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/*
* Author: Jon Trulson <jtrulson@ics.com>
* Copyright (c) 2015 Intel Corporation.
*
* 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 <iostream>
#include <string>
#include <stdexcept>
#include "ht9170.h"
using namespace upm;
using namespace std;
HT9170::HT9170(int dr, int o1, int o2, int o3, int o4)
{
// init the gpio's we will need
if ( !(m_dr = mraa_gpio_init(dr)) )
{
throw std::invalid_argument(std::string(__FUNCTION__) +
": mraa_gpio_init(dr) failed, invalid pin?");
return;
}
mraa_gpio_dir(m_dr, MRAA_GPIO_IN);
if ( !(m_o1 = mraa_gpio_init(o1)) )
{
throw std::invalid_argument(std::string(__FUNCTION__) +
": mraa_gpio_init(o1) failed, invalid pin?");
return;
}
mraa_gpio_dir(m_o1, MRAA_GPIO_IN);
if ( !(m_o2 = mraa_gpio_init(o2)) )
{
throw std::invalid_argument(std::string(__FUNCTION__) +
": mraa_gpio_init(o2) failed, invalid pin?");
return;
}
mraa_gpio_dir(m_o2, MRAA_GPIO_IN);
if ( !(m_o3 = mraa_gpio_init(o3)) )
{
throw std::invalid_argument(std::string(__FUNCTION__) +
": mraa_gpio_init(o3) failed, invalid pin?");
return;
}
mraa_gpio_dir(m_o3, MRAA_GPIO_IN);
if ( !(m_o4 = mraa_gpio_init(o4)) )
{
throw std::invalid_argument(std::string(__FUNCTION__) +
": mraa_gpio_init(o4) failed, invalid pin?");
return;
}
mraa_gpio_dir(m_o4, MRAA_GPIO_IN);
}
HT9170::~HT9170()
{
mraa_gpio_close(m_dr);
mraa_gpio_close(m_o1);
mraa_gpio_close(m_o2);
mraa_gpio_close(m_o3);
mraa_gpio_close(m_o4);
}
bool HT9170::digitReady()
{
return (mraa_gpio_read(m_dr) ? true : false);
}
char HT9170::decodeDigit()
{
// This lookup table is derived from the decode table on page 7 of
// the HT9170B/HT9170D datasheet.
static const char decode[16] = {
'D', // 0
'1', // 1
'2', // 2
'3', // 3
'4', // 4
'5', // 5
'6', // 6
'7', // 7
'8', // 8
'9', // 9
'0', // 10
'*', // 11
'#', // 12
'A', // 13
'B', // 14
'C' // 15
};
uint8_t bits = 0;
bits = mraa_gpio_read(m_o1);
bits |= (mraa_gpio_read(m_o2) << 1);
bits |= (mraa_gpio_read(m_o3) << 2);
bits |= (mraa_gpio_read(m_o4) << 3);
return decode[bits];
}
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