drv/wdt.h

   1 /**
   2  * \file
   3  * <!--
   4  * Copyright 2004 Develer S.r.l. (http://www.develer.com/)
   5  * This file is part of DevLib - See README.devlib for information.
   6  * -->
   7  *
   8  * \version $Id$
   9  *
  10  * \author Bernardo Innocenti <bernie@develer.com>
  11  *
  12  * \brief Watchdog interface
  13  */
  14
  15 /*#*
  16  *#* $Log$
  17  *#* Revision 1.11  2006/07/19 12:56:26  bernie
  18  *#* Convert to new Doxygen style.
  19  *#*
  20  *#* Revision 1.10  2006/05/18 00:38:42  bernie
  21  *#* Work around missing ARCH_FREERTOS symbol.
  22  *#*
  23  *#* Revision 1.9  2006/03/22 09:49:09  bernie
  24  *#* Add FreeRTOS support.
  25  *#*
  26  *#* Revision 1.8  2006/02/20 02:02:29  bernie
  27  *#* Port to Qt 4.1.
  28  *#*
  29  *#* Revision 1.7  2005/11/27 03:58:40  bernie
  30  *#* Add POSIX timer emulator.
  31  *#*
  32  *#* Revision 1.6  2005/11/27 03:03:08  bernie
  33  *#* Add Qt support hack.
  34  *#*
  35  *#* Revision 1.5  2005/11/04 16:20:02  bernie
  36  *#* Fix reference to README.devlib in header.
  37  *#*
  38  *#* Revision 1.4  2005/04/12 01:37:17  bernie
  39  *#* Prevent warning when watchdog is disabled.
  40  *#*
  41  *#* Revision 1.3  2005/04/11 19:10:28  bernie
  42  *#* Include top-level headers from cfg/ subdir.
  43  *#*
  44  *#* Revision 1.2  2004/11/16 21:02:07  bernie
  45  *#* Make driver optional; mark AVR specific parts as such.
  46  *#*
  47  *#* Revision 1.1  2004/10/26 08:34:47  bernie
  48  *#* New DevLib module.
  49  *#*
  50  *#*/
  51 #ifndef DRV_WDT_H
  52 #define DRV_WDT_H
  53
  54 #include <appconfig.h>
  55 #include <cfg/compiler.h> // INLINE
  56 #include <cfg/arch_config.h>
  57
  58 /* Configury sanity check */
  59 #if !defined(CONFIG_WATCHDOG) || (CONFIG_WATCHDOG != 0 && CONFIG_WATCHDOG != 1)
  60         #error CONFIG_WATCHDOG must be defined to either 0 or 1
  61 #endif
  62
  63 #if CONFIG_WATCHDOG
  64         #include <cfg/cpu.h>
  65         #include <cfg/os.h>
  66
  67         #if OS_QT
  68                 #if _QT < 4
  69                         #include <qapplication.h>
  70                 #else
  71                         #include <QtGui/QApplication>
  72                 #endif
  73         #elif OS_POSIX
  74                 #include <sys/select.h>
  75         #elif CPU_AVR
  76                 #include <avr/io.h>
  77                 #include <cfg/macros.h> // BV()
  78         #elif defined(ARCH_FREERTOS) && (ARCH & ARCH_FREERTOS)
  79                 #include <task.h> /* taskYIELD() */
  80         #else
  81                 #error unknown CPU
  82         #endif
  83 #endif /* CONFIG_WATCHDOG */
  84
  85 /**
  86  * Reset the watchdog timer.
  87  */
  88 INLINE void wdt_reset(void)
  89 {
  90 #if CONFIG_WATCHDOG
  91         #if OS_QT
  92                 // Let Qt handle events
  93                 ASSERT(qApp);
  94                 qApp->processEvents();
  95         #elif OS_POSIX
  96                 static struct timeval tv = { 0, 0 };
  97                 select(0, NULL, NULL, NULL, &tv);
  98         #elif defined(ARCH_FREERTOS) && (ARCH & ARCH_FREERTOS)
  99                 vTaskDelay(1);
 100         #elif CPU_AVR
 101                 __asm__ __volatile__ ("wdr");
 102         #else
 103                 #error unknown CPU
 104         #endif
 105 #endif /* CONFIG_WATCHDOG */
 106 }
 107
 108 /**
 109  * Set watchdog timer timeout.
 110  *
 111  * \param timeout  0: 16.3ms, 7: 2.1s
 112  */
 113 INLINE void wdt_init(uint8_t timeout)
 114 {
 115 #if CONFIG_WATCHDOG
 116         #if OS_QT
 117                 // Create a dummy QApplication object
 118                 if (!qApp)
 119                 {
 120                         int argc;
 121                         new QApplication(argc, (char **)NULL);
 122                 }
 123                 (void)timeout;
 124         #elif OS_POSIX
 125                 (void)timeout; // NOP
 126         #elif defined(ARCH_FREERTOS) && (ARCH & ARCH_FREERTOS)
 127                 /* nop */
 128         #elif CPU_AVR
 129                 WDTCR |= BV(WDCE) | BV(WDE);
 130                 WDTCR = timeout;
 131         #else
 132                 #error unknown CPU
 133         #endif
 134 #else
 135         (void)timeout;
 136 #endif /* CONFIG_WATCHDOG */
 137 }
 138
 139 INLINE void wdt_start(void)
 140 {
 141 #if CONFIG_WATCHDOG
 142         #if OS_QT
 143                 // NOP
 144         #elif OS_POSIX
 145                 // NOP
 146         #elif defined(ARCH_FREERTOS) && (ARCH & ARCH_FREERTOS)
 147                 /* nop */
 148         #elif CPU_AVR
 149                 WDTCR |= BV(WDE);
 150         #else
 151                 #error unknown CPU
 152         #endif
 153 #endif /* CONFIG_WATCHDOG */
 154 }
 155
 156 INLINE void wdt_stop(void)
 157 {
 158 #if CONFIG_WATCHDOG
 159         #if OS_QT
 160                 // NOP
 161         #elif OS_POSIX
 162                 // NOP
 163         #elif defined(ARCH_FREERTOS) && (ARCH & ARCH_FREERTOS)
 164                 /* nop */
 165         #elif CPU_AVR
 166                 WDTCR |= BV(WDCE) | BV(WDE);
 167                 WDTCR &= ~BV(WDE);
 168         #else
 169                 #error unknown CPU
 170         #endif
 171 #endif /* CONFIG_WATCHDOG */
 172 }
 173
 174 #endif /* DRV_WDT_H */