button-sensor.c

00001 /*
00002  * Copyright (c) 2005, 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  * This file is part of the Contiki operating system.
00030  *
00031  * @(#)$Id: button-sensor.c,v 1.4 2010/01/14 20:01:19 nifi Exp $
00032  */
00033 #include "lib/sensors.h"
00034 #include "dev/hwconf.h"
00035 #include "dev/button-sensor.h"
00036 #include <signal.h>
00037 
00038 const struct sensors_sensor button_sensor;
00039 
00040 static struct timer debouncetimer;
00041 static int status(int type);
00042 
00043 HWCONF_PIN(BUTTON, 2, 7);
00044 HWCONF_IRQ(BUTTON, 2, 7);
00045 
00046 /*---------------------------------------------------------------------------*/
00047 interrupt(PORT2_VECTOR)
00048      irq_p2(void)
00049 {
00050   ENERGEST_ON(ENERGEST_TYPE_IRQ);
00051 
00052   if(BUTTON_CHECK_IRQ()) {
00053     if(timer_expired(&debouncetimer)) {
00054       timer_set(&debouncetimer, CLOCK_SECOND / 4);
00055       sensors_changed(&button_sensor);
00056       LPM4_EXIT;
00057     }
00058   }
00059   P2IFG = 0x00;
00060   ENERGEST_OFF(ENERGEST_TYPE_IRQ);
00061 }
00062 /*---------------------------------------------------------------------------*/
00063 static int
00064 value(int type)
00065 {
00066   return BUTTON_READ() || !timer_expired(&debouncetimer);
00067 }
00068 /*---------------------------------------------------------------------------*/
00069 static int
00070 configure(int type, int c)
00071 {
00072   switch (type) {
00073   case SENSORS_ACTIVE:
00074     if (c) {
00075       if(!status(SENSORS_ACTIVE)) {
00076         timer_set(&debouncetimer, 0);
00077         BUTTON_IRQ_EDGE_SELECTD();
00078 
00079         BUTTON_SELECT();
00080         BUTTON_MAKE_INPUT();
00081 
00082         BUTTON_ENABLE_IRQ();
00083       }
00084     } else {
00085       BUTTON_DISABLE_IRQ();
00086     }
00087     return 1;
00088   }
00089   return 0;
00090 }
00091 /*---------------------------------------------------------------------------*/
00092 static int
00093 status(int type)
00094 {
00095   switch (type) {
00096   case SENSORS_ACTIVE:
00097   case SENSORS_READY:
00098     return BUTTON_IRQ_ENABLED();
00099   }
00100   return 0;
00101 }
00102 /*---------------------------------------------------------------------------*/
00103 SENSORS_SENSOR(button_sensor, BUTTON_SENSOR,
00104                value, configure, status);

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