Contains the BSP driver for the B-L475E-IOT01 board.
Dependents: mbed-os-example-ble-Thermometer DISCO_L475VG_IOT01-Telegram-BOT DISCO_L475VG_IOT01-sche_cheveux DISCO_L475VG_IOT01-QSPI_FLASH_FILE_SYSTEM ... more
https://os.mbed.com/platforms/ST-Discovery-L475E-IOT01A/
Drivers/BSP/Components/hts221/hts221.c
- Committer:
- jeromecoutant
- Date:
- 2019-09-24
- Revision:
- 7:bfe8272ced90
- Parent:
- 4:137bb367ba50
File content as of revision 7:bfe8272ced90:
/** ****************************************************************************** * @file hts221.c * @author MCD Application Team * @brief This file provides a set of functions needed to manage the HTS221 * humidity and temperature devices ****************************************************************************** * @attention * * <h2><center>© Copyright (c) 2017 STMicroelectronics. * All rights reserved.</center></h2> * * This software component is licensed by ST under BSD 3-Clause license, * the "License"; You may not use this file except in compliance with the * License. You may obtain a copy of the License at: * opensource.org/licenses/BSD-3-Clause * ****************************************************************************** */ /* Includes ------------------------------------------------------------------*/ #include "hts221.h" /** @addtogroup BSP * @{ */ /** @addtogroup Component * @{ */ /** @defgroup HTS221 HTS221 * @{ */ /** @defgroup HTS221_Private_Variables HTS221 Private Variables * @{ */ /* HTS221 Humidity Private Variables */ HSENSOR_DrvTypeDef HTS221_H_Drv = { HTS221_H_Init, HTS221_H_ReadID, HTS221_H_ReadHumidity }; /* HTS221_Temperature_Private_Variables */ TSENSOR_DrvTypeDef HTS221_T_Drv = { HTS221_T_Init, 0, 0, HTS221_T_ReadTemp }; /** * @} */ /** @defgroup HTS221_Humidity_Private_Functions HTS221 Humidity Private Functions * @{ */ /** * @brief Set HTS221 humidity sensor Initialization. */ void HTS221_H_Init(uint16_t DeviceAddr) { uint8_t tmp; /* Read CTRL_REG1 */ tmp = SENSOR_IO_Read(DeviceAddr, HTS221_CTRL_REG1); /* Enable BDU */ tmp &= ~HTS221_BDU_MASK; tmp |= (1 << HTS221_BDU_BIT); /* Set default ODR */ tmp &= ~HTS221_ODR_MASK; tmp |= (uint8_t)0x01; /* Set ODR to 1Hz */ /* Activate the device */ tmp |= HTS221_PD_MASK; /* Apply settings to CTRL_REG1 */ SENSOR_IO_Write(DeviceAddr, HTS221_CTRL_REG1, tmp); } /** * @brief Read HTS221 ID. * @retval ID */ uint8_t HTS221_H_ReadID(uint16_t DeviceAddr) { uint8_t ctrl = 0x00; /* IO interface initialization */ SENSOR_IO_Init(); /* Read value at Who am I register address */ ctrl = SENSOR_IO_Read(DeviceAddr, HTS221_WHO_AM_I_REG); return ctrl; } /** * @brief Read humidity value of HTS221 * @retval humidity value; */ float HTS221_H_ReadHumidity(uint16_t DeviceAddr) { int16_t H0_T0_out, H1_T0_out, H_T_out; int16_t H0_rh, H1_rh; uint8_t buffer[2]; float tmp_f; SENSOR_IO_ReadMultiple(DeviceAddr, (HTS221_H0_RH_X2 | 0x80), buffer, 2); H0_rh = buffer[0] >> 1; H1_rh = buffer[1] >> 1; SENSOR_IO_ReadMultiple(DeviceAddr, (HTS221_H0_T0_OUT_L | 0x80), buffer, 2); H0_T0_out = (((uint16_t)buffer[1]) << 8) | (uint16_t)buffer[0]; SENSOR_IO_ReadMultiple(DeviceAddr, (HTS221_H1_T0_OUT_L | 0x80), buffer, 2); H1_T0_out = (((uint16_t)buffer[1]) << 8) | (uint16_t)buffer[0]; SENSOR_IO_ReadMultiple(DeviceAddr, (HTS221_HR_OUT_L_REG | 0x80), buffer, 2); H_T_out = (((uint16_t)buffer[1]) << 8) | (uint16_t)buffer[0]; tmp_f = (float)(H_T_out - H0_T0_out) * (float)(H1_rh - H0_rh) / (float)(H1_T0_out - H0_T0_out) + H0_rh; tmp_f *= 10.0f; tmp_f = ( tmp_f > 1000.0f ) ? 1000.0f : ( tmp_f < 0.0f ) ? 0.0f : tmp_f; return (tmp_f / 10.0f); } /** * @} */ /** @defgroup HTS221_Temperature_Private_Functions HTS221 Temperature Private Functions * @{ */ /** * @brief Set HTS221 temperature sensor Initialization. * @param DeviceAddr: I2C device address * @param InitStruct: pointer to a TSENSOR_InitTypeDef structure * that contains the configuration setting for the HTS221. */ void HTS221_T_Init(uint16_t DeviceAddr, TSENSOR_InitTypeDef *pInitStruct) { uint8_t tmp; /* Read CTRL_REG1 */ tmp = SENSOR_IO_Read(DeviceAddr, HTS221_CTRL_REG1); /* Enable BDU */ tmp &= ~HTS221_BDU_MASK; tmp |= (1 << HTS221_BDU_BIT); /* Set default ODR */ tmp &= ~HTS221_ODR_MASK; tmp |= (uint8_t)0x01; /* Set ODR to 1Hz */ /* Activate the device */ tmp |= HTS221_PD_MASK; /* Apply settings to CTRL_REG1 */ SENSOR_IO_Write(DeviceAddr, HTS221_CTRL_REG1, tmp); } /** * @brief Read temperature value of HTS221 * @param DeviceAddr: I2C device address * @retval temperature value */ float HTS221_T_ReadTemp(uint16_t DeviceAddr) { int16_t T0_out, T1_out, T_out, T0_degC_x8_u16, T1_degC_x8_u16; int16_t T0_degC, T1_degC; uint8_t buffer[4], tmp; float tmp_f; SENSOR_IO_ReadMultiple(DeviceAddr, (HTS221_T0_DEGC_X8 | 0x80), buffer, 2); tmp = SENSOR_IO_Read(DeviceAddr, HTS221_T0_T1_DEGC_H2); T0_degC_x8_u16 = (((uint16_t)(tmp & 0x03)) << 8) | ((uint16_t)buffer[0]); T1_degC_x8_u16 = (((uint16_t)(tmp & 0x0C)) << 6) | ((uint16_t)buffer[1]); T0_degC = T0_degC_x8_u16 >> 3; T1_degC = T1_degC_x8_u16 >> 3; SENSOR_IO_ReadMultiple(DeviceAddr, (HTS221_T0_OUT_L | 0x80), buffer, 4); T0_out = (((uint16_t)buffer[1]) << 8) | (uint16_t)buffer[0]; T1_out = (((uint16_t)buffer[3]) << 8) | (uint16_t)buffer[2]; SENSOR_IO_ReadMultiple(DeviceAddr, (HTS221_TEMP_OUT_L_REG | 0x80), buffer, 2); T_out = (((uint16_t)buffer[1]) << 8) | (uint16_t)buffer[0]; tmp_f = (float)(T_out - T0_out) * (float)(T1_degC - T0_degC) / (float)(T1_out - T0_out) + T0_degC; return tmp_f; } /** * @} */ /** * @} */ /** * @} */ /** * @} */ /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/