/*

This is a library for the BH1750FVI Digital Light Sensor
breakout board.

The board uses I2C for communication. 2 pins are required to
interface to the device.


based on Christopher Laws, March, 2013 code.

*/

#include "SensorBH1750.h"
#include <util/delay.h>


void SensorBH1750::setup() {
  Wire.begin();
  configure(BH1750_CONTINUOUS_HIGH_RES_MODE);
}


void SensorBH1750::configure(uint8_t mode) {
    switch (mode) {
        case BH1750_CONTINUOUS_HIGH_RES_MODE:
        case BH1750_CONTINUOUS_HIGH_RES_MODE_2:
        case BH1750_CONTINUOUS_LOW_RES_MODE:
        case BH1750_ONE_TIME_HIGH_RES_MODE:
        case BH1750_ONE_TIME_HIGH_RES_MODE_2:
        case BH1750_ONE_TIME_LOW_RES_MODE:
            // apply a valid mode change
            write8(mode);
            _delay_ms(10);
            break;
        default:
            // Invalid measurement mode
            #if BH1750_DEBUG == 1
            Serial.println("Invalid measurement mode");
            #endif
            break;
    }
}

unsigned int SensorBH1750::getConsumption()
{
    return pulses;
}
void SensorBH1750::reset()
{
    pulses = 0;
}

unsigned int SensorBH1750::getLuminosity(void) {
  uint16_t level;

  Wire.beginTransmission(BH1750_I2CADDR);
  Wire.requestFrom(BH1750_I2CADDR, 2);
#if (ARDUINO >= 100)
  level = Wire.read();
  level <<= 8;
  level |= Wire.read();
#else
  level = Wire.receive();
  level <<= 8;
  level |= Wire.receive();
#endif
  Wire.endTransmission();

#if BH1750_DEBUG == 1
  Serial.print("Raw light level: ");
  Serial.println(level);
#endif

  level = level/1.2; // convert to lux

#if BH1750_DEBUG == 1
  Serial.print("Light level: ");
  Serial.println(level);
#endif
  return level;
}



/*********************************************************************/


void SensorBH1750::write8(uint8_t d) {
  Wire.beginTransmission(BH1750_I2CADDR);
#if (ARDUINO >= 100)
  Wire.write(d);
#else
  Wire.send(d);
#endif
  Wire.endTransmission();
}