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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 "rpr220.h"
     30 
     31 using namespace upm;
     32 using namespace std;
     33 
     34 RPR220::RPR220(int pin)
     35 {
     36   m_isrInstalled = false;
     37 
     38   if ( !(m_gpio = mraa_gpio_init(pin)) )
     39    {
     40       throw std::invalid_argument(std::string(__FUNCTION__) +
     41                                   ": mraa_gpio_init() failed, invalid pin?");
     42       return;
     43     }
     44 
     45   mraa_gpio_dir(m_gpio, MRAA_GPIO_IN);
     46 }
     47 
     48 RPR220::~RPR220()
     49 {
     50   if (m_isrInstalled)
     51     uninstallISR();
     52 
     53   mraa_gpio_close(m_gpio);
     54 }
     55 
     56 bool RPR220::blackDetected()
     57 {
     58   return (mraa_gpio_read(m_gpio) ? true : false);
     59 }
     60 
     61 #ifdef JAVACALLBACK
     62 void RPR220::installISR(IsrCallback *cb)
     63 {
     64   installISR(generic_callback_isr, cb);
     65 }
     66 #endif
     67 
     68 void RPR220::installISR(void (*isr)(void *), void *arg)
     69 {
     70   if (m_isrInstalled)
     71     uninstallISR();
     72 
     73   // install our interrupt handler
     74   mraa_gpio_isr(m_gpio, MRAA_GPIO_EDGE_RISING,
     75                 isr, arg);
     76   m_isrInstalled = true;
     77 }
     78 
     79 void RPR220::uninstallISR()
     80 {
     81   mraa_gpio_isr_exit(m_gpio);
     82   m_isrInstalled = false;
     83 }
     84 
     85