Jurica Resetar / Si7006A20

Library for Silicon Labs Si7006 digital temperature and humidity chip.

Dependents:   acd52832_Humidity_Temp_Example iBeacon acnsensa acnSENSA

Si7006A20.cpp@0:cc2c5d49fe63, 2017-07-10 (annotated)

Committer:
jurica238814
Date:
Mon Jul 10 17:14:44 2017 +0000
Revision:
0:cc2c5d49fe63
Child:
1:155934570c14
Humidity works. Temperature todo (maybe just check).

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jurica238814 0:cc2c5d49fe63 1 /*******************************************************************************
jurica238814 0:cc2c5d49fe63 2 * Copyright (C) 2015 Maxim Integrated Products, Inc., All Rights Reserved.
jurica238814 0:cc2c5d49fe63 3 *
jurica238814 0:cc2c5d49fe63 4 * Permission is hereby granted, free of charge, to any person obtaining a
jurica238814 0:cc2c5d49fe63 5 * copy of this software and associated documentation files (the "Software"),
jurica238814 0:cc2c5d49fe63 6 * to deal in the Software without restriction, including without limitation
jurica238814 0:cc2c5d49fe63 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
jurica238814 0:cc2c5d49fe63 8 * and/or sell copies of the Software, and to permit persons to whom the
jurica238814 0:cc2c5d49fe63 9 * Software is furnished to do so, subject to the following conditions:
jurica238814 0:cc2c5d49fe63 10 *
jurica238814 0:cc2c5d49fe63 11 * The above copyright notice and this permission notice shall be included
jurica238814 0:cc2c5d49fe63 12 * in all copies or substantial portions of the Software.
jurica238814 0:cc2c5d49fe63 13 *
jurica238814 0:cc2c5d49fe63 14 *
jurica238814 0:cc2c5d49fe63 15 * The library is modified to suite Si7006A20 Humidity and Temperature Sesor
jurica238814 0:cc2c5d49fe63 16 * Made by Jurica Resetar @ aconno
jurica238814 0:cc2c5d49fe63 17 * More info and contact: aconno.de
jurica238814 0:cc2c5d49fe63 18 *
jurica238814 0:cc2c5d49fe63 19 *******************************************************************************
jurica238814 0:cc2c5d49fe63 20 */
jurica238814 0:cc2c5d49fe63 21
jurica238814 0:cc2c5d49fe63 22 #include "Si7006A20.h"
jurica238814 0:cc2c5d49fe63 23
jurica238814 0:cc2c5d49fe63 24 /***** Definitions *****/
jurica238814 0:cc2c5d49fe63 25 #define I2C_ADDR (0x80) // 1000000x
jurica238814 0:cc2c5d49fe63 26 #define POLYVAL (0x131)
jurica238814 0:cc2c5d49fe63 27
jurica238814 0:cc2c5d49fe63 28 /***** File Scope Data *****/
jurica238814 0:cc2c5d49fe63 29 static const char cmd_meas_humid[] = { 0xE5 };
jurica238814 0:cc2c5d49fe63 30 static const char cmd_meas_humid_no_hold[] = { 0xF5 };
jurica238814 0:cc2c5d49fe63 31 static const char cmd_meas_temp[] = { 0xE3 };
jurica238814 0:cc2c5d49fe63 32 static const char cmd_meas_temp_no_hold[] = { 0xF3 };
jurica238814 0:cc2c5d49fe63 33 static const char cmd_meas_prev_temp[] = { 0xE0 };
jurica238814 0:cc2c5d49fe63 34 static const char cmd_rst[] = { 0xFE };
jurica238814 0:cc2c5d49fe63 35 static const char cmd_write_user1[] = { 0xE6 };
jurica238814 0:cc2c5d49fe63 36 static const char cmd_read_user1[] = { 0xE7 };
jurica238814 0:cc2c5d49fe63 37 static const char cmd_id_1[] = { 0xFA, 0x0F };
jurica238814 0:cc2c5d49fe63 38 static const char cmd_id_2[] = { 0xFC, 0xC9 };
jurica238814 0:cc2c5d49fe63 39 static const char cmd_fw_ver[] = { 0x84, 0xB8 };
jurica238814 0:cc2c5d49fe63 40
jurica238814 0:cc2c5d49fe63 41 //******************************************************************************
jurica238814 0:cc2c5d49fe63 42 Si7006::Si7006(PinName sda, PinName scl){
jurica238814 0:cc2c5d49fe63 43 i2c_ = new I2C(sda, scl);
jurica238814 0:cc2c5d49fe63 44 i2c_owner = true;
jurica238814 0:cc2c5d49fe63 45
jurica238814 0:cc2c5d49fe63 46 // 400KHz, as specified by the datasheet.
jurica238814 0:cc2c5d49fe63 47 i2c_->frequency(400000);
jurica238814 0:cc2c5d49fe63 48 }
jurica238814 0:cc2c5d49fe63 49
jurica238814 0:cc2c5d49fe63 50 //******************************************************************************
jurica238814 0:cc2c5d49fe63 51 Si7006::Si7006(I2C *i2c) : i2c_(i2c){
jurica238814 0:cc2c5d49fe63 52 i2c_owner = false;
jurica238814 0:cc2c5d49fe63 53 }
jurica238814 0:cc2c5d49fe63 54
jurica238814 0:cc2c5d49fe63 55 //******************************************************************************
jurica238814 0:cc2c5d49fe63 56 Si7006::~Si7006(){
jurica238814 0:cc2c5d49fe63 57 if(i2c_owner) {
jurica238814 0:cc2c5d49fe63 58 delete i2c_;
jurica238814 0:cc2c5d49fe63 59 }
jurica238814 0:cc2c5d49fe63 60 }
jurica238814 0:cc2c5d49fe63 61
jurica238814 0:cc2c5d49fe63 62 //******************************************************************************
jurica238814 0:cc2c5d49fe63 63 int Si7006::reset(void){
jurica238814 0:cc2c5d49fe63 64 if (i2c_->write(I2C_ADDR, cmd_rst, sizeof(cmd_rst)) != 0) {
jurica238814 0:cc2c5d49fe63 65 return -1;
jurica238814 0:cc2c5d49fe63 66 }
jurica238814 0:cc2c5d49fe63 67 return 0;
jurica238814 0:cc2c5d49fe63 68 }
jurica238814 0:cc2c5d49fe63 69
jurica238814 0:cc2c5d49fe63 70 //******************************************************************************
jurica238814 0:cc2c5d49fe63 71 int Si7006::getElectronicId(char* id){
jurica238814 0:cc2c5d49fe63 72 // Send cmd with repeated start
jurica238814 0:cc2c5d49fe63 73 if (i2c_->write(I2C_ADDR, cmd_id_1, sizeof(cmd_id_1), true) != 0) {
jurica238814 0:cc2c5d49fe63 74 return -1;
jurica238814 0:cc2c5d49fe63 75 }
jurica238814 0:cc2c5d49fe63 76
jurica238814 0:cc2c5d49fe63 77 // Read first portion of ID
jurica238814 0:cc2c5d49fe63 78 char temp[8];
jurica238814 0:cc2c5d49fe63 79 if (i2c_->read(I2C_ADDR, temp, 8, false) != 0) {
jurica238814 0:cc2c5d49fe63 80 return -1;
jurica238814 0:cc2c5d49fe63 81 }
jurica238814 0:cc2c5d49fe63 82
jurica238814 0:cc2c5d49fe63 83 // Check the CRC
jurica238814 0:cc2c5d49fe63 84 char crc = 0;
jurica238814 0:cc2c5d49fe63 85 int i;
jurica238814 0:cc2c5d49fe63 86 for(i = 0; i < 4; i++) {
jurica238814 0:cc2c5d49fe63 87 crc = crc8(temp[2*i], crc);
jurica238814 0:cc2c5d49fe63 88 if(crc != temp[2*i +1]) {
jurica238814 0:cc2c5d49fe63 89 return -1;
jurica238814 0:cc2c5d49fe63 90 }
jurica238814 0:cc2c5d49fe63 91 }
jurica238814 0:cc2c5d49fe63 92
jurica238814 0:cc2c5d49fe63 93 // Save top portion of ID
jurica238814 0:cc2c5d49fe63 94 id[7] = temp [0];
jurica238814 0:cc2c5d49fe63 95 id[6] = temp [2];
jurica238814 0:cc2c5d49fe63 96 id[5] = temp [4];
jurica238814 0:cc2c5d49fe63 97 id[4] = temp [6];
jurica238814 0:cc2c5d49fe63 98
jurica238814 0:cc2c5d49fe63 99 // Send cmd with repeated start
jurica238814 0:cc2c5d49fe63 100 if (i2c_->write(I2C_ADDR, cmd_id_2, sizeof(cmd_id_2), true) != 0) {
jurica238814 0:cc2c5d49fe63 101 return -1;
jurica238814 0:cc2c5d49fe63 102 }
jurica238814 0:cc2c5d49fe63 103
jurica238814 0:cc2c5d49fe63 104 // Read rest of ID
jurica238814 0:cc2c5d49fe63 105 if (i2c_->read(I2C_ADDR, temp, 6, false) != 0) {
jurica238814 0:cc2c5d49fe63 106 return -1;
jurica238814 0:cc2c5d49fe63 107 }
jurica238814 0:cc2c5d49fe63 108
jurica238814 0:cc2c5d49fe63 109 // Check the CRC
jurica238814 0:cc2c5d49fe63 110 crc = 0;
jurica238814 0:cc2c5d49fe63 111 for(i = 0; i < 2; i++) {
jurica238814 0:cc2c5d49fe63 112 crc = crc8(temp[3*i], crc);
jurica238814 0:cc2c5d49fe63 113 crc = crc8(temp[3*i + 1], crc);
jurica238814 0:cc2c5d49fe63 114 if(crc != temp[3*i + 2]) {
jurica238814 0:cc2c5d49fe63 115 return -1;
jurica238814 0:cc2c5d49fe63 116 }
jurica238814 0:cc2c5d49fe63 117 }
jurica238814 0:cc2c5d49fe63 118
jurica238814 0:cc2c5d49fe63 119 // Save bottom portion of ID
jurica238814 0:cc2c5d49fe63 120 id[3] = temp [0];
jurica238814 0:cc2c5d49fe63 121 id[2] = temp [1];
jurica238814 0:cc2c5d49fe63 122 id[1] = temp [3];
jurica238814 0:cc2c5d49fe63 123 id[0] = temp [4];
jurica238814 0:cc2c5d49fe63 124
jurica238814 0:cc2c5d49fe63 125 return 0;
jurica238814 0:cc2c5d49fe63 126 }
jurica238814 0:cc2c5d49fe63 127
jurica238814 0:cc2c5d49fe63 128 //******************************************************************************
jurica238814 0:cc2c5d49fe63 129 int Si7006::configResolution(Si7006::resolution_t resolution){
jurica238814 0:cc2c5d49fe63 130 char data[2];
jurica238814 0:cc2c5d49fe63 131
jurica238814 0:cc2c5d49fe63 132 if (i2c_->write(I2C_ADDR, cmd_read_user1, sizeof(cmd_read_user1)) != 0) {
jurica238814 0:cc2c5d49fe63 133 return -1;
jurica238814 0:cc2c5d49fe63 134 }
jurica238814 0:cc2c5d49fe63 135
jurica238814 0:cc2c5d49fe63 136 if (i2c_->read(I2C_ADDR, &data[1], 1) != 0) {
jurica238814 0:cc2c5d49fe63 137 return -1;
jurica238814 0:cc2c5d49fe63 138 }
jurica238814 0:cc2c5d49fe63 139
jurica238814 0:cc2c5d49fe63 140 switch (resolution) {
jurica238814 0:cc2c5d49fe63 141 case RH_12b_TEMP_14b:
jurica238814 0:cc2c5d49fe63 142 data[1] &= ~0x81;
jurica238814 0:cc2c5d49fe63 143 break;
jurica238814 0:cc2c5d49fe63 144 case RH_8b_TEMP_12b:
jurica238814 0:cc2c5d49fe63 145 data[1] = (data[1] & ~0x80) | 0x01;
jurica238814 0:cc2c5d49fe63 146 break;
jurica238814 0:cc2c5d49fe63 147 case RH_10b_TEMP_13b:
jurica238814 0:cc2c5d49fe63 148 data[1] = (data[1] & ~0x01) | 0x80;
jurica238814 0:cc2c5d49fe63 149 break;
jurica238814 0:cc2c5d49fe63 150 case RH_11b_TEMP_11b:
jurica238814 0:cc2c5d49fe63 151 data[1] |= 0x81;
jurica238814 0:cc2c5d49fe63 152 break;
jurica238814 0:cc2c5d49fe63 153 default:
jurica238814 0:cc2c5d49fe63 154 return -1;
jurica238814 0:cc2c5d49fe63 155 }
jurica238814 0:cc2c5d49fe63 156
jurica238814 0:cc2c5d49fe63 157 data[0] = cmd_write_user1[0];
jurica238814 0:cc2c5d49fe63 158
jurica238814 0:cc2c5d49fe63 159 if (i2c_->write(I2C_ADDR, data, 2) != 0) {
jurica238814 0:cc2c5d49fe63 160 return -1;
jurica238814 0:cc2c5d49fe63 161 }
jurica238814 0:cc2c5d49fe63 162
jurica238814 0:cc2c5d49fe63 163 return 0;
jurica238814 0:cc2c5d49fe63 164 }
jurica238814 0:cc2c5d49fe63 165
jurica238814 0:cc2c5d49fe63 166 //******************************************************************************
jurica238814 0:cc2c5d49fe63 167 int Si7006::getTemperature(int16_t *tempCx10){
jurica238814 0:cc2c5d49fe63 168 if (i2c_->write(I2C_ADDR, cmd_meas_temp, sizeof(cmd_meas_temp)) != 0) {
jurica238814 0:cc2c5d49fe63 169 return -1;
jurica238814 0:cc2c5d49fe63 170 }
jurica238814 0:cc2c5d49fe63 171
jurica238814 0:cc2c5d49fe63 172 return checkTemperature(tempCx10);
jurica238814 0:cc2c5d49fe63 173 }
jurica238814 0:cc2c5d49fe63 174
jurica238814 0:cc2c5d49fe63 175 //******************************************************************************
jurica238814 0:cc2c5d49fe63 176 int Si7006::getTemperature(float *tempC){
jurica238814 0:cc2c5d49fe63 177 if (i2c_->write(I2C_ADDR, cmd_meas_temp, sizeof(cmd_meas_temp)) != 0) {
jurica238814 0:cc2c5d49fe63 178 return -1;
jurica238814 0:cc2c5d49fe63 179 }
jurica238814 0:cc2c5d49fe63 180
jurica238814 0:cc2c5d49fe63 181 return checkTemperature(tempC);
jurica238814 0:cc2c5d49fe63 182 }
jurica238814 0:cc2c5d49fe63 183
jurica238814 0:cc2c5d49fe63 184 //******************************************************************************
jurica238814 0:cc2c5d49fe63 185 int Si7006::startTemperature(void){
jurica238814 0:cc2c5d49fe63 186 if (i2c_->write(I2C_ADDR, cmd_meas_temp_no_hold, sizeof(cmd_meas_temp_no_hold)) != 0) {
jurica238814 0:cc2c5d49fe63 187 return -1;
jurica238814 0:cc2c5d49fe63 188 }
jurica238814 0:cc2c5d49fe63 189
jurica238814 0:cc2c5d49fe63 190 return 0;
jurica238814 0:cc2c5d49fe63 191 }
jurica238814 0:cc2c5d49fe63 192
jurica238814 0:cc2c5d49fe63 193 //******************************************************************************
jurica238814 0:cc2c5d49fe63 194 int Si7006::checkTemperature(int16_t *tempCx10){
jurica238814 0:cc2c5d49fe63 195 char data[3];
jurica238814 0:cc2c5d49fe63 196 uint16_t code;
jurica238814 0:cc2c5d49fe63 197 int temp;
jurica238814 0:cc2c5d49fe63 198
jurica238814 0:cc2c5d49fe63 199 if (i2c_->read(I2C_ADDR, data, 3) != 0) {
jurica238814 0:cc2c5d49fe63 200 return -1;
jurica238814 0:cc2c5d49fe63 201 }
jurica238814 0:cc2c5d49fe63 202
jurica238814 0:cc2c5d49fe63 203 // Get 16-bit value from bytes read
jurica238814 0:cc2c5d49fe63 204 code = ((uint16_t)data[0] << 8) + data[1];
jurica238814 0:cc2c5d49fe63 205
jurica238814 0:cc2c5d49fe63 206 // Calculate the temperature using the formula from the datasheet
jurica238814 0:cc2c5d49fe63 207 // Scaled by 100
jurica238814 0:cc2c5d49fe63 208 temp = ((((int)17572 * code) + 0x8000) >> 16) - 4685;
jurica238814 0:cc2c5d49fe63 209
jurica238814 0:cc2c5d49fe63 210 // Return value is to be scaled by 10
jurica238814 0:cc2c5d49fe63 211 *tempCx10 = (temp + 5) / 10;
jurica238814 0:cc2c5d49fe63 212
jurica238814 0:cc2c5d49fe63 213 return 0;
jurica238814 0:cc2c5d49fe63 214 }
jurica238814 0:cc2c5d49fe63 215
jurica238814 0:cc2c5d49fe63 216 //******************************************************************************
jurica238814 0:cc2c5d49fe63 217 int Si7006::checkTemperature(float *tempC){
jurica238814 0:cc2c5d49fe63 218 char data[3];
jurica238814 0:cc2c5d49fe63 219 uint16_t code;
jurica238814 0:cc2c5d49fe63 220
jurica238814 0:cc2c5d49fe63 221 if (i2c_->read(I2C_ADDR, data, 3) != 0) {
jurica238814 0:cc2c5d49fe63 222 return -1;
jurica238814 0:cc2c5d49fe63 223 }
jurica238814 0:cc2c5d49fe63 224
jurica238814 0:cc2c5d49fe63 225 // Get 16-bit value from bytes read
jurica238814 0:cc2c5d49fe63 226 code = ((uint16_t)data[0] << 8) + data[1];
jurica238814 0:cc2c5d49fe63 227
jurica238814 0:cc2c5d49fe63 228 // Calculate the temperature using the formula from the datasheet
jurica238814 0:cc2c5d49fe63 229 // Scaled by 100
jurica238814 0:cc2c5d49fe63 230 *tempC = (((float)175.72 * code) / 65536) - 46.85;
jurica238814 0:cc2c5d49fe63 231
jurica238814 0:cc2c5d49fe63 232 return 0;
jurica238814 0:cc2c5d49fe63 233 }
jurica238814 0:cc2c5d49fe63 234
jurica238814 0:cc2c5d49fe63 235 //******************************************************************************
jurica238814 0:cc2c5d49fe63 236 int Si7006::getHumidity(int16_t *humidx10){
jurica238814 0:cc2c5d49fe63 237 if (i2c_->write(I2C_ADDR, cmd_meas_humid, sizeof(cmd_meas_humid), true) != 0) {
jurica238814 0:cc2c5d49fe63 238 //return -1;
jurica238814 0:cc2c5d49fe63 239 }
jurica238814 0:cc2c5d49fe63 240 wait_ms(100);
jurica238814 0:cc2c5d49fe63 241 return checkHumidity(humidx10);
jurica238814 0:cc2c5d49fe63 242 }
jurica238814 0:cc2c5d49fe63 243
jurica238814 0:cc2c5d49fe63 244 //******************************************************************************
jurica238814 0:cc2c5d49fe63 245 int Si7006::getHumidity(float *humid){
jurica238814 0:cc2c5d49fe63 246 if (i2c_->write(I2C_ADDR, cmd_meas_humid, sizeof(cmd_meas_humid)) != 0) {
jurica238814 0:cc2c5d49fe63 247 //return -1;
jurica238814 0:cc2c5d49fe63 248 }
jurica238814 0:cc2c5d49fe63 249 wait_ms(100);
jurica238814 0:cc2c5d49fe63 250 return checkHumidity(humid);
jurica238814 0:cc2c5d49fe63 251 }
jurica238814 0:cc2c5d49fe63 252
jurica238814 0:cc2c5d49fe63 253 //******************************************************************************
jurica238814 0:cc2c5d49fe63 254 int Si7006::startHumidity(void){
jurica238814 0:cc2c5d49fe63 255 if (i2c_->write(I2C_ADDR, cmd_meas_humid_no_hold, sizeof(cmd_meas_humid_no_hold)) != 0) {
jurica238814 0:cc2c5d49fe63 256 return -1;
jurica238814 0:cc2c5d49fe63 257 }
jurica238814 0:cc2c5d49fe63 258
jurica238814 0:cc2c5d49fe63 259 return 0;
jurica238814 0:cc2c5d49fe63 260 }
jurica238814 0:cc2c5d49fe63 261
jurica238814 0:cc2c5d49fe63 262 //******************************************************************************
jurica238814 0:cc2c5d49fe63 263 int Si7006::checkHumidity(int16_t *humidx10){
jurica238814 0:cc2c5d49fe63 264 char data[3];
jurica238814 0:cc2c5d49fe63 265 uint16_t code;
jurica238814 0:cc2c5d49fe63 266
jurica238814 0:cc2c5d49fe63 267 if (i2c_->read(I2C_ADDR, data, 3) != 0) {
jurica238814 0:cc2c5d49fe63 268 return -1;
jurica238814 0:cc2c5d49fe63 269 }
jurica238814 0:cc2c5d49fe63 270
jurica238814 0:cc2c5d49fe63 271 // Get 16-bit value from bytes read
jurica238814 0:cc2c5d49fe63 272 code = ((uint16_t)data[0] << 8) + data[1];
jurica238814 0:cc2c5d49fe63 273
jurica238814 0:cc2c5d49fe63 274 // Calculate the humidity using the formula from the datasheet
jurica238814 0:cc2c5d49fe63 275 // Scaled by 10
jurica238814 0:cc2c5d49fe63 276 *humidx10 = ((((int)1250 * code) + 0x8000) >> 16) - 60;
jurica238814 0:cc2c5d49fe63 277
jurica238814 0:cc2c5d49fe63 278 // Check the crc
jurica238814 0:cc2c5d49fe63 279 char crc = crc8(data[0], 0x00);
jurica238814 0:cc2c5d49fe63 280 crc = crc8(data[1], crc);
jurica238814 0:cc2c5d49fe63 281 if(crc != data[2]) {
jurica238814 0:cc2c5d49fe63 282 return -1;
jurica238814 0:cc2c5d49fe63 283 }
jurica238814 0:cc2c5d49fe63 284
jurica238814 0:cc2c5d49fe63 285 return 0;
jurica238814 0:cc2c5d49fe63 286 }
jurica238814 0:cc2c5d49fe63 287
jurica238814 0:cc2c5d49fe63 288 //******************************************************************************
jurica238814 0:cc2c5d49fe63 289 int Si7006::checkHumidity(float *humid){
jurica238814 0:cc2c5d49fe63 290 char data[3];
jurica238814 0:cc2c5d49fe63 291 uint16_t code;
jurica238814 0:cc2c5d49fe63 292
jurica238814 0:cc2c5d49fe63 293 if (i2c_->read(I2C_ADDR, data, 3) != 0) {
jurica238814 0:cc2c5d49fe63 294 return -1;
jurica238814 0:cc2c5d49fe63 295 }
jurica238814 0:cc2c5d49fe63 296
jurica238814 0:cc2c5d49fe63 297 // Get 16-bit value from bytes read
jurica238814 0:cc2c5d49fe63 298 code = ((uint16_t)data[0] << 8) + data[1];
jurica238814 0:cc2c5d49fe63 299
jurica238814 0:cc2c5d49fe63 300 // Calculate the humidity using the formula from the datasheet
jurica238814 0:cc2c5d49fe63 301 *humid = (((float)125 * code) / 65536) - 6;
jurica238814 0:cc2c5d49fe63 302
jurica238814 0:cc2c5d49fe63 303 return 0;
jurica238814 0:cc2c5d49fe63 304 }
jurica238814 0:cc2c5d49fe63 305
jurica238814 0:cc2c5d49fe63 306 //******************************************************************************
jurica238814 0:cc2c5d49fe63 307 int Si7006::getPrevTemperature(float *tempC) {
jurica238814 0:cc2c5d49fe63 308 if (i2c_->write(I2C_ADDR, cmd_meas_prev_temp, sizeof(cmd_meas_prev_temp)) != 0) {
jurica238814 0:cc2c5d49fe63 309 return -1;
jurica238814 0:cc2c5d49fe63 310 }
jurica238814 0:cc2c5d49fe63 311 if(checkTemperature(tempC) != 0) {
jurica238814 0:cc2c5d49fe63 312 return -1;
jurica238814 0:cc2c5d49fe63 313 }
jurica238814 0:cc2c5d49fe63 314 return 0;
jurica238814 0:cc2c5d49fe63 315 }
jurica238814 0:cc2c5d49fe63 316
jurica238814 0:cc2c5d49fe63 317 //******************************************************************************
jurica238814 0:cc2c5d49fe63 318 int Si7006::getPrevTemperature(int16_t *tempCx10) {
jurica238814 0:cc2c5d49fe63 319 if (i2c_->write(I2C_ADDR, cmd_meas_prev_temp, sizeof(cmd_meas_prev_temp)) != 0) {
jurica238814 0:cc2c5d49fe63 320 return -1;
jurica238814 0:cc2c5d49fe63 321 }
jurica238814 0:cc2c5d49fe63 322 if(checkTemperature(tempCx10) != 0) {
jurica238814 0:cc2c5d49fe63 323 return -1;
jurica238814 0:cc2c5d49fe63 324 }
jurica238814 0:cc2c5d49fe63 325 return 0;
jurica238814 0:cc2c5d49fe63 326 }
jurica238814 0:cc2c5d49fe63 327
jurica238814 0:cc2c5d49fe63 328 //******************************************************************************
jurica238814 0:cc2c5d49fe63 329 int Si7006::getRev(char *rev){
jurica238814 0:cc2c5d49fe63 330 if (i2c_->write(I2C_ADDR, cmd_fw_ver, sizeof(cmd_fw_ver)) != 0) {
jurica238814 0:cc2c5d49fe63 331 return -1;
jurica238814 0:cc2c5d49fe63 332 }
jurica238814 0:cc2c5d49fe63 333 if (i2c_->read(I2C_ADDR, rev, 1) != 0) {
jurica238814 0:cc2c5d49fe63 334 return -1;
jurica238814 0:cc2c5d49fe63 335 }
jurica238814 0:cc2c5d49fe63 336
jurica238814 0:cc2c5d49fe63 337 return 0;
jurica238814 0:cc2c5d49fe63 338 }
jurica238814 0:cc2c5d49fe63 339
jurica238814 0:cc2c5d49fe63 340 //******************************************************************************
jurica238814 0:cc2c5d49fe63 341 int Si7006::heater(bool enable)
jurica238814 0:cc2c5d49fe63 342 {
jurica238814 0:cc2c5d49fe63 343 char data[2];
jurica238814 0:cc2c5d49fe63 344
jurica238814 0:cc2c5d49fe63 345 if (i2c_->write(I2C_ADDR, cmd_read_user1, sizeof(cmd_read_user1)) != 0) {
jurica238814 0:cc2c5d49fe63 346 return -1;
jurica238814 0:cc2c5d49fe63 347 }
jurica238814 0:cc2c5d49fe63 348
jurica238814 0:cc2c5d49fe63 349 if (i2c_->read(I2C_ADDR, &data[1], 1) != 0) {
jurica238814 0:cc2c5d49fe63 350 return -1;
jurica238814 0:cc2c5d49fe63 351 }
jurica238814 0:cc2c5d49fe63 352
jurica238814 0:cc2c5d49fe63 353 if (enable) {
jurica238814 0:cc2c5d49fe63 354 data[1] |= 0x04;
jurica238814 0:cc2c5d49fe63 355 } else {
jurica238814 0:cc2c5d49fe63 356 data[1] &= ~0x04;
jurica238814 0:cc2c5d49fe63 357 }
jurica238814 0:cc2c5d49fe63 358
jurica238814 0:cc2c5d49fe63 359 data[0] = cmd_write_user1[0];
jurica238814 0:cc2c5d49fe63 360
jurica238814 0:cc2c5d49fe63 361 if (i2c_->write(I2C_ADDR, data, 2) != 0) {
jurica238814 0:cc2c5d49fe63 362 return -1;
jurica238814 0:cc2c5d49fe63 363 }
jurica238814 0:cc2c5d49fe63 364
jurica238814 0:cc2c5d49fe63 365 return 0;
jurica238814 0:cc2c5d49fe63 366 }
jurica238814 0:cc2c5d49fe63 367
jurica238814 0:cc2c5d49fe63 368 //******************************************************************************
jurica238814 0:cc2c5d49fe63 369 char Si7006::crc8(char value, char seed)
jurica238814 0:cc2c5d49fe63 370 {
jurica238814 0:cc2c5d49fe63 371 int i;
jurica238814 0:cc2c5d49fe63 372
jurica238814 0:cc2c5d49fe63 373 for (i = 0; i < 8; i++) {
jurica238814 0:cc2c5d49fe63 374
jurica238814 0:cc2c5d49fe63 375 if ((value ^ seed) & 0x80) {
jurica238814 0:cc2c5d49fe63 376 seed <<= 1;
jurica238814 0:cc2c5d49fe63 377 seed ^= POLYVAL;
jurica238814 0:cc2c5d49fe63 378 } else {
jurica238814 0:cc2c5d49fe63 379 seed <<= 1;
jurica238814 0:cc2c5d49fe63 380 }
jurica238814 0:cc2c5d49fe63 381
jurica238814 0:cc2c5d49fe63 382 value <<= 1;
jurica238814 0:cc2c5d49fe63 383 }
jurica238814 0:cc2c5d49fe63 384
jurica238814 0:cc2c5d49fe63 385 return seed;
jurica238814 0:cc2c5d49fe63 386 }