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/*
* Author: Yevgeniy Kiveisha <yevgeniy.kiveisha@intel.com>
* Copyright (c) 2014 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 <iostream>
#include <unistd.h>
#include <stdlib.h>
#include <stdexcept>
#include "mlx90614.hpp"
using namespace upm;
MLX90614::MLX90614 (int bus, int devAddr) : m_i2Ctx(bus) {
m_name = "MLX90614";
m_i2cAddr = devAddr;
m_bus = bus;
mraa::Result ret = m_i2Ctx.address(m_i2cAddr);
if (ret != mraa::SUCCESS) {
throw std::invalid_argument(std::string(__FUNCTION__) +
": address() failed");
}
}
float
MLX90614::readObjectTempF(void) {
return (readTemperature(MLX90614_TOBJ1) * 9 / 5) + 32;
}
float
MLX90614::readAmbientTempF(void) {
return (readTemperature(MLX90614_TA) * 9 / 5) + 32;
}
float
MLX90614::readObjectTempC(void) {
return readTemperature(MLX90614_TOBJ1);
}
float
MLX90614::readAmbientTempC(void) {
return readTemperature(MLX90614_TA);
}
/*
* **************
* private area
* **************
*/
uint16_t
MLX90614::i2cReadReg_N (int reg, unsigned int len, uint8_t * buffer) {
int readByte = 0;
m_i2Ctx.address(m_i2cAddr);
m_i2Ctx.writeByte(reg);
readByte = m_i2Ctx.read(buffer, len);
return readByte;
}
mraa::Result
MLX90614::i2cWriteReg_N (uint8_t reg, unsigned int len, uint8_t * buffer) {
mraa::Result error = mraa::SUCCESS;
error = m_i2Ctx.address(m_i2cAddr);
error = m_i2Ctx.write(buffer, len);
return error;
}
float
MLX90614::readTemperature (uint8_t address) {
uint8_t buffer[3];
float temperature = 0;
/* Reading temperature from sensor.
Answer contained of 3 bytes (TEMP_LSB | TEMP_MSB | PEC)
*/
if (i2cReadReg_N(address, 3, buffer) > 2) {
temperature = buffer[0];
temperature = buffer[1] << 8;
temperature *= .02;
temperature -= 273.15;
}
return temperature;
}
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