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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 "cjq4435.h"
     30 
     31 using namespace upm;
     32 using namespace std;
     33 
     34 CJQ4435::CJQ4435(int pin)
     35 {
     36   if ( !(m_pwm = mraa_pwm_init(pin)) )
     37     {
     38       throw std::invalid_argument(std::string(__FUNCTION__) +
     39                                   ": mraa_pwm_init() failed, invalid pin?");
     40       return;
     41     }
     42 
     43   m_enabled = false;
     44 }
     45 
     46 CJQ4435::~CJQ4435()
     47 {
     48   if (m_enabled)
     49     mraa_pwm_enable(m_pwm, 0);
     50 
     51   mraa_pwm_close(m_pwm);
     52 }
     53 
     54 void CJQ4435::setPeriodUS(int us)
     55 {
     56   if (mraa_pwm_period_us(m_pwm, us) != MRAA_SUCCESS)
     57     cerr << __FUNCTION__ << ": period specified is not supported"
     58          << endl;
     59 }
     60 
     61 void CJQ4435::setPeriodMS(int ms)
     62 {
     63   if (mraa_pwm_period_ms(m_pwm, ms) != MRAA_SUCCESS)
     64     cerr << __FUNCTION__ << ": period specified is not supported"
     65          << endl;
     66 }
     67 
     68 void CJQ4435::setPeriodSeconds(float seconds)
     69 {
     70   if (mraa_pwm_period(m_pwm, seconds) != MRAA_SUCCESS)
     71     cerr << __FUNCTION__ << ": period specified is not supported"
     72          << endl;
     73 }
     74 
     75 void CJQ4435::enable(bool enable)
     76 {
     77   m_enabled = enable;
     78   mraa_pwm_enable(m_pwm, ((enable) ? 1 : 0));
     79 }
     80 
     81 void CJQ4435::setDutyCycle(float dutyCycle)
     82 {
     83   if (dutyCycle < 0.0)
     84     dutyCycle = 0.0;
     85 
     86   if (dutyCycle > 1.0)
     87     dutyCycle = 1.0;
     88 
     89   mraa_pwm_write(m_pwm, dutyCycle);
     90 }
     91 
     92 void CJQ4435::on()
     93 {
     94   // set a 1 second period, with 100% duty cycle
     95 
     96   enable(false);
     97   setPeriodUS(1000);
     98   setDutyCycle(1.0);
     99   enable(true);
    100 }
    101 
    102 void CJQ4435::off()
    103 {
    104   // set a 1 second period, with 0% duty cycle
    105 
    106   enable(false);
    107   setPeriodUS(1000);
    108   setDutyCycle(0.0);
    109   enable(true);
    110 }
    111 
    112