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70 lines
1.7 KiB
C
70 lines
1.7 KiB
C
/*
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* Copyright (C) 2017 Inria
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup drivers_veml6070
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* @{
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*
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* @file
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* @brief Device driver implementation for the VEML6070 UV sensor.
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*
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* @author Alexandre Abadie <alexandre.abadie@inria.fr>
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*
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* @}
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*/
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#include <math.h>
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#include "log.h"
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#include "veml6070.h"
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#include "veml6070_params.h"
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#include "periph/i2c.h"
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#define ENABLE_DEBUG 0
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#include "debug.h"
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#define VEML6070_ADDRH (0x39)
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#define VEML6070_ADDRL (0x38)
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/*---------------------------------------------------------------------------*
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* VEML6070 Core API *
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*---------------------------------------------------------------------------*/
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int veml6070_init(veml6070_t *dev, const veml6070_params_t * params)
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{
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dev->params = *params;
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/* Acquire exclusive access */
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i2c_acquire(dev->params.i2c_dev);
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i2c_write_byte(dev->params.i2c_dev, VEML6070_ADDRL,
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(uint8_t)(dev->params.itime << 2) | 0x02, 0);
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/* Release I2C device */
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i2c_release(dev->params.i2c_dev);
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return VEML6070_OK;
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}
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uint16_t veml6070_read_uv(const veml6070_t *dev)
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{
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/* Acquire exclusive access */
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i2c_acquire(dev->params.i2c_dev);
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uint8_t buffer[2];
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i2c_read_byte(dev->params.i2c_dev, VEML6070_ADDRL, &buffer[0], 0);
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i2c_read_byte(dev->params.i2c_dev, VEML6070_ADDRH, &buffer[1], 0);
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uint16_t uv = (uint16_t)(buffer[1] << 8) | buffer[0];
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/* Release I2C device */
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i2c_release(dev->params.i2c_dev);
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return uv;
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}
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