deac/osd-contiki
1
0
Fork 0
Code Issues Pull requests Releases Wiki Activity

Modified ADC measurement of PM10 driver to include adc-zoul direct access

Browse source
This commit is contained in:
Toni Lozano 2016-01-26 14:08:17 +01:00
parent 8337843d69
commit 1f6dafecb0
5 changed files with 32 additions and 17 deletions
Download patch file Download diff file Expand all files Collapse all files

39
platform/zoul/dev/pm10-sensor.c
View file

@ -1,4 +1,4 @@
/*
/*
* Copyright (c) 2016, Zolertia <http://www.zolertia.com>
* All rights reserved.
*
@ -43,6 +43,8 @@
#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"
@ -52,7 +54,7 @@
#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 uint8_t enabled;
static int pm10_channel;
/*---------------------------------------------------------------------------*/
static int
configure(int type, int value)
@ -68,20 +70,20 @@ configure(int type, int value)
GPIO_SET_OUTPUT(PM10_SENSOR_PORT_BASE, PM10_SENSOR_PIN_MASK);
GPIO_CLR_PIN(PM10_SENSOR_PORT_BASE, PM10_SENSOR_PIN_MASK);
enabled = 1;
return adc_sensors.configure(ANALOG_PM10_SENSOR, value);
pm10_channel = (1 << value);
return adc_zoul.configure(SENSORS_HW_INIT, pm10_channel);
}
enabled = 0;
pm10_channel = 0;
return PM10_SUCCESS;
}
/*---------------------------------------------------------------------------*/
static int
value(int type)
{
uint16_t val;
uint32_t val;
if(!enabled) {
if(!pm10_channel) {
return PM10_ERROR;
}
@ -90,17 +92,30 @@ value(int type)
/* Pulse wave delay */
clock_delay_usec(PM10_SENSOR_PULSE_DELAY);
/* Data acquisition */
val = adc_sensors.value(ANALOG_PM10_SENSOR);
/* Clear pulse wave pin */
GPIO_CLR_PIN(PM10_SENSOR_PORT_BASE, PM10_SENSOR_PIN_MASK);
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;
return val;
/* 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);