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      1 /*
      2  * Author: Yevgeniy Kiveisha <yevgeniy.kiveisha (at) intel.com>
      3  * Copyright (c) 2014 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 #include <unistd.h>
     29 
     30 #include "buzzer.h"
     31 
     32 using namespace upm;
     33 using namespace std;
     34 
     35 Buzzer::Buzzer(int pinNumber) {
     36     m_pwm_context = mraa_pwm_init(pinNumber);
     37     if(m_pwm_context == 0)
     38     {
     39         throw std::invalid_argument(std::string(__FUNCTION__) +
     40                                     ": mraa_pwm_init() failed, invalid pin?");
     41         return;
     42     }
     43     m_name = "Buzzer";
     44     mraa_pwm_enable (m_pwm_context, 1);
     45     Buzzer::setVolume(1.0);
     46 }
     47 
     48 void Buzzer::setVolume(float vol){
     49     m_volume = vol;
     50 }
     51 
     52 float Buzzer::getVolume(){
     53     return m_volume;
     54 }
     55 
     56 int Buzzer::playSound(int note, int delay) {
     57     mraa_pwm_period_us(m_pwm_context, note);
     58     mraa_pwm_write(m_pwm_context, m_volume * 0.5);
     59     if(delay){
     60         usleep(delay);
     61         Buzzer::stopSound();
     62     }
     63     return note;
     64 }
     65 
     66 void Buzzer::stopSound(){
     67     // Has to be checked out on a scope and make sure it's flat 0
     68     mraa_pwm_period_us(m_pwm_context, 1);
     69     mraa_pwm_write(m_pwm_context, 0);
     70 }
     71 
     72 Buzzer::~Buzzer() {
     73     Buzzer::stopSound();
     74     mraa_pwm_enable(m_pwm_context, 0);
     75     mraa_pwm_close(m_pwm_context);
     76 }
     77 
     78