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130 lines
3.4 KiB
C++
130 lines
3.4 KiB
C++
/*
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* Author: Yevgeniy Kiveisha <yevgeniy.kiveisha@intel.com>
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* Copyright (c) 2014 Intel Corporation.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <iostream>
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#include <unistd.h>
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#include <stdlib.h>
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#include "mlx90614.h"
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using namespace upm;
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struct MLX90614Exception : public std::exception {
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std::string message;
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MLX90614Exception (std::string msg) : message (msg) { }
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~MLX90614Exception () throw () { }
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const char* what() const throw () { return message.c_str(); }
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};
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MLX90614::MLX90614 (int bus, int devAddr) {
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m_name = "MLX90614";
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m_i2cAddr = devAddr;
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m_bus = bus;
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m_i2Ctx = mraa_i2c_init(m_bus);
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mraa_result_t ret = mraa_i2c_address(m_i2Ctx, m_i2cAddr);
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if (ret != MRAA_SUCCESS) {
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throw MLX90614Exception ("Couldn't initilize I2C.");
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}
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}
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MLX90614::~MLX90614() {
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mraa_i2c_stop(m_i2Ctx);
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}
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float
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MLX90614::readObjectTempF(void) {
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return (readTemperature (MLX90614_TOBJ1) * 9 / 5) + 32;
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}
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float
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MLX90614::readAmbientTempF(void) {
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return (readTemperature (MLX90614_TA) * 9 / 5) + 32;
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}
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float
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MLX90614::readObjectTempC(void) {
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return readTemperature (MLX90614_TOBJ1);
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}
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float
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MLX90614::readAmbientTempC(void) {
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return readTemperature (MLX90614_TA);
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}
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/*
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* **************
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* private area
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* **************
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*/
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uint16_t
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MLX90614::i2cReadReg_N (int reg, unsigned int len, uint8_t * buffer) {
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int readByte = 0;
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if (m_i2Ctx == NULL) {
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throw MLX90614Exception ("Couldn't find initilized I2C.");
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}
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mraa_i2c_address(m_i2Ctx, m_i2cAddr);
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mraa_i2c_write_byte(m_i2Ctx, reg);
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readByte = mraa_i2c_read(m_i2Ctx, buffer, len);
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return readByte;
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}
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mraa_result_t
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MLX90614::i2cWriteReg_N (uint8_t reg, unsigned int len, uint8_t * buffer) {
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mraa_result_t error = MRAA_SUCCESS;
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if (m_i2Ctx == NULL) {
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throw MLX90614Exception ("Couldn't find initilized I2C.");
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}
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error = mraa_i2c_address (m_i2Ctx, m_i2cAddr);
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error = mraa_i2c_write (m_i2Ctx, buffer, len);
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return error;
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}
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float
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MLX90614::readTemperature (uint8_t address) {
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uint8_t buffer[3];
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float temperature = 0;
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/* Reading temperature from sensor.
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Answer contained of 3 bytes (TEMP_LSB | TEMP_MSB | PEC)
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*/
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if (i2cReadReg_N (address, 3, buffer) > 2) {
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temperature = buffer[0];
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temperature = buffer[1] << 8;
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temperature *= .02;
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temperature -= 273.15;
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}
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return temperature;
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}
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