Contiki 2.6
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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.c,v 1.2 2006/08/17 15:41:13 bg- Exp $ 00030 */ 00031 00032 #include "contiki.h" 00033 #include "dev/button.h" 00034 #include "isr_compat.h" 00035 00036 #define BUTTON_PORT 2 00037 #define BUTTON_PIN 7 00038 00039 static struct button_msg button_msg; 00040 00041 static struct process *selecting_proc; 00042 00043 void 00044 button_init(struct process *proc) 00045 { 00046 button_msg.type = BUTTON_MSG_TYPE; 00047 00048 P2DIR &= ~BV(BUTTON_PIN); 00049 P2SEL &= ~BV(BUTTON_PIN); 00050 00051 P2IES |= BV(BUTTON_PIN); 00052 P2IFG &= ~BV(BUTTON_PIN); 00053 00054 selecting_proc = proc; 00055 if(proc != NULL) 00056 P2IE |= BV(BUTTON_PIN); 00057 else 00058 P2IE &= ~BV(BUTTON_PIN); 00059 } 00060 00061 ISR(PORT2, __button_interrupt) 00062 { 00063 static struct timer debouncetimer; 00064 00065 P2IFG &= ~BV(BUTTON_PIN); 00066 if(timer_expired(&debouncetimer)) { 00067 button_msg.value = P2IN & BV(BUTTON_PIN); 00068 timer_set(&debouncetimer, CLOCK_SECOND/4); 00069 if(selecting_proc != NULL) { 00070 process_post(selecting_proc, PROCESS_EVENT_MSG, &button_msg); 00071 } 00072 LPM4_EXIT; 00073 } 00074 }