Contiki 2.6

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 1.2 2010/08/26 16:01:20 joxe Exp $
00032  */
00033 
00034 #include "contiki.h"
00035 #include "lib/sensors.h"
00036 #include "dev/hwconf.h"
00037 #include "dev/button-sensor.h"
00038 #include "isr_compat.h"
00039 
00040 const struct sensors_sensor button_sensor;
00041 
00042 static struct timer debouncetimer;
00043 static int status(int type);
00044 
00045 HWCONF_PIN(BUTTON, 2, 5);
00046 HWCONF_IRQ(BUTTON, 2, 5);
00047 
00048 /*---------------------------------------------------------------------------*/
00049 ISR(PORT2, irq_p2)
00050 {
00051   ENERGEST_ON(ENERGEST_TYPE_IRQ);
00052 
00053   if(BUTTON_CHECK_IRQ()) {
00054     if(timer_expired(&debouncetimer)) {
00055       timer_set(&debouncetimer, CLOCK_SECOND / 4);
00056       sensors_changed(&button_sensor);
00057       LPM4_EXIT;
00058     }
00059   }
00060   P2IFG = 0x00;
00061   ENERGEST_OFF(ENERGEST_TYPE_IRQ);
00062 }
00063 /*---------------------------------------------------------------------------*/
00064 static int
00065 value(int type)
00066 {
00067   return BUTTON_READ() || !timer_expired(&debouncetimer);
00068 }
00069 /*---------------------------------------------------------------------------*/
00070 static int
00071 configure(int type, int c)
00072 {
00073   switch (type) {
00074   case SENSORS_ACTIVE:
00075     if (c) {
00076       if(!status(SENSORS_ACTIVE)) {
00077         timer_set(&debouncetimer, 0);
00078         BUTTON_IRQ_EDGE_SELECTD();
00079 
00080         BUTTON_SELECT();
00081         BUTTON_MAKE_INPUT();
00082 
00083         BUTTON_ENABLE_IRQ();
00084       }
00085     } else {
00086       BUTTON_DISABLE_IRQ();
00087     }
00088     return 1;
00089   }
00090   return 0;
00091 }
00092 /*---------------------------------------------------------------------------*/
00093 static int
00094 status(int type)
00095 {
00096   switch (type) {
00097   case SENSORS_ACTIVE:
00098   case SENSORS_READY:
00099     return BUTTON_IRQ_ENABLED();
00100   }
00101   return 0;
00102 }
00103 /*---------------------------------------------------------------------------*/
00104 SENSORS_SENSOR(button_sensor, BUTTON_SENSOR,
00105                value, configure, status);