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