| /* |
| * Author: Marc Graham <marc@m2ag.net> |
| * Copyright (c) 2015 Intel Corporation. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining |
| * a copy of this software and associated documentation files (the |
| * "Software"), to deal in the Software without restriction, including |
| * without limitation the rights to use, copy, modify, merge, publish, |
| * distribute, sublicense, and/or sell copies of the Software, and to |
| * permit persons to whom the Software is furnished to do so, subject to |
| * the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be |
| * included in all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE |
| * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION |
| * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION |
| * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| */ |
| |
| #include "micsv89.h" |
| |
| using namespace upm; |
| |
| MICSV89::MICSV89 (int bus, uint8_t address) { |
| m_name = "micsv89"; |
| m_valid = false; |
| m_address = address; |
| i2c = new mraa::I2c(bus); |
| if(i2c->address(m_address) != mraa::SUCCESS){ |
| throw std::invalid_argument(std::string(__FUNCTION__) + ": I2c.address() failed"); |
| return; |
| } |
| if(i2c->frequency(mraa::I2C_STD) != mraa::SUCCESS){ |
| throw std::invalid_argument(std::string(__FUNCTION__) + ": I2c.frequency(I2C_STD) failed"); |
| return; |
| } |
| tx_buf[0] = 0x09; |
| tx_buf[1] = 0x00; |
| tx_buf[2] = 0x00; |
| } |
| |
| void MICSV89::update() { |
| m_valid = false; |
| if(i2c->write(tx_buf, 3) != mraa::SUCCESS){ |
| throw std::invalid_argument(std::string(__FUNCTION__) + ": I2c.write() failed"); |
| return; |
| } |
| sleep(1); //Give the device time to make the measurement. |
| if(i2c->read(rx_buf, 6) != 6){ |
| throw std::invalid_argument(std::string(__FUNCTION__) + ": I2c.read() failed"); |
| return; |
| } |
| m_valid = true; |
| } |
| |
| float MICSV89::co2equ() { |
| return ((rx_buf[0] - 13) * (1600/229) + 400); |
| } |
| |
| int MICSV89::vocshort() { |
| return rx_buf[1]; |
| } |
| |
| float MICSV89::tvoc() { |
| return rx_buf[2] * (1000/229); |
| } |
| |
| float MICSV89::resistor() { |
| return 10 * (rx_buf[3] + (256 * rx_buf[4]) + (65536 * rx_buf[5])); |
| } |
| |
| MICSV89::~MICSV89() { |
| delete i2c; |
| } |