Contiki 2.6

button-sensor.c

00001 /*
00002  * Copyright (c) 2006, Swedish Institute of Computer Science.
00003  * All rights reserved.
00004  *
00005  * Redistribution and use in source and binary forms, with or without
00006  * modification, are permitted provided that the following conditions
00007  * are met:
00008  * 1. Redistributions of source code must retain the above copyright
00009  *    notice, this list of conditions and the following disclaimer.
00010  * 2. Redistributions in binary form must reproduce the above copyright
00011  *    notice, this list of conditions and the following disclaimer in the
00012  *    documentation and/or other materials provided with the distribution.
00013  * 3. Neither the name of the Institute nor the names of its contributors
00014  *    may be used to endorse or promote products derived from this software
00015  *    without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
00018  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00019  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00020  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
00021  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00022  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
00023  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00024  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
00025  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
00026  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00027  * SUCH DAMAGE.
00028  *
00029  * $Id: button-sensor.c,v 1.6 2010/01/14 19:12:31 nifi Exp $
00030  */
00031 
00032 #include "lib/sensors.h"
00033 #include "dev/button-sensor.h"
00034 #include "lib/simEnvChange.h"
00035 
00036 const struct simInterface button_interface;
00037 const struct sensors_sensor button_sensor;
00038 static struct timer debouncetimer;
00039 
00040 // COOJA variables
00041 char simButtonChanged;
00042 char simButtonIsDown;
00043 char simButtonIsActive;
00044 /*---------------------------------------------------------------------------*/
00045 static int
00046 value(int type)
00047 {
00048   return simButtonIsDown || !timer_expired(&debouncetimer);
00049 }
00050 /*---------------------------------------------------------------------------*/
00051 static int
00052 configure(int type, int c)
00053 {
00054   if(type == SENSORS_ACTIVE) {
00055     simButtonIsActive = c;
00056     return 1;
00057   } else if(type == SENSORS_HW_INIT) {
00058     simButtonIsActive = 1;
00059     timer_set(&debouncetimer, 0);
00060     return 1;
00061   }
00062   return 0;
00063 }
00064 /*---------------------------------------------------------------------------*/
00065 static int
00066 status(int type)
00067 {
00068   return (type == SENSORS_ACTIVE) ? simButtonIsActive : 0;
00069 }
00070 /*---------------------------------------------------------------------------*/
00071 static void
00072 doInterfaceActionsBeforeTick(void)
00073 {
00074   // Check if button value has changed
00075   if(simButtonChanged && simButtonIsActive && simButtonIsDown) {
00076     if(timer_expired(&debouncetimer)) {
00077       timer_set(&debouncetimer, CLOCK_SECOND / 10);
00078       sensors_changed(&button_sensor);
00079     }
00080   }
00081   simButtonChanged = 0;
00082 }
00083 /*---------------------------------------------------------------------------*/
00084 static void
00085 doInterfaceActionsAfterTick(void)
00086 {
00087 }
00088 /*---------------------------------------------------------------------------*/
00089 
00090 SIM_INTERFACE(button_interface,
00091               doInterfaceActionsBeforeTick,
00092               doInterfaceActionsAfterTick);
00093 
00094 SENSORS_SENSOR(button_sensor, BUTTON_SENSOR,
00095                value, configure, status);