HDC1000.cpp

/*
    HDC1000.h
    A library for HDC1000 1.0

    Copyright (c) 2015 seeed technology inc.
    Website    : www.seeed.cc
    Author     : Pillar Zuo (baozhu.zuo@seeed.cc)
    Create Time: April 2015
    Change Log :

    The MIT License (MIT)

    Permission is hereby granted, free of charge, to any person obtaining a copy
    of this software and associated documentation files (the "Software"), to deal
    in the Software without restriction, including without limitation the rights
    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    copies of the Software, and to permit persons to whom the Software is
    furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included in
    all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    THE SOFTWARE.
*/

#include "HDC1000.h"
#include "Wire.h"
#if defined(__avr__)
    #include <util/delay.h>
#endif

HDC1000::HDC1000(uint8_t address, int drdyn_pin) {
    _addr = address;
    _drdyn_pin = drdyn_pin;

    if (_drdyn_pin > -1) {
        pinMode(_drdyn_pin, INPUT);
    }
}

uint8_t HDC1000::begin(uint8_t reset, uint8_t mode, uint8_t resolution, uint8_t heater) {
    Wire.begin();

    uint8_t config = mode | resolution | heater | reset;

    setConfig(config);

    return config;
}

uint16_t HDC1000::readConfig(void) {
    setReadRegister(HDC1000_CONFIG);

    return read16();
}

void HDC1000::setReadRegister(uint8_t reg) {
    Wire.beginTransmission(_addr);
    Wire.write(reg);
    Wire.endTransmission();

    if (_drdyn_pin > -1) while (digitalRead(_drdyn_pin) == HIGH); //using DRDYn pin
    else {
        delay(20);    //using 20ms delay instead
    }
}

void HDC1000::setConfig(uint8_t config) {
    Wire.beginTransmission(_addr);
    Wire.write(HDC1000_CONFIG); 							//accessing the configuration register
    Wire.write(config); 									//sending the config bits (MSB)
    Wire.write(0x00); 										//the last 8 bits must be zeroes
    Wire.endTransmission();
}

uint16_t HDC1000::read16() {
    uint8_t bytes = 2;
    uint16_t dest = 0;

    Wire.requestFrom(_addr, bytes);
    if (Wire.available() >= bytes) {
        dest = Wire.read() << 8;
        dest += Wire.read();
    }
    return dest;
}

uint16_t HDC1000::getRawTemp(void) {
    setReadRegister(HDC1000_TEMP);

    return read16();
}

uint16_t HDC1000::getRawHumi(void) {
    setReadRegister(HDC1000_HUMI);

    return read16();
}

double HDC1000::getTemp(void) {
    double temp = getRawTemp();

    return temp / 65536.0 * 165.0 - 40.0;
}

double HDC1000::getHumi(void) {
    double humi = getRawHumi();

    return humi / 65536.0 * 100.0;
}

boolean HDC1000::battery() {
    return (bitRead(readConfig(), 11));
}