1/* 2 * Author: Jon Trulson <jtrulson@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 "ta12200.h" 30 31using namespace upm; 32using namespace std; 33 34TA12200::TA12200(int pin) 35{ 36 initClock(); 37 38 if ( !(m_aio = mraa_aio_init(pin)) ) 39 { 40 throw std::invalid_argument(std::string(__FUNCTION__) + 41 ": mraa_aio_init() failed, invalid pin?"); 42 return; 43 } 44} 45 46TA12200::~TA12200() 47{ 48 mraa_aio_close(m_aio); 49} 50 51void TA12200::initClock() 52{ 53 gettimeofday(&m_startTime, NULL); 54} 55 56uint32_t TA12200::getMillis() 57{ 58 struct timeval elapsed, now; 59 uint32_t elapse; 60 61 // get current time 62 gettimeofday(&now, NULL); 63 64 // compute the delta since m_startTime 65 if( (elapsed.tv_usec = now.tv_usec - m_startTime.tv_usec) < 0 ) 66 { 67 elapsed.tv_usec += 1000000; 68 elapsed.tv_sec = now.tv_sec - m_startTime.tv_sec - 1; 69 } 70 else 71 { 72 elapsed.tv_sec = now.tv_sec - m_startTime.tv_sec; 73 } 74 75 elapse = (uint32_t)((elapsed.tv_sec * 1000) + (elapsed.tv_usec / 1000)); 76 77 // never return 0 78 if (elapse == 0) 79 elapse = 1; 80 81 return elapse; 82} 83 84 85unsigned int TA12200::highestValue() 86{ 87 unsigned int hiVal = 0; 88 unsigned int val; 89 uint32_t start = getMillis(); 90 91 // 1 second 92 while (getMillis() < (start + 1000)) 93 { 94 val = mraa_aio_read(m_aio); 95 if (val > hiVal) 96 hiVal = val; 97 } 98 99 return hiVal; 100} 101 102float TA12200::milliAmps(unsigned int val, int res) 103{ 104 float ampCurrent; 105 float effectiveVal; 106 107 // From grove wiki page: 108 // minimum_current=1/1024*5/800*2000000/1.414=8.6(mA) 109 // Only for sinusoidal alternating current 110 //ampCurrent = float(val) / float(res) * 5.0 / 800.0 * 2000000.0; 111 ampCurrent = float(val) / float(res) * 12500.0; 112 effectiveVal = ampCurrent/1.414; 113 return (effectiveVal); 114} 115 116