AT&T IoT / Mbed OS ATT_AWS_IoT_demo Featured

Demo application for using the AT&T IoT Starter Kit Powered by AWS.

Dependencies:   SDFileSystem

Fork of ATT_AWS_IoT_demo by Anthony Phillips

IoT Starter Kit Powered by AWS Demo

This program demonstrates the AT&T IoT Starter Kit sending data directly into AWS IoT. It's explained and used in the Getting Started with the IoT Starter Kit Powered by AWS on starterkit.att.com.

What's required

  • AT&T IoT LTE Add-on (also known as the Cellular Shield)
  • NXP K64F - for programming
  • microSD card - used to store your AWS security credentials
  • AWS account
  • Python, locally installed

If you don't already have an IoT Starter Kit, you can purchase a kit here. The IoT Starter Kit Powered by AWS includes the LTE cellular shield, K64F, and a microSD card.

Sensors/Temperature/hts221_driver.cpp@27:2f486c766854, 2017-02-07 (annotated)

Committer:
rfinn
Date:
Tue Feb 07 16:18:57 2017 +0000
Revision:
27:2f486c766854
Parent:
20:ee34856ae510 
changed SDFileSystem library

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ampembeng 20:ee34856ae510 1
ampembeng 20:ee34856ae510 2 #include "HTS221.h"
ampembeng 20:ee34856ae510 3
ampembeng 20:ee34856ae510 4
ampembeng 20:ee34856ae510 5 // ------------------------------------------------------------------------------
ampembeng 20:ee34856ae510 6 //jmf -- define I2C pins and functions to read & write to I2C device
ampembeng 20:ee34856ae510 7
ampembeng 20:ee34856ae510 8 #include <string>
ampembeng 20:ee34856ae510 9 #include "mbed.h"
ampembeng 20:ee34856ae510 10
ampembeng 20:ee34856ae510 11 #include "hardware.h"
ampembeng 20:ee34856ae510 12 //I2C i2c(PTC11, PTC10); //SDA, SCL -- define the I2C pins being used. Defined in a
ampembeng 20:ee34856ae510 13 //common locatioin since sensors also use I2C
ampembeng 20:ee34856ae510 14
ampembeng 20:ee34856ae510 15 // Read a single unsigned char from addressToRead and return it as a unsigned char
ampembeng 20:ee34856ae510 16 unsigned char HTS221::readRegister(unsigned char slaveAddress, unsigned char ToRead)
ampembeng 20:ee34856ae510 17 {
ampembeng 20:ee34856ae510 18 char data = ToRead;
ampembeng 20:ee34856ae510 19
ampembeng 20:ee34856ae510 20 i2c.write(slaveAddress, &data, 1, 1);
ampembeng 20:ee34856ae510 21 i2c.read(slaveAddress, &data, 1, 0);
ampembeng 20:ee34856ae510 22 return data;
ampembeng 20:ee34856ae510 23 }
ampembeng 20:ee34856ae510 24
ampembeng 20:ee34856ae510 25 // Writes a single unsigned char (dataToWrite) into regToWrite
ampembeng 20:ee34856ae510 26 int HTS221::writeRegister(unsigned char slaveAddress, unsigned char regToWrite, unsigned char dataToWrite)
ampembeng 20:ee34856ae510 27 {
ampembeng 20:ee34856ae510 28 const char data[] = {regToWrite, dataToWrite};
ampembeng 20:ee34856ae510 29
ampembeng 20:ee34856ae510 30 return i2c.write(slaveAddress,data,2,0);
ampembeng 20:ee34856ae510 31 }
ampembeng 20:ee34856ae510 32
ampembeng 20:ee34856ae510 33
ampembeng 20:ee34856ae510 34 //jmf end
ampembeng 20:ee34856ae510 35 // ------------------------------------------------------------------------------
ampembeng 20:ee34856ae510 36
ampembeng 20:ee34856ae510 37 //static inline int humidityReady(uint8_t data) {
ampembeng 20:ee34856ae510 38 // return (data & 0x02);
ampembeng 20:ee34856ae510 39 //}
ampembeng 20:ee34856ae510 40 //static inline int temperatureReady(uint8_t data) {
ampembeng 20:ee34856ae510 41 // return (data & 0x01);
ampembeng 20:ee34856ae510 42 //}
ampembeng 20:ee34856ae510 43
ampembeng 20:ee34856ae510 44
ampembeng 20:ee34856ae510 45 HTS221::HTS221(void) : _address(HTS221_ADDRESS)
ampembeng 20:ee34856ae510 46 {
ampembeng 20:ee34856ae510 47 _temperature = 0;
ampembeng 20:ee34856ae510 48 _humidity = 0;
ampembeng 20:ee34856ae510 49 }
ampembeng 20:ee34856ae510 50
ampembeng 20:ee34856ae510 51
ampembeng 20:ee34856ae510 52 int HTS221::begin(void)
ampembeng 20:ee34856ae510 53 {
ampembeng 20:ee34856ae510 54 uint8_t data;
ampembeng 20:ee34856ae510 55
ampembeng 20:ee34856ae510 56 data = readRegister(_address, WHO_AM_I);
ampembeng 20:ee34856ae510 57 if (data == WHO_AM_I_RETURN){
ampembeng 20:ee34856ae510 58 if (activate()){
ampembeng 20:ee34856ae510 59 storeCalibration();
ampembeng 20:ee34856ae510 60 return data;
ampembeng 20:ee34856ae510 61 }
ampembeng 20:ee34856ae510 62 }
ampembeng 20:ee34856ae510 63
ampembeng 20:ee34856ae510 64 return 0;
ampembeng 20:ee34856ae510 65 }
ampembeng 20:ee34856ae510 66
ampembeng 20:ee34856ae510 67 int
ampembeng 20:ee34856ae510 68 HTS221::storeCalibration(void)
ampembeng 20:ee34856ae510 69 {
ampembeng 20:ee34856ae510 70 uint8_t data;
ampembeng 20:ee34856ae510 71 uint16_t tmp;
ampembeng 20:ee34856ae510 72
ampembeng 20:ee34856ae510 73 for (int reg=CALIB_START; reg<=CALIB_END; reg++) {
ampembeng 20:ee34856ae510 74 if ((reg!=CALIB_START+8) && (reg!=CALIB_START+9) && (reg!=CALIB_START+4)) {
ampembeng 20:ee34856ae510 75
ampembeng 20:ee34856ae510 76 data = readRegister(HTS221_ADDRESS, reg);
ampembeng 20:ee34856ae510 77
ampembeng 20:ee34856ae510 78 switch (reg) {
ampembeng 20:ee34856ae510 79 case CALIB_START:
ampembeng 20:ee34856ae510 80 _h0_rH = data;
ampembeng 20:ee34856ae510 81 break;
ampembeng 20:ee34856ae510 82 case CALIB_START+1:
ampembeng 20:ee34856ae510 83 _h1_rH = data;
ampembeng 20:ee34856ae510 84 break;
ampembeng 20:ee34856ae510 85 case CALIB_START+2:
ampembeng 20:ee34856ae510 86 _T0_degC = data;
ampembeng 20:ee34856ae510 87 break;
ampembeng 20:ee34856ae510 88 case CALIB_START+3:
ampembeng 20:ee34856ae510 89 _T1_degC = data;
ampembeng 20:ee34856ae510 90 break;
ampembeng 20:ee34856ae510 91
ampembeng 20:ee34856ae510 92 case CALIB_START+5:
ampembeng 20:ee34856ae510 93 tmp = _T0_degC;
ampembeng 20:ee34856ae510 94 _T0_degC = (data&0x3)<<8;
ampembeng 20:ee34856ae510 95 _T0_degC |= tmp;
ampembeng 20:ee34856ae510 96
ampembeng 20:ee34856ae510 97 tmp = _T1_degC;
ampembeng 20:ee34856ae510 98 _T1_degC = ((data&0xC)>>2)<<8;
ampembeng 20:ee34856ae510 99 _T1_degC |= tmp;
ampembeng 20:ee34856ae510 100 break;
ampembeng 20:ee34856ae510 101 case CALIB_START+6:
ampembeng 20:ee34856ae510 102 _H0_T0 = data;
ampembeng 20:ee34856ae510 103 break;
ampembeng 20:ee34856ae510 104 case CALIB_START+7:
ampembeng 20:ee34856ae510 105 _H0_T0 |= data<<8;
ampembeng 20:ee34856ae510 106 break;
ampembeng 20:ee34856ae510 107 case CALIB_START+0xA:
ampembeng 20:ee34856ae510 108 _H1_T0 = data;
ampembeng 20:ee34856ae510 109 break;
ampembeng 20:ee34856ae510 110 case CALIB_START+0xB:
ampembeng 20:ee34856ae510 111 _H1_T0 |= data <<8;
ampembeng 20:ee34856ae510 112 break;
ampembeng 20:ee34856ae510 113 case CALIB_START+0xC:
ampembeng 20:ee34856ae510 114 _T0_OUT = data;
ampembeng 20:ee34856ae510 115 break;
ampembeng 20:ee34856ae510 116 case CALIB_START+0xD:
ampembeng 20:ee34856ae510 117 _T0_OUT |= data << 8;
ampembeng 20:ee34856ae510 118 break;
ampembeng 20:ee34856ae510 119 case CALIB_START+0xE:
ampembeng 20:ee34856ae510 120 _T1_OUT = data;
ampembeng 20:ee34856ae510 121 break;
ampembeng 20:ee34856ae510 122 case CALIB_START+0xF:
ampembeng 20:ee34856ae510 123 _T1_OUT |= data << 8;
ampembeng 20:ee34856ae510 124 break;
ampembeng 20:ee34856ae510 125
ampembeng 20:ee34856ae510 126
ampembeng 20:ee34856ae510 127 case CALIB_START+8:
ampembeng 20:ee34856ae510 128 case CALIB_START+9:
ampembeng 20:ee34856ae510 129 case CALIB_START+4:
ampembeng 20:ee34856ae510 130 //DO NOTHING
ampembeng 20:ee34856ae510 131 break;
ampembeng 20:ee34856ae510 132
ampembeng 20:ee34856ae510 133 // to cover any possible error
ampembeng 20:ee34856ae510 134 default:
ampembeng 20:ee34856ae510 135 return false;
ampembeng 20:ee34856ae510 136 } /* switch */
ampembeng 20:ee34856ae510 137 } /* if */
ampembeng 20:ee34856ae510 138 } /* for */
ampembeng 20:ee34856ae510 139 return true;
ampembeng 20:ee34856ae510 140 }
ampembeng 20:ee34856ae510 141
ampembeng 20:ee34856ae510 142
ampembeng 20:ee34856ae510 143 int
ampembeng 20:ee34856ae510 144 HTS221::activate(void)
ampembeng 20:ee34856ae510 145 {
ampembeng 20:ee34856ae510 146 uint8_t data;
ampembeng 20:ee34856ae510 147
ampembeng 20:ee34856ae510 148 data = readRegister(_address, CTRL_REG1);
ampembeng 20:ee34856ae510 149 data |= POWER_UP;
ampembeng 20:ee34856ae510 150 data |= ODR0_SET;
ampembeng 20:ee34856ae510 151 writeRegister(_address, CTRL_REG1, data);
ampembeng 20:ee34856ae510 152
ampembeng 20:ee34856ae510 153 return true;
ampembeng 20:ee34856ae510 154 }
ampembeng 20:ee34856ae510 155
ampembeng 20:ee34856ae510 156
ampembeng 20:ee34856ae510 157 int HTS221::deactivate(void)
ampembeng 20:ee34856ae510 158 {
ampembeng 20:ee34856ae510 159 uint8_t data;
ampembeng 20:ee34856ae510 160
ampembeng 20:ee34856ae510 161 data = readRegister(_address, CTRL_REG1);
ampembeng 20:ee34856ae510 162 data &= ~POWER_UP;
ampembeng 20:ee34856ae510 163 writeRegister(_address, CTRL_REG1, data);
ampembeng 20:ee34856ae510 164 return true;
ampembeng 20:ee34856ae510 165 }
ampembeng 20:ee34856ae510 166
ampembeng 20:ee34856ae510 167
ampembeng 20:ee34856ae510 168 int
ampembeng 20:ee34856ae510 169 HTS221::bduActivate(void)
ampembeng 20:ee34856ae510 170 {
ampembeng 20:ee34856ae510 171 uint8_t data;
ampembeng 20:ee34856ae510 172
ampembeng 20:ee34856ae510 173 data = readRegister(_address, CTRL_REG1);
ampembeng 20:ee34856ae510 174 data |= BDU_SET;
ampembeng 20:ee34856ae510 175 writeRegister(_address, CTRL_REG1, data);
ampembeng 20:ee34856ae510 176
ampembeng 20:ee34856ae510 177 return true;
ampembeng 20:ee34856ae510 178 }
ampembeng 20:ee34856ae510 179
ampembeng 20:ee34856ae510 180
ampembeng 20:ee34856ae510 181 int
ampembeng 20:ee34856ae510 182 HTS221::bduDeactivate(void)
ampembeng 20:ee34856ae510 183 {
ampembeng 20:ee34856ae510 184 uint8_t data;
ampembeng 20:ee34856ae510 185
ampembeng 20:ee34856ae510 186 data = readRegister(_address, CTRL_REG1);
ampembeng 20:ee34856ae510 187 data &= ~BDU_SET;
ampembeng 20:ee34856ae510 188 writeRegister(_address, CTRL_REG1, data);
ampembeng 20:ee34856ae510 189 return true;
ampembeng 20:ee34856ae510 190 }
ampembeng 20:ee34856ae510 191
ampembeng 20:ee34856ae510 192
ampembeng 20:ee34856ae510 193 int
ampembeng 20:ee34856ae510 194 HTS221::readHumidity(void)
ampembeng 20:ee34856ae510 195 {
ampembeng 20:ee34856ae510 196 uint8_t data = 0;
ampembeng 20:ee34856ae510 197 uint16_t h_out = 0;
ampembeng 20:ee34856ae510 198 double h_temp = 0.0;
ampembeng 20:ee34856ae510 199 double hum = 0.0;
ampembeng 20:ee34856ae510 200
ampembeng 20:ee34856ae510 201 data = readRegister(_address, STATUS_REG);
ampembeng 20:ee34856ae510 202
ampembeng 20:ee34856ae510 203 if (data & HUMIDITY_READY) {
ampembeng 20:ee34856ae510 204 data = readRegister(_address, HUMIDITY_H_REG);
ampembeng 20:ee34856ae510 205 h_out = data << 8; // MSB
ampembeng 20:ee34856ae510 206 data = readRegister(_address, HUMIDITY_L_REG);
ampembeng 20:ee34856ae510 207 h_out |= data; // LSB
ampembeng 20:ee34856ae510 208
ampembeng 20:ee34856ae510 209 // Decode Humidity
ampembeng 20:ee34856ae510 210 hum = ((int16_t)(_h1_rH) - (int16_t)(_h0_rH))/2.0; // remove x2 multiple
ampembeng 20:ee34856ae510 211
ampembeng 20:ee34856ae510 212 // Calculate humidity in decimal of grade centigrades i.e. 15.0 = 150.
ampembeng 20:ee34856ae510 213 h_temp = (((int16_t)h_out - (int16_t)_H0_T0) * hum) / ((int16_t)_H1_T0 - (int16_t)_H0_T0);
ampembeng 20:ee34856ae510 214 hum = ((int16_t)_h0_rH) / 2.0; // remove x2 multiple
ampembeng 20:ee34856ae510 215 _humidity = (int16_t)((hum + h_temp)); // provide signed % measurement unit
ampembeng 20:ee34856ae510 216 }
ampembeng 20:ee34856ae510 217 return _humidity;
ampembeng 20:ee34856ae510 218 }
ampembeng 20:ee34856ae510 219
ampembeng 20:ee34856ae510 220
ampembeng 20:ee34856ae510 221
ampembeng 20:ee34856ae510 222 double
ampembeng 20:ee34856ae510 223 HTS221::readTemperature(void)
ampembeng 20:ee34856ae510 224 {
ampembeng 20:ee34856ae510 225 uint8_t data = 0;
ampembeng 20:ee34856ae510 226 uint16_t t_out = 0;
ampembeng 20:ee34856ae510 227 double t_temp = 0.0;
ampembeng 20:ee34856ae510 228 double deg = 0.0;
ampembeng 20:ee34856ae510 229
ampembeng 20:ee34856ae510 230 data = readRegister(_address, STATUS_REG);
ampembeng 20:ee34856ae510 231
ampembeng 20:ee34856ae510 232 if (data & TEMPERATURE_READY) {
ampembeng 20:ee34856ae510 233
ampembeng 20:ee34856ae510 234 data= readRegister(_address, TEMP_H_REG);
ampembeng 20:ee34856ae510 235 t_out = data << 8; // MSB
ampembeng 20:ee34856ae510 236 data = readRegister(_address, TEMP_L_REG);
ampembeng 20:ee34856ae510 237 t_out |= data; // LSB
ampembeng 20:ee34856ae510 238
ampembeng 20:ee34856ae510 239 // Decode Temperature
ampembeng 20:ee34856ae510 240 deg = ((int16_t)(_T1_degC) - (int16_t)(_T0_degC))/8.0; // remove x8 multiple
ampembeng 20:ee34856ae510 241
ampembeng 20:ee34856ae510 242 // Calculate Temperature in decimal of grade centigrades i.e. 15.0 = 150.
ampembeng 20:ee34856ae510 243 t_temp = (((int16_t)t_out - (int16_t)_T0_OUT) * deg) / ((int16_t)_T1_OUT - (int16_t)_T0_OUT);
ampembeng 20:ee34856ae510 244 deg = ((int16_t)_T0_degC) / 8.0; // remove x8 multiple
ampembeng 20:ee34856ae510 245 _temperature = deg + t_temp; // provide signed celsius measurement unit
ampembeng 20:ee34856ae510 246 }
ampembeng 20:ee34856ae510 247
ampembeng 20:ee34856ae510 248 return _temperature;
ampembeng 20:ee34856ae510 249 }
ampembeng 20:ee34856ae510 250