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64 lines
1.3 KiB
C
64 lines
1.3 KiB
C
/*
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* Copyright (C) 2020 Nalys
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*
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* This file is subject to the terms and conditions of the GNU Lesser General
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* Public License v2.1. See the file LICENSE in the top level directory for more
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* details.
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*/
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/**
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* @ingroup drivers_bh1900nux
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* @{
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*
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* @file
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* @brief BH1900NUX temperature sensor driver implementation
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*
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* @author Wouter Symons <wsymons@nalys-group.com>
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*
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* @}
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*/
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#include <stdio.h>
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#include "bh1900nux.h"
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#include "byteorder.h"
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#define ENABLE_DEBUG 0
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#include "debug.h"
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int bh1900nux_init(bh1900nux_t *dev, const bh1900nux_params_t *params)
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{
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if ((dev == NULL) | (params == NULL)) {
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return -1;
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}
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/* initialize the device descriptor */
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dev->i2c = params->i2c;
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dev->addr = params->addr;
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return BH1900NUX_OK;
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}
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int bh1900nux_read(const bh1900nux_t *dev, int16_t *temp)
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{
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int ret = 0;
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int16_t raw;
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/* Read raw sensor value */
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DEBUG("[bh1900nux] read temperature\n");
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i2c_acquire(dev->i2c);
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ret = i2c_read_regs(dev->i2c, dev->addr, BH1900NUX_REG_ADDR, &raw, sizeof(raw), 0);
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i2c_release(dev->i2c);
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if (ret < 0) {
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return ret;
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}
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/* Calculate temperature */
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raw = (int16_t) ntohs(raw) >> 4;
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*temp = ((int32_t) raw * 1000) / 16;
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return BH1900NUX_OK;
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}
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