1 /* 2 * Author: Jon Trulson <jtrulson (at) ics.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 29 #include "grovevdiv.h" 30 31 using namespace upm; 32 using namespace std; 33 34 GroveVDiv::GroveVDiv(int pin) 35 { 36 if ( !(m_aio = mraa_aio_init(pin)) ) 37 { 38 throw std::invalid_argument(std::string(__FUNCTION__) + 39 ": mraa_aio_init() failed, invalid pin?"); 40 return; 41 } 42 } 43 44 GroveVDiv::~GroveVDiv() 45 { 46 mraa_aio_close(m_aio); 47 } 48 49 unsigned int GroveVDiv::value(unsigned int samples) 50 { 51 unsigned int sum = 0; 52 53 for (int i=0; i<samples; i++) 54 { 55 sum += mraa_aio_read(m_aio); 56 usleep(2000); 57 } 58 59 return (sum / samples); 60 } 61 62 float GroveVDiv::computedValue(uint8_t gain, unsigned int val, int vref, int res) 63 { 64 return ((float(gain) * float(val) * float(vref) / float(res)) / 1000.0); 65 66 } 67 68
