Srdjan Veljkovic / Mbed 2 deprecated AvnetATT_Pubnub

Avnet AT&T IoT Starter Kit demo for Pubnub

Dependencies:   FXOS8700CQ mbed

hts221_driver.cpp@30:48b43538e98b, 2016-07-20 (annotated)

Committer:
stefanrousseau
Date:
Wed Jul 20 04:01:03 2016 +0000
Revision:
30:48b43538e98b
Parent:
28:886833917643 
Changed the motion sensor instantiation from static to dynamic inside the function that uses it.  This is needed because the WNC on the shield corrupts the I2C bus during initialization.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
JMF 0:9d5134074d84 1
JMF 0:9d5134074d84 2 #include "HTS221.h"
JMF 0:9d5134074d84 3
JMF 0:9d5134074d84 4
JMF 0:9d5134074d84 5 // ------------------------------------------------------------------------------
JMF 0:9d5134074d84 6 //jmf -- define I2C pins and functions to read & write to I2C device
JMF 0:9d5134074d84 7
JMF 0:9d5134074d84 8 #include <string>
JMF 0:9d5134074d84 9 #include "mbed.h"
JMF 0:9d5134074d84 10
stefanrousseau 11:e6602513730f 11 #include "hardware.h"
JMF 28:886833917643 12 //I2C i2c(PTC11, PTC10); //SDA, SCL -- define the I2C pins being used. Defined in a
JMF 28:886833917643 13 //common locatioin since sensors also use I2C
JMF 0:9d5134074d84 14
JMF 0:9d5134074d84 15 // Read a single unsigned char from addressToRead and return it as a unsigned char
JMF 0:9d5134074d84 16 unsigned char HTS221::readRegister(unsigned char slaveAddress, unsigned char ToRead)
JMF 0:9d5134074d84 17 {
JMF 0:9d5134074d84 18 char data = ToRead;
JMF 0:9d5134074d84 19
stefanrousseau 30:48b43538e98b 20 i2c.write(slaveAddress, &data, 1, 1);
JMF 0:9d5134074d84 21 i2c.read(slaveAddress, &data, 1, 0);
JMF 0:9d5134074d84 22 return data;
JMF 0:9d5134074d84 23 }
JMF 0:9d5134074d84 24
JMF 0:9d5134074d84 25 // Writes a single unsigned char (dataToWrite) into regToWrite
JMF 0:9d5134074d84 26 int HTS221::writeRegister(unsigned char slaveAddress, unsigned char regToWrite, unsigned char dataToWrite)
JMF 0:9d5134074d84 27 {
JMF 0:9d5134074d84 28 const char data[] = {regToWrite, dataToWrite};
JMF 0:9d5134074d84 29
JMF 0:9d5134074d84 30 return i2c.write(slaveAddress,data,2,0);
JMF 0:9d5134074d84 31 }
JMF 0:9d5134074d84 32
JMF 0:9d5134074d84 33
JMF 0:9d5134074d84 34 //jmf end
JMF 0:9d5134074d84 35 // ------------------------------------------------------------------------------
JMF 0:9d5134074d84 36
JMF 1:af7a42f7d465 37 //static inline int humidityReady(uint8_t data) {
JMF 1:af7a42f7d465 38 // return (data & 0x02);
JMF 1:af7a42f7d465 39 //}
JMF 1:af7a42f7d465 40 //static inline int temperatureReady(uint8_t data) {
JMF 1:af7a42f7d465 41 // return (data & 0x01);
JMF 1:af7a42f7d465 42 //}
JMF 0:9d5134074d84 43
JMF 0:9d5134074d84 44
JMF 0:9d5134074d84 45 HTS221::HTS221(void) : _address(HTS221_ADDRESS)
JMF 0:9d5134074d84 46 {
JMF 0:9d5134074d84 47 _temperature = 0;
JMF 0:9d5134074d84 48 _humidity = 0;
JMF 0:9d5134074d84 49 }
JMF 0:9d5134074d84 50
JMF 0:9d5134074d84 51
JMF 0:9d5134074d84 52 int HTS221::begin(void)
JMF 0:9d5134074d84 53 {
JMF 0:9d5134074d84 54 uint8_t data;
JMF 0:9d5134074d84 55
JMF 0:9d5134074d84 56 data = readRegister(_address, WHO_AM_I);
JMF 0:9d5134074d84 57 if (data == WHO_AM_I_RETURN){
JMF 0:9d5134074d84 58 if (activate()){
JMF 0:9d5134074d84 59 storeCalibration();
JMF 0:9d5134074d84 60 return data;
JMF 0:9d5134074d84 61 }
JMF 0:9d5134074d84 62 }
JMF 0:9d5134074d84 63
JMF 0:9d5134074d84 64 return 0;
JMF 0:9d5134074d84 65 }
JMF 0:9d5134074d84 66
JMF 0:9d5134074d84 67 int
JMF 0:9d5134074d84 68 HTS221::storeCalibration(void)
JMF 0:9d5134074d84 69 {
JMF 0:9d5134074d84 70 uint8_t data;
JMF 0:9d5134074d84 71 uint16_t tmp;
JMF 0:9d5134074d84 72
JMF 0:9d5134074d84 73 for (int reg=CALIB_START; reg<=CALIB_END; reg++) {
JMF 0:9d5134074d84 74 if ((reg!=CALIB_START+8) && (reg!=CALIB_START+9) && (reg!=CALIB_START+4)) {
JMF 0:9d5134074d84 75
JMF 0:9d5134074d84 76 data = readRegister(HTS221_ADDRESS, reg);
JMF 0:9d5134074d84 77
JMF 0:9d5134074d84 78 switch (reg) {
JMF 0:9d5134074d84 79 case CALIB_START:
JMF 0:9d5134074d84 80 _h0_rH = data;
JMF 0:9d5134074d84 81 break;
JMF 0:9d5134074d84 82 case CALIB_START+1:
JMF 0:9d5134074d84 83 _h1_rH = data;
JMF 0:9d5134074d84 84 break;
JMF 0:9d5134074d84 85 case CALIB_START+2:
JMF 0:9d5134074d84 86 _T0_degC = data;
JMF 0:9d5134074d84 87 break;
JMF 0:9d5134074d84 88 case CALIB_START+3:
JMF 0:9d5134074d84 89 _T1_degC = data;
JMF 0:9d5134074d84 90 break;
JMF 0:9d5134074d84 91
JMF 0:9d5134074d84 92 case CALIB_START+5:
JMF 0:9d5134074d84 93 tmp = _T0_degC;
JMF 0:9d5134074d84 94 _T0_degC = (data&0x3)<<8;
JMF 0:9d5134074d84 95 _T0_degC |= tmp;
JMF 0:9d5134074d84 96
JMF 0:9d5134074d84 97 tmp = _T1_degC;
JMF 0:9d5134074d84 98 _T1_degC = ((data&0xC)>>2)<<8;
JMF 0:9d5134074d84 99 _T1_degC |= tmp;
JMF 0:9d5134074d84 100 break;
JMF 0:9d5134074d84 101 case CALIB_START+6:
JMF 0:9d5134074d84 102 _H0_T0 = data;
JMF 0:9d5134074d84 103 break;
JMF 0:9d5134074d84 104 case CALIB_START+7:
JMF 0:9d5134074d84 105 _H0_T0 |= data<<8;
JMF 0:9d5134074d84 106 break;
JMF 0:9d5134074d84 107 case CALIB_START+0xA:
JMF 0:9d5134074d84 108 _H1_T0 = data;
JMF 0:9d5134074d84 109 break;
JMF 0:9d5134074d84 110 case CALIB_START+0xB:
JMF 0:9d5134074d84 111 _H1_T0 |= data <<8;
JMF 0:9d5134074d84 112 break;
JMF 0:9d5134074d84 113 case CALIB_START+0xC:
JMF 0:9d5134074d84 114 _T0_OUT = data;
JMF 0:9d5134074d84 115 break;
JMF 0:9d5134074d84 116 case CALIB_START+0xD:
JMF 0:9d5134074d84 117 _T0_OUT |= data << 8;
JMF 0:9d5134074d84 118 break;
JMF 0:9d5134074d84 119 case CALIB_START+0xE:
JMF 0:9d5134074d84 120 _T1_OUT = data;
JMF 0:9d5134074d84 121 break;
JMF 0:9d5134074d84 122 case CALIB_START+0xF:
JMF 0:9d5134074d84 123 _T1_OUT |= data << 8;
JMF 0:9d5134074d84 124 break;
JMF 0:9d5134074d84 125
JMF 0:9d5134074d84 126
JMF 0:9d5134074d84 127 case CALIB_START+8:
JMF 0:9d5134074d84 128 case CALIB_START+9:
JMF 0:9d5134074d84 129 case CALIB_START+4:
JMF 0:9d5134074d84 130 //DO NOTHING
JMF 0:9d5134074d84 131 break;
JMF 0:9d5134074d84 132
JMF 0:9d5134074d84 133 // to cover any possible error
JMF 0:9d5134074d84 134 default:
JMF 0:9d5134074d84 135 return false;
JMF 0:9d5134074d84 136 } /* switch */
JMF 0:9d5134074d84 137 } /* if */
JMF 0:9d5134074d84 138 } /* for */
JMF 0:9d5134074d84 139 return true;
JMF 0:9d5134074d84 140 }
JMF 0:9d5134074d84 141
JMF 0:9d5134074d84 142
JMF 0:9d5134074d84 143 int
JMF 0:9d5134074d84 144 HTS221::activate(void)
JMF 0:9d5134074d84 145 {
JMF 0:9d5134074d84 146 uint8_t data;
JMF 0:9d5134074d84 147
JMF 0:9d5134074d84 148 data = readRegister(_address, CTRL_REG1);
JMF 0:9d5134074d84 149 data |= POWER_UP;
JMF 0:9d5134074d84 150 data |= ODR0_SET;
JMF 0:9d5134074d84 151 writeRegister(_address, CTRL_REG1, data);
JMF 0:9d5134074d84 152
JMF 0:9d5134074d84 153 return true;
JMF 0:9d5134074d84 154 }
JMF 0:9d5134074d84 155
JMF 0:9d5134074d84 156
JMF 0:9d5134074d84 157 int HTS221::deactivate(void)
JMF 0:9d5134074d84 158 {
JMF 0:9d5134074d84 159 uint8_t data;
JMF 0:9d5134074d84 160
JMF 0:9d5134074d84 161 data = readRegister(_address, CTRL_REG1);
JMF 0:9d5134074d84 162 data &= ~POWER_UP;
JMF 0:9d5134074d84 163 writeRegister(_address, CTRL_REG1, data);
JMF 0:9d5134074d84 164 return true;
JMF 0:9d5134074d84 165 }
JMF 0:9d5134074d84 166
JMF 0:9d5134074d84 167
JMF 0:9d5134074d84 168 int
JMF 0:9d5134074d84 169 HTS221::bduActivate(void)
JMF 0:9d5134074d84 170 {
JMF 0:9d5134074d84 171 uint8_t data;
JMF 0:9d5134074d84 172
JMF 0:9d5134074d84 173 data = readRegister(_address, CTRL_REG1);
JMF 0:9d5134074d84 174 data |= BDU_SET;
JMF 0:9d5134074d84 175 writeRegister(_address, CTRL_REG1, data);
JMF 0:9d5134074d84 176
JMF 0:9d5134074d84 177 return true;
JMF 0:9d5134074d84 178 }
JMF 0:9d5134074d84 179
JMF 0:9d5134074d84 180
JMF 0:9d5134074d84 181 int
JMF 0:9d5134074d84 182 HTS221::bduDeactivate(void)
JMF 0:9d5134074d84 183 {
JMF 0:9d5134074d84 184 uint8_t data;
JMF 0:9d5134074d84 185
JMF 0:9d5134074d84 186 data = readRegister(_address, CTRL_REG1);
JMF 0:9d5134074d84 187 data &= ~BDU_SET;
JMF 0:9d5134074d84 188 writeRegister(_address, CTRL_REG1, data);
JMF 0:9d5134074d84 189 return true;
JMF 0:9d5134074d84 190 }
JMF 0:9d5134074d84 191
JMF 0:9d5134074d84 192
JMF 0:9d5134074d84 193 int
JMF 0:9d5134074d84 194 HTS221::readHumidity(void)
JMF 0:9d5134074d84 195 {
JMF 0:9d5134074d84 196 uint8_t data = 0;
JMF 0:9d5134074d84 197 uint16_t h_out = 0;
JMF 0:9d5134074d84 198 double h_temp = 0.0;
JMF 0:9d5134074d84 199 double hum = 0.0;
JMF 0:9d5134074d84 200
JMF 0:9d5134074d84 201 data = readRegister(_address, STATUS_REG);
JMF 0:9d5134074d84 202
JMF 0:9d5134074d84 203 if (data & HUMIDITY_READY) {
JMF 0:9d5134074d84 204 data = readRegister(_address, HUMIDITY_H_REG);
JMF 0:9d5134074d84 205 h_out = data << 8; // MSB
JMF 0:9d5134074d84 206 data = readRegister(_address, HUMIDITY_L_REG);
JMF 0:9d5134074d84 207 h_out |= data; // LSB
JMF 0:9d5134074d84 208
JMF 0:9d5134074d84 209 // Decode Humidity
JMF 0:9d5134074d84 210 hum = ((int16_t)(_h1_rH) - (int16_t)(_h0_rH))/2.0; // remove x2 multiple
JMF 0:9d5134074d84 211
JMF 0:9d5134074d84 212 // Calculate humidity in decimal of grade centigrades i.e. 15.0 = 150.
JMF 0:9d5134074d84 213 h_temp = (((int16_t)h_out - (int16_t)_H0_T0) * hum) / ((int16_t)_H1_T0 - (int16_t)_H0_T0);
JMF 0:9d5134074d84 214 hum = ((int16_t)_h0_rH) / 2.0; // remove x2 multiple
JMF 0:9d5134074d84 215 _humidity = (int16_t)((hum + h_temp)); // provide signed % measurement unit
JMF 0:9d5134074d84 216 }
JMF 0:9d5134074d84 217 return _humidity;
JMF 0:9d5134074d84 218 }
JMF 0:9d5134074d84 219
JMF 0:9d5134074d84 220
JMF 0:9d5134074d84 221
JMF 0:9d5134074d84 222 double
JMF 0:9d5134074d84 223 HTS221::readTemperature(void)
JMF 0:9d5134074d84 224 {
JMF 0:9d5134074d84 225 uint8_t data = 0;
JMF 0:9d5134074d84 226 uint16_t t_out = 0;
JMF 0:9d5134074d84 227 double t_temp = 0.0;
JMF 0:9d5134074d84 228 double deg = 0.0;
JMF 0:9d5134074d84 229
JMF 0:9d5134074d84 230 data = readRegister(_address, STATUS_REG);
JMF 0:9d5134074d84 231
JMF 0:9d5134074d84 232 if (data & TEMPERATURE_READY) {
JMF 0:9d5134074d84 233
JMF 0:9d5134074d84 234 data= readRegister(_address, TEMP_H_REG);
JMF 0:9d5134074d84 235 t_out = data << 8; // MSB
JMF 0:9d5134074d84 236 data = readRegister(_address, TEMP_L_REG);
JMF 0:9d5134074d84 237 t_out |= data; // LSB
JMF 0:9d5134074d84 238
JMF 0:9d5134074d84 239 // Decode Temperature
JMF 0:9d5134074d84 240 deg = ((int16_t)(_T1_degC) - (int16_t)(_T0_degC))/8.0; // remove x8 multiple
JMF 0:9d5134074d84 241
JMF 0:9d5134074d84 242 // Calculate Temperature in decimal of grade centigrades i.e. 15.0 = 150.
JMF 0:9d5134074d84 243 t_temp = (((int16_t)t_out - (int16_t)_T0_OUT) * deg) / ((int16_t)_T1_OUT - (int16_t)_T0_OUT);
JMF 0:9d5134074d84 244 deg = ((int16_t)_T0_degC) / 8.0; // remove x8 multiple
JMF 0:9d5134074d84 245 _temperature = deg + t_temp; // provide signed celsius measurement unit
JMF 0:9d5134074d84 246 }
JMF 0:9d5134074d84 247
JMF 0:9d5134074d84 248 return _temperature;
JMF 0:9d5134074d84 249 }