Deepti AST / Envt_Shield_API

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BSP/Components/hts221/hts221.c@0:9ac219c9a7df, 2014-08-14 (annotated)

Committer:
Deepti
Date:
Thu Aug 14 11:39:55 2014 +0000
Revision:
0:9ac219c9a7df
Environmental Shield API

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Deepti 0:9ac219c9a7df 1 /**
Deepti 0:9ac219c9a7df 2 ******************************************************************************
Deepti 0:9ac219c9a7df 3 * @file hts221.c
Deepti 0:9ac219c9a7df 4 * @author AST Robotics Team
Deepti 0:9ac219c9a7df 5 * @version V0.0.1
Deepti 0:9ac219c9a7df 6 * @date 08-April-2014
Deepti 0:9ac219c9a7df 7 * @brief This file provides a set of functions needed to manage the hts221.
Deepti 0:9ac219c9a7df 8 ******************************************************************************
Deepti 0:9ac219c9a7df 9 * @attention
Deepti 0:9ac219c9a7df 10 *
Deepti 0:9ac219c9a7df 11 * <h2><center>&copy; COPYRIGHT(c) 2014 STMicroelectronics</center></h2>
Deepti 0:9ac219c9a7df 12 *
Deepti 0:9ac219c9a7df 13 * Redistribution and use in source and binary forms, with or without modification,
Deepti 0:9ac219c9a7df 14 * are permitted provided that the following conditions are met:
Deepti 0:9ac219c9a7df 15 * 1. Redistributions of source code must retain the above copyright notice,
Deepti 0:9ac219c9a7df 16 * this list of conditions and the following disclaimer.
Deepti 0:9ac219c9a7df 17 * 2. Redistributions in binary form must reproduce the above copyright notice,
Deepti 0:9ac219c9a7df 18 * this list of conditions and the following disclaimer in the documentation
Deepti 0:9ac219c9a7df 19 * and/or other materials provided with the distribution.
Deepti 0:9ac219c9a7df 20 * 3. Neither the name of STMicroelectronics nor the names of its contributors
Deepti 0:9ac219c9a7df 21 * may be used to endorse or promote products derived from this software
Deepti 0:9ac219c9a7df 22 * without specific prior written permission.
Deepti 0:9ac219c9a7df 23 *
Deepti 0:9ac219c9a7df 24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
Deepti 0:9ac219c9a7df 25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
Deepti 0:9ac219c9a7df 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
Deepti 0:9ac219c9a7df 27 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
Deepti 0:9ac219c9a7df 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
Deepti 0:9ac219c9a7df 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
Deepti 0:9ac219c9a7df 30 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
Deepti 0:9ac219c9a7df 31 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
Deepti 0:9ac219c9a7df 32 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
Deepti 0:9ac219c9a7df 33 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Deepti 0:9ac219c9a7df 34 *
Deepti 0:9ac219c9a7df 35 ******************************************************************************
Deepti 0:9ac219c9a7df 36 */
Deepti 0:9ac219c9a7df 37 /* Includes ------------------------------------------------------------------*/
Deepti 0:9ac219c9a7df 38 #include "hts221.h"
Deepti 0:9ac219c9a7df 39 #include <math.h>
Deepti 0:9ac219c9a7df 40
Deepti 0:9ac219c9a7df 41 /** @addtogroup BSP
Deepti 0:9ac219c9a7df 42 * @{
Deepti 0:9ac219c9a7df 43 */
Deepti 0:9ac219c9a7df 44
Deepti 0:9ac219c9a7df 45 /** @addtogroup STM32F439_SENSITRON
Deepti 0:9ac219c9a7df 46 * @{
Deepti 0:9ac219c9a7df 47 */
Deepti 0:9ac219c9a7df 48
Deepti 0:9ac219c9a7df 49 /** @addtogroup HTS221
Deepti 0:9ac219c9a7df 50 * @{
Deepti 0:9ac219c9a7df 51 */
Deepti 0:9ac219c9a7df 52
Deepti 0:9ac219c9a7df 53
Deepti 0:9ac219c9a7df 54 /** @defgroup HTS221_Private_TypesDefinitions
Deepti 0:9ac219c9a7df 55 * @{
Deepti 0:9ac219c9a7df 56 */
Deepti 0:9ac219c9a7df 57
Deepti 0:9ac219c9a7df 58 /**
Deepti 0:9ac219c9a7df 59 * @}
Deepti 0:9ac219c9a7df 60 */
Deepti 0:9ac219c9a7df 61
Deepti 0:9ac219c9a7df 62 /** @defgroup HTS221_Private_Defines
Deepti 0:9ac219c9a7df 63 * @{
Deepti 0:9ac219c9a7df 64 */
Deepti 0:9ac219c9a7df 65
Deepti 0:9ac219c9a7df 66 /**
Deepti 0:9ac219c9a7df 67 * @}
Deepti 0:9ac219c9a7df 68 */
Deepti 0:9ac219c9a7df 69
Deepti 0:9ac219c9a7df 70 /** @defgroup HTS221_Private_Macros
Deepti 0:9ac219c9a7df 71 * @{
Deepti 0:9ac219c9a7df 72 */
Deepti 0:9ac219c9a7df 73
Deepti 0:9ac219c9a7df 74 /**
Deepti 0:9ac219c9a7df 75 * @}
Deepti 0:9ac219c9a7df 76 */
Deepti 0:9ac219c9a7df 77
Deepti 0:9ac219c9a7df 78 /** @defgroup HTS221_Private_Variables
Deepti 0:9ac219c9a7df 79 * @{
Deepti 0:9ac219c9a7df 80 */
Deepti 0:9ac219c9a7df 81
Deepti 0:9ac219c9a7df 82 HUM_TEMP_DrvTypeDef Hts221Drv =
Deepti 0:9ac219c9a7df 83 {
Deepti 0:9ac219c9a7df 84 HTS221_Init,
Deepti 0:9ac219c9a7df 85 HTS221_Power_OFF,
Deepti 0:9ac219c9a7df 86 HTS221_ReadID,
Deepti 0:9ac219c9a7df 87 HTS221_RebootCmd,
Deepti 0:9ac219c9a7df 88 HTS221_INT1InterruptConfig,
Deepti 0:9ac219c9a7df 89 HTS221_EnableIT,
Deepti 0:9ac219c9a7df 90 HTS221_DisableIT,
Deepti 0:9ac219c9a7df 91 HTS221_GetHumidity,
Deepti 0:9ac219c9a7df 92 HTS221_GetTemperature
Deepti 0:9ac219c9a7df 93 };
Deepti 0:9ac219c9a7df 94
Deepti 0:9ac219c9a7df 95
Deepti 0:9ac219c9a7df 96 /* Temperature in degree for calibration */
Deepti 0:9ac219c9a7df 97 float T0_degC, T1_degC;
Deepti 0:9ac219c9a7df 98
Deepti 0:9ac219c9a7df 99 /* Output temperature value for calibration */
Deepti 0:9ac219c9a7df 100 int16_t T0_out, T1_out;
Deepti 0:9ac219c9a7df 101
Deepti 0:9ac219c9a7df 102
Deepti 0:9ac219c9a7df 103 /* Humidity for calibration */
Deepti 0:9ac219c9a7df 104 float H0_rh, H1_rh;
Deepti 0:9ac219c9a7df 105
Deepti 0:9ac219c9a7df 106 /* Output Humidity value for calibration */
Deepti 0:9ac219c9a7df 107 int16_t H0_T0_out, H1_T0_out;
Deepti 0:9ac219c9a7df 108
Deepti 0:9ac219c9a7df 109
Deepti 0:9ac219c9a7df 110 /**
Deepti 0:9ac219c9a7df 111 * @}
Deepti 0:9ac219c9a7df 112 */
Deepti 0:9ac219c9a7df 113
Deepti 0:9ac219c9a7df 114 /** @defgroup HTS221_Private_FunctionPrototypes
Deepti 0:9ac219c9a7df 115 * @{
Deepti 0:9ac219c9a7df 116 */
Deepti 0:9ac219c9a7df 117 static void HTS221_Power_On(void);
Deepti 0:9ac219c9a7df 118
Deepti 0:9ac219c9a7df 119 static void HTS221_Calibration(void);
Deepti 0:9ac219c9a7df 120 /**
Deepti 0:9ac219c9a7df 121 * @}
Deepti 0:9ac219c9a7df 122 */
Deepti 0:9ac219c9a7df 123
Deepti 0:9ac219c9a7df 124 /** @defgroup HTS221_Private_Functions
Deepti 0:9ac219c9a7df 125 * @{
Deepti 0:9ac219c9a7df 126 */
Deepti 0:9ac219c9a7df 127
Deepti 0:9ac219c9a7df 128
Deepti 0:9ac219c9a7df 129
Deepti 0:9ac219c9a7df 130 /**
Deepti 0:9ac219c9a7df 131 * @brief HTS221 Calibration procedure.
Deepti 0:9ac219c9a7df 132 * @param None
Deepti 0:9ac219c9a7df 133 * @retval None
Deepti 0:9ac219c9a7df 134 */
Deepti 0:9ac219c9a7df 135 static void HTS221_Calibration(void)
Deepti 0:9ac219c9a7df 136 {
Deepti 0:9ac219c9a7df 137 /* Temperature Calibration */
Deepti 0:9ac219c9a7df 138 /* Temperature in degree for calibration ( "/8" to obtain float) */
Deepti 0:9ac219c9a7df 139 uint16_t T0_degC_x8_L, T0_degC_x8_H, T1_degC_x8_L, T1_degC_x8_H;
Deepti 0:9ac219c9a7df 140 uint8_t H0_rh_x2, H1_rh_x2;
Deepti 0:9ac219c9a7df 141 uint8_t tempReg[2] = {0,0};
Deepti 0:9ac219c9a7df 142
Deepti 0:9ac219c9a7df 143 HUM_TEMP_IO_Read(tempReg, HTS221_ADDRESS, HTS221_T0_degC_X8_ADDR, 1);
Deepti 0:9ac219c9a7df 144 T0_degC_x8_L = (uint16_t)tempReg[0];
Deepti 0:9ac219c9a7df 145
Deepti 0:9ac219c9a7df 146 HUM_TEMP_IO_Read(tempReg, HTS221_ADDRESS, HTS221_T1_T0_MSB_X8_ADDR, 1);
Deepti 0:9ac219c9a7df 147 T0_degC_x8_H = (uint16_t) (tempReg[0] & 0x03);
Deepti 0:9ac219c9a7df 148
Deepti 0:9ac219c9a7df 149 T0_degC = ((float)((T0_degC_x8_H<<8) | (T0_degC_x8_L)))/8;
Deepti 0:9ac219c9a7df 150
Deepti 0:9ac219c9a7df 151 HUM_TEMP_IO_Read(tempReg, HTS221_ADDRESS, HTS221_T1_degC_X8_ADDR, 1);
Deepti 0:9ac219c9a7df 152 T1_degC_x8_L = (uint16_t)tempReg[0];
Deepti 0:9ac219c9a7df 153
Deepti 0:9ac219c9a7df 154 HUM_TEMP_IO_Read(tempReg, HTS221_ADDRESS, HTS221_T1_T0_MSB_X8_ADDR, 1);
Deepti 0:9ac219c9a7df 155 T1_degC_x8_H = (uint16_t) (tempReg[0] & 0x0C);
Deepti 0:9ac219c9a7df 156 T1_degC_x8_H = T1_degC_x8_H >> 2;
Deepti 0:9ac219c9a7df 157
Deepti 0:9ac219c9a7df 158 T1_degC = ((float)((T1_degC_x8_H<<8) | (T1_degC_x8_L)))/8;
Deepti 0:9ac219c9a7df 159
Deepti 0:9ac219c9a7df 160 HUM_TEMP_IO_Read(tempReg, HTS221_ADDRESS, HTS221_T0_OUT_L_ADDR + 0x80, 2);
Deepti 0:9ac219c9a7df 161 T0_out = ((((int16_t)tempReg[1]) << 8)+(int16_t)tempReg[0]);
Deepti 0:9ac219c9a7df 162
Deepti 0:9ac219c9a7df 163 HUM_TEMP_IO_Read(tempReg, HTS221_ADDRESS, HTS221_T1_OUT_L_ADDR + 0x80, 2);
Deepti 0:9ac219c9a7df 164 T1_out = ((((int16_t)tempReg[1]) << 8)+(int16_t)tempReg[0]);
Deepti 0:9ac219c9a7df 165
Deepti 0:9ac219c9a7df 166 /* Humidity Calibration */
Deepti 0:9ac219c9a7df 167 /* Humidity in degree for calibration ( "/2" to obtain float) */
Deepti 0:9ac219c9a7df 168
Deepti 0:9ac219c9a7df 169 HUM_TEMP_IO_Read(&H0_rh_x2, HTS221_ADDRESS, HTS221_H0_RH_X2_ADDR, 1);
Deepti 0:9ac219c9a7df 170
Deepti 0:9ac219c9a7df 171 HUM_TEMP_IO_Read(&H1_rh_x2, HTS221_ADDRESS, HTS221_H1_RH_X2_ADDR, 1);
Deepti 0:9ac219c9a7df 172
Deepti 0:9ac219c9a7df 173 HUM_TEMP_IO_Read(&tempReg[0], HTS221_ADDRESS, HTS221_H0_T0_OUT_L_ADDR + 0x80, 2);
Deepti 0:9ac219c9a7df 174 H0_T0_out = ((((int16_t)tempReg[1]) << 8)+(int16_t)tempReg[0]);
Deepti 0:9ac219c9a7df 175
Deepti 0:9ac219c9a7df 176 HUM_TEMP_IO_Read(&tempReg[0], HTS221_ADDRESS, HTS221_H1_T0_OUT_L_ADDR + 0x80, 2);
Deepti 0:9ac219c9a7df 177 H1_T0_out = ((((int16_t)tempReg[1]) << 8)+(int16_t)tempReg[0]);
Deepti 0:9ac219c9a7df 178
Deepti 0:9ac219c9a7df 179 H0_rh = ((float)H0_rh_x2)/2;
Deepti 0:9ac219c9a7df 180 H1_rh = ((float)H1_rh_x2)/2;
Deepti 0:9ac219c9a7df 181 }
Deepti 0:9ac219c9a7df 182
Deepti 0:9ac219c9a7df 183
Deepti 0:9ac219c9a7df 184 /**
Deepti 0:9ac219c9a7df 185 * @brief Set HTS221 Initialization.
Deepti 0:9ac219c9a7df 186 * @param InitStruct: it contains the configuration setting for the HTS221.
Deepti 0:9ac219c9a7df 187 * @retval None
Deepti 0:9ac219c9a7df 188 */
Deepti 0:9ac219c9a7df 189 void HTS221_Init(HUM_TEMP_InitTypeDef *HTS221_Init)
Deepti 0:9ac219c9a7df 190 {
Deepti 0:9ac219c9a7df 191 uint8_t tmp = 0x00;
Deepti 0:9ac219c9a7df 192
Deepti 0:9ac219c9a7df 193 /* Configure the low level interface ---------------------------------------*/
Deepti 0:9ac219c9a7df 194 HUM_TEMP_IO_Init();
Deepti 0:9ac219c9a7df 195
Deepti 0:9ac219c9a7df 196 HTS221_Power_On();
Deepti 0:9ac219c9a7df 197
Deepti 0:9ac219c9a7df 198 HTS221_Calibration();
Deepti 0:9ac219c9a7df 199
Deepti 0:9ac219c9a7df 200 HUM_TEMP_IO_Read(&tmp, HTS221_ADDRESS, HTS221_CTRL_REG1_ADDR, 1);
Deepti 0:9ac219c9a7df 201
Deepti 0:9ac219c9a7df 202 /* Output Data Rate selection */
Deepti 0:9ac219c9a7df 203 tmp &= ~(HTS221_ODR_MASK);
Deepti 0:9ac219c9a7df 204 tmp |= HTS221_Init->OutputDataRate;
Deepti 0:9ac219c9a7df 205
Deepti 0:9ac219c9a7df 206 HUM_TEMP_IO_Write(&tmp, HTS221_ADDRESS, HTS221_CTRL_REG1_ADDR, 1);
Deepti 0:9ac219c9a7df 207 }
Deepti 0:9ac219c9a7df 208
Deepti 0:9ac219c9a7df 209 /**
Deepti 0:9ac219c9a7df 210 * @brief Read ID address of HTS221
Deepti 0:9ac219c9a7df 211 * @param Device ID address
Deepti 0:9ac219c9a7df 212 * @retval ID name
Deepti 0:9ac219c9a7df 213 */
Deepti 0:9ac219c9a7df 214 uint8_t HTS221_ReadID(void)
Deepti 0:9ac219c9a7df 215 {
Deepti 0:9ac219c9a7df 216 uint8_t tmp;
Deepti 0:9ac219c9a7df 217
Deepti 0:9ac219c9a7df 218 /* Read WHO I AM register */
Deepti 0:9ac219c9a7df 219 HUM_TEMP_IO_Read(&tmp, HTS221_ADDRESS, HTS221_WHO_AM_I_ADDR, 1);
Deepti 0:9ac219c9a7df 220
Deepti 0:9ac219c9a7df 221 /* Return the ID */
Deepti 0:9ac219c9a7df 222 return (uint8_t)tmp;
Deepti 0:9ac219c9a7df 223 }
Deepti 0:9ac219c9a7df 224
Deepti 0:9ac219c9a7df 225 /**
Deepti 0:9ac219c9a7df 226 * @brief Reboot memory content of HTS221
Deepti 0:9ac219c9a7df 227 * @param None
Deepti 0:9ac219c9a7df 228 * @retval None
Deepti 0:9ac219c9a7df 229 */
Deepti 0:9ac219c9a7df 230 void HTS221_RebootCmd(void)
Deepti 0:9ac219c9a7df 231 {
Deepti 0:9ac219c9a7df 232 uint8_t tmpreg;
Deepti 0:9ac219c9a7df 233
Deepti 0:9ac219c9a7df 234 /* Read CTRL_REG2 register */
Deepti 0:9ac219c9a7df 235 HUM_TEMP_IO_Read(&tmpreg, HTS221_ADDRESS, HTS221_CTRL_REG2_ADDR, 1);
Deepti 0:9ac219c9a7df 236
Deepti 0:9ac219c9a7df 237 /* Enable or Disable the reboot memory */
Deepti 0:9ac219c9a7df 238 tmpreg |= HTS221_BOOT_REBOOTMEMORY;
Deepti 0:9ac219c9a7df 239
Deepti 0:9ac219c9a7df 240 /* Write value to MEMS CTRL_REG2 regsister */
Deepti 0:9ac219c9a7df 241 HUM_TEMP_IO_Write(&tmpreg, HTS221_ADDRESS, HTS221_CTRL_REG2_ADDR, 1);
Deepti 0:9ac219c9a7df 242 }
Deepti 0:9ac219c9a7df 243
Deepti 0:9ac219c9a7df 244 /**
Deepti 0:9ac219c9a7df 245 * @brief Set HTS221 Interrupt INT1 configuration
Deepti 0:9ac219c9a7df 246 * @param HTS221_InterruptConfig_TypeDef: pointer to a HTS221_InterruptConfig_TypeDef
Deepti 0:9ac219c9a7df 247 * structure that contains the configuration setting for the HTS221 Interrupt.
Deepti 0:9ac219c9a7df 248 * @retval None
Deepti 0:9ac219c9a7df 249 */
Deepti 0:9ac219c9a7df 250 void HTS221_INT1InterruptConfig(uint16_t Int1Config)
Deepti 0:9ac219c9a7df 251 {
Deepti 0:9ac219c9a7df 252
Deepti 0:9ac219c9a7df 253 }
Deepti 0:9ac219c9a7df 254
Deepti 0:9ac219c9a7df 255 /**
Deepti 0:9ac219c9a7df 256 * @brief Enable INT1
Deepti 0:9ac219c9a7df 257 * @retval None
Deepti 0:9ac219c9a7df 258 */
Deepti 0:9ac219c9a7df 259 void HTS221_EnableIT(uint8_t IntPin)
Deepti 0:9ac219c9a7df 260 {
Deepti 0:9ac219c9a7df 261
Deepti 0:9ac219c9a7df 262 }
Deepti 0:9ac219c9a7df 263
Deepti 0:9ac219c9a7df 264 /**
Deepti 0:9ac219c9a7df 265 * @brief Disable INT1
Deepti 0:9ac219c9a7df 266 * @retval None
Deepti 0:9ac219c9a7df 267 */
Deepti 0:9ac219c9a7df 268 void HTS221_DisableIT(uint8_t IntPin)
Deepti 0:9ac219c9a7df 269 {
Deepti 0:9ac219c9a7df 270
Deepti 0:9ac219c9a7df 271 }
Deepti 0:9ac219c9a7df 272
Deepti 0:9ac219c9a7df 273
Deepti 0:9ac219c9a7df 274 /**
Deepti 0:9ac219c9a7df 275 * @brief Read HTS221 output register, and calculate the humidity.
Deepti 0:9ac219c9a7df 276 * @param pfData : Data out pointer
Deepti 0:9ac219c9a7df 277 * @retval None
Deepti 0:9ac219c9a7df 278 */
Deepti 0:9ac219c9a7df 279 void HTS221_GetHumidity(float* pfData)
Deepti 0:9ac219c9a7df 280 {
Deepti 0:9ac219c9a7df 281 int16_t H_T_out, humidity_t;
Deepti 0:9ac219c9a7df 282 uint8_t tempReg[2] = {0,0};
Deepti 0:9ac219c9a7df 283 uint8_t tmp = 0x00;
Deepti 0:9ac219c9a7df 284 float H_rh;
Deepti 0:9ac219c9a7df 285
Deepti 0:9ac219c9a7df 286 HUM_TEMP_IO_Read(&tmp, HTS221_ADDRESS, HTS221_CTRL_REG1_ADDR, 1);
Deepti 0:9ac219c9a7df 287
Deepti 0:9ac219c9a7df 288 /* Output Data Rate selection */
Deepti 0:9ac219c9a7df 289 tmp &= (HTS221_ODR_MASK);
Deepti 0:9ac219c9a7df 290
Deepti 0:9ac219c9a7df 291 if(tmp == 0x00){
Deepti 0:9ac219c9a7df 292
Deepti 0:9ac219c9a7df 293 HUM_TEMP_IO_Read(&tmp, HTS221_ADDRESS, HTS221_CTRL_REG2_ADDR, 1);
Deepti 0:9ac219c9a7df 294
Deepti 0:9ac219c9a7df 295 /* Serial Interface Mode selection */
Deepti 0:9ac219c9a7df 296 tmp &= ~(HTS221_ONE_SHOT_MASK);
Deepti 0:9ac219c9a7df 297 tmp |= HTS221_ONE_SHOT_START;
Deepti 0:9ac219c9a7df 298
Deepti 0:9ac219c9a7df 299 HUM_TEMP_IO_Write(&tmp, HTS221_ADDRESS, HTS221_CTRL_REG2_ADDR, 1);
Deepti 0:9ac219c9a7df 300
Deepti 0:9ac219c9a7df 301 do{
Deepti 0:9ac219c9a7df 302
Deepti 0:9ac219c9a7df 303 HUM_TEMP_IO_Read(&tmp, HTS221_ADDRESS, HTS221_STATUS_REG_ADDR, 1);
Deepti 0:9ac219c9a7df 304
Deepti 0:9ac219c9a7df 305 }while(!(tmp&&0x02));
Deepti 0:9ac219c9a7df 306
Deepti 0:9ac219c9a7df 307 }
Deepti 0:9ac219c9a7df 308
Deepti 0:9ac219c9a7df 309
Deepti 0:9ac219c9a7df 310 HUM_TEMP_IO_Read(&tempReg[0], HTS221_ADDRESS, HTS221_HUMIDITY_OUT_L_ADDR + 0x80, 2);
Deepti 0:9ac219c9a7df 311 H_T_out = ((((int16_t)tempReg[1]) << 8)+(int16_t)tempReg[0]);
Deepti 0:9ac219c9a7df 312
Deepti 0:9ac219c9a7df 313 H_rh = ((float)(H_T_out - H0_T0_out))/(H1_T0_out - H0_T0_out) * (H1_rh - H0_rh) + H0_rh;
Deepti 0:9ac219c9a7df 314
Deepti 0:9ac219c9a7df 315 humidity_t = (uint16_t)(H_rh * pow(10,HUM_DECIMAL_DIGITS));
Deepti 0:9ac219c9a7df 316
Deepti 0:9ac219c9a7df 317 *pfData = ((float)humidity_t)/pow(10,HUM_DECIMAL_DIGITS);
Deepti 0:9ac219c9a7df 318 }
Deepti 0:9ac219c9a7df 319
Deepti 0:9ac219c9a7df 320 /**
Deepti 0:9ac219c9a7df 321 * @brief Read HTS221 output register, and calculate the temperature.
Deepti 0:9ac219c9a7df 322 * @param pfData : Data out pointer
Deepti 0:9ac219c9a7df 323 * @retval None
Deepti 0:9ac219c9a7df 324 */
Deepti 0:9ac219c9a7df 325 void HTS221_GetTemperature(float* pfData)
Deepti 0:9ac219c9a7df 326 {
Deepti 0:9ac219c9a7df 327 int16_t T_out, temperature_t;
Deepti 0:9ac219c9a7df 328 uint8_t tempReg[2] = {0,0};
Deepti 0:9ac219c9a7df 329 uint8_t tmp = 0x00;
Deepti 0:9ac219c9a7df 330 float T_degC;
Deepti 0:9ac219c9a7df 331
Deepti 0:9ac219c9a7df 332 HUM_TEMP_IO_Read(&tmp, HTS221_ADDRESS, HTS221_CTRL_REG1_ADDR, 1);
Deepti 0:9ac219c9a7df 333
Deepti 0:9ac219c9a7df 334 /* Output Data Rate selection */
Deepti 0:9ac219c9a7df 335 tmp &= (HTS221_ODR_MASK);
Deepti 0:9ac219c9a7df 336
Deepti 0:9ac219c9a7df 337 if(tmp == 0x00){
Deepti 0:9ac219c9a7df 338
Deepti 0:9ac219c9a7df 339 HUM_TEMP_IO_Read(&tmp, HTS221_ADDRESS, HTS221_CTRL_REG2_ADDR, 1);
Deepti 0:9ac219c9a7df 340
Deepti 0:9ac219c9a7df 341 /* Serial Interface Mode selection */
Deepti 0:9ac219c9a7df 342 tmp &= ~(HTS221_ONE_SHOT_MASK);
Deepti 0:9ac219c9a7df 343 tmp |= HTS221_ONE_SHOT_START;
Deepti 0:9ac219c9a7df 344
Deepti 0:9ac219c9a7df 345 HUM_TEMP_IO_Write(&tmp, HTS221_ADDRESS, HTS221_CTRL_REG2_ADDR, 1);
Deepti 0:9ac219c9a7df 346
Deepti 0:9ac219c9a7df 347 do{
Deepti 0:9ac219c9a7df 348
Deepti 0:9ac219c9a7df 349 HUM_TEMP_IO_Read(&tmp, HTS221_ADDRESS, HTS221_STATUS_REG_ADDR, 1);
Deepti 0:9ac219c9a7df 350
Deepti 0:9ac219c9a7df 351 }while(!(tmp&&0x01));
Deepti 0:9ac219c9a7df 352
Deepti 0:9ac219c9a7df 353 }
Deepti 0:9ac219c9a7df 354
Deepti 0:9ac219c9a7df 355 HUM_TEMP_IO_Read(&tempReg[0], HTS221_ADDRESS, HTS221_TEMP_OUT_L_ADDR + 0x80, 2);
Deepti 0:9ac219c9a7df 356 T_out = ((((int16_t)tempReg[1]) << 8)+(int16_t)tempReg[0]);
Deepti 0:9ac219c9a7df 357
Deepti 0:9ac219c9a7df 358 T_degC = ((float)(T_out - T0_out))/(T1_out - T0_out) * (T1_degC - T0_degC) + T0_degC;
Deepti 0:9ac219c9a7df 359
Deepti 0:9ac219c9a7df 360 temperature_t = (int16_t)(T_degC * pow(10,TEMP_DECIMAL_DIGITS));
Deepti 0:9ac219c9a7df 361
Deepti 0:9ac219c9a7df 362 *pfData = ((float)temperature_t)/pow(10,TEMP_DECIMAL_DIGITS);
Deepti 0:9ac219c9a7df 363 }
Deepti 0:9ac219c9a7df 364
Deepti 0:9ac219c9a7df 365
Deepti 0:9ac219c9a7df 366 /**
Deepti 0:9ac219c9a7df 367 * @brief Exit the shutdown mode for HTS221.
Deepti 0:9ac219c9a7df 368 * @retval None
Deepti 0:9ac219c9a7df 369 */
Deepti 0:9ac219c9a7df 370 static void HTS221_Power_On()
Deepti 0:9ac219c9a7df 371 {
Deepti 0:9ac219c9a7df 372 uint8_t tmpReg;
Deepti 0:9ac219c9a7df 373
Deepti 0:9ac219c9a7df 374 /* Read the register content */
Deepti 0:9ac219c9a7df 375 HUM_TEMP_IO_Read(&tmpReg, HTS221_ADDRESS, HTS221_CTRL_REG1_ADDR, 1);
Deepti 0:9ac219c9a7df 376
Deepti 0:9ac219c9a7df 377 /* Set the power down bit */
Deepti 0:9ac219c9a7df 378 tmpReg |= HTS221_MODE_ACTIVE;
Deepti 0:9ac219c9a7df 379
Deepti 0:9ac219c9a7df 380 /* Write register */
Deepti 0:9ac219c9a7df 381 HUM_TEMP_IO_Write(&tmpReg, HTS221_ADDRESS, HTS221_CTRL_REG1_ADDR, 1);
Deepti 0:9ac219c9a7df 382 }
Deepti 0:9ac219c9a7df 383
Deepti 0:9ac219c9a7df 384 /**
Deepti 0:9ac219c9a7df 385 * @brief Enter the shutdown mode for HTS221.
Deepti 0:9ac219c9a7df 386 * @retval None
Deepti 0:9ac219c9a7df 387 */
Deepti 0:9ac219c9a7df 388 void HTS221_Power_OFF()
Deepti 0:9ac219c9a7df 389 {
Deepti 0:9ac219c9a7df 390 uint8_t tmpReg;
Deepti 0:9ac219c9a7df 391
Deepti 0:9ac219c9a7df 392 /* Read the register content */
Deepti 0:9ac219c9a7df 393 HUM_TEMP_IO_Read(&tmpReg, HTS221_ADDRESS, HTS221_CTRL_REG1_ADDR, 1);
Deepti 0:9ac219c9a7df 394
Deepti 0:9ac219c9a7df 395 /* Reset the power down bit */
Deepti 0:9ac219c9a7df 396 tmpReg &= ~(HTS221_MODE_ACTIVE);
Deepti 0:9ac219c9a7df 397
Deepti 0:9ac219c9a7df 398 /* Write register */
Deepti 0:9ac219c9a7df 399 HUM_TEMP_IO_Write(&tmpReg, HTS221_ADDRESS, HTS221_CTRL_REG1_ADDR, 1);
Deepti 0:9ac219c9a7df 400 }
Deepti 0:9ac219c9a7df 401
Deepti 0:9ac219c9a7df 402 /**
Deepti 0:9ac219c9a7df 403 * @}
Deepti 0:9ac219c9a7df 404 */
Deepti 0:9ac219c9a7df 405
Deepti 0:9ac219c9a7df 406 /**
Deepti 0:9ac219c9a7df 407 * @}
Deepti 0:9ac219c9a7df 408 */
Deepti 0:9ac219c9a7df 409
Deepti 0:9ac219c9a7df 410 /**
Deepti 0:9ac219c9a7df 411 * @}
Deepti 0:9ac219c9a7df 412 */
Deepti 0:9ac219c9a7df 413
Deepti 0:9ac219c9a7df 414 /**
Deepti 0:9ac219c9a7df 415 * @}
Deepti 0:9ac219c9a7df 416 */
Deepti 0:9ac219c9a7df 417
Deepti 0:9ac219c9a7df 418
Deepti 0:9ac219c9a7df 419 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
Deepti 0:9ac219c9a7df 420