Avnet / Mbed 2 deprecated BluemixDemo

Bluemix Demo program

Dependencies:   WNCInterface mbed-rtos mbed

HTS221.cpp@3:4b91766a3817, 2016-11-17 (annotated)

Committer:
root@developer-sjc-cyan-compiler.local.mbed.org
Date:
Thu Nov 17 18:26:24 2016 +0000
Revision:
3:4b91766a3817
Parent:
0:6a929f0d0e58 
Added tag att_cellular_K64_wnc_14A2A_20161117 for changeset 5fc069c70129

Who changed what in which revision?

UserRevisionLine numberNew contents of line
JMF 0:6a929f0d0e58 1 /* ===================================================================
JMF 0:6a929f0d0e58 2 Copyright © 2016, AVNET Inc.
JMF 0:6a929f0d0e58 3
JMF 0:6a929f0d0e58 4 Licensed under the Apache License, Version 2.0 (the "License");
JMF 0:6a929f0d0e58 5 you may not use this file except in compliance with the License.
JMF 0:6a929f0d0e58 6 You may obtain a copy of the License at
JMF 0:6a929f0d0e58 7
JMF 0:6a929f0d0e58 8 http://www.apache.org/licenses/LICENSE-2.0
JMF 0:6a929f0d0e58 9
JMF 0:6a929f0d0e58 10 Unless required by applicable law or agreed to in writing,
JMF 0:6a929f0d0e58 11 software distributed under the License is distributed on an
JMF 0:6a929f0d0e58 12 "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
JMF 0:6a929f0d0e58 13 either express or implied. See the License for the specific
JMF 0:6a929f0d0e58 14 language governing permissions and limitations under the License.
JMF 0:6a929f0d0e58 15
JMF 0:6a929f0d0e58 16 ======================================================================== */
JMF 0:6a929f0d0e58 17
JMF 0:6a929f0d0e58 18 #include "HTS221.h"
JMF 0:6a929f0d0e58 19
JMF 0:6a929f0d0e58 20
JMF 0:6a929f0d0e58 21 // ------------------------------------------------------------------------------
JMF 0:6a929f0d0e58 22 //jmf -- define I2C pins and functions to read & write to I2C device
JMF 0:6a929f0d0e58 23
JMF 0:6a929f0d0e58 24 #include <string>
JMF 0:6a929f0d0e58 25 #include "mbed.h"
JMF 0:6a929f0d0e58 26 #include "hardware.h"
JMF 0:6a929f0d0e58 27
JMF 0:6a929f0d0e58 28 // Read a single unsigned char from addressToRead and return it as a unsigned char
JMF 0:6a929f0d0e58 29 unsigned char HTS221::readRegister(unsigned char slaveAddress, unsigned char ToRead)
JMF 0:6a929f0d0e58 30 {
JMF 0:6a929f0d0e58 31 char data = ToRead;
JMF 0:6a929f0d0e58 32
JMF 0:6a929f0d0e58 33 //i2c.write(slaveAddress, &data, 1, 0);
JMF 0:6a929f0d0e58 34 i2c.write(slaveAddress, &data, 1, 1); //by Stefan
JMF 0:6a929f0d0e58 35 i2c.read(slaveAddress, &data, 1, 0);
JMF 0:6a929f0d0e58 36 return data;
JMF 0:6a929f0d0e58 37 }
JMF 0:6a929f0d0e58 38
JMF 0:6a929f0d0e58 39 // Writes a single unsigned char (dataToWrite) into regToWrite
JMF 0:6a929f0d0e58 40 int HTS221::writeRegister(unsigned char slaveAddress, unsigned char regToWrite, unsigned char dataToWrite)
JMF 0:6a929f0d0e58 41 {
JMF 0:6a929f0d0e58 42 const char data[] = {regToWrite, dataToWrite};
JMF 0:6a929f0d0e58 43
JMF 0:6a929f0d0e58 44 return i2c.write(slaveAddress,data,2,0);
JMF 0:6a929f0d0e58 45 }
JMF 0:6a929f0d0e58 46
JMF 0:6a929f0d0e58 47
JMF 0:6a929f0d0e58 48 //jmf end
JMF 0:6a929f0d0e58 49 // ------------------------------------------------------------------------------
JMF 0:6a929f0d0e58 50
JMF 0:6a929f0d0e58 51 HTS221::HTS221(void) : _address(HTS221_ADDRESS) {
JMF 0:6a929f0d0e58 52 _temperature = 0;
JMF 0:6a929f0d0e58 53 _humidity = 0;
JMF 0:6a929f0d0e58 54 }
JMF 0:6a929f0d0e58 55
JMF 0:6a929f0d0e58 56
JMF 0:6a929f0d0e58 57 int HTS221::init(void) {
JMF 0:6a929f0d0e58 58 uint8_t data;
JMF 0:6a929f0d0e58 59
JMF 0:6a929f0d0e58 60 data = readRegister(_address, WHO_AM_I);
JMF 0:6a929f0d0e58 61 if (data == WHO_AM_I_RETURN){
JMF 0:6a929f0d0e58 62 if (activate()){
JMF 0:6a929f0d0e58 63 storeCalibration();
JMF 0:6a929f0d0e58 64 return data;
JMF 0:6a929f0d0e58 65 }
JMF 0:6a929f0d0e58 66 }
JMF 0:6a929f0d0e58 67
JMF 0:6a929f0d0e58 68 return 0;
JMF 0:6a929f0d0e58 69 }
JMF 0:6a929f0d0e58 70
JMF 0:6a929f0d0e58 71 int HTS221::storeCalibration(void) {
JMF 0:6a929f0d0e58 72 uint8_t data;
JMF 0:6a929f0d0e58 73 uint16_t tmp;
JMF 0:6a929f0d0e58 74
JMF 0:6a929f0d0e58 75 for (int reg=CALIB_START; reg<=CALIB_END; reg++) {
JMF 0:6a929f0d0e58 76 if ((reg!=CALIB_START+8) && (reg!=CALIB_START+9) && (reg!=CALIB_START+4)) {
JMF 0:6a929f0d0e58 77
JMF 0:6a929f0d0e58 78 data = readRegister(HTS221_ADDRESS, reg);
JMF 0:6a929f0d0e58 79
JMF 0:6a929f0d0e58 80 switch (reg) {
JMF 0:6a929f0d0e58 81 case CALIB_START:
JMF 0:6a929f0d0e58 82 _h0_rH = data;
JMF 0:6a929f0d0e58 83 break;
JMF 0:6a929f0d0e58 84 case CALIB_START+1:
JMF 0:6a929f0d0e58 85 _h1_rH = data;
JMF 0:6a929f0d0e58 86 break;
JMF 0:6a929f0d0e58 87 case CALIB_START+2:
JMF 0:6a929f0d0e58 88 _T0_degC = data;
JMF 0:6a929f0d0e58 89 break;
JMF 0:6a929f0d0e58 90 case CALIB_START+3:
JMF 0:6a929f0d0e58 91 _T1_degC = data;
JMF 0:6a929f0d0e58 92 break;
JMF 0:6a929f0d0e58 93
JMF 0:6a929f0d0e58 94 case CALIB_START+5:
JMF 0:6a929f0d0e58 95 tmp = _T0_degC;
JMF 0:6a929f0d0e58 96 _T0_degC = (data&0x3)<<8;
JMF 0:6a929f0d0e58 97 _T0_degC |= tmp;
JMF 0:6a929f0d0e58 98
JMF 0:6a929f0d0e58 99 tmp = _T1_degC;
JMF 0:6a929f0d0e58 100 _T1_degC = ((data&0xC)>>2)<<8;
JMF 0:6a929f0d0e58 101 _T1_degC |= tmp;
JMF 0:6a929f0d0e58 102 break;
JMF 0:6a929f0d0e58 103 case CALIB_START+6:
JMF 0:6a929f0d0e58 104 _H0_T0 = data;
JMF 0:6a929f0d0e58 105 break;
JMF 0:6a929f0d0e58 106 case CALIB_START+7:
JMF 0:6a929f0d0e58 107 _H0_T0 |= data<<8;
JMF 0:6a929f0d0e58 108 break;
JMF 0:6a929f0d0e58 109 case CALIB_START+0xA:
JMF 0:6a929f0d0e58 110 _H1_T0 = data;
JMF 0:6a929f0d0e58 111 break;
JMF 0:6a929f0d0e58 112 case CALIB_START+0xB:
JMF 0:6a929f0d0e58 113 _H1_T0 |= data <<8;
JMF 0:6a929f0d0e58 114 break;
JMF 0:6a929f0d0e58 115 case CALIB_START+0xC:
JMF 0:6a929f0d0e58 116 _T0_OUT = data;
JMF 0:6a929f0d0e58 117 break;
JMF 0:6a929f0d0e58 118 case CALIB_START+0xD:
JMF 0:6a929f0d0e58 119 _T0_OUT |= data << 8;
JMF 0:6a929f0d0e58 120 break;
JMF 0:6a929f0d0e58 121 case CALIB_START+0xE:
JMF 0:6a929f0d0e58 122 _T1_OUT = data;
JMF 0:6a929f0d0e58 123 break;
JMF 0:6a929f0d0e58 124 case CALIB_START+0xF:
JMF 0:6a929f0d0e58 125 _T1_OUT |= data << 8;
JMF 0:6a929f0d0e58 126 break;
JMF 0:6a929f0d0e58 127
JMF 0:6a929f0d0e58 128
JMF 0:6a929f0d0e58 129 case CALIB_START+8:
JMF 0:6a929f0d0e58 130 case CALIB_START+9:
JMF 0:6a929f0d0e58 131 case CALIB_START+4:
JMF 0:6a929f0d0e58 132 //DO NOTHING
JMF 0:6a929f0d0e58 133 break;
JMF 0:6a929f0d0e58 134
JMF 0:6a929f0d0e58 135 // to cover any possible error
JMF 0:6a929f0d0e58 136 default:
JMF 0:6a929f0d0e58 137 return false;
JMF 0:6a929f0d0e58 138 } /* switch */
JMF 0:6a929f0d0e58 139 } /* if */
JMF 0:6a929f0d0e58 140 } /* for */
JMF 0:6a929f0d0e58 141 return true;
JMF 0:6a929f0d0e58 142 }
JMF 0:6a929f0d0e58 143
JMF 0:6a929f0d0e58 144
JMF 0:6a929f0d0e58 145 int HTS221::activate(void) {
JMF 0:6a929f0d0e58 146 uint8_t data;
JMF 0:6a929f0d0e58 147
JMF 0:6a929f0d0e58 148 data = readRegister(_address, CTRL_REG1);
JMF 0:6a929f0d0e58 149 data |= POWER_UP;
JMF 0:6a929f0d0e58 150 data |= ODR0_SET;
JMF 0:6a929f0d0e58 151 writeRegister(_address, CTRL_REG1, data);
JMF 0:6a929f0d0e58 152
JMF 0:6a929f0d0e58 153 return true;
JMF 0:6a929f0d0e58 154 }
JMF 0:6a929f0d0e58 155
JMF 0:6a929f0d0e58 156
JMF 0:6a929f0d0e58 157 int HTS221::deactivate(void) {
JMF 0:6a929f0d0e58 158 uint8_t data;
JMF 0:6a929f0d0e58 159
JMF 0:6a929f0d0e58 160 data = readRegister(_address, CTRL_REG1);
JMF 0:6a929f0d0e58 161 data &= ~POWER_UP;
JMF 0:6a929f0d0e58 162 writeRegister(_address, CTRL_REG1, data);
JMF 0:6a929f0d0e58 163 return true;
JMF 0:6a929f0d0e58 164 }
JMF 0:6a929f0d0e58 165
JMF 0:6a929f0d0e58 166
JMF 0:6a929f0d0e58 167 int HTS221::bduActivate(void) {
JMF 0:6a929f0d0e58 168 uint8_t data;
JMF 0:6a929f0d0e58 169
JMF 0:6a929f0d0e58 170 data = readRegister(_address, CTRL_REG1);
JMF 0:6a929f0d0e58 171 data |= BDU_SET;
JMF 0:6a929f0d0e58 172 writeRegister(_address, CTRL_REG1, data);
JMF 0:6a929f0d0e58 173
JMF 0:6a929f0d0e58 174 return true;
JMF 0:6a929f0d0e58 175 }
JMF 0:6a929f0d0e58 176
JMF 0:6a929f0d0e58 177
JMF 0:6a929f0d0e58 178 int HTS221::bduDeactivate(void) {
JMF 0:6a929f0d0e58 179 uint8_t data;
JMF 0:6a929f0d0e58 180
JMF 0:6a929f0d0e58 181 data = readRegister(_address, CTRL_REG1);
JMF 0:6a929f0d0e58 182 data &= ~BDU_SET;
JMF 0:6a929f0d0e58 183 writeRegister(_address, CTRL_REG1, data);
JMF 0:6a929f0d0e58 184 return true;
JMF 0:6a929f0d0e58 185 }
JMF 0:6a929f0d0e58 186
JMF 0:6a929f0d0e58 187
JMF 0:6a929f0d0e58 188 int HTS221::readHumidity(void) {
JMF 0:6a929f0d0e58 189 uint8_t data = 0;
JMF 0:6a929f0d0e58 190 uint16_t h_out = 0;
JMF 0:6a929f0d0e58 191 double h_temp = 0.0;
JMF 0:6a929f0d0e58 192 double hum = 0.0;
JMF 0:6a929f0d0e58 193
JMF 0:6a929f0d0e58 194 data = readRegister(_address, STATUS_REG);
JMF 0:6a929f0d0e58 195
JMF 0:6a929f0d0e58 196 if (data & HUMIDITY_READY) {
JMF 0:6a929f0d0e58 197 data = readRegister(_address, HUMIDITY_H_REG);
JMF 0:6a929f0d0e58 198 h_out = data << 8; // MSB
JMF 0:6a929f0d0e58 199 data = readRegister(_address, HUMIDITY_L_REG);
JMF 0:6a929f0d0e58 200 h_out |= data; // LSB
JMF 0:6a929f0d0e58 201
JMF 0:6a929f0d0e58 202 // Decode Humidity
JMF 0:6a929f0d0e58 203 hum = ((int16_t)(_h1_rH) - (int16_t)(_h0_rH))/2.0; // remove x2 multiple
JMF 0:6a929f0d0e58 204
JMF 0:6a929f0d0e58 205 // Calculate humidity in decimal of grade centigrades i.e. 15.0 = 150.
JMF 0:6a929f0d0e58 206 h_temp = (((int16_t)h_out - (int16_t)_H0_T0) * hum) / ((int16_t)_H1_T0 - (int16_t)_H0_T0);
JMF 0:6a929f0d0e58 207 hum = ((int16_t)_h0_rH) / 2.0; // remove x2 multiple
JMF 0:6a929f0d0e58 208 _humidity = (int16_t)((hum + h_temp)); // provide signed % measurement unit
JMF 0:6a929f0d0e58 209 }
JMF 0:6a929f0d0e58 210 return _humidity;
JMF 0:6a929f0d0e58 211 }
JMF 0:6a929f0d0e58 212
JMF 0:6a929f0d0e58 213
JMF 0:6a929f0d0e58 214
JMF 0:6a929f0d0e58 215 double HTS221::readTemperature(void) {
JMF 0:6a929f0d0e58 216 uint8_t data = 0;
JMF 0:6a929f0d0e58 217 uint16_t t_out = 0;
JMF 0:6a929f0d0e58 218 double t_temp = 0.0;
JMF 0:6a929f0d0e58 219 double deg = 0.0;
JMF 0:6a929f0d0e58 220
JMF 0:6a929f0d0e58 221 data = readRegister(_address, STATUS_REG);
JMF 0:6a929f0d0e58 222
JMF 0:6a929f0d0e58 223 if (data & TEMPERATURE_READY) {
JMF 0:6a929f0d0e58 224
JMF 0:6a929f0d0e58 225 data= readRegister(_address, TEMP_H_REG);
JMF 0:6a929f0d0e58 226 t_out = data << 8; // MSB
JMF 0:6a929f0d0e58 227 data = readRegister(_address, TEMP_L_REG);
JMF 0:6a929f0d0e58 228 t_out |= data; // LSB
JMF 0:6a929f0d0e58 229
JMF 0:6a929f0d0e58 230 // Decode Temperature
JMF 0:6a929f0d0e58 231 deg = ((int16_t)(_T1_degC) - (int16_t)(_T0_degC))/8.0; // remove x8 multiple
JMF 0:6a929f0d0e58 232
JMF 0:6a929f0d0e58 233 // Calculate Temperature in decimal of grade centigrades i.e. 15.0 = 150.
JMF 0:6a929f0d0e58 234 t_temp = (((int16_t)t_out - (int16_t)_T0_OUT) * deg) / ((int16_t)_T1_OUT - (int16_t)_T0_OUT);
JMF 0:6a929f0d0e58 235 deg = ((int16_t)_T0_degC) / 8.0; // remove x8 multiple
JMF 0:6a929f0d0e58 236 _temperature = deg + t_temp; // provide signed celsius measurement unit
JMF 0:6a929f0d0e58 237 }
JMF 0:6a929f0d0e58 238
JMF 0:6a929f0d0e58 239 return _temperature;
JMF 0:6a929f0d0e58 240 }