191 lines
7.1 KiB
C
191 lines
7.1 KiB
C
/*
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* Copyright (c) 2014, OpenMote Technologies, S.L.
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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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* This file is part of the Contiki operating system.
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*
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*/
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/*---------------------------------------------------------------------------*/
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/**
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* \addtogroup openmote-max44009-sensor
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* @{
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*
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* \file
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* Driver for the MAX44009 light sensor
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*
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* \author
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* Pere Tuset <peretuset@openmote.com>
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*/
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/*---------------------------------------------------------------------------*/
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#include "dev/i2c.h"
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#include "dev/max44009.h"
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/*---------------------------------------------------------------------------*/
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/**
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* \name MAX44009 address and device identifier
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* @{
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*/
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#define MAX44009_ADDRESS (0x4A)
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#define MAX44009_NOT_FOUND (0x00)
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/** @} */
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/*---------------------------------------------------------------------------*/
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/**
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* \name MAX44009 register addresses
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* @{
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*/
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#define MAX44009_INT_STATUS_ADDR (0x00) /* R */
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#define MAX44009_INT_ENABLE_ADDR (0x01) /* R/W */
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#define MAX44009_CONFIG_ADDR (0x02) /* R/W */
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#define MAX44009_LUX_HIGH_ADDR (0x03) /* R */
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#define MAX44009_LUX_LOW_ADDR (0x04) /* R */
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#define MAX44009_THR_HIGH_ADDR (0x05) /* R/W */
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#define MAX44009_THR_LOW_ADDR (0x06) /* R/W */
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#define MAX44009_THR_TIMER_ADDR (0x07) /* R/W */
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/** @} */
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/*---------------------------------------------------------------------------*/
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/**
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* \name MAX44009 register values
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* @{
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*/
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#define MAX44009_INT_STATUS_OFF (0x00)
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#define MAX44009_INT_STATUS_ON (0x01)
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#define MAX44009_INT_DISABLED (0x00)
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#define MAX44009_INT_ENABLED (0x01)
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#define MAX44009_CONFIG_DEFAULT (0 << 7)
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#define MAX44009_CONFIG_CONTINUOUS (1 << 7)
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#define MAX44009_CONFIG_AUTO (0 << 6)
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#define MAX44009_CONFIG_MANUAL (1 << 6)
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#define MAX44009_CONFIG_CDR_NORMAL (0 << 5)
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#define MAX44009_CONFIG_CDR_DIVIDED (1 << 5)
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#define MAX44009_CONFIG_INTEGRATION_800ms (0 << 0)
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#define MAX44009_CONFIG_INTEGRATION_400ms (1 << 0)
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#define MAX44009_CONFIG_INTEGRATION_200ms (2 << 0)
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#define MAX44009_CONFIG_INTEGRATION_100ms (3 << 0)
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#define MAX44009_CONFIG_INTEGRATION_50ms (4 << 0)
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#define MAX44009_CONFIG_INTEGRATION_25ms (5 << 0)
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#define MAX44009_CONFIG_INTEGRATION_12ms (6 << 0)
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#define MAX44009_CONFIG_INTEGRATION_6ms (7 << 0)
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#define MAX44009_DEFAULT_CONFIGURATION (MAX44009_CONFIG_DEFAULT | \
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MAX44009_CONFIG_AUTO | \
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MAX44009_CONFIG_CDR_NORMAL | \
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MAX44009_CONFIG_INTEGRATION_100ms)
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/** @} */
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/*---------------------------------------------------------------------------*/
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void
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max44009_init(void)
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{
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uint8_t max44009_address[5] = { MAX44009_INT_ENABLE_ADDR, MAX44009_CONFIG_ADDR, \
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MAX44009_THR_HIGH_ADDR, MAX44009_THR_LOW_ADDR, \
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MAX44009_THR_TIMER_ADDR };
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uint8_t max44009_value[5];
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uint8_t max44009_data[2];
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uint8_t i;
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max44009_value[0] = (MAX44009_INT_STATUS_ON);
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max44009_value[1] = (MAX44009_DEFAULT_CONFIGURATION);
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max44009_value[2] = (0xFF);
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max44009_value[3] = (0x00);
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max44009_value[4] = (0xFF);
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for(i = 0; i < sizeof(max44009_address) / sizeof(max44009_address[0]); i++) {
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max44009_data[0] = max44009_address[i];
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max44009_data[1] = max44009_value[i];
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i2c_burst_send(MAX44009_ADDRESS, max44009_data, 2);
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}
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}
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/*---------------------------------------------------------------------------*/
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void
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max44009_reset(void)
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{
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uint8_t max44009_address[5] = { MAX44009_INT_ENABLE_ADDR, MAX44009_CONFIG_ADDR, \
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MAX44009_THR_HIGH_ADDR, MAX44009_THR_LOW_ADDR, \
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MAX44009_THR_TIMER_ADDR };
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uint8_t max44009_value[5] = { 0x00, 0x03, 0xFF, 0x00, 0xFF };
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uint8_t max44009_data[2];
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uint8_t i;
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for(i = 0; i < sizeof(max44009_address) / sizeof(max44009_address[0]); i++) {
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max44009_data[0] = max44009_address[i];
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max44009_data[1] = max44009_value[i];
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i2c_burst_send(MAX44009_ADDRESS, max44009_data, 2);
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}
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}
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/*---------------------------------------------------------------------------*/
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uint8_t
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max44009_is_present(void)
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{
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uint8_t status;
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uint8_t is_present;
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i2c_single_send(MAX44009_ADDRESS, MAX44009_CONFIG_ADDR);
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status = i2c_single_receive(MAX44009_ADDRESS, &is_present);
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if(status != I2C_MASTER_ERR_NONE) {
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return 0;
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}
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return is_present != MAX44009_NOT_FOUND;
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}
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/*---------------------------------------------------------------------------*/
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uint16_t
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max44009_read_light(void)
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{
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uint8_t exponent, mantissa;
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uint8_t max44009_data[2];
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uint16_t result;
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i2c_single_send(MAX44009_ADDRESS, MAX44009_LUX_HIGH_ADDR);
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i2c_single_receive(MAX44009_ADDRESS, &max44009_data[0]);
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i2c_single_send(MAX44009_ADDRESS, MAX44009_LUX_LOW_ADDR);
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i2c_single_receive(MAX44009_ADDRESS, &max44009_data[1]);
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exponent = ((max44009_data[0] >> 4) & 0x0E);
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mantissa = ((max44009_data[0] & 0x0F) << 4) | (max44009_data[1] & 0x0F);
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result = ((uint16_t)exponent << 8) | ((uint16_t)mantissa << 0);
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return result;
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}
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/*---------------------------------------------------------------------------*/
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float
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max44009_convert_light(uint16_t lux)
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{
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uint8_t exponent, mantissa;
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float result = 0.045;
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exponent = (lux >> 8) & 0xFF;
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exponent = (exponent == 0x0F ? exponent & 0x0E : exponent);
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mantissa = (lux >> 0) & 0xFF;
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result *= 2 ^ exponent * mantissa;
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return result;
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}
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/*---------------------------------------------------------------------------*/
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/** @} */
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