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Catie fork
Dependencies: SDFileSystem X_NUCLEO_IKS01A1
Fork of ATT_AWS_IoT_demo by
Diff: Sensors/Temperature/hts221_driver.cpp
- Revision:
- 29:537df716ba0b
- Parent:
- 28:a31312c9756d
diff -r a31312c9756d -r 537df716ba0b Sensors/Temperature/hts221_driver.cpp --- a/Sensors/Temperature/hts221_driver.cpp Wed Apr 05 08:32:05 2017 +0000 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,250 +0,0 @@ - -#include "HTS221.h" - - -// ------------------------------------------------------------------------------ -//jmf -- define I2C pins and functions to read & write to I2C device - -#include <string> -#include "mbed.h" - -#include "hardware.h" -//I2C i2c(PTC11, PTC10); //SDA, SCL -- define the I2C pins being used. Defined in a -//common locatioin since sensors also use I2C - -// Read a single unsigned char from addressToRead and return it as a unsigned char -unsigned char HTS221::readRegister(unsigned char slaveAddress, unsigned char ToRead) -{ - char data = ToRead; - - i2c.write(slaveAddress, &data, 1, 1); - i2c.read(slaveAddress, &data, 1, 0); - return data; -} - -// Writes a single unsigned char (dataToWrite) into regToWrite -int HTS221::writeRegister(unsigned char slaveAddress, unsigned char regToWrite, unsigned char dataToWrite) -{ - const char data[] = {regToWrite, dataToWrite}; - - return i2c.write(slaveAddress,data,2,0); -} - - -//jmf end -// ------------------------------------------------------------------------------ - -//static inline int humidityReady(uint8_t data) { -// return (data & 0x02); -//} -//static inline int temperatureReady(uint8_t data) { -// return (data & 0x01); -//} - - -HTS221::HTS221(void) : _address(HTS221_ADDRESS) -{ - _temperature = 0; - _humidity = 0; -} - - -int HTS221::begin(void) -{ - uint8_t data; - - data = readRegister(_address, WHO_AM_I); - if (data == WHO_AM_I_RETURN){ - if (activate()){ - storeCalibration(); - return data; - } - } - - return 0; -} - -int -HTS221::storeCalibration(void) -{ - uint8_t data; - uint16_t tmp; - - for (int reg=CALIB_START; reg<=CALIB_END; reg++) { - if ((reg!=CALIB_START+8) && (reg!=CALIB_START+9) && (reg!=CALIB_START+4)) { - - data = readRegister(HTS221_ADDRESS, reg); - - switch (reg) { - case CALIB_START: - _h0_rH = data; - break; - case CALIB_START+1: - _h1_rH = data; - break; - case CALIB_START+2: - _T0_degC = data; - break; - case CALIB_START+3: - _T1_degC = data; - break; - - case CALIB_START+5: - tmp = _T0_degC; - _T0_degC = (data&0x3)<<8; - _T0_degC |= tmp; - - tmp = _T1_degC; - _T1_degC = ((data&0xC)>>2)<<8; - _T1_degC |= tmp; - break; - case CALIB_START+6: - _H0_T0 = data; - break; - case CALIB_START+7: - _H0_T0 |= data<<8; - break; - case CALIB_START+0xA: - _H1_T0 = data; - break; - case CALIB_START+0xB: - _H1_T0 |= data <<8; - break; - case CALIB_START+0xC: - _T0_OUT = data; - break; - case CALIB_START+0xD: - _T0_OUT |= data << 8; - break; - case CALIB_START+0xE: - _T1_OUT = data; - break; - case CALIB_START+0xF: - _T1_OUT |= data << 8; - break; - - - case CALIB_START+8: - case CALIB_START+9: - case CALIB_START+4: - //DO NOTHING - break; - - // to cover any possible error - default: - return false; - } /* switch */ - } /* if */ - } /* for */ - return true; -} - - -int -HTS221::activate(void) -{ - uint8_t data; - - data = readRegister(_address, CTRL_REG1); - data |= POWER_UP; - data |= ODR0_SET; - writeRegister(_address, CTRL_REG1, data); - - return true; -} - - -int HTS221::deactivate(void) -{ - uint8_t data; - - data = readRegister(_address, CTRL_REG1); - data &= ~POWER_UP; - writeRegister(_address, CTRL_REG1, data); - return true; -} - - -int -HTS221::bduActivate(void) -{ - uint8_t data; - - data = readRegister(_address, CTRL_REG1); - data |= BDU_SET; - writeRegister(_address, CTRL_REG1, data); - - return true; -} - - -int -HTS221::bduDeactivate(void) -{ - uint8_t data; - - data = readRegister(_address, CTRL_REG1); - data &= ~BDU_SET; - writeRegister(_address, CTRL_REG1, data); - return true; -} - - -int -HTS221::readHumidity(void) -{ - uint8_t data = 0; - uint16_t h_out = 0; - double h_temp = 0.0; - double hum = 0.0; - - data = readRegister(_address, STATUS_REG); - - if (data & HUMIDITY_READY) { - data = readRegister(_address, HUMIDITY_H_REG); - h_out = data << 8; // MSB - data = readRegister(_address, HUMIDITY_L_REG); - h_out |= data; // LSB - - // Decode Humidity - hum = ((int16_t)(_h1_rH) - (int16_t)(_h0_rH))/2.0; // remove x2 multiple - - // Calculate humidity in decimal of grade centigrades i.e. 15.0 = 150. - h_temp = (((int16_t)h_out - (int16_t)_H0_T0) * hum) / ((int16_t)_H1_T0 - (int16_t)_H0_T0); - hum = ((int16_t)_h0_rH) / 2.0; // remove x2 multiple - _humidity = (int16_t)((hum + h_temp)); // provide signed % measurement unit - } - return _humidity; -} - - - -double -HTS221::readTemperature(void) -{ - uint8_t data = 0; - uint16_t t_out = 0; - double t_temp = 0.0; - double deg = 0.0; - - data = readRegister(_address, STATUS_REG); - - if (data & TEMPERATURE_READY) { - - data= readRegister(_address, TEMP_H_REG); - t_out = data << 8; // MSB - data = readRegister(_address, TEMP_L_REG); - t_out |= data; // LSB - - // Decode Temperature - deg = ((int16_t)(_T1_degC) - (int16_t)(_T0_degC))/8.0; // remove x8 multiple - - // Calculate Temperature in decimal of grade centigrades i.e. 15.0 = 150. - t_temp = (((int16_t)t_out - (int16_t)_T0_OUT) * deg) / ((int16_t)_T1_OUT - (int16_t)_T0_OUT); - deg = ((int16_t)_T0_degC) / 8.0; // remove x8 multiple - _temperature = deg + t_temp; // provide signed celsius measurement unit - } - - return _temperature; -} -