HDC1000/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"
#include <util/delay.h>

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

	uint8_t config = mode|resolution|heater;

	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;

	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));
}