Contiki-NG
rtimer-arch.c
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1 /*
2  * Copyright (c) 2007, Swedish Institute of Computer Science.
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  * notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  * notice, this list of conditions and the following disclaimer in the
12  * documentation and/or other materials provided with the distribution.
13  * 3. Neither the name of the Institute nor the names of its contributors
14  * may be used to endorse or promote products derived from this software
15  * without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  *
29  * This file is part of the Contiki operating system.
30  *
31  */
32 
33 /**
34  * \file
35  * MSP430-specific rtimer code
36  * \author
37  * Adam Dunkels <adam@sics.se>
38  */
39 
40 #include "contiki.h"
41 
42 #include "sys/rtimer.h"
43 #include "sys/process.h"
44 #include "dev/watchdog.h"
45 #include "isr_compat.h"
46 
47 #define DEBUG 0
48 #if DEBUG
49 #include <stdio.h>
50 #define PRINTF(...) printf(__VA_ARGS__)
51 #else
52 #define PRINTF(...)
53 #endif
54 
55 /*---------------------------------------------------------------------------*/
56 ISR(TIMERA0, timera0)
57 {
59 
61 
62  if(process_nevents() > 0) {
63  LPM4_EXIT;
64  }
65 
66  watchdog_stop();
67 }
68 /*---------------------------------------------------------------------------*/
69 void
71 {
72  dint();
73 
74  /* CCR0 interrupt enabled, interrupt occurs when timer equals CCR0. */
75  TACCTL0 = CCIE;
76 
77  /* Enable interrupts. */
78  eint();
79 }
80 /*---------------------------------------------------------------------------*/
81 rtimer_clock_t
83 {
84  rtimer_clock_t t1, t2;
85  do {
86  t1 = TAR;
87  t2 = TAR;
88  } while(t1 != t2);
89  return t1;
90 }
91 /*---------------------------------------------------------------------------*/
92 void
93 rtimer_arch_schedule(rtimer_clock_t t)
94 {
95  PRINTF("rtimer_arch_schedule time %u\n", t);
96 
97  TACCR0 = t;
98 }
99 /*---------------------------------------------------------------------------*/
rtimer_clock_t rtimer_arch_now()
Returns the current real-time clock time.
Definition: rtimer-arch.c:115
void rtimer_arch_schedule(rtimer_clock_t t)
Schedules an rtimer task to be triggered at time t.
Definition: rtimer-arch.c:71
void rtimer_arch_init(void)
We don&#39;t need to explicitly initialise anything but this routine is required by the API...
Definition: rtimer-arch.c:59
void rtimer_run_next(void)
Execute the next real-time task and schedule the next task, if any.
Definition: rtimer.c:92
void watchdog_start(void)
Starts the WDT in watchdog mode if enabled by user configuration, maximum interval.
Definition: watchdog.c:72
Header file for the real-time timer module.
Header file for the Contiki process interface.
int process_nevents(void)
Number of events waiting to be processed.
Definition: process.c:316
void watchdog_stop(void)
Stops the WDT such that it won&#39;t timeout and cause MCU reset.