1 /* 2 * Author: Marc Graham <marc (at) m2ag.net> 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 "micsv89.h" 26 27 using namespace upm; 28 29 MICSV89::MICSV89 (int bus, uint8_t address) { 30 m_name = "micsv89"; 31 m_valid = false; 32 m_address = address; 33 i2c = new mraa::I2c(bus); 34 if(i2c->frequency(mraa::I2C_STD) != mraa::SUCCESS){ 35 throw std::invalid_argument(std::string(__FUNCTION__) + ": I2c.frequency(I2C_STD) failed"); 36 return; 37 } 38 tx_buf[0] = 0x09; 39 tx_buf[1] = 0x00; 40 tx_buf[2] = 0x00; 41 } 42 43 void MICSV89::update() { 44 m_valid = false; 45 if(i2c->address(m_address) != mraa::SUCCESS){ 46 throw std::invalid_argument(std::string(__FUNCTION__) + ": I2c.address() failed"); 47 return; 48 } 49 if(i2c->write(tx_buf, 3) != mraa::SUCCESS){ 50 throw std::invalid_argument(std::string(__FUNCTION__) + ": I2c.write() failed"); 51 return; 52 } 53 sleep(1); //Give the device time to make the measurement. 54 if(i2c->address(m_address) != mraa::SUCCESS){ 55 throw std::invalid_argument(std::string(__FUNCTION__) + ": I2c.address() failed"); 56 return; 57 } 58 if(i2c->read(rx_buf, 6) != 6){ 59 throw std::invalid_argument(std::string(__FUNCTION__) + ": I2c.read() failed"); 60 return; 61 } 62 m_valid = true; 63 } 64 65 float MICSV89::co2equ() { 66 return ((rx_buf[0] - 13) * (1600/229) + 400); 67 } 68 69 int MICSV89::vocshort() { 70 return rx_buf[1]; 71 } 72 73 float MICSV89::tvoc() { 74 return rx_buf[2] * (1000/229); 75 } 76 77 float MICSV89::resistor() { 78 return 10 * (rx_buf[3] + (256 * rx_buf[4]) + (65536 * rx_buf[5])); 79 } 80 81 MICSV89::~MICSV89() { 82 delete i2c; 83 } 84
