/* * Copyright (c) 2009, 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 1.5 2010/01/14 20:04:38 nifi 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[]; #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; } /*---------------------------------------------------------------------------*/ 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(const 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; } /*---------------------------------------------------------------------------*/ PROCESS_THREAD(sensors_process, ev, data) { static int i; static int events; PROCESS_BEGIN(); sensors_event = process_alloc_event(); for(i = 0; sensors[i] != NULL; ++i) { sensors_flags[i] = 0; sensors[i]->configure(SENSORS_HW_INIT, 0); } num_sensors = i; while(1) { PROCESS_WAIT_EVENT(); do { events = 0; for(i = 0; i < num_sensors; ++i) { if(sensors_flags[i] & FLAG_CHANGED) { if(process_post(PROCESS_BROADCAST, sensors_event, sensors[i]) == PROCESS_ERR_OK) { PROCESS_WAIT_EVENT_UNTIL(ev == sensors_event); } sensors_flags[i] &= ~FLAG_CHANGED; events++; } } } while(events); } PROCESS_END(); } /*---------------------------------------------------------------------------*/