contiki/platform/zoul/dev/pm10-sensor.c

124 lines
4.4 KiB
C

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