contiki/platform/jn516x/dev/dr1199/pot-sensor.c
2015-09-23 14:38:31 +02:00

177 lines
6.2 KiB
C

/*
* Copyright (c) 2015 NXP B.V.
* 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 NXP B.V. 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 NXP B.V. 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 NXP B.V. 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.
*
* Author: Theo van Daele <theo.van.daele@nxp.com>
*
*/
#include "contiki.h"
#include "sys/etimer.h"
#include "lib/sensors.h"
#include "pot-sensor.h"
#include <stdlib.h>
#include <GenericBoard.h>
/*---------------------------------------------------------------------------*/
/* LOCAL DEFINITIONS */
/*---------------------------------------------------------------------------*/
/* #define DEBUG */
#ifdef DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
typedef enum {
POT_STATUS_NOT_INIT = 0,
POT_STATUS_INIT,
POT_STATUS_NOT_ACTIVE = POT_STATUS_INIT,
POT_STATUS_ACTIVE
} pot_status_t;
/* Absolute delta in pot level needed to generate event */
#define DELTA_POT_VALUE 1
/*---------------------------------------------------------------------------*/
/* LOCAL DATA DEFINITIONS */
/*---------------------------------------------------------------------------*/
const struct sensors_sensor pot_sensor;
volatile static pot_status_t pot_status = POT_STATUS_NOT_INIT;
static int prev_pot_event_val = 0;
static int pot_value = 0;
/*---------------------------------------------------------------------------*/
/* LOCAL FUNCTION PROTOTYPES */
/*---------------------------------------------------------------------------*/
PROCESS(POTSampling, "POT");
/*---------------------------------------------------------------------------*/
/* PUBLIC FUNCTIONS */
/*---------------------------------------------------------------------------*/
static int
configure(int type, int value)
{
if(type == SENSORS_HW_INIT) {
pot_status = POT_STATUS_INIT;
bPotEnable();
process_start(&POTSampling, NULL);
return 1;
} else if(type == SENSORS_ACTIVE) {
if(pot_status != POT_STATUS_NOT_INIT) {
if(value) {
/* ACTIVATE SENSOR */
bPotEnable();
prev_pot_event_val = 0;
/* Activate POT. */
PRINTF("POT ACTIVATED\n");
pot_status = POT_STATUS_ACTIVE;
process_post(&POTSampling, PROCESS_EVENT_MSG, (void *)&pot_status);
} else {
/* DE-ACTIVATE SENSOR */
bPotDisable();
PRINTF("POT DE-ACTIVATED\n");
pot_status = POT_STATUS_NOT_ACTIVE;
process_post(&POTSampling, PROCESS_EVENT_MSG, (void *)&pot_status);
}
return 1;
} else {
/*
POT must be intialised before being (de)-activated */
PRINTF("ERROR: NO HW_INIT POT\n");
return 0;
}
} else {
/* Non valid type */
return 0;
}
}
/*---------------------------------------------------------------------------*/
static int
status(int type)
{
if(type == SENSORS_ACTIVE) {
return pot_status == POT_STATUS_ACTIVE;
} else if(type == SENSORS_READY) {
return pot_status != POT_STATUS_NOT_INIT;
}
return 0;
}
/*---------------------------------------------------------------------------*/
static int
value(int type)
{
/* type: Not defined for the pot interface */
return pot_value;
}
/*---------------------------------------------------------------------------*/
/* LOCAL FUNCTIONS */
/*---------------------------------------------------------------------------*/
/* Process to get POT_SENSOR value.
POT is sampled. Sampling stopped when POT is de-activated.
Event is generated if pot value changed at least the value DELTA_POT_VALUE
since last event. */
PROCESS_THREAD(POTSampling, ev, data)
{
PROCESS_BEGIN();
static struct etimer et;
etimer_set(&et, CLOCK_SECOND / 10);
while(1) {
PROCESS_WAIT_EVENT_UNTIL((ev == PROCESS_EVENT_TIMER) || (ev == PROCESS_EVENT_MSG));
if(ev == PROCESS_EVENT_TIMER) {
/* Handle sensor reading. */
PRINTF("POT sample\n");
pot_value = u16ReadPotValue();
PRINTF("POT = %d\n", pot_value);
if(abs(pot_value - prev_pot_event_val) > DELTA_POT_VALUE) {
prev_pot_event_val = pot_value;
sensors_changed(&pot_sensor);
}
etimer_reset(&et);
} else {
/* ev == PROCESS_EVENT_MSG */
if(*(int *)data == POT_STATUS_NOT_ACTIVE) {
/* Stop sampling */
etimer_stop(&et);
} else if((*(int *)data == POT_STATUS_ACTIVE)) {
/* restart sampling */
etimer_restart(&et);
}
}
}
PROCESS_END();
}
/*---------------------------------------------------------------------------*/
/* Sensor defintion for sensor module */
SENSORS_SENSOR(pot_sensor, POT_SENSOR, value, configure, status);
/*---------------------------------------------------------------------------*/