75 lines
2.7 KiB
C
75 lines
2.7 KiB
C
/*
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* Copyright (c) 2015, Zolertia - http://www.zolertia.com
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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/*---------------------------------------------------------------------------*/
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/**
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* \addtogroup zoul-tmp102-sensor
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* @{
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*
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* \file
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* Driver for the TMP102 temperature sensor
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*/
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/*---------------------------------------------------------------------------*/
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#include <stdio.h>
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#include "contiki.h"
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#include "dev/i2c.h"
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#include "tmp102.h"
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void
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tmp102_init(void)
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{
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i2c_init(I2C_SDA_PORT, I2C_SDA_PIN, I2C_SCL_PORT, I2C_SCL_PIN, I2C_SCL_NORMAL_BUS_SPEED);
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}
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/*---------------------------------------------------------------------------*/
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uint8_t
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tmp102_read(uint16_t *data)
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{
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uint8_t buf[2];
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uint16_t temp;
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/* Write to the temperature register to trigger a reading */
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if(i2c_single_send(TMP102_ADDR, TMP102_TEMP) == I2C_MASTER_ERR_NONE) {
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/* Read two bytes only */
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if(i2c_burst_receive(TMP102_ADDR, buf, 2) == I2C_MASTER_ERR_NONE) {
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/* 12-bit value, TMP102 SBOS397F Table 8-9 */
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temp = (buf[0] << 4) + (buf[1] >> 4);
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if(temp > 2047) {
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temp -= (1 << 12);
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}
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temp *= 0.625;
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*data = temp;
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return I2C_MASTER_ERR_NONE;
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}
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}
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return i2c_master_error();
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}
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/*---------------------------------------------------------------------------*/
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/** @} */
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