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I added functionality to get the RSSI, BER, and Cell Neighbor for reporting connection issues to M2X
Dependencies: mbed FXOS8700CQ mbed-rtos WNCInterface M2XStreamClient-JMF jsonlite
hts221_driver.cpp
- Committer:
- ng977t
- Date:
- 2019-04-18
- Revision:
- 13:99c72ab600c9
- Parent:
- 4:08979e323c6e
File content as of revision 13:99c72ab600c9:
/* =================================================================== Copyright © 2016, AVNET Inc. Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. ======================================================================== */ #include "HTS221.h" // ------------------------------------------------------------------------------ //jmf -- define I2C pins and functions to read & write to I2C device #include <string> #include "mbed.h" extern I2C 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, 0); i2c.write(slaveAddress, &data, 1, 1); //by Stefan 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; }