Contiki 2.6

button-sensor.c

00001 /*
00002  * Copyright (c) 2011, 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 #include "lib/sensors.h"
00032 #include "dev/hwconf.h"
00033 #include "dev/button-sensor.h"
00034 #include "isr_compat.h"
00035 
00036 const struct sensors_sensor button_sensor;
00037 
00038 static struct timer debouncetimer;
00039 static int status(int type);
00040 
00041 HWCONF_PIN(BUTTON, 2, 7);
00042 HWCONF_IRQ(BUTTON, 2, 7);
00043 
00044 /*---------------------------------------------------------------------------*/
00045 ISR(PORT2, irq_p2)
00046 {
00047   ENERGEST_ON(ENERGEST_TYPE_IRQ);
00048 
00049   if(BUTTON_CHECK_IRQ() && timer_expired(&debouncetimer)) {
00050     timer_set(&debouncetimer, CLOCK_SECOND / 4);
00051     sensors_changed(&button_sensor);
00052     LPM4_EXIT;
00053   }
00054   P2IFG = 0x00;
00055   ENERGEST_OFF(ENERGEST_TYPE_IRQ);
00056 }
00057 /*---------------------------------------------------------------------------*/
00058 static int
00059 value(int type)
00060 {
00061   return BUTTON_READ() || !timer_expired(&debouncetimer);
00062 }
00063 /*---------------------------------------------------------------------------*/
00064 static int
00065 configure(int type, int value)
00066 {
00067   if(type == SENSORS_ACTIVE) {
00068     if(value == 0) {
00069       /* Deactivate button sensor */
00070       BUTTON_DISABLE_IRQ();
00071     } else {
00072       /* Activate button sensor */
00073       if(!status(SENSORS_ACTIVE)) {
00074         timer_set(&debouncetimer, 0);
00075         BUTTON_IRQ_EDGE_SELECTD();
00076 
00077         BUTTON_SELECT();
00078         BUTTON_MAKE_INPUT();
00079 
00080         BUTTON_ENABLE_IRQ();
00081       }
00082     }
00083     return 1;
00084   }
00085   return 0;
00086 }
00087 /*---------------------------------------------------------------------------*/
00088 static int
00089 status(int type)
00090 {
00091   switch(type) {
00092   case SENSORS_ACTIVE:
00093   case SENSORS_READY:
00094     return BUTTON_IRQ_ENABLED();
00095   default:
00096     return 0;
00097   }
00098 }
00099 /*---------------------------------------------------------------------------*/
00100 SENSORS_SENSOR(button_sensor, BUTTON_SENSOR,
00101                value, configure, status);