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contiki/platform/openmote-cc2538/dev/max44009.c

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/*
* Copyright (c) 2014, OpenMote Technologies, S.L.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Contiki operating system.
*
*/
/*---------------------------------------------------------------------------*/
/**
* \addtogroup openmote-max44009-sensor
* @{
*
* \file
* Driver for the MAX44009 light sensor
*
* \author
* Pere Tuset <peretuset@openmote.com>
*/
/*---------------------------------------------------------------------------*/
#include "dev/i2c.h"
#include "dev/max44009.h"
#include "lib/sensors.h"
/*---------------------------------------------------------------------------*/
#define DEBUG 1
#if DEBUG
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
/*---------------------------------------------------------------------------*/
/**
* \name MAX44009 address and device identifier
* @{
*/
#define MAX44009_ADDRESS (0x4A)
#define MAX44009_NOT_FOUND (0x00)
/** @} */
/*---------------------------------------------------------------------------*/
/**
* \name MAX44009 register addresses
* @{
*/
#define MAX44009_INT_STATUS_ADDR (0x00) /* R */
#define MAX44009_INT_ENABLE_ADDR (0x01) /* R/W */
#define MAX44009_CONFIG_ADDR (0x02) /* R/W */
#define MAX44009_LUX_HIGH_ADDR (0x03) /* R */
#define MAX44009_LUX_LOW_ADDR (0x04) /* R */
#define MAX44009_THR_HIGH_ADDR (0x05) /* R/W */
#define MAX44009_THR_LOW_ADDR (0x06) /* R/W */
#define MAX44009_THR_TIMER_ADDR (0x07) /* R/W */
/** @} */
/*---------------------------------------------------------------------------*/
/**
* \name MAX44009 register values
* @{
*/
#define MAX44009_INT_STATUS_OFF (0x00)
#define MAX44009_INT_STATUS_ON (0x01)
#define MAX44009_INT_DISABLED (0x00)
#define MAX44009_INT_ENABLED (0x01)
#define MAX44009_CONFIG_DEFAULT (0 << 7)
#define MAX44009_CONFIG_CONTINUOUS (1 << 7)
#define MAX44009_CONFIG_AUTO (0 << 6)
#define MAX44009_CONFIG_MANUAL (1 << 6)
#define MAX44009_CONFIG_CDR_NORMAL (0 << 5)
#define MAX44009_CONFIG_CDR_DIVIDED (1 << 5)
#define MAX44009_CONFIG_INTEGRATION_800ms (0 << 0)
#define MAX44009_CONFIG_INTEGRATION_400ms (1 << 0)
#define MAX44009_CONFIG_INTEGRATION_200ms (2 << 0)
#define MAX44009_CONFIG_INTEGRATION_100ms (3 << 0)
#define MAX44009_CONFIG_INTEGRATION_50ms (4 << 0)
#define MAX44009_CONFIG_INTEGRATION_25ms (5 << 0)
#define MAX44009_CONFIG_INTEGRATION_12ms (6 << 0)
#define MAX44009_CONFIG_INTEGRATION_6ms (7 << 0)
#define MAX44009_DEFAULT_CONFIGURATION (MAX44009_CONFIG_DEFAULT | \
MAX44009_CONFIG_AUTO | \
MAX44009_CONFIG_CDR_NORMAL | \
MAX44009_CONFIG_INTEGRATION_100ms)
#define MAX44009_USER_CONFIGURATION (MAX44009_CONFIG_DEFAULT | \
MAX44009_CONFIG_AUTO | \
MAX44009_CONFIG_CDR_NORMAL | \
MAX44009_CONFIG_INTEGRATION_800ms)
/** @} */
/*---------------------------------------------------------------------------*/
static uint8_t enabled;
/*---------------------------------------------------------------------------*/
static void
max44009_init(void)
{
uint8_t max44009_address[5] = { MAX44009_INT_ENABLE_ADDR, MAX44009_CONFIG_ADDR, \
MAX44009_THR_HIGH_ADDR, MAX44009_THR_LOW_ADDR, \
MAX44009_THR_TIMER_ADDR };
uint8_t max44009_value[5];
uint8_t max44009_data[2];
uint8_t i;
max44009_value[0] = (MAX44009_INT_STATUS_OFF);
max44009_value[1] = (MAX44009_USER_CONFIGURATION);
max44009_value[2] = (0xFF);
max44009_value[3] = (0x00);
max44009_value[4] = (0xFF);
for(i = 0; i < sizeof(max44009_address) / sizeof(max44009_address[0]); i++) {
max44009_data[0] = max44009_address[i];
max44009_data[1] = max44009_value[i];
i2c_burst_send(MAX44009_ADDRESS, max44009_data, 2);
}
}
/*---------------------------------------------------------------------------*/
static void
max44009_reset(void)
{
uint8_t max44009_address[5] = { MAX44009_INT_ENABLE_ADDR, MAX44009_CONFIG_ADDR, \
MAX44009_THR_HIGH_ADDR, MAX44009_THR_LOW_ADDR, \
MAX44009_THR_TIMER_ADDR };
uint8_t max44009_value[5] = { 0x00, 0x03, 0xFF, 0x00, 0xFF };
uint8_t max44009_data[2];
uint8_t i;
for(i = 0; i < sizeof(max44009_address) / sizeof(max44009_address[0]); i++) {
max44009_data[0] = max44009_address[i];
max44009_data[1] = max44009_value[i];
i2c_burst_send(MAX44009_ADDRESS, max44009_data, 2);
}
}
/*---------------------------------------------------------------------------*/
static uint8_t
max44009_is_present(void)
{
uint8_t status;
uint8_t is_present;
i2c_single_send(MAX44009_ADDRESS, MAX44009_CONFIG_ADDR);
status = i2c_single_receive(MAX44009_ADDRESS, &is_present);
if(status != I2C_MASTER_ERR_NONE) {
return 0;
}
return is_present != MAX44009_NOT_FOUND;
}
/*---------------------------------------------------------------------------*/
static uint16_t
max44009_read_light(void)
{
uint8_t exponent, mantissa;
uint8_t max44009_data[2];
uint32_t result;
i2c_single_send(MAX44009_ADDRESS, MAX44009_LUX_HIGH_ADDR);
i2c_single_receive(MAX44009_ADDRESS, &max44009_data[0]);
i2c_single_send(MAX44009_ADDRESS, MAX44009_LUX_LOW_ADDR);
i2c_single_receive(MAX44009_ADDRESS, &max44009_data[1]);
exponent = ((max44009_data[0] >> 4) & 0x0E);
mantissa = ((max44009_data[0] & 0x0F) << 4) | (max44009_data[1] & 0x0F);
result = ((uint16_t)exponent << 8) | ((uint16_t)mantissa << 0);
return result;
}
/*---------------------------------------------------------------------------*/
static uint16_t
max44009_convert_light(uint16_t lux)
{
uint8_t exponent, mantissa;
uint32_t result;
exponent = (lux >> 8) & 0xFF;
exponent = (exponent == 0x0F ? exponent & 0x0E : exponent);
mantissa = (lux >> 0) & 0xFF;
result = 45 * (2 ^ exponent * mantissa) / 10;
return (uint16_t)result;
}
/*---------------------------------------------------------------------------*/
static int
status(int type)
{
switch(type) {
case SENSORS_ACTIVE:
case SENSORS_READY:
return enabled;
}
return 0;
}
/*---------------------------------------------------------------------------*/
static int
value(int type)
{
uint16_t value;
if(!enabled) {
PRINTF("MAX44009: sensor not started\n");
return MAX44009_ERROR;
}
if(type == MAX44009_READ_RAW_LIGHT) {
return max44009_read_light();
} else if(type == MAX44009_READ_LIGHT) {
value = max44009_read_light();
return max44009_convert_light(value);
} else {
PRINTF("MAX44009: invalid value requested\n");
return MAX44009_ERROR;
}
}
/*---------------------------------------------------------------------------*/
static int
configure(int type, int value)
{
if(type == MAX44009_ACTIVATE) {
if(!max44009_is_present()) {
return MAX44009_ERROR;
} else {
max44009_init();
enabled = 1;
return MAX44009_SUCCESS;
}
}
if((type == MAX44009_RESET) && enabled) {
max44009_reset();
return MAX44009_SUCCESS;
} else {
PRINTF("MAX44009: is not enabled\n");
return MAX44009_ERROR;
}
return MAX44009_ERROR;
}
/*---------------------------------------------------------------------------*/
SENSORS_SENSOR(max44009, MAX44009_SENSOR, value, configure, status);
/*---------------------------------------------------------------------------*/
/** @} */
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