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/*
* 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;
}
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