1 /*
2 * Author: Jon Trulson <jtrulson@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 <iostream>
26 #include <string>
27 #include <stdexcept>
28
29 #include "ht9170.h"
30
31 using namespace upm;
32 using namespace std;
33
HT9170(int dr,int o1,int o2,int o3,int o4)34 HT9170::HT9170(int dr, int o1, int o2, int o3, int o4)
35 {
36 // init the gpio's we will need
37 if ( !(m_dr = mraa_gpio_init(dr)) )
38 {
39 throw std::invalid_argument(std::string(__FUNCTION__) +
40 ": mraa_gpio_init(dr) failed, invalid pin?");
41 return;
42 }
43 mraa_gpio_dir(m_dr, MRAA_GPIO_IN);
44
45 if ( !(m_o1 = mraa_gpio_init(o1)) )
46 {
47 throw std::invalid_argument(std::string(__FUNCTION__) +
48 ": mraa_gpio_init(o1) failed, invalid pin?");
49 return;
50 }
51 mraa_gpio_dir(m_o1, MRAA_GPIO_IN);
52
53 if ( !(m_o2 = mraa_gpio_init(o2)) )
54 {
55 throw std::invalid_argument(std::string(__FUNCTION__) +
56 ": mraa_gpio_init(o2) failed, invalid pin?");
57 return;
58 }
59 mraa_gpio_dir(m_o2, MRAA_GPIO_IN);
60
61 if ( !(m_o3 = mraa_gpio_init(o3)) )
62 {
63 throw std::invalid_argument(std::string(__FUNCTION__) +
64 ": mraa_gpio_init(o3) failed, invalid pin?");
65 return;
66 }
67 mraa_gpio_dir(m_o3, MRAA_GPIO_IN);
68
69 if ( !(m_o4 = mraa_gpio_init(o4)) )
70 {
71 throw std::invalid_argument(std::string(__FUNCTION__) +
72 ": mraa_gpio_init(o4) failed, invalid pin?");
73 return;
74 }
75 mraa_gpio_dir(m_o4, MRAA_GPIO_IN);
76 }
77
~HT9170()78 HT9170::~HT9170()
79 {
80 mraa_gpio_close(m_dr);
81 mraa_gpio_close(m_o1);
82 mraa_gpio_close(m_o2);
83 mraa_gpio_close(m_o3);
84 mraa_gpio_close(m_o4);
85 }
86
digitReady()87 bool HT9170::digitReady()
88 {
89 return (mraa_gpio_read(m_dr) ? true : false);
90 }
91
decodeDigit()92 char HT9170::decodeDigit()
93 {
94 // This lookup table is derived from the decode table on page 7 of
95 // the HT9170B/HT9170D datasheet.
96
97 static const char decode[16] = {
98 'D', // 0
99 '1', // 1
100 '2', // 2
101 '3', // 3
102 '4', // 4
103 '5', // 5
104 '6', // 6
105 '7', // 7
106 '8', // 8
107 '9', // 9
108 '0', // 10
109 '*', // 11
110 '#', // 12
111 'A', // 13
112 'B', // 14
113 'C' // 15
114 };
115
116 uint8_t bits = 0;
117
118 bits = mraa_gpio_read(m_o1);
119 bits |= (mraa_gpio_read(m_o2) << 1);
120 bits |= (mraa_gpio_read(m_o3) << 2);
121 bits |= (mraa_gpio_read(m_o4) << 3);
122
123 return decode[bits];
124 }
125