Jackson Sheu / Mbed 2 deprecated Final_project

IOT Greenhouse

Dependencies:   HC_SR04_Ultrasonic_Library PixelArrayBuffer Servo TSL2561 mbed-rtos mbed

th02.cpp@0:7ebf4813882d, 2018-05-01 (annotated)

Committer:
jsheu3
Date:
Tue May 01 13:59:00 2018 +0000
Revision:
0:7ebf4813882d
IOT Greenhouse

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jsheu3 0:7ebf4813882d 1 // **********************************************************************************
jsheu3 0:7ebf4813882d 2 // Driver definition for HopeRF TH02 temperature and humidity sensor
jsheu3 0:7ebf4813882d 3 // **********************************************************************************
jsheu3 0:7ebf4813882d 4 // Creative Commons Attrib Share-Alike License
jsheu3 0:7ebf4813882d 5 // You are free to use/extend this library but please abide with the CC-BY-SA license:
jsheu3 0:7ebf4813882d 6 // http://creativecommons.org/licenses/by-sa/4.0/
jsheu3 0:7ebf4813882d 7 //
jsheu3 0:7ebf4813882d 8 // For any explanation see TH02 sensor information at
jsheu3 0:7ebf4813882d 9 // http://www.hoperf.com/sensor/app/TH02.htm
jsheu3 0:7ebf4813882d 10 //
jsheu3 0:7ebf4813882d 11 // Code based on following datasheet
jsheu3 0:7ebf4813882d 12 // http://www.hoperf.com/upload/sensor/TH02_V1.1.pdf
jsheu3 0:7ebf4813882d 13 //
jsheu3 0:7ebf4813882d 14 // Written by Charles-Henri Hallard (http://hallard.me)
jsheu3 0:7ebf4813882d 15 //
jsheu3 0:7ebf4813882d 16 // History : V1.00 2014-07-14 - First release
jsheu3 0:7ebf4813882d 17 // V1.10 2015-04-13 - changed to Wire library instead of m_I2C
jsheu3 0:7ebf4813882d 18 //
jsheu3 0:7ebf4813882d 19 // All text above must be included in any redistribution.
jsheu3 0:7ebf4813882d 20 //
jsheu3 0:7ebf4813882d 21 // **********************************************************************************
jsheu3 0:7ebf4813882d 22 #include "th02.h"
jsheu3 0:7ebf4813882d 23 #include "mbed.h"
jsheu3 0:7ebf4813882d 24 #include "math.h"
jsheu3 0:7ebf4813882d 25
jsheu3 0:7ebf4813882d 26 // Class Constructor
jsheu3 0:7ebf4813882d 27
jsheu3 0:7ebf4813882d 28 TH02::TH02(PinName sda,PinName scl,uint8_t address): m_I2C(sda, scl)
jsheu3 0:7ebf4813882d 29 {
jsheu3 0:7ebf4813882d 30 _address = address; // m_I2C Module Address
jsheu3 0:7ebf4813882d 31 _last_temp = TH02_UNINITIALIZED_TEMP; // Last measured temperature (for linearization)
jsheu3 0:7ebf4813882d 32 _last_rh = TH02_UNINITIALIZED_RH; // Last measured RH
jsheu3 0:7ebf4813882d 33 }
jsheu3 0:7ebf4813882d 34
jsheu3 0:7ebf4813882d 35 TH02::~TH02()
jsheu3 0:7ebf4813882d 36 {
jsheu3 0:7ebf4813882d 37
jsheu3 0:7ebf4813882d 38 }
jsheu3 0:7ebf4813882d 39
jsheu3 0:7ebf4813882d 40
jsheu3 0:7ebf4813882d 41
jsheu3 0:7ebf4813882d 42 /* ======================================================================
jsheu3 0:7ebf4813882d 43 Function: writeCommand
jsheu3 0:7ebf4813882d 44 Purpose : write the "register address" value on m_I2C bus
jsheu3 0:7ebf4813882d 45 Input : register address
jsheu3 0:7ebf4813882d 46 true if we need to release the bus after (default yes)
jsheu3 0:7ebf4813882d 47 Output : Arduino Wire library return code (0 if ok)
jsheu3 0:7ebf4813882d 48 Comments:
jsheu3 0:7ebf4813882d 49 ====================================================================== */
jsheu3 0:7ebf4813882d 50 uint8_t TH02::writeCommand(uint8_t command, bool release)
jsheu3 0:7ebf4813882d 51 {int iError;
jsheu3 0:7ebf4813882d 52 (void) m_I2C.start();
jsheu3 0:7ebf4813882d 53 //Wire.beginTransmission(_address);
jsheu3 0:7ebf4813882d 54 iError=m_I2C.write(_address);// send adress of i2c slave
jsheu3 0:7ebf4813882d 55
jsheu3 0:7ebf4813882d 56 if (iError==1)
jsheu3 0:7ebf4813882d 57 {
jsheu3 0:7ebf4813882d 58 // Wire.write(command) ;
jsheu3 0:7ebf4813882d 59 iError= m_I2C.write(command);
jsheu3 0:7ebf4813882d 60 }
jsheu3 0:7ebf4813882d 61 if (release==true)
jsheu3 0:7ebf4813882d 62 { m_I2C.stop();// return stop error code
jsheu3 0:7ebf4813882d 63 }
jsheu3 0:7ebf4813882d 64 if (iError==1) iError=0;// ack received
jsheu3 0:7ebf4813882d 65 else iError=1;// no ack
jsheu3 0:7ebf4813882d 66 return iError;
jsheu3 0:7ebf4813882d 67 }
jsheu3 0:7ebf4813882d 68
jsheu3 0:7ebf4813882d 69 /* ======================================================================
jsheu3 0:7ebf4813882d 70 Function: writeRegister
jsheu3 0:7ebf4813882d 71 Purpose : write a value on the designed register address on m_I2C bus
jsheu3 0:7ebf4813882d 72 Input : register address
jsheu3 0:7ebf4813882d 73 value to write
jsheu3 0:7ebf4813882d 74 Output : Arduino Wire library return code (0 if ok)
jsheu3 0:7ebf4813882d 75 Comments:
jsheu3 0:7ebf4813882d 76 ====================================================================== */
jsheu3 0:7ebf4813882d 77 uint8_t TH02::writeRegister(uint8_t reg, uint8_t value)
jsheu3 0:7ebf4813882d 78 { int iError;
jsheu3 0:7ebf4813882d 79
jsheu3 0:7ebf4813882d 80 bool ret = false;
jsheu3 0:7ebf4813882d 81
jsheu3 0:7ebf4813882d 82 //Wire.beginTransmission(_address);
jsheu3 0:7ebf4813882d 83 (void) m_I2C.start();
jsheu3 0:7ebf4813882d 84 iError=m_I2C.write(_address);// send adress of i2c slave
jsheu3 0:7ebf4813882d 85 // Wire.write(reg);
jsheu3 0:7ebf4813882d 86 if (iError==1){
jsheu3 0:7ebf4813882d 87
jsheu3 0:7ebf4813882d 88 iError= m_I2C.write(reg);
jsheu3 0:7ebf4813882d 89
jsheu3 0:7ebf4813882d 90 // Wire.write(value);
jsheu3 0:7ebf4813882d 91 (void) m_I2C.write(value);
jsheu3 0:7ebf4813882d 92 }
jsheu3 0:7ebf4813882d 93 // return Wire.endTransmission();
jsheu3 0:7ebf4813882d 94 m_I2C.stop();// return stop error code
jsheu3 0:7ebf4813882d 95 if (iError==1) iError=0;// ack received
jsheu3 0:7ebf4813882d 96 else iError=1;// no ack
jsheu3 0:7ebf4813882d 97 return iError;
jsheu3 0:7ebf4813882d 98 }
jsheu3 0:7ebf4813882d 99
jsheu3 0:7ebf4813882d 100 /* ======================================================================
jsheu3 0:7ebf4813882d 101 Function: readRegister
jsheu3 0:7ebf4813882d 102 Purpose : read a register address value on m_I2C bus
jsheu3 0:7ebf4813882d 103 Input : register address
jsheu3 0:7ebf4813882d 104 pointer where the return value will be filled
jsheu3 0:7ebf4813882d 105 Output : Arduino Wire library return code (0 if ok)
jsheu3 0:7ebf4813882d 106 Comments:
jsheu3 0:7ebf4813882d 107 ====================================================================== */
jsheu3 0:7ebf4813882d 108 uint8_t TH02::readRegister(uint8_t reg, uint8_t * value)
jsheu3 0:7ebf4813882d 109 {
jsheu3 0:7ebf4813882d 110 uint8_t ret ;
jsheu3 0:7ebf4813882d 111 int iAck,iRedVal,iError;
jsheu3 0:7ebf4813882d 112 // Send a register reading command
jsheu3 0:7ebf4813882d 113 // but DO NOT release the m_I2C bus
jsheu3 0:7ebf4813882d 114 // (void) m_I2C.start();
jsheu3 0:7ebf4813882d 115 // iError=m_I2C.write(_address);// send adress of i2c slave
jsheu3 0:7ebf4813882d 116
jsheu3 0:7ebf4813882d 117 //if (iError==1)
jsheu3 0:7ebf4813882d 118
jsheu3 0:7ebf4813882d 119 ret = writeCommand(reg, false);
jsheu3 0:7ebf4813882d 120
jsheu3 0:7ebf4813882d 121 if ( ret == 0) //if command ok
jsheu3 0:7ebf4813882d 122 {
jsheu3 0:7ebf4813882d 123 // Wire.requestFrom( (uint8_t) _address, (uint8_t) 1);
jsheu3 0:7ebf4813882d 124 (void) m_I2C.start();
jsheu3 0:7ebf4813882d 125 iError=m_I2C.write(_address+0x01);// send adress of i2c slave in read mode
jsheu3 0:7ebf4813882d 126 iRedVal=m_I2C.read(0);//send non ack
jsheu3 0:7ebf4813882d 127 // if (Wire.available() != 1)
jsheu3 0:7ebf4813882d 128 /*if (iAck != 1)
jsheu3 0:7ebf4813882d 129
jsheu3 0:7ebf4813882d 130 // Other error as Wire library
jsheu3 0:7ebf4813882d 131 ret = 4;
jsheu3 0:7ebf4813882d 132 else
jsheu3 0:7ebf4813882d 133 // grab the value*/
jsheu3 0:7ebf4813882d 134 *value = iRedVal; // return Red value by ref
jsheu3 0:7ebf4813882d 135
jsheu3 0:7ebf4813882d 136 //}
jsheu3 0:7ebf4813882d 137
jsheu3 0:7ebf4813882d 138 // Ok now we have finished
jsheu3 0:7ebf4813882d 139 // Wire.endTransmission();
jsheu3 0:7ebf4813882d 140
jsheu3 0:7ebf4813882d 141 }
jsheu3 0:7ebf4813882d 142 (void) m_I2C.stop();// return stop error code
jsheu3 0:7ebf4813882d 143 return ret;
jsheu3 0:7ebf4813882d 144 }
jsheu3 0:7ebf4813882d 145
jsheu3 0:7ebf4813882d 146 /* ======================================================================
jsheu3 0:7ebf4813882d 147 Function: getId
jsheu3 0:7ebf4813882d 148 Purpose : Get device ID register
jsheu3 0:7ebf4813882d 149 Input : pointer where the return value will be filled
jsheu3 0:7ebf4813882d 150 Output : Arduino Wire library return code (0 if ok)
jsheu3 0:7ebf4813882d 151 Comments: -
jsheu3 0:7ebf4813882d 152 ====================================================================== */
jsheu3 0:7ebf4813882d 153 uint8_t TH02::getId(uint8_t * pvalue)
jsheu3 0:7ebf4813882d 154 {
jsheu3 0:7ebf4813882d 155 return (readRegister(TH02_ID, pvalue));
jsheu3 0:7ebf4813882d 156 }
jsheu3 0:7ebf4813882d 157
jsheu3 0:7ebf4813882d 158 /* ======================================================================
jsheu3 0:7ebf4813882d 159 Function: getStatus
jsheu3 0:7ebf4813882d 160 Purpose : Get device status register
jsheu3 0:7ebf4813882d 161 Input : pointer where the return value will be filled
jsheu3 0:7ebf4813882d 162 Output : Arduino Wire library return code (0 if ok)
jsheu3 0:7ebf4813882d 163 Comments:
jsheu3 0:7ebf4813882d 164 ====================================================================== */
jsheu3 0:7ebf4813882d 165 uint8_t TH02::getStatus(uint8_t * pvalue)
jsheu3 0:7ebf4813882d 166 {
jsheu3 0:7ebf4813882d 167 return (readRegister(TH02_STATUS, pvalue));
jsheu3 0:7ebf4813882d 168 }
jsheu3 0:7ebf4813882d 169
jsheu3 0:7ebf4813882d 170 /* ======================================================================
jsheu3 0:7ebf4813882d 171 Function: isConverting
jsheu3 0:7ebf4813882d 172 Purpose : Indicate if a temperature or humidity conversion is in progress
jsheu3 0:7ebf4813882d 173 Input : -
jsheu3 0:7ebf4813882d 174 Output : true if conversion in progress false otherwise
jsheu3 0:7ebf4813882d 175 Comments:
jsheu3 0:7ebf4813882d 176 ====================================================================== */
jsheu3 0:7ebf4813882d 177 bool TH02::isConverting(void)
jsheu3 0:7ebf4813882d 178 {
jsheu3 0:7ebf4813882d 179 uint8_t status;
jsheu3 0:7ebf4813882d 180 // Get status and check RDY bit
jsheu3 0:7ebf4813882d 181 if ( getStatus(&status) == 0)
jsheu3 0:7ebf4813882d 182 {
jsheu3 0:7ebf4813882d 183 //{ printf("\n lecture status %x",status);
jsheu3 0:7ebf4813882d 184 if ( (status & TH02_STATUS_RDY) ==1 )
jsheu3 0:7ebf4813882d 185 return true;
jsheu3 0:7ebf4813882d 186 }
jsheu3 0:7ebf4813882d 187 return false;
jsheu3 0:7ebf4813882d 188 }
jsheu3 0:7ebf4813882d 189
jsheu3 0:7ebf4813882d 190 /* ======================================================================
jsheu3 0:7ebf4813882d 191 Function: getConfig
jsheu3 0:7ebf4813882d 192 Purpose : Get device configuration register
jsheu3 0:7ebf4813882d 193 Input : pointer where the return value will be filled
jsheu3 0:7ebf4813882d 194 Output : Arduino Wire library return code (0 if ok)
jsheu3 0:7ebf4813882d 195 Comments:
jsheu3 0:7ebf4813882d 196 ====================================================================== */
jsheu3 0:7ebf4813882d 197 uint8_t TH02::getConfig(uint8_t * pvalue)
jsheu3 0:7ebf4813882d 198 {
jsheu3 0:7ebf4813882d 199 return (readRegister(TH02_CONFIG, pvalue));
jsheu3 0:7ebf4813882d 200 }
jsheu3 0:7ebf4813882d 201
jsheu3 0:7ebf4813882d 202 /* ======================================================================
jsheu3 0:7ebf4813882d 203 Function: setConfig
jsheu3 0:7ebf4813882d 204 Purpose : Set device configuration register
jsheu3 0:7ebf4813882d 205 Input : value to set
jsheu3 0:7ebf4813882d 206 Output : true if succeded, false otherwise
jsheu3 0:7ebf4813882d 207 Comments:
jsheu3 0:7ebf4813882d 208 ====================================================================== */
jsheu3 0:7ebf4813882d 209 uint8_t TH02::setConfig(uint8_t config)
jsheu3 0:7ebf4813882d 210 {
jsheu3 0:7ebf4813882d 211 return (writeRegister(TH02_CONFIG, config));
jsheu3 0:7ebf4813882d 212 }
jsheu3 0:7ebf4813882d 213
jsheu3 0:7ebf4813882d 214 /* ======================================================================
jsheu3 0:7ebf4813882d 215 Function: startTempConv
jsheu3 0:7ebf4813882d 216 Purpose : Start a temperature conversion
jsheu3 0:7ebf4813882d 217 Input : - fastmode true to enable fast conversion
jsheu3 0:7ebf4813882d 218 - heater true to enable heater
jsheu3 0:7ebf4813882d 219 Output : true if succeded, false otherwise
jsheu3 0:7ebf4813882d 220 Comments: if heater enabled, it will not be auto disabled
jsheu3 0:7ebf4813882d 221 ====================================================================== */
jsheu3 0:7ebf4813882d 222 uint8_t TH02::startTempConv(bool fastmode, bool heater)
jsheu3 0:7ebf4813882d 223 {
jsheu3 0:7ebf4813882d 224 // init configuration register to start and temperature
jsheu3 0:7ebf4813882d 225 uint8_t config = TH02_CONFIG_START | TH02_CONFIG_TEMP;
jsheu3 0:7ebf4813882d 226
jsheu3 0:7ebf4813882d 227 // set fast mode and heater if asked
jsheu3 0:7ebf4813882d 228 if (fastmode) config |= TH02_CONFIG_FAST;
jsheu3 0:7ebf4813882d 229 if (heater) config |= TH02_CONFIG_HEAT;
jsheu3 0:7ebf4813882d 230
jsheu3 0:7ebf4813882d 231 // write to configuration register
jsheu3 0:7ebf4813882d 232 return ( setConfig( config ) );
jsheu3 0:7ebf4813882d 233 }
jsheu3 0:7ebf4813882d 234
jsheu3 0:7ebf4813882d 235 /* ======================================================================
jsheu3 0:7ebf4813882d 236 Function: startRHConv
jsheu3 0:7ebf4813882d 237 Purpose : Start a relative humidity conversion
jsheu3 0:7ebf4813882d 238 Input : - fastmode true to enable fast conversion
jsheu3 0:7ebf4813882d 239 - heater true to enable heater
jsheu3 0:7ebf4813882d 240 Output : true if succeded, false otherwise
jsheu3 0:7ebf4813882d 241 Comments: if heater enabled, it will not be auto disabled
jsheu3 0:7ebf4813882d 242 ====================================================================== */
jsheu3 0:7ebf4813882d 243 uint8_t TH02::startRHConv(bool fastmode, bool heater)
jsheu3 0:7ebf4813882d 244 {
jsheu3 0:7ebf4813882d 245 // init configuration register to start and no temperature (so RH)
jsheu3 0:7ebf4813882d 246 uint8_t config = TH02_CONFIG_START;
jsheu3 0:7ebf4813882d 247
jsheu3 0:7ebf4813882d 248 // set fast mode and heater if asked
jsheu3 0:7ebf4813882d 249 if (fastmode) config |= TH02_CONFIG_FAST;
jsheu3 0:7ebf4813882d 250 if (heater) config |= TH02_CONFIG_HEAT;
jsheu3 0:7ebf4813882d 251
jsheu3 0:7ebf4813882d 252 // write to configuration register
jsheu3 0:7ebf4813882d 253 return ( setConfig( config ) );
jsheu3 0:7ebf4813882d 254 }
jsheu3 0:7ebf4813882d 255
jsheu3 0:7ebf4813882d 256 /* ======================================================================
jsheu3 0:7ebf4813882d 257 Function: waitEndConversion
jsheu3 0:7ebf4813882d 258 Purpose : wait for a temperature or RH conversion is done
jsheu3 0:7ebf4813882d 259 Input :
jsheu3 0:7ebf4813882d 260 Output : delay in ms the process took.
jsheu3 0:7ebf4813882d 261 Comments: if return >= TH02_CONVERSION_TIME_OUT, time out occured
jsheu3 0:7ebf4813882d 262 ====================================================================== */
jsheu3 0:7ebf4813882d 263 uint8_t TH02::waitEndConversion(void)
jsheu3 0:7ebf4813882d 264 {
jsheu3 0:7ebf4813882d 265 // okay this is basic approach not so accurate
jsheu3 0:7ebf4813882d 266 // but avoid using long and millis()
jsheu3 0:7ebf4813882d 267 uint8_t time_out = 0;
jsheu3 0:7ebf4813882d 268
jsheu3 0:7ebf4813882d 269 // loop until conversion done or duration >= time out
jsheu3 0:7ebf4813882d 270 while (isConverting() && time_out <= TH02_CONVERSION_TIME_OUT )
jsheu3 0:7ebf4813882d 271 {
jsheu3 0:7ebf4813882d 272 ++time_out;
jsheu3 0:7ebf4813882d 273 wait_ms(1);
jsheu3 0:7ebf4813882d 274 }
jsheu3 0:7ebf4813882d 275
jsheu3 0:7ebf4813882d 276 // return approx time of conversion
jsheu3 0:7ebf4813882d 277 return (time_out);
jsheu3 0:7ebf4813882d 278 }
jsheu3 0:7ebf4813882d 279
jsheu3 0:7ebf4813882d 280 /* ======================================================================
jsheu3 0:7ebf4813882d 281 Function: roundInt
jsheu3 0:7ebf4813882d 282 Purpose : round a float value to int
jsheu3 0:7ebf4813882d 283 Input : float value
jsheu3 0:7ebf4813882d 284 Output : int value rounded
jsheu3 0:7ebf4813882d 285 Comments:
jsheu3 0:7ebf4813882d 286 ====================================================================== */
jsheu3 0:7ebf4813882d 287 int16_t TH02::roundInt(float value)
jsheu3 0:7ebf4813882d 288 {
jsheu3 0:7ebf4813882d 289
jsheu3 0:7ebf4813882d 290 // check positive number and do round
jsheu3 0:7ebf4813882d 291 if (value >= 0.0f)
jsheu3 0:7ebf4813882d 292 value = floor(value + 0.5f);
jsheu3 0:7ebf4813882d 293 else
jsheu3 0:7ebf4813882d 294 value = ceil(value - 0.5f);
jsheu3 0:7ebf4813882d 295
jsheu3 0:7ebf4813882d 296 // return int value
jsheu3 0:7ebf4813882d 297 return (static_cast<int16_t>(value));
jsheu3 0:7ebf4813882d 298 }
jsheu3 0:7ebf4813882d 299
jsheu3 0:7ebf4813882d 300 /* to avoid math library may I need to test something
jsheu3 0:7ebf4813882d 301 like that
jsheu3 0:7ebf4813882d 302 float TH02::showDecimals(float x, int numDecimals)
jsheu3 0:7ebf4813882d 303 {
jsheu3 0:7ebf4813882d 304 int y=x;
jsheu3 0:7ebf4813882d 305 double z=x-y;
jsheu3 0:7ebf4813882d 306 double m=pow(10,numDecimals);
jsheu3 0:7ebf4813882d 307 double q=z*m;
jsheu3 0:7ebf4813882d 308 double r=round(q);
jsheu3 0:7ebf4813882d 309 return static_cast<double>(y)+(1.0/m)*r;
jsheu3 0:7ebf4813882d 310 }
jsheu3 0:7ebf4813882d 311 */
jsheu3 0:7ebf4813882d 312
jsheu3 0:7ebf4813882d 313 /* ======================================================================
jsheu3 0:7ebf4813882d 314 Function: getConversionValue
jsheu3 0:7ebf4813882d 315 Purpose : return the last converted value to int * 10 to have 1 digit prec.
jsheu3 0:7ebf4813882d 316 Input : float value
jsheu3 0:7ebf4813882d 317 Output : value rounded but multiplied per 10 or TH02_UNDEFINED_VALUE on err
jsheu3 0:7ebf4813882d 318 Comments: - temperature and rh raw values (*100) are stored for raw purpose
jsheu3 0:7ebf4813882d 319 - the configuration register is checked to see if last conv was
jsheu3 0:7ebf4813882d 320 a temperature or humidity conversion
jsheu3 0:7ebf4813882d 321 ====================================================================== */
jsheu3 0:7ebf4813882d 322 int16_t TH02::getConversionValue(void)
jsheu3 0:7ebf4813882d 323 { char cMaChaine[3];
jsheu3 0:7ebf4813882d 324 int iError;
jsheu3 0:7ebf4813882d 325 int32_t result=0 ;
jsheu3 0:7ebf4813882d 326 uint8_t config;
jsheu3 0:7ebf4813882d 327 int16_t ret = TH02_UNDEFINED_VALUE;
jsheu3 0:7ebf4813882d 328
jsheu3 0:7ebf4813882d 329 // Prepare reading address of ADC data result
jsheu3 0:7ebf4813882d 330 if ( writeCommand(TH02_DATAh, false) == 0 )
jsheu3 0:7ebf4813882d 331 {
jsheu3 0:7ebf4813882d 332 // Read 2 bytes adc data result MSB and LSB from TH02
jsheu3 0:7ebf4813882d 333 //Wire.requestFrom( (uint8_t) _address, (uint8_t) 2);
jsheu3 0:7ebf4813882d 334
jsheu3 0:7ebf4813882d 335
jsheu3 0:7ebf4813882d 336 iError= m_I2C.read (_address,cMaChaine,2,false);
jsheu3 0:7ebf4813882d 337
jsheu3 0:7ebf4813882d 338
jsheu3 0:7ebf4813882d 339
jsheu3 0:7ebf4813882d 340
jsheu3 0:7ebf4813882d 341 // we got 2 bytes ?
jsheu3 0:7ebf4813882d 342 // if (Wire.available() == 2)
jsheu3 0:7ebf4813882d 343 if (iError == 0 )
jsheu3 0:7ebf4813882d 344 {
jsheu3 0:7ebf4813882d 345 // convert number
jsheu3 0:7ebf4813882d 346 // result = Wire.read() << 8;
jsheu3 0:7ebf4813882d 347 // result |= Wire.read();
jsheu3 0:7ebf4813882d 348 result=(cMaChaine[0]<<8 )|cMaChaine[1];
jsheu3 0:7ebf4813882d 349 // Get configuration to know what was asked last time
jsheu3 0:7ebf4813882d 350 if (getConfig(&config)==0)
jsheu3 0:7ebf4813882d 351 {
jsheu3 0:7ebf4813882d 352 // last conversion was temperature ?
jsheu3 0:7ebf4813882d 353 if( config & TH02_CONFIG_TEMP)
jsheu3 0:7ebf4813882d 354 {
jsheu3 0:7ebf4813882d 355 result >>= 2; // remove 2 unused LSB bits
jsheu3 0:7ebf4813882d 356 result *= 100; // multiply per 100 to have int value with 2 decimal
jsheu3 0:7ebf4813882d 357 result /= 32; // now apply datasheet formula
jsheu3 0:7ebf4813882d 358 if(result >= 5000)
jsheu3 0:7ebf4813882d 359 {
jsheu3 0:7ebf4813882d 360 result -= 5000;
jsheu3 0:7ebf4813882d 361 }
jsheu3 0:7ebf4813882d 362 else
jsheu3 0:7ebf4813882d 363 {
jsheu3 0:7ebf4813882d 364 result -= 5000;
jsheu3 0:7ebf4813882d 365 result = -result;
jsheu3 0:7ebf4813882d 366 }
jsheu3 0:7ebf4813882d 367
jsheu3 0:7ebf4813882d 368 // now result contain temperature * 100
jsheu3 0:7ebf4813882d 369 // so 2134 is 21.34 C
jsheu3 0:7ebf4813882d 370
jsheu3 0:7ebf4813882d 371 // Save raw value
jsheu3 0:7ebf4813882d 372 _last_temp = result;
jsheu3 0:7ebf4813882d 373 }
jsheu3 0:7ebf4813882d 374 // it was RH conversion
jsheu3 0:7ebf4813882d 375 else
jsheu3 0:7ebf4813882d 376 {
jsheu3 0:7ebf4813882d 377 result >>= 4; // remove 4 unused LSB bits
jsheu3 0:7ebf4813882d 378 result *= 100; // multiply per 100 to have int value with 2 decimal
jsheu3 0:7ebf4813882d 379 result /= 16; // now apply datasheet formula
jsheu3 0:7ebf4813882d 380 result -= 2400;
jsheu3 0:7ebf4813882d 381
jsheu3 0:7ebf4813882d 382 // now result contain humidity * 100
jsheu3 0:7ebf4813882d 383 // so 4567 is 45.67 % RH
jsheu3 0:7ebf4813882d 384 _last_rh = result;
jsheu3 0:7ebf4813882d 385 }
jsheu3 0:7ebf4813882d 386
jsheu3 0:7ebf4813882d 387 // remember result value is multiplied by 10 to avoid float calculation later
jsheu3 0:7ebf4813882d 388 // so humidity of 45.6% is 456 and temp of 21.3 C is 213
jsheu3 0:7ebf4813882d 389 ret = roundInt(result/10.0f);
jsheu3 0:7ebf4813882d 390 }
jsheu3 0:7ebf4813882d 391 } // if got 2 bytes from m_I2C
jsheu3 0:7ebf4813882d 392
jsheu3 0:7ebf4813882d 393 // Ok now we have finished with m_I2C, release
jsheu3 0:7ebf4813882d 394 //Wire.endTransmission();
jsheu3 0:7ebf4813882d 395
jsheu3 0:7ebf4813882d 396
jsheu3 0:7ebf4813882d 397 } // if write command TH02_DATAh
jsheu3 0:7ebf4813882d 398 (void) m_I2C.stop();
jsheu3 0:7ebf4813882d 399 return ret;
jsheu3 0:7ebf4813882d 400 }
jsheu3 0:7ebf4813882d 401
jsheu3 0:7ebf4813882d 402 /* ======================================================================
jsheu3 0:7ebf4813882d 403 Function: getConpensatedRH
jsheu3 0:7ebf4813882d 404 Purpose : return the compensated calulated humidity
jsheu3 0:7ebf4813882d 405 Input : true if we want to round value to 1 digit precision, else 2
jsheu3 0:7ebf4813882d 406 Output : the compensed RH value (rounded or not)
jsheu3 0:7ebf4813882d 407 Comments:
jsheu3 0:7ebf4813882d 408 ====================================================================== */
jsheu3 0:7ebf4813882d 409 int16_t TH02::getConpensatedRH(bool round)
jsheu3 0:7ebf4813882d 410 {
jsheu3 0:7ebf4813882d 411 float rhvalue ;
jsheu3 0:7ebf4813882d 412 float rhlinear ;
jsheu3 0:7ebf4813882d 413 int16_t ret = TH02_UNDEFINED_VALUE;
jsheu3 0:7ebf4813882d 414
jsheu3 0:7ebf4813882d 415 // did we had a previous measure RH
jsheu3 0:7ebf4813882d 416 if (_last_rh != TH02_UNINITIALIZED_RH)
jsheu3 0:7ebf4813882d 417 {
jsheu3 0:7ebf4813882d 418 // now we're float restore real value RH value
jsheu3 0:7ebf4813882d 419 rhvalue = (float) _last_rh / 100.0 ;
jsheu3 0:7ebf4813882d 420
jsheu3 0:7ebf4813882d 421 // apply linear compensation
jsheu3 0:7ebf4813882d 422 rhlinear = rhvalue - ((rhvalue*rhvalue) * TH02_A2 + rhvalue * TH02_A1 + TH02_A0);
jsheu3 0:7ebf4813882d 423
jsheu3 0:7ebf4813882d 424 // correct value
jsheu3 0:7ebf4813882d 425 rhvalue = rhlinear;
jsheu3 0:7ebf4813882d 426
jsheu3 0:7ebf4813882d 427 // do we have a initialized temperature value ?
jsheu3 0:7ebf4813882d 428 if (_last_temp != TH02_UNINITIALIZED_TEMP )
jsheu3 0:7ebf4813882d 429 {
jsheu3 0:7ebf4813882d 430 // Apply Temperature compensation
jsheu3 0:7ebf4813882d 431 // remember last temp was stored * 100
jsheu3 0:7ebf4813882d 432 rhvalue += ((_last_temp/100.0) - 30.0) * (rhlinear * TH02_Q1 + TH02_Q0);
jsheu3 0:7ebf4813882d 433 }
jsheu3 0:7ebf4813882d 434
jsheu3 0:7ebf4813882d 435 // now get back * 100 to have int with 2 digit precision
jsheu3 0:7ebf4813882d 436 rhvalue *= 100;
jsheu3 0:7ebf4813882d 437
jsheu3 0:7ebf4813882d 438 // do we need to round to 1 digit ?
jsheu3 0:7ebf4813882d 439 if (round)
jsheu3 0:7ebf4813882d 440 {
jsheu3 0:7ebf4813882d 441 // remember result value is multiplied by 10 to avoid float calculation later
jsheu3 0:7ebf4813882d 442 // so humidity of 45.6% is 456
jsheu3 0:7ebf4813882d 443 ret = roundInt(rhvalue/10.0f);
jsheu3 0:7ebf4813882d 444 }
jsheu3 0:7ebf4813882d 445 else
jsheu3 0:7ebf4813882d 446 {
jsheu3 0:7ebf4813882d 447 ret = (int16_t) rhvalue;
jsheu3 0:7ebf4813882d 448 }
jsheu3 0:7ebf4813882d 449 }
jsheu3 0:7ebf4813882d 450
jsheu3 0:7ebf4813882d 451 return ret;
jsheu3 0:7ebf4813882d 452 }
jsheu3 0:7ebf4813882d 453
jsheu3 0:7ebf4813882d 454 /* ======================================================================
jsheu3 0:7ebf4813882d 455 Function: getLastRawRH
jsheu3 0:7ebf4813882d 456 Purpose : return the raw humidity * 100
jsheu3 0:7ebf4813882d 457 Input :
jsheu3 0:7ebf4813882d 458 Output : int value (ie 4123 for 41.23%)
jsheu3 0:7ebf4813882d 459 Comments:
jsheu3 0:7ebf4813882d 460 ====================================================================== */
jsheu3 0:7ebf4813882d 461 int32_t TH02::getLastRawRH(void)
jsheu3 0:7ebf4813882d 462 {
jsheu3 0:7ebf4813882d 463 return _last_rh;
jsheu3 0:7ebf4813882d 464 }
jsheu3 0:7ebf4813882d 465
jsheu3 0:7ebf4813882d 466 /* ======================================================================
jsheu3 0:7ebf4813882d 467 Function: getLastRawTemp
jsheu3 0:7ebf4813882d 468 Purpose : return the raw temperature value * 100
jsheu3 0:7ebf4813882d 469 Input :
jsheu3 0:7ebf4813882d 470 Output : int value (ie 2124 for 21.24 C)
jsheu3 0:7ebf4813882d 471 Comments:
jsheu3 0:7ebf4813882d 472 ====================================================================== */
jsheu3 0:7ebf4813882d 473 int32_t TH02::getLastRawTemp(void)
jsheu3 0:7ebf4813882d 474 {
jsheu3 0:7ebf4813882d 475 return _last_temp;
jsheu3 0:7ebf4813882d 476 }