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 1.8  2006/02/20 02:02:29  bernie
  18  *#* Port to Qt 4.1.
  19  *#*
  20  *#* Revision 1.7  2005/11/27 03:58:40  bernie
  21  *#* Add POSIX timer emulator.
  22  *#*
  23  *#* Revision 1.6  2005/11/27 03:03:08  bernie
  24  *#* Add Qt support hack.
  25  *#*
  26  *#* Revision 1.5  2005/11/04 16:20:02  bernie
  27  *#* Fix reference to README.devlib in header.
  28  *#*
  29  *#* Revision 1.4  2005/04/12 01:37:17  bernie
  30  *#* Prevent warning when watchdog is disabled.
  31  *#*
  32  *#* Revision 1.3  2005/04/11 19:10:28  bernie
  33  *#* Include top-level headers from cfg/ subdir.
  34  *#*
  35  *#* Revision 1.2  2004/11/16 21:02:07  bernie
  36  *#* Make driver optional; mark AVR specific parts as such.
  37  *#*
  38  *#* Revision 1.1  2004/10/26 08:34:47  bernie
  39  *#* New DevLib module.
  40  *#*
  41  *#*/
  42 #ifndef DRV_WDT_H
  43 #define DRV_WDT_H
  44
  45 #include <appconfig.h>
  46 #include <cfg/compiler.h> // INLINE
  47
  48 /* Configury sanity check */
  49 #if !defined(CONFIG_WATCHDOG) || (CONFIG_WATCHDOG != 0 && CONFIG_WATCHDOG != 1)
  50         #error CONFIG_WATCHDOG must be defined to either 0 or 1
  51 #endif
  52
  53 #if CONFIG_WATCHDOG
  54         #include <cfg/cpu.h>
  55         #include <cfg/os.h>
  56
  57         #if OS_QT
  58                 #if _QT < 4
  59                         #include <qapplication.h>
  60                 #else
  61                         #include <QtGui/QApplication>
  62                 #endif
  63         #elif OS_POSIX
  64                 #include <sys/select.h>
  65         #elif CPU_AVR
  66                 #include <avr/io.h>
  67                 #include <cfg/macros.h> // BV()
  68         #else
  69                 #error unknown CPU
  70         #endif
  71 #endif /* CONFIG_WATCHDOG */
  72
  73 /*!
  74  * Reset the watchdog timer.
  75  */
  76 INLINE void wdt_reset(void)
  77 {
  78 #if CONFIG_WATCHDOG
  79         #if OS_QT
  80                 // Let Qt handle events
  81                 ASSERT(qApp);
  82                 qApp->processEvents();
  83         #elif OS_POSIX
  84                 static struct timeval tv = { 0, 0 };
  85                 select(0, NULL, NULL, NULL, &tv);
  86         #elif CPU_AVR
  87                 __asm__ __volatile__ ("wdr");
  88         #else
  89                 #error unknown CPU
  90         #endif
  91 #endif /* CONFIG_WATCHDOG */
  92 }
  93
  94 /*!
  95  * Set watchdog timer timeout.
  96  *
  97  * \param timeout  0: 16.3ms, 7: 2.1s
  98  */
  99 INLINE void wdt_init(uint8_t timeout)
 100 {
 101 #if CONFIG_WATCHDOG
 102         #if OS_QT
 103                 // Create a dummy QApplication object
 104                 if (!qApp)
 105                 {
 106                         int argc;
 107                         new QApplication(argc, (char **)NULL);
 108                 }
 109                 (void)timeout;
 110         #elif OS_POSIX
 111                 (void)timeout; // NOP
 112         #elif CPU_AVR
 113                 WDTCR |= BV(WDCE) | BV(WDE);
 114                 WDTCR = timeout;
 115         #else
 116                 #error unknown CPU
 117         #endif
 118 #else
 119         (void)timeout;
 120 #endif /* CONFIG_WATCHDOG */
 121 }
 122
 123 INLINE void wdt_start(void)
 124 {
 125 #if CONFIG_WATCHDOG
 126         #if OS_QT
 127                 // NOP
 128         #elif OS_POSIX
 129                 // NOP
 130         #elif CPU_AVR
 131                 WDTCR |= BV(WDE);
 132         #else
 133                 #error unknown CPU
 134         #endif
 135 #endif /* CONFIG_WATCHDOG */
 136 }
 137
 138 INLINE void wdt_stop(void)
 139 {
 140 #if CONFIG_WATCHDOG
 141         #if OS_QT
 142                 // NOP
 143         #elif OS_POSIX
 144                 // NOP
 145         #elif CPU_AVR
 146                 WDTCR |= BV(WDCE) | BV(WDE);
 147                 WDTCR &= ~BV(WDE);
 148         #else
 149                 #error unknown CPU
 150         #endif
 151 #endif /* CONFIG_WATCHDOG */
 152 }
 153
 154 #endif /* DRV_WDT_H */