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