Contiki-NG
rtimer-arch.c
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1 /*
2  * Copyright (c) 2011, 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  * \file
34  * MSP430-specific rtimer code for MSP430X
35  * \author
36  * Adam Dunkels <adam@sics.se>
37  */
38 
39 #include "contiki.h"
40 #include "sys/rtimer.h"
41 #include "sys/process.h"
42 #include "dev/watchdog.h"
43 #include "isr_compat.h"
44 
45 #define DEBUG 0
46 #if DEBUG
47 #include <stdio.h>
48 #define PRINTF(...) printf(__VA_ARGS__)
49 #else
50 #define PRINTF(...)
51 #endif
52 
53 /*---------------------------------------------------------------------------*/
54 ISR(TIMER1_A0, timera0)
55 {
57 
59 
60  if(process_nevents() > 0) {
61  LPM4_EXIT;
62  }
63 
64  watchdog_stop();
65 }
66 /*---------------------------------------------------------------------------*/
67 void
69 {
70  dint();
71 
72  /* CCR0 interrupt enabled, interrupt occurs when timer equals CCR0. */
73  TA1CCTL0 = CCIE;
74 
75  /* Enable interrupts. */
76  eint();
77 }
78 /*---------------------------------------------------------------------------*/
79 rtimer_clock_t
81 {
82  rtimer_clock_t t1, t2;
83  do {
84  t1 = TA1R;
85  t2 = TA1R;
86  } while(t1 != t2);
87  return t1;
88 }
89 /*---------------------------------------------------------------------------*/
90 void
91 rtimer_arch_schedule(rtimer_clock_t t)
92 {
93  PRINTF("rtimer_arch_schedule time %u\n", t);
94 
95  TA1CCR0 = t;
96 }
97 /*---------------------------------------------------------------------------*/
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.