1 /*
2  * Author: Zion Orent <sorent@ics.com>
3  * Copyright (c) 2015 Intel Corporation.
4  *
5  * Permission is hereby granted, free of charge, to any person obtaining
6  * a copy of this software and associated documentation files (the
7  * "Software"), to deal in the Software without restriction, including
8  * without limitation the rights to use, copy, modify, merge, publish,
9  * distribute, sublicense, and/or sell copies of the Software, and to
10  * permit persons to whom the Software is furnished to do so, subject to
11  * the following conditions:
12  *
13  * The above copyright notice and this permission notice shall be
14  * included in all copies or substantial portions of the Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
18  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
19  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
20  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
21  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
22  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23  */
24 
25 #include <string>
26 #include <stdexcept>
27 #include "waterlevel.h"
28 
29 using namespace upm;
30 
WaterLevel(int pin)31 WaterLevel::WaterLevel(int pin)
32 {
33     if ( !(m_gpio = mraa_gpio_init(pin)) )
34       {
35         throw std::invalid_argument(std::string(__FUNCTION__) +
36                                     ": mraa_gpio_init() failed, invalid pin?");
37         return;
38       }
39     mraa_gpio_dir(m_gpio, MRAA_GPIO_IN);
40 }
41 
~WaterLevel()42 WaterLevel::~WaterLevel()
43 {
44     mraa_gpio_close(m_gpio);
45 }
46 
isSubmerged()47 bool WaterLevel::isSubmerged()
48 {
49 	// Submerged causes 0; being above water is 1
50 	return (!(bool)mraa_gpio_read(m_gpio));
51 }
52