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177 lines
5.5 KiB
C
177 lines
5.5 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-tsl2563-sensor
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* @{
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*
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* \file
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* Driver for the external TSL2563 light sensor
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*
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* \author
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* Antonio Lignan <alinan@zolertia.com>
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* Toni Lozano <tlozano@zolertia.com>
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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 "lib/sensors.h"
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#include "tsl2563.h"
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/*---------------------------------------------------------------------------*/
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static uint8_t enabled;
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/*---------------------------------------------------------------------------*/
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static uint16_t
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calculateLux(uint8_t *buf)
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{
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uint32_t ch0, ch1 = 0;
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uint32_t aux = (1 << 14);
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uint32_t ratio, lratio, tmp = 0;
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uint16_t buffer[2];
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buffer[0] = (buf[1] << 8 | (buf[0]));
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buffer[1] = (buf[3] << 8 | (buf[2]));
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ch0 = (buffer[0] * aux) >> 10;
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ch1 = (buffer[1] * aux) >> 10;
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ratio = (ch1 << 10);
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ratio = ratio / ch0;
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lratio = (ratio + 1) >> 1;
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if((lratio >= 0) && (lratio <= K1T)) {
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tmp = (ch0 * B1T) - (ch1 * M1T);
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} else if(lratio <= K2T) {
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tmp = (ch0 * B2T) - (ch1 * M2T);
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} else if(lratio <= K3T) {
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tmp = (ch0 * B3T) - (ch1 * M3T);
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} else if(lratio <= K4T) {
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tmp = (ch0 * B4T) - (ch1 * M4T);
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} else if(lratio <= K5T) {
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tmp = (ch0 * B5T) - (ch1 * M5T);
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} else if(lratio <= K6T) {
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tmp = (ch0 * B6T) - (ch1 * M6T);
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} else if(lratio <= K7T) {
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tmp = (ch0 * B7T) - (ch1 * M7T);
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} else if(lratio > K8T) {
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tmp = (ch0 * B8T) - (ch1 * M8T);
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}
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if(tmp < 0) {
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tmp = 0;
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}
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tmp += (1 << 13);
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return tmp >> 14;
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}
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/*---------------------------------------------------------------------------*/
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static int
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tsl2563_read_reg(uint8_t reg, uint8_t *buf, uint8_t regNum)
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{
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if(i2c_single_send(TSL2563_ADDR, reg) == I2C_MASTER_ERR_NONE) {
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if(i2c_burst_receive(TSL2563_ADDR, buf, regNum) == I2C_MASTER_ERR_NONE) {
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return TSL2563_SUCCESS;
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}
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}
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return TSL2563_ERROR;
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}
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/*---------------------------------------------------------------------------*/
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static int
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light_ziglet_on(void)
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{
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if(i2c_single_send(TSL2563_ADDR, (uint8_t)TSL2563_PWRN) == I2C_MASTER_ERR_NONE) {
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return TSL2563_SUCCESS;
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}
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return TSL2563_ERROR;
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}
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/*---------------------------------------------------------------------------*/
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static int
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light_ziglet_off(void)
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{
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if(i2c_single_send(TSL2563_ADDR, (uint8_t)TSL2563_PWROFF) == I2C_MASTER_ERR_NONE) {
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return TSL2563_SUCCESS;
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}
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return TSL2563_ERROR;
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}
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/*---------------------------------------------------------------------------*/
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static int
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light_ziglet_read(uint16_t *lux)
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{
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uint8_t buf[4];
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if(light_ziglet_on() == TSL2563_SUCCESS) {
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if(tsl2563_read_reg(TSL2563_READ, buf, 4) == TSL2563_SUCCESS) {
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*lux = calculateLux(buf);
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return light_ziglet_off();
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}
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}
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return TSL2563_ERROR;
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}
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/*---------------------------------------------------------------------------*/
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static int
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configure(int type, int value)
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{
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if(type != SENSORS_ACTIVE) {
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return TSL2563_ERROR;
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}
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enabled = value;
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if(value) {
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i2c_init(I2C_SDA_PORT, I2C_SDA_PIN, I2C_SCL_PORT, I2C_SCL_PIN,
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I2C_SCL_NORMAL_BUS_SPEED);
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} else {
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light_ziglet_off();
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}
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return TSL2563_SUCCESS;
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}
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/*---------------------------------------------------------------------------*/
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static int
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status(int type)
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{
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switch(type) {
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case SENSORS_ACTIVE:
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case SENSORS_READY:
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return enabled;
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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static int
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value(int type)
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{
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uint16_t lux;
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if(type == TSL2563_VAL_READ) {
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if(light_ziglet_read(&lux) != TSL2563_ERROR) {
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return lux;
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}
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}
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return TSL2563_ERROR;
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}
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/*---------------------------------------------------------------------------*/
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SENSORS_SENSOR(tsl2563, TSL2563_SENSOR, value, configure, status);
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/*---------------------------------------------------------------------------*/
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/** @} */
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