publish final code
Dependencies: FXOS8700CQ Pubnub_mbed2_sync2 SoftSerial TinyGPSplus WNCInterface2 mbed-rtos mbed
hts221_driver.cpp@0:1092494506a3, 2017-02-21 (annotated)
- Committer:
- cswiger
- Date:
- Tue Feb 21 22:28:26 2017 +0000
- Revision:
- 0:1092494506a3
publish final code
Who changed what in which revision?
User | Revision | Line number | New contents of line |
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cswiger | 0:1092494506a3 | 1 | /* =================================================================== |
cswiger | 0:1092494506a3 | 2 | Copyright © 2016, AVNET Inc. |
cswiger | 0:1092494506a3 | 3 | |
cswiger | 0:1092494506a3 | 4 | Licensed under the Apache License, Version 2.0 (the "License"); |
cswiger | 0:1092494506a3 | 5 | you may not use this file except in compliance with the License. |
cswiger | 0:1092494506a3 | 6 | You may obtain a copy of the License at |
cswiger | 0:1092494506a3 | 7 | |
cswiger | 0:1092494506a3 | 8 | http://www.apache.org/licenses/LICENSE-2.0 |
cswiger | 0:1092494506a3 | 9 | |
cswiger | 0:1092494506a3 | 10 | Unless required by applicable law or agreed to in writing, |
cswiger | 0:1092494506a3 | 11 | software distributed under the License is distributed on an |
cswiger | 0:1092494506a3 | 12 | "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, |
cswiger | 0:1092494506a3 | 13 | either express or implied. See the License for the specific |
cswiger | 0:1092494506a3 | 14 | language governing permissions and limitations under the License. |
cswiger | 0:1092494506a3 | 15 | |
cswiger | 0:1092494506a3 | 16 | ======================================================================== */ |
cswiger | 0:1092494506a3 | 17 | |
cswiger | 0:1092494506a3 | 18 | #include "HTS221.h" |
cswiger | 0:1092494506a3 | 19 | |
cswiger | 0:1092494506a3 | 20 | |
cswiger | 0:1092494506a3 | 21 | // ------------------------------------------------------------------------------ |
cswiger | 0:1092494506a3 | 22 | //jmf -- define I2C pins and functions to read & write to I2C device |
cswiger | 0:1092494506a3 | 23 | |
cswiger | 0:1092494506a3 | 24 | #include <string> |
cswiger | 0:1092494506a3 | 25 | #include "mbed.h" |
cswiger | 0:1092494506a3 | 26 | |
cswiger | 0:1092494506a3 | 27 | #include "hardware.h" |
cswiger | 0:1092494506a3 | 28 | //I2C i2c(PTC11, PTC10); //SDA, SCL -- define the I2C pins being used. Defined in a |
cswiger | 0:1092494506a3 | 29 | //common locatioin since sensors also use I2C |
cswiger | 0:1092494506a3 | 30 | |
cswiger | 0:1092494506a3 | 31 | // Read a single unsigned char from addressToRead and return it as a unsigned char |
cswiger | 0:1092494506a3 | 32 | unsigned char HTS221::readRegister(unsigned char slaveAddress, unsigned char ToRead) |
cswiger | 0:1092494506a3 | 33 | { |
cswiger | 0:1092494506a3 | 34 | char data = ToRead; |
cswiger | 0:1092494506a3 | 35 | |
cswiger | 0:1092494506a3 | 36 | //i2c.write(slaveAddress, &data, 1, 0); |
cswiger | 0:1092494506a3 | 37 | i2c.write(slaveAddress, &data, 1, 1); //by Stefan |
cswiger | 0:1092494506a3 | 38 | i2c.read(slaveAddress, &data, 1, 0); |
cswiger | 0:1092494506a3 | 39 | return data; |
cswiger | 0:1092494506a3 | 40 | } |
cswiger | 0:1092494506a3 | 41 | |
cswiger | 0:1092494506a3 | 42 | // Writes a single unsigned char (dataToWrite) into regToWrite |
cswiger | 0:1092494506a3 | 43 | int HTS221::writeRegister(unsigned char slaveAddress, unsigned char regToWrite, unsigned char dataToWrite) |
cswiger | 0:1092494506a3 | 44 | { |
cswiger | 0:1092494506a3 | 45 | const char data[] = {regToWrite, dataToWrite}; |
cswiger | 0:1092494506a3 | 46 | |
cswiger | 0:1092494506a3 | 47 | return i2c.write(slaveAddress,data,2,0); |
cswiger | 0:1092494506a3 | 48 | } |
cswiger | 0:1092494506a3 | 49 | |
cswiger | 0:1092494506a3 | 50 | |
cswiger | 0:1092494506a3 | 51 | //jmf end |
cswiger | 0:1092494506a3 | 52 | // ------------------------------------------------------------------------------ |
cswiger | 0:1092494506a3 | 53 | |
cswiger | 0:1092494506a3 | 54 | //static inline int humidityReady(uint8_t data) { |
cswiger | 0:1092494506a3 | 55 | // return (data & 0x02); |
cswiger | 0:1092494506a3 | 56 | //} |
cswiger | 0:1092494506a3 | 57 | //static inline int temperatureReady(uint8_t data) { |
cswiger | 0:1092494506a3 | 58 | // return (data & 0x01); |
cswiger | 0:1092494506a3 | 59 | //} |
cswiger | 0:1092494506a3 | 60 | |
cswiger | 0:1092494506a3 | 61 | |
cswiger | 0:1092494506a3 | 62 | HTS221::HTS221(void) : _address(HTS221_ADDRESS) |
cswiger | 0:1092494506a3 | 63 | { |
cswiger | 0:1092494506a3 | 64 | _temperature = 0; |
cswiger | 0:1092494506a3 | 65 | _humidity = 0; |
cswiger | 0:1092494506a3 | 66 | } |
cswiger | 0:1092494506a3 | 67 | |
cswiger | 0:1092494506a3 | 68 | |
cswiger | 0:1092494506a3 | 69 | int HTS221::begin(void) |
cswiger | 0:1092494506a3 | 70 | { |
cswiger | 0:1092494506a3 | 71 | uint8_t data; |
cswiger | 0:1092494506a3 | 72 | |
cswiger | 0:1092494506a3 | 73 | data = readRegister(_address, WHO_AM_I); |
cswiger | 0:1092494506a3 | 74 | if (data == WHO_AM_I_RETURN){ |
cswiger | 0:1092494506a3 | 75 | if (activate()){ |
cswiger | 0:1092494506a3 | 76 | storeCalibration(); |
cswiger | 0:1092494506a3 | 77 | return data; |
cswiger | 0:1092494506a3 | 78 | } |
cswiger | 0:1092494506a3 | 79 | } |
cswiger | 0:1092494506a3 | 80 | |
cswiger | 0:1092494506a3 | 81 | return 0; |
cswiger | 0:1092494506a3 | 82 | } |
cswiger | 0:1092494506a3 | 83 | |
cswiger | 0:1092494506a3 | 84 | int |
cswiger | 0:1092494506a3 | 85 | HTS221::storeCalibration(void) |
cswiger | 0:1092494506a3 | 86 | { |
cswiger | 0:1092494506a3 | 87 | uint8_t data; |
cswiger | 0:1092494506a3 | 88 | uint16_t tmp; |
cswiger | 0:1092494506a3 | 89 | |
cswiger | 0:1092494506a3 | 90 | for (int reg=CALIB_START; reg<=CALIB_END; reg++) { |
cswiger | 0:1092494506a3 | 91 | if ((reg!=CALIB_START+8) && (reg!=CALIB_START+9) && (reg!=CALIB_START+4)) { |
cswiger | 0:1092494506a3 | 92 | |
cswiger | 0:1092494506a3 | 93 | data = readRegister(HTS221_ADDRESS, reg); |
cswiger | 0:1092494506a3 | 94 | |
cswiger | 0:1092494506a3 | 95 | switch (reg) { |
cswiger | 0:1092494506a3 | 96 | case CALIB_START: |
cswiger | 0:1092494506a3 | 97 | _h0_rH = data; |
cswiger | 0:1092494506a3 | 98 | break; |
cswiger | 0:1092494506a3 | 99 | case CALIB_START+1: |
cswiger | 0:1092494506a3 | 100 | _h1_rH = data; |
cswiger | 0:1092494506a3 | 101 | break; |
cswiger | 0:1092494506a3 | 102 | case CALIB_START+2: |
cswiger | 0:1092494506a3 | 103 | _T0_degC = data; |
cswiger | 0:1092494506a3 | 104 | break; |
cswiger | 0:1092494506a3 | 105 | case CALIB_START+3: |
cswiger | 0:1092494506a3 | 106 | _T1_degC = data; |
cswiger | 0:1092494506a3 | 107 | break; |
cswiger | 0:1092494506a3 | 108 | |
cswiger | 0:1092494506a3 | 109 | case CALIB_START+5: |
cswiger | 0:1092494506a3 | 110 | tmp = _T0_degC; |
cswiger | 0:1092494506a3 | 111 | _T0_degC = (data&0x3)<<8; |
cswiger | 0:1092494506a3 | 112 | _T0_degC |= tmp; |
cswiger | 0:1092494506a3 | 113 | |
cswiger | 0:1092494506a3 | 114 | tmp = _T1_degC; |
cswiger | 0:1092494506a3 | 115 | _T1_degC = ((data&0xC)>>2)<<8; |
cswiger | 0:1092494506a3 | 116 | _T1_degC |= tmp; |
cswiger | 0:1092494506a3 | 117 | break; |
cswiger | 0:1092494506a3 | 118 | case CALIB_START+6: |
cswiger | 0:1092494506a3 | 119 | _H0_T0 = data; |
cswiger | 0:1092494506a3 | 120 | break; |
cswiger | 0:1092494506a3 | 121 | case CALIB_START+7: |
cswiger | 0:1092494506a3 | 122 | _H0_T0 |= data<<8; |
cswiger | 0:1092494506a3 | 123 | break; |
cswiger | 0:1092494506a3 | 124 | case CALIB_START+0xA: |
cswiger | 0:1092494506a3 | 125 | _H1_T0 = data; |
cswiger | 0:1092494506a3 | 126 | break; |
cswiger | 0:1092494506a3 | 127 | case CALIB_START+0xB: |
cswiger | 0:1092494506a3 | 128 | _H1_T0 |= data <<8; |
cswiger | 0:1092494506a3 | 129 | break; |
cswiger | 0:1092494506a3 | 130 | case CALIB_START+0xC: |
cswiger | 0:1092494506a3 | 131 | _T0_OUT = data; |
cswiger | 0:1092494506a3 | 132 | break; |
cswiger | 0:1092494506a3 | 133 | case CALIB_START+0xD: |
cswiger | 0:1092494506a3 | 134 | _T0_OUT |= data << 8; |
cswiger | 0:1092494506a3 | 135 | break; |
cswiger | 0:1092494506a3 | 136 | case CALIB_START+0xE: |
cswiger | 0:1092494506a3 | 137 | _T1_OUT = data; |
cswiger | 0:1092494506a3 | 138 | break; |
cswiger | 0:1092494506a3 | 139 | case CALIB_START+0xF: |
cswiger | 0:1092494506a3 | 140 | _T1_OUT |= data << 8; |
cswiger | 0:1092494506a3 | 141 | break; |
cswiger | 0:1092494506a3 | 142 | |
cswiger | 0:1092494506a3 | 143 | |
cswiger | 0:1092494506a3 | 144 | case CALIB_START+8: |
cswiger | 0:1092494506a3 | 145 | case CALIB_START+9: |
cswiger | 0:1092494506a3 | 146 | case CALIB_START+4: |
cswiger | 0:1092494506a3 | 147 | //DO NOTHING |
cswiger | 0:1092494506a3 | 148 | break; |
cswiger | 0:1092494506a3 | 149 | |
cswiger | 0:1092494506a3 | 150 | // to cover any possible error |
cswiger | 0:1092494506a3 | 151 | default: |
cswiger | 0:1092494506a3 | 152 | return false; |
cswiger | 0:1092494506a3 | 153 | } /* switch */ |
cswiger | 0:1092494506a3 | 154 | } /* if */ |
cswiger | 0:1092494506a3 | 155 | } /* for */ |
cswiger | 0:1092494506a3 | 156 | return true; |
cswiger | 0:1092494506a3 | 157 | } |
cswiger | 0:1092494506a3 | 158 | |
cswiger | 0:1092494506a3 | 159 | |
cswiger | 0:1092494506a3 | 160 | int |
cswiger | 0:1092494506a3 | 161 | HTS221::activate(void) |
cswiger | 0:1092494506a3 | 162 | { |
cswiger | 0:1092494506a3 | 163 | uint8_t data; |
cswiger | 0:1092494506a3 | 164 | |
cswiger | 0:1092494506a3 | 165 | data = readRegister(_address, CTRL_REG1); |
cswiger | 0:1092494506a3 | 166 | data |= POWER_UP; |
cswiger | 0:1092494506a3 | 167 | data |= ODR0_SET; |
cswiger | 0:1092494506a3 | 168 | writeRegister(_address, CTRL_REG1, data); |
cswiger | 0:1092494506a3 | 169 | |
cswiger | 0:1092494506a3 | 170 | return true; |
cswiger | 0:1092494506a3 | 171 | } |
cswiger | 0:1092494506a3 | 172 | |
cswiger | 0:1092494506a3 | 173 | |
cswiger | 0:1092494506a3 | 174 | int HTS221::deactivate(void) |
cswiger | 0:1092494506a3 | 175 | { |
cswiger | 0:1092494506a3 | 176 | uint8_t data; |
cswiger | 0:1092494506a3 | 177 | |
cswiger | 0:1092494506a3 | 178 | data = readRegister(_address, CTRL_REG1); |
cswiger | 0:1092494506a3 | 179 | data &= ~POWER_UP; |
cswiger | 0:1092494506a3 | 180 | writeRegister(_address, CTRL_REG1, data); |
cswiger | 0:1092494506a3 | 181 | return true; |
cswiger | 0:1092494506a3 | 182 | } |
cswiger | 0:1092494506a3 | 183 | |
cswiger | 0:1092494506a3 | 184 | |
cswiger | 0:1092494506a3 | 185 | int |
cswiger | 0:1092494506a3 | 186 | HTS221::bduActivate(void) |
cswiger | 0:1092494506a3 | 187 | { |
cswiger | 0:1092494506a3 | 188 | uint8_t data; |
cswiger | 0:1092494506a3 | 189 | |
cswiger | 0:1092494506a3 | 190 | data = readRegister(_address, CTRL_REG1); |
cswiger | 0:1092494506a3 | 191 | data |= BDU_SET; |
cswiger | 0:1092494506a3 | 192 | writeRegister(_address, CTRL_REG1, data); |
cswiger | 0:1092494506a3 | 193 | |
cswiger | 0:1092494506a3 | 194 | return true; |
cswiger | 0:1092494506a3 | 195 | } |
cswiger | 0:1092494506a3 | 196 | |
cswiger | 0:1092494506a3 | 197 | |
cswiger | 0:1092494506a3 | 198 | int |
cswiger | 0:1092494506a3 | 199 | HTS221::bduDeactivate(void) |
cswiger | 0:1092494506a3 | 200 | { |
cswiger | 0:1092494506a3 | 201 | uint8_t data; |
cswiger | 0:1092494506a3 | 202 | |
cswiger | 0:1092494506a3 | 203 | data = readRegister(_address, CTRL_REG1); |
cswiger | 0:1092494506a3 | 204 | data &= ~BDU_SET; |
cswiger | 0:1092494506a3 | 205 | writeRegister(_address, CTRL_REG1, data); |
cswiger | 0:1092494506a3 | 206 | return true; |
cswiger | 0:1092494506a3 | 207 | } |
cswiger | 0:1092494506a3 | 208 | |
cswiger | 0:1092494506a3 | 209 | |
cswiger | 0:1092494506a3 | 210 | int |
cswiger | 0:1092494506a3 | 211 | HTS221::readHumidity(void) |
cswiger | 0:1092494506a3 | 212 | { |
cswiger | 0:1092494506a3 | 213 | uint8_t data = 0; |
cswiger | 0:1092494506a3 | 214 | uint16_t h_out = 0; |
cswiger | 0:1092494506a3 | 215 | double h_temp = 0.0; |
cswiger | 0:1092494506a3 | 216 | double hum = 0.0; |
cswiger | 0:1092494506a3 | 217 | |
cswiger | 0:1092494506a3 | 218 | data = readRegister(_address, STATUS_REG); |
cswiger | 0:1092494506a3 | 219 | |
cswiger | 0:1092494506a3 | 220 | if (data & HUMIDITY_READY) { |
cswiger | 0:1092494506a3 | 221 | data = readRegister(_address, HUMIDITY_H_REG); |
cswiger | 0:1092494506a3 | 222 | h_out = data << 8; // MSB |
cswiger | 0:1092494506a3 | 223 | data = readRegister(_address, HUMIDITY_L_REG); |
cswiger | 0:1092494506a3 | 224 | h_out |= data; // LSB |
cswiger | 0:1092494506a3 | 225 | |
cswiger | 0:1092494506a3 | 226 | // Decode Humidity |
cswiger | 0:1092494506a3 | 227 | hum = ((int16_t)(_h1_rH) - (int16_t)(_h0_rH))/2.0; // remove x2 multiple |
cswiger | 0:1092494506a3 | 228 | |
cswiger | 0:1092494506a3 | 229 | // Calculate humidity in decimal of grade centigrades i.e. 15.0 = 150. |
cswiger | 0:1092494506a3 | 230 | h_temp = (((int16_t)h_out - (int16_t)_H0_T0) * hum) / ((int16_t)_H1_T0 - (int16_t)_H0_T0); |
cswiger | 0:1092494506a3 | 231 | hum = ((int16_t)_h0_rH) / 2.0; // remove x2 multiple |
cswiger | 0:1092494506a3 | 232 | _humidity = (int16_t)((hum + h_temp)); // provide signed % measurement unit |
cswiger | 0:1092494506a3 | 233 | } |
cswiger | 0:1092494506a3 | 234 | return _humidity; |
cswiger | 0:1092494506a3 | 235 | } |
cswiger | 0:1092494506a3 | 236 | |
cswiger | 0:1092494506a3 | 237 | |
cswiger | 0:1092494506a3 | 238 | |
cswiger | 0:1092494506a3 | 239 | double |
cswiger | 0:1092494506a3 | 240 | HTS221::readTemperature(void) |
cswiger | 0:1092494506a3 | 241 | { |
cswiger | 0:1092494506a3 | 242 | uint8_t data = 0; |
cswiger | 0:1092494506a3 | 243 | uint16_t t_out = 0; |
cswiger | 0:1092494506a3 | 244 | double t_temp = 0.0; |
cswiger | 0:1092494506a3 | 245 | double deg = 0.0; |
cswiger | 0:1092494506a3 | 246 | |
cswiger | 0:1092494506a3 | 247 | data = readRegister(_address, STATUS_REG); |
cswiger | 0:1092494506a3 | 248 | |
cswiger | 0:1092494506a3 | 249 | if (data & TEMPERATURE_READY) { |
cswiger | 0:1092494506a3 | 250 | |
cswiger | 0:1092494506a3 | 251 | data= readRegister(_address, TEMP_H_REG); |
cswiger | 0:1092494506a3 | 252 | t_out = data << 8; // MSB |
cswiger | 0:1092494506a3 | 253 | data = readRegister(_address, TEMP_L_REG); |
cswiger | 0:1092494506a3 | 254 | t_out |= data; // LSB |
cswiger | 0:1092494506a3 | 255 | |
cswiger | 0:1092494506a3 | 256 | // Decode Temperature |
cswiger | 0:1092494506a3 | 257 | deg = ((int16_t)(_T1_degC) - (int16_t)(_T0_degC))/8.0; // remove x8 multiple |
cswiger | 0:1092494506a3 | 258 | |
cswiger | 0:1092494506a3 | 259 | // Calculate Temperature in decimal of grade centigrades i.e. 15.0 = 150. |
cswiger | 0:1092494506a3 | 260 | t_temp = (((int16_t)t_out - (int16_t)_T0_OUT) * deg) / ((int16_t)_T1_OUT - (int16_t)_T0_OUT); |
cswiger | 0:1092494506a3 | 261 | deg = ((int16_t)_T0_degC) / 8.0; // remove x8 multiple |
cswiger | 0:1092494506a3 | 262 | _temperature = deg + t_temp; // provide signed celsius measurement unit |
cswiger | 0:1092494506a3 | 263 | } |
cswiger | 0:1092494506a3 | 264 | |
cswiger | 0:1092494506a3 | 265 | return _temperature; |
cswiger | 0:1092494506a3 | 266 | } |