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 1.12  2007/06/07 14:35:12  batt
  18  *#* Merge from project_ks.
  19  *#*
  20  *#* Revision 1.11  2006/07/19 12:56:26  bernie
  21  *#* Convert to new Doxygen style.
  22  *#*
  23  *#* Revision 1.10  2006/05/18 00:38:42  bernie
  24  *#* Work around missing ARCH_FREERTOS symbol.
  25  *#*
  26  *#* Revision 1.9  2006/03/22 09:49:09  bernie
  27  *#* Add FreeRTOS support.
  28  *#*
  29  *#* Revision 1.8  2006/02/20 02:02:29  bernie
  30  *#* Port to Qt 4.1.
  31  *#*
  32  *#* Revision 1.7  2005/11/27 03:58:40  bernie
  33  *#* Add POSIX timer emulator.
  34  *#*
  35  *#* Revision 1.6  2005/11/27 03:03:08  bernie
  36  *#* Add Qt support hack.
  37  *#*
  38  *#* Revision 1.5  2005/11/04 16:20:02  bernie
  39  *#* Fix reference to README.devlib in header.
  40  *#*
  41  *#* Revision 1.4  2005/04/12 01:37:17  bernie
  42  *#* Prevent warning when watchdog is disabled.
  43  *#*
  44  *#* Revision 1.3  2005/04/11 19:10:28  bernie
  45  *#* Include top-level headers from cfg/ subdir.
  46  *#*
  47  *#* Revision 1.2  2004/11/16 21:02:07  bernie
  48  *#* Make driver optional; mark AVR specific parts as such.
  49  *#*
  50  *#* Revision 1.1  2004/10/26 08:34:47  bernie
  51  *#* New DevLib module.
  52  *#*
  53  *#*/
  54 #ifndef DRV_WDT_H
  55 #define DRV_WDT_H
  56
  57 #include <appconfig.h>
  58 #include <cfg/compiler.h> // INLINE
  59 #include <cfg/arch_config.h>
  60
  61 /* Configury sanity check */
  62 #if !defined(CONFIG_WATCHDOG) || (CONFIG_WATCHDOG != 0 && CONFIG_WATCHDOG != 1)
  63         #error CONFIG_WATCHDOG must be defined to either 0 or 1
  64 #endif
  65
  66 #if CONFIG_WATCHDOG
  67         #include <cfg/cpu.h>
  68         #include <cfg/os.h>
  69
  70         #if OS_QT
  71                 #if _QT < 4
  72                         #include <qapplication.h>
  73                 #else
  74                         #include <QtGui/QApplication>
  75                 #endif
  76         #elif OS_POSIX
  77                 #include <sys/select.h>
  78         #elif CPU_AVR
  79                 #include <avr/io.h>
  80                 #include <cfg/macros.h> // BV()
  81                 #if CPU_AVR_ATMEGA1281  // Name is different in atmega1281
  82                         #define WDTCR WDTCSR
  83                 #endif
  84         #elif defined(ARCH_FREERTOS) && (ARCH & ARCH_FREERTOS)
  85                 #include <task.h> /* taskYIELD() */
  86         #else
  87                 #error unknown CPU
  88         #endif
  89 #endif /* CONFIG_WATCHDOG */
  90
  91 /**
  92  * Reset the watchdog timer.
  93  */
  94 INLINE void wdt_reset(void)
  95 {
  96 #if CONFIG_WATCHDOG
  97         #if OS_QT
  98                 // Let Qt handle events
  99                 ASSERT(qApp);
 100                 qApp->processEvents();
 101         #elif OS_POSIX
 102                 static struct timeval tv = { 0, 0 };
 103                 select(0, NULL, NULL, NULL, &tv);
 104         #elif defined(ARCH_FREERTOS) && (ARCH & ARCH_FREERTOS)
 105                 vTaskDelay(1);
 106         #elif CPU_AVR
 107                 __asm__ __volatile__ ("wdr");
 108         #else
 109                 #error unknown CPU
 110         #endif
 111 #endif /* CONFIG_WATCHDOG */
 112 }
 113
 114 /**
 115  * Set watchdog timer timeout.
 116  *
 117  * \param timeout  0: 16.3ms, 7: 2.1s
 118  */
 119 INLINE void wdt_init(uint8_t timeout)
 120 {
 121 #if CONFIG_WATCHDOG
 122         #if OS_QT
 123                 // Create a dummy QApplication object
 124                 if (!qApp)
 125                 {
 126                         int argc;
 127                         new QApplication(argc, (char **)NULL);
 128                 }
 129                 (void)timeout;
 130         #elif OS_POSIX
 131                 (void)timeout; // NOP
 132         #elif defined(ARCH_FREERTOS) && (ARCH & ARCH_FREERTOS)
 133                 /* nop */
 134         #elif CPU_AVR
 135                 WDTCR |= BV(WDCE) | BV(WDE);
 136                 WDTCR = timeout;
 137         #else
 138                 #error unknown CPU
 139         #endif
 140 #else
 141         (void)timeout;
 142 #endif /* CONFIG_WATCHDOG */
 143 }
 144
 145 INLINE void wdt_start(void)
 146 {
 147 #if CONFIG_WATCHDOG
 148         #if OS_QT
 149                 // NOP
 150         #elif OS_POSIX
 151                 // NOP
 152         #elif defined(ARCH_FREERTOS) && (ARCH & ARCH_FREERTOS)
 153                 /* nop */
 154         #elif CPU_AVR
 155                 WDTCR |= BV(WDE);
 156         #else
 157                 #error unknown CPU
 158         #endif
 159 #endif /* CONFIG_WATCHDOG */
 160 }
 161
 162 INLINE void wdt_stop(void)
 163 {
 164 #if CONFIG_WATCHDOG
 165         #if OS_QT
 166                 // NOP
 167         #elif OS_POSIX
 168                 // NOP
 169         #elif defined(ARCH_FREERTOS) && (ARCH & ARCH_FREERTOS)
 170                 /* nop */
 171         #elif CPU_AVR
 172                 WDTCR |= BV(WDCE) | BV(WDE);
 173                 WDTCR &= ~BV(WDE);
 174         #else
 175                 #error unknown CPU
 176         #endif
 177 #endif /* CONFIG_WATCHDOG */
 178 }
 179
 180 #endif /* DRV_WDT_H */