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/*
* Author: Jon Trulson <jtrulson@ics.com>
* Copyright (c) 2015 Intel Corporation.
*
* Thanks to Adafruit for some important clues
*
* 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 <unistd.h>
#include <math.h>
#include <iostream>
#include <stdexcept>
#include <string>
#include "si114x.hpp"
using namespace upm;
using namespace std;
SI114X::SI114X(int bus, uint8_t address)
{
m_addr = address;
m_uvIndex = 0;
// setup our i2c link
if ( !(m_i2c = mraa_i2c_init(bus)) )
{
throw std::invalid_argument(std::string(__FUNCTION__) +
": mraa_i2c_init() failed");
return;
}
mraa_result_t rv;
if ( (rv = mraa_i2c_address(m_i2c, m_addr)) != MRAA_SUCCESS)
{
throw std::runtime_error(std::string(__FUNCTION__) +
": mraa_i2c_address() failed");
return;
}
// The data sheet recommends setting the UV calibration values to
// 0x7b, 0x6b, 0x01, and 0x00, however the adafruit code uses a
// different set of values, presumably calibrated to their specific
// implementation. We will use those defaults here, as this was
// developed on an adafruit device.
// Use setUVCalibration() to set a different set of values before
// calling init() if you need different values.
setUVCalibration(0x29, 0x89, 0x02, 0x00);
}
SI114X::~SI114X()
{
mraa_i2c_stop(m_i2c);
}
bool SI114X::writeByte(uint8_t reg, uint8_t byte)
{
mraa_result_t rv = mraa_i2c_write_byte_data(m_i2c, byte, reg);
if (rv != MRAA_SUCCESS)
{
throw std::runtime_error(std::string(__FUNCTION__) +
": mraa_i2c_write_byte() failed");
return false;
}
return true;
}
uint8_t SI114X::readByte(uint8_t reg)
{
int x = mraa_i2c_read_byte_data(m_i2c, reg);
if (x != -1) {
return (uint8_t) x;
}
return 0;
}
uint16_t SI114X::readWord(uint8_t reg)
{
int x = mraa_i2c_read_word_data(m_i2c, reg);
if (x != -1) {
return (uint16_t) x;
}
return 0;
}
void SI114X::setUVCalibration(uint8_t uvcoeff0, uint8_t uvcoeff1,
uint8_t uvcoeff2, uint8_t uvcoeff3)
{
m_uv_cal[0] = uvcoeff0;
m_uv_cal[1] = uvcoeff1;
m_uv_cal[2] = uvcoeff2;
m_uv_cal[3] = uvcoeff3;
};
void SI114X::writeParam(SI114X_PARAM_T param, uint8_t value)
{
// write a parameter to the RAM parameter area
// We write the value to the PARAM_WR register, then execute a
// PARAM_WRITE command
writeByte(REG_PARAM_WR, value);
// now write it to parameter memory
writeByte(REG_COMMAND, CMD_PARAM_SET | param);
}
uint8_t SI114X::readParam(SI114X_PARAM_T param)
{
// get the parameter into register REG_PARAM_READ, then read and return it.
writeByte(REG_COMMAND, CMD_PARAM_QUERY | param);
return readByte(REG_PARAM_READ);
}
void SI114X::reset()
{
// reset the device
// zero out measuring rate
writeByte(REG_MEAS_RATE0, 0);
writeByte(REG_MEAS_RATE1, 0);
// disable IRQ MODES
// these are undocumented in the datasheet, but mentioned in Adafruit's code
writeByte(REG_IRQ_MODE1, 0);
writeByte(REG_IRQ_MODE2, 0);
// turn off interrupts
writeByte(REG_INT_CFG, 0);
writeByte(REG_IRQ_STATUS, 0xff);
// send a reset
writeByte(REG_COMMAND, CMD_RESET);
usleep(100);
// set the hardware key
writeByte(REG_HW_KEY, SI114X_HW_KEY);
usleep(100);
}
void SI114X::initialize()
{
// initialize the device
// first, reset it
reset();
// UV coefficients
writeByte(REG_UCOEF0, m_uv_cal[0]);
writeByte(REG_UCOEF1, m_uv_cal[1]);
writeByte(REG_UCOEF2, m_uv_cal[2]);
writeByte(REG_UCOEF3, m_uv_cal[3]);
// enable UV sensor only for now
writeParam(PARAM_CHLIST, CHLIST_EN_UV);
// auto-measure speed - slowest - (rate * 31.25us)
writeByte(REG_MEAS_RATE0, 0xff); // 7.9ms
// set autorun
writeByte(REG_COMMAND, CMD_ALS_AUTO);
}
void SI114X::update()
{
// for now, just update the UV Index member variable
uint16_t uvi = readWord(REG_AUX_UVINDEX0);
m_uvIndex = float(uvi) / 100.0;
// Add any further data gets() here
return;
}
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