contiki/core/lib/sensors.c

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/*
* Copyright (c) 2005, Swedish Institute of Computer Science
* 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.
*
* @(#)$Id: sensors.c,v 1.1 2006/06/17 22:41:18 adamdunkels Exp $
*/
/* exeperimental code, will be renamed to sensors.c when done */
#include <string.h>
#include "contiki.h"
#include "lib/sensors.h"
extern struct sensors_sensor *sensors[];
extern unsigned char sensors_flags[];
extern struct process *sensors_selecting_proc[];
#define FLAG_CHANGED 0x80
process_event_t sensors_event;
static unsigned char num_sensors;
PROCESS(sensors_process, "Sensors");
/*---------------------------------------------------------------------------*/
static int
get_sensor_index(const struct sensors_sensor *s)
{
int i;
for(i = 0; i < num_sensors; ++i) {
if(sensors[i] == s) {
return i;
}
}
return i;
}
/*---------------------------------------------------------------------------*/
void
sensors_add_irq(const struct sensors_sensor *s, unsigned char irq)
{
sensors_flags[get_sensor_index(s)] |= irq;
}
/*---------------------------------------------------------------------------*/
void
sensors_remove_irq(const struct sensors_sensor *s, unsigned char irq)
{
sensors_flags[get_sensor_index(s)] &= ~irq;
}
/*---------------------------------------------------------------------------*/
int
sensors_handle_irq(unsigned char irq_flag)
{
int i, w;
w = 0;
for(i = 0; i < num_sensors; ++i) {
if(sensors_flags[i] & irq_flag) {
w += sensors[i]->irq();
}
}
return w;
}
/*---------------------------------------------------------------------------*/
struct sensors_sensor *
sensors_first(void)
{
return sensors[0];
}
/*---------------------------------------------------------------------------*/
struct sensors_sensor *
sensors_next(const struct sensors_sensor *s)
{
return sensors[get_sensor_index(s) + 1];
}
/*---------------------------------------------------------------------------*/
void
sensors_changed(const struct sensors_sensor *s)
{
sensors_flags[get_sensor_index(s)] |= FLAG_CHANGED;
process_poll(&sensors_process);
}
/*---------------------------------------------------------------------------*/
struct sensors_sensor *
sensors_find(char *prefix)
{
int i;
unsigned short len;
/* Search through all processes and search for the specified process
name. */
len = strlen(prefix);
for(i = 0; i < num_sensors; ++i) {
if(strncmp(prefix, sensors[i]->type, len) == 0) {
return sensors[i];
}
}
return NULL;
}
/*---------------------------------------------------------------------------*/
#define SELCOLL ((struct process *)0x1)
void
sensors_select(const struct sensors_sensor *s, struct process *p)
{
int i = get_sensor_index(s);
if(sensors_selecting_proc[i] == NULL) {
sensors_selecting_proc[i] = p;
} else if(sensors_selecting_proc[i] == p) {
/* If the selecting process is already registered we do nothing */
} else {
/* Collision, revert to broadcast! */
sensors_selecting_proc[i] = SELCOLL;
}
}
/*---------------------------------------------------------------------------*/
void
sensors_unselect(const struct sensors_sensor *s, const struct process *p)
{
int i = get_sensor_index(s);
if(sensors_selecting_proc[i] == p) {
sensors_selecting_proc[i] = NULL;
} else {
/* We collided and must continue to use broadcast! */
}
}
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(sensors_process, ev, data)
{
int i;
PROCESS_BEGIN();
for(i = 0; sensors[i] != NULL; ++i) {
sensors_flags[i] = 0;
sensors[i]->init();
}
num_sensors = i;
sensors_event = process_alloc_event();
irq_init();
while(1) {
PROCESS_WAIT_EVENT();
for(i = 0; i < num_sensors; ++i) {
if(sensors_flags[i] & FLAG_CHANGED) {
if(sensors_selecting_proc[i] == SELCOLL
|| sensors_selecting_proc[i] == NULL)
process_post(PROCESS_BROADCAST, sensors_event, sensors[i]);
else
process_post(sensors_selecting_proc[i], sensors_event, sensors[i]);
sensors_flags[i] &= ~FLAG_CHANGED;
}
}
}
PROCESS_END();
}
/*---------------------------------------------------------------------------*/