1 /*
2 * Author: Yevgeniy Kiveisha <yevgeniy.kiveisha@intel.com>
3 * Contributions: Jon Trulson <jtlulson@ics.com>
4 * Copyright (c) 2014 Intel Corporation.
5 *
6 * Credits to Seeed Studeo.
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining
9 * a copy of this software and associated documentation files (the
10 * "Software"), to deal in the Software without restriction, including
11 * without limitation the rights to use, copy, modify, merge, publish,
12 * distribute, sublicense, and/or sell copies of the Software, and to
13 * permit persons to whom the Software is furnished to do so, subject to
14 * the following conditions:
15 *
16 * The above copyright notice and this permission notice shall be
17 * included in all copies or substantial portions of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
20 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
21 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
22 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
23 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
24 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
25 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 */
27
28 #include <iostream>
29 #include <unistd.h>
30 #include <stdlib.h>
31 #include <stdexcept>
32
33 #include "th02.h"
34
35 using namespace std;
36 using namespace upm;
37
TH02(int bus,uint8_t addr)38 TH02::TH02 (int bus, uint8_t addr) : m_i2c(bus) {
39 m_addr = addr;
40 m_name = "TH02";
41
42 mraa::Result ret = m_i2c.address(m_addr);
43 if (ret != mraa::SUCCESS) {
44 throw std::invalid_argument(std::string(__FUNCTION__) +
45 ": mraa_i2c_address() failed");
46 }
47 }
48
~TH02()49 TH02::~TH02 () {
50 }
51
52 float
getTemperature()53 TH02::getTemperature () {
54 uint16_t temperature = 0;
55
56 /* Start a new temperature conversion */
57 if (m_i2c.writeReg(TH02_REG_CONFIG, TH02_CMD_MEASURE_TEMP)) {
58 throw std::runtime_error(std::string(__FUNCTION__) +
59 ": I2c.writeReg() failed");
60 return 0.0;
61 }
62
63 /* Wait until conversion is done */
64 while (getStatus() == false);
65
66 temperature = m_i2c.readReg(TH02_REG_DATA_H) << 8;
67 temperature |= m_i2c.readReg(TH02_REG_DATA_L);
68 temperature >>= 2;
69
70 return ((float(temperature) / 32.0) - 50.0);
71 }
72
73 float
getHumidity()74 TH02::getHumidity () {
75 uint16_t humidity = 0;
76
77 /* Start a new humidity conversion */
78 if (m_i2c.writeReg(TH02_REG_CONFIG, TH02_CMD_MEASURE_HUMI)) {
79 throw std::runtime_error(std::string(__FUNCTION__) +
80 ": I2c.writeReg() failed");
81 return 0.0;
82 }
83
84 /* Wait until conversion is done */
85 while (getStatus() == false);
86
87 humidity = m_i2c.readReg(TH02_REG_DATA_H) << 8;
88 humidity |= m_i2c.readReg(TH02_REG_DATA_L);
89 humidity >>= 4;
90
91 return ((float(humidity) / 16.0) - 24.0);
92 }
93
94 bool
getStatus()95 TH02::getStatus () {
96 uint8_t status = m_i2c.readReg(TH02_REG_STATUS);
97
98 if (status & TH02_STATUS_RDY_MASK)
99 return false; // NOT ready
100 else
101 return true; // ready
102 }
103
104