esp-open-rtos/extras/bh1750/bh1750.c

/*
 * Driver for BH1750 light sensor
 *
 * Part of esp-open-rtos
 * Copyright (C) 2017 Andrej Krutak <dev@andree.sk>
 * BSD Licensed as described in the file LICENSE
 */
#include "bh1750.h"
#include <stdio.h>

void bh1750_configure(i2c_dev_t *dev, uint8_t mode)
{
	i2c_slave_write(dev->bus, dev->addr, NULL, &mode, 1);
}

uint16_t bh1750_read(i2c_dev_t *dev)
{
	uint8_t buf[2];
	uint16_t level;

	i2c_slave_read(dev->bus, dev->addr, NULL, buf, 2);

	level = buf[0] << 8 | buf[1];
	level = (level * 10) / 12; // convert to LUX

	return level;
}