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      1 /*
      2  * Author: Jon Trulson <jtrulson (at) 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 
     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 
     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 
     87 bool HT9170::digitReady()
     88 {
     89   return (mraa_gpio_read(m_dr) ? true : false);
     90 }
     91 
     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