Picproje Elektronik Sitesi

Alıntı yapılan: armsistem - 16 Mayıs 2013, 00:09:56
Arkadaşlar merhaba ; aşağıda wdt ile bir örnek var , anlayamadığım verilen süre sonrasında oluşan kesmede işlemci soft olarak resetleniyor mu ?
- WDT kullanmadan soft. olarak nasıl işlemciyi resetlerim.

Kod Seç Genişlet


/*****************************************************************************
*   wdt.c:  Watchdog C file for NXP LPC23xx/24xx Family Microprocessors
*
*   Copyright(C) 2006, NXP Semiconductor
*   All rights reserved.
*
*   History
*   2006.07.20  ver 1.00    Prelimnary version, first Release
*
*****************************************************************************/
#include "LPC23xx.h"                        /* LPC23xx/24xx definitions */
#include "type.h"
#include "irq.h"
#include "timer.h"
#include "wdt.h"

volatile DWORD wdt_counter;

/*****************************************************************************
** Function name: WDTHandler
**
** Descriptions: Watchdog timer interrupt handler
**
** parameters: None
** Returned value: None
**
*****************************************************************************/
void WDTHandler(void) __irq
{
  WDMOD &= ~WDTOF; /* clear the time-out terrupt flag */  
  IENABLE; /* handles nested interrupt */
  wdt_counter++;
  IDISABLE;
  VICVectAddr = 0; /* Acknowledge Interrupt */
}

/*****************************************************************************
** Function name: WDTInit
**
** Descriptions: Initialize watchdog timer, install the
** watchdog timer interrupt handler
**
** parameters: None
** Returned value: true or false, return false if the VIC table
** is full and WDT interrupt handler can be
** installed.
**
*****************************************************************************/
DWORD WDTInit( void )
{
  wdt_counter = 0;
  if ( install_irq( WDT_INT, (void *)WDTHandler, HIGHEST_PRIORITY ) == FALSE )
  {
return (FALSE);
  }

  WDTC = WDT_FEED_VALUE; /* once WDEN is set, the WDT will start after feeding */
//  WDMOD = WDEN | WDRESET;
  WDMOD = WDEN;

  WDFEED = 0xAA; /* Feeding sequence */
  WDFEED = 0x55;   
  return( TRUE );
}

/*****************************************************************************
** Function name: WDTFeed
**
** Descriptions: Feed watchdog timer to prevent it from timeout
**
** parameters: None
** Returned value: None
**
*****************************************************************************/
void WDTFeed( void )
{
  WDFEED = 0xAA; /* Feeding sequence */
  WDFEED = 0x55;
  return;
}

/******************************************************************************
**                            End Of File
******************************************************************************/