATUS_REG_ADDR, 1) != HUM_TEMP_OK)
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{
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return HUM_TEMP_ERROR;
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}
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}
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while(!(tmp && 0x02));
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}
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if(HTS221_IO_Read(&tempReg[0], HTS221_ADDRESS, (HTS221_HUMIDITY_OUT_L_ADDR | HTS221_I2C_MULTIPLEBYTE_CMD),
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2) != HUM_TEMP_OK)
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{
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return HUM_TEMP_ERROR;
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}
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H_T_out = ((((int16_t)tempReg[1]) << 8) + (int16_t)tempReg[0]);
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H_rh = ( float )(((( H_T_out - H0_T0_out ) * ( H1_rh - H0_rh )) / ( H1_T0_out - H0_T0_out )) + H0_rh );
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// Truncate to specific number of decimal digits
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humidity_t = (uint16_t)(H_rh * pow(10, HUM_DECIMAL_DIGITS));
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*pfData = ((float)humidity_t) / pow(10, HUM_DECIMAL_DIGITS);
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// Prevent data going below 0% and above 100% due to linear interpolation
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if ( *pfData < 0.0f ) *pfData = 0.0f;
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if ( *pfData > 100.0f ) *pfData = 100.0f;
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return HUM_TEMP_OK;
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}
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/**
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* @brief Read HTS221 output register, and calculate the temperature
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* @param pfData the pointer to data output
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* @retval HUM_TEMP_OK in case of success, an error code otherwise
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*/
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static HUM_TEMP_StatusTypeDef HTS221_GetTemperature(float* pfData)
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{
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int16_t T_out, temperature_t;
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uint8_t tempReg[2] = {0, 0};
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uint8_t tmp = 0x00;
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float T_degC;
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if(HTS221_IO_Read(&tmp, HTS221_ADDRESS, HTS221_CTRL_REG1_ADDR, 1) != HUM_TEMP_OK)
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{
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return HUM_TEMP_ERROR;
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}
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/* Output Data Rate selection */
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tmp &= (HTS221_ODR_MASK);
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if(tmp == 0x00)
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{
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if(HTS221_IO_Read(&tmp, HTS221_ADDRESS, HTS221_CTRL_REG2_ADDR, 1) != HUM_TEMP_OK)
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{
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return HUM_TEMP_ERROR;
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}
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/* Serial Interface Mode selection */
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tmp &= ~(HTS221_ONE_SHOT_MASK);
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tmp |= HTS221_ONE_SHOT_START;
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if(HTS221_IO_Write(&tmp, HTS221_ADDRESS, HTS221_CTRL_REG2_ADDR, 1) != HUM_TEMP_OK)
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{
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return HUM_TEMP_ERROR;
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}
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do
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{
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if(HTS221_IO_Read(&tmp, HTS221_ADDRESS, HTS221_STATUS_REG_ADDR, 1) != HUM_TEMP_OK)
|
||
|
{
|
||
|
return HUM_TEMP_ERROR;
|
||
|
}
|
||
|
|
||
|
}
|
||
|
while(!(tmp && 0x01));
|
||
|
}
|
||
|
|
||
|
if(HTS221_IO_Read(&tempReg[0], HTS221_ADDRESS, (HTS221_TEMP_OUT_L_ADDR | HTS221_I2C_MULTIPLEBYTE_CMD),
|
||
|
2) != HUM_TEMP_OK)
|
||
|
{
|
||
|
return HUM_TEMP_ERROR;
|
||
|
}
|
||
|
|
||
|
T_out = ((((int16_t)tempReg[1]) << 8) + (int16_t)tempReg[0]);
|
||
|
|
||
|
T_degC = ((float)(T_out - T0_out)) / (T1_out - T0_out) * (T1_degC - T0_degC) + T0_degC;
|
||
|
|
||
|
temperature_t = (int16_t)(T_degC * pow(10, TEMP_DECIMAL_DIGITS));
|
||
|
|
||
|
*pfData = ((float)temperature_t) / pow(10, TEMP_DECIMAL_DIGITS);
|
||
|
|
||
|
return HUM_TEMP_OK;
|
||
|
}
|
||
|
|
||
|
|
||
|
/**
|
||
|
* @brief Exit the shutdown mode for HTS221
|
||
|
* @retval HUM_TEMP_OK in case of success, an error code otherwise
|
||
|
*/
|
||
|
static HUM_TEMP_StatusTypeDef HTS221_Power_On(void)
|
||
|
{
|
||
|
uint8_t tmpReg;
|
||
|
|
||
|
/* Read the register content */
|
||
|
if(HTS221_IO_Read(&tmpReg, HTS221_ADDRESS, HTS221_CTRL_REG1_ADDR, 1) != HUM_TEMP_OK)
|
||
|
{
|
||
|
return HUM_TEMP_ERROR;
|
||
|
}
|
||
|
|
||
|
/* Set the power down bit */
|
||
|
tmpReg |= HTS221_MODE_ACTIVE;
|
||
|
|
||
|
/* Write register */
|
||
|
if(HTS221_IO_Write(&tmpReg, HTS221_ADDRESS, HTS221_CTRL_REG1_ADDR, 1) != HUM_TEMP_OK)
|
||
|
{
|
||
|
return HUM_TEMP_ERROR;
|
||
|
}
|
||
|
|
||
|
return HUM_TEMP_OK;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* @brief Enter the shutdown mode for HTS221
|
||
|
* @retval HUM_TEMP_OK in case of success, an error code otherwise
|
||
|
*/
|
||
|
static HUM_TEMP_StatusTypeDef HTS221_Power_OFF(void)
|
||
|
{
|
||
|
uint8_t tmpReg;
|
||
|
|
||
|
/* Read the register content */
|
||
|
if(HTS221_IO_Read(&tmpReg, HTS221_ADDRESS, HTS221_CTRL_REG1_ADDR, 1) != HUM_TEMP_OK)
|
||
|
{
|
||
|
return HUM_TEMP_ERROR;
|
||
|
}
|
||
|
|
||
|
/* Reset the power down bit */
|
||
|
tmpReg &= ~(HTS221_MODE_ACTIVE);
|
||
|
|
||
|
/* Write register */
|
||
|
if(HTS221_IO_Write(&tmpReg, HTS221_ADDRESS, HTS221_CTRL_REG1_ADDR, 1) != HUM_TEMP_OK)
|
||
|
{
|
||
|
return HUM_TEMP_ERROR;
|
||
|
}
|
||
|
|
||
|
return HUM_TEMP_OK;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* @}
|
||
|
*/
|
||
|
|
||
|
/**
|
||
|
* @}
|
||
|
*/
|
||
|
|
||
|
/**
|
||
|
* @}
|
||
|
*/
|
||
|
|
||
|
/**
|
||
|
* @}
|
||
|
*/
|
||
|
|
||
|
|
||
|
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
|