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203 lines
5.8 KiB
C
203 lines
5.8 KiB
C
/*
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* Copyright (c) 2005, Swedish Institute of Computer Science
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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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* @(#)$Id: sensors.c,v 1.2 2006/10/06 09:18:52 adamdunkels Exp $
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*/
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/* exeperimental code, will be renamed to sensors.c when done */
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#include <string.h>
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#include "contiki.h"
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#include "lib/sensors.h"
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extern struct sensors_sensor *sensors[];
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extern unsigned char sensors_flags[];
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extern struct process *sensors_selecting_proc[];
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#define FLAG_CHANGED 0x80
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process_event_t sensors_event;
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static unsigned char num_sensors;
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PROCESS(sensors_process, "Sensors");
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/*---------------------------------------------------------------------------*/
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static int
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get_sensor_index(const struct sensors_sensor *s)
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{
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int i;
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for(i = 0; i < num_sensors; ++i) {
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if(sensors[i] == s) {
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return i;
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}
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}
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return i;
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}
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/*---------------------------------------------------------------------------*/
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void
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sensors_add_irq(const struct sensors_sensor *s, unsigned char irq)
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{
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sensors_flags[get_sensor_index(s)] |= irq;
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}
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/*---------------------------------------------------------------------------*/
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void
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sensors_remove_irq(const struct sensors_sensor *s, unsigned char irq)
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{
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sensors_flags[get_sensor_index(s)] &= ~irq;
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}
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/*---------------------------------------------------------------------------*/
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int
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sensors_handle_irq(unsigned char irq_flag)
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{
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int i, w;
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w = 0;
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for(i = 0; i < num_sensors; ++i) {
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if(sensors_flags[i] & irq_flag) {
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w += sensors[i]->irq();
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}
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}
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return w;
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}
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/*---------------------------------------------------------------------------*/
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struct sensors_sensor *
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sensors_first(void)
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{
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return sensors[0];
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}
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/*---------------------------------------------------------------------------*/
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struct sensors_sensor *
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sensors_next(const struct sensors_sensor *s)
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{
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return sensors[get_sensor_index(s) + 1];
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}
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/*---------------------------------------------------------------------------*/
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void
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sensors_changed(const struct sensors_sensor *s)
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{
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sensors_flags[get_sensor_index(s)] |= FLAG_CHANGED;
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process_poll(&sensors_process);
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}
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/*---------------------------------------------------------------------------*/
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struct sensors_sensor *
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sensors_find(char *prefix)
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{
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int i;
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unsigned short len;
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/* Search through all processes and search for the specified process
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name. */
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len = strlen(prefix);
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for(i = 0; i < num_sensors; ++i) {
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if(strncmp(prefix, sensors[i]->type, len) == 0) {
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return sensors[i];
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}
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}
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return NULL;
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}
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/*---------------------------------------------------------------------------*/
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#define SELCOLL ((struct process *)0x1)
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void
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sensors_select(const struct sensors_sensor *s, struct process *p)
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{
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int i = get_sensor_index(s);
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if(sensors_selecting_proc[i] == NULL) {
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sensors_selecting_proc[i] = p;
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} else if(sensors_selecting_proc[i] == p) {
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/* If the selecting process is already registered we do nothing */
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} else {
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/* Collision, revert to broadcast! */
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sensors_selecting_proc[i] = SELCOLL;
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}
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}
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/*---------------------------------------------------------------------------*/
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void
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sensors_unselect(const struct sensors_sensor *s, const struct process *p)
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{
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int i = get_sensor_index(s);
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if(sensors_selecting_proc[i] == p) {
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sensors_selecting_proc[i] = NULL;
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} else {
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/* We collided and must continue to use broadcast! */
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}
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}
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/*---------------------------------------------------------------------------*/
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PROCESS_THREAD(sensors_process, ev, data)
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{
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static int i;
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static int events;
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PROCESS_BEGIN();
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for(i = 0; sensors[i] != NULL; ++i) {
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sensors_flags[i] = 0;
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sensors[i]->init();
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}
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num_sensors = i;
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sensors_event = process_alloc_event();
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irq_init();
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while(1) {
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PROCESS_WAIT_EVENT();
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do {
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events = 0;
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for(i = 0; i < num_sensors; ++i) {
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if(sensors_flags[i] & FLAG_CHANGED) {
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/* if(sensors_selecting_proc[i] == SELCOLL
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|| sensors_selecting_proc[i] == NULL)
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process_post(PROCESS_BROADCAST, sensors_event, sensors[i]);
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else
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process_post(sensors_selecting_proc[i], sensors_event, sensors[i]);*/
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if(process_post(PROCESS_BROADCAST, sensors_event, sensors[i]) == PROCESS_ERR_OK) {
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PROCESS_WAIT_EVENT_UNTIL(ev == sensors_event);
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}
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sensors_flags[i] &= ~FLAG_CHANGED;
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events++;
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}
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}
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} while(events);
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}
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PROCESS_END();
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}
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/*---------------------------------------------------------------------------*/
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