button-sensor.c

00001 /*
00002  * Copyright (c) 2010, Mariano Alvira <mar@devl.org> and other contributors
00003  * to the MC1322x project (http://mc1322x.devl.org) and Contiki.
00004  *
00005  * All rights reserved.
00006  *
00007  * Redistribution and use in source and binary forms, with or without
00008  * modification, are permitted provided that the following conditions
00009  * are met:
00010  * 1. Redistributions of source code must retain the above copyright
00011  *    notice, this list of conditions and the following disclaimer.
00012  * 2. Redistributions in binary form must reproduce the above copyright
00013  *    notice, this list of conditions and the following disclaimer in the
00014  *    documentation and/or other materials provided with the distribution.
00015  * 3. Neither the name of the Institute nor the names of its contributors
00016  *    may be used to endorse or promote products derived from this software
00017  *    without specific prior written permission.
00018  *
00019  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
00020  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00021  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00022  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
00023  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00024  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
00025  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00026  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
00027  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
00028  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00029  * SUCH DAMAGE.
00030  *
00031  * This file is part of the Contiki OS.
00032  *
00033  * $Id: button-sensor.c,v 1.1 2010/06/09 14:46:30 maralvira Exp $
00034  */
00035 
00036 #include "lib/sensors.h"
00037 #include "dev/button-sensor.h"
00038 
00039 #include "mc1322x.h"
00040 
00041 #include <signal.h>
00042 
00043 const struct sensors_sensor button_sensor;
00044 
00045 static struct timer debouncetimer;
00046 static int status(int type);
00047 
00048 void kbi4_isr(void) {
00049         if(timer_expired(&debouncetimer)) {
00050                 timer_set(&debouncetimer, CLOCK_SECOND / 4);
00051                 sensors_changed(&button_sensor);
00052         }
00053         clear_kbi_evnt(4);
00054 }
00055 
00056 static int
00057 value(int type)
00058 {
00059         return GPIO->DATA.GPIO_26 || !timer_expired(&debouncetimer);
00060 }
00061 
00062 static int
00063 configure(int type, int c)
00064 {
00065         switch (type) {
00066         case SENSORS_ACTIVE:
00067                 if (c) {
00068                         if(!status(SENSORS_ACTIVE)) {
00069                                 timer_set(&debouncetimer, 0);
00070                                 enable_irq_kbi(4);
00071                         }
00072                 } else {
00073                         disable_irq_kbi(4);
00074                 }
00075                 return 1;
00076         }
00077         return 0;
00078 }
00079 
00080 static int
00081 status(int type)
00082 {
00083         switch (type) {
00084         case SENSORS_ACTIVE:
00085         case SENSORS_READY:
00086                 return bit_is_set(*CRM_WU_CNTL, 20); /* check if kbi4 irq is enabled */
00087         }
00088         return 0;
00089 }
00090 
00091 SENSORS_SENSOR(button_sensor, BUTTON_SENSOR,
00092                value, configure, status);

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