124 lines
4.4 KiB
C
124 lines
4.4 KiB
C
/*
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* Copyright (c) 2016, 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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* 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 zoul-pm10-sensor
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* @{
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*
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* \file
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* GP2Y1010AU0F PM10 sensor example using the ADC sensors wrapper
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* \author
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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 "adc-sensors.h"
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#include "adc-zoul.h"
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#include "zoul-sensors.h"
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#include "dev/pm10-sensor.h"
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#include "dev/sys-ctrl.h"
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#include "lib/sensors.h"
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#include "dev/gpio.h"
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#include "dev/ioc.h"
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/*---------------------------------------------------------------------------*/
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#define PM10_SENSOR_PORT_BASE GPIO_PORT_TO_BASE(PM10_SENSOR_CTRL_PORT)
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#define PM10_SENSOR_PIN_MASK GPIO_PIN_MASK(PM10_SENSOR_CTRL_PIN)
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/*---------------------------------------------------------------------------*/
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static int pm10_channel;
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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 PM10_ERROR;
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}
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if(value) {
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/* Set as output, used as pulse-driven wave */
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GPIO_SOFTWARE_CONTROL(PM10_SENSOR_PORT_BASE, PM10_SENSOR_PIN_MASK);
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ioc_set_over(PM10_SENSOR_CTRL_PORT, PM10_SENSOR_CTRL_PIN, IOC_OVERRIDE_DIS);
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GPIO_SET_OUTPUT(PM10_SENSOR_PORT_BASE, PM10_SENSOR_PIN_MASK);
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GPIO_CLR_PIN(PM10_SENSOR_PORT_BASE, PM10_SENSOR_PIN_MASK);
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pm10_channel = (1 << value);
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return adc_zoul.configure(SENSORS_HW_INIT, pm10_channel);
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}
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pm10_channel = 0;
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return PM10_SUCCESS;
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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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uint32_t val;
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if(!pm10_channel) {
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return PM10_ERROR;
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}
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/* Set Pulse Wave pin before measure */
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GPIO_SET_PIN(PM10_SENSOR_PORT_BASE, PM10_SENSOR_PIN_MASK);
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/* Pulse wave delay */
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clock_delay_usec(PM10_SENSOR_PULSE_DELAY);
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/* Data acquisition */
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val = (uint32_t)adc_zoul.value(pm10_channel);
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if(val == ZOUL_SENSORS_ERROR) {
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printf("PM10 sensor: failed retrieving data\n");
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return PM10_ERROR;
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}
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/* Default voltage divisor relation is 5/3 aprox, change at adc_wrapper.h,
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* calculations below assume a decimation rate of 512 (12 bits ENOB) and
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* AVVD5 voltage reference of 3.3V
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*/
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val *= PM10_EXTERNAL_VREF;
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val /= PM10_EXTERNAL_VREF_CROSSVAL;
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/* Applied constant conversion from UAir project
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* to obtain value in ppm (value in mV * 0.28)
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*/
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val *= 28;
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val /= 1000;
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/* Clear pulse wave pin */
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GPIO_CLR_PIN(PM10_SENSOR_PORT_BASE, PM10_SENSOR_PIN_MASK);
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return (uint16_t)val;
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}
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/*---------------------------------------------------------------------------*/
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SENSORS_SENSOR(pm10, PM10_SENSOR, value, configure, NULL);
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/*---------------------------------------------------------------------------*/
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/** @} */
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