topic Re: stuck in WD interrupt in LPCXpresso IDE

stuck in WD interrupt

lpcware — Thu, 16 Jun 2016 01:40:57 GMT

Content originally posted in LPCWare by 12345 on Mon Jul 11 20:30:57 MST 2011
Program stuck in WD interrupt handler!
How can I jump out from the WD interrupt handler?

void WDTInit( void )
{
LPC_SYSCON->SYSAHBCLKCTRL |= (1<<15);

wdt_counter = 0;

/* Enable the WDT Interrupt */
NVIC_EnableIRQ(WDT_IRQn);

LPC_WDT->TC = WDT_FEED_VALUE;//timer constant register 1.576Sec /* once WDEN is set, the WDT will start after feeding */
LPC_WDT->MOD=0x00;
LPC_WDT->MOD=WDEN;

LPC_WDT->FEED = 0xAA;/* Feeding sequence */
LPC_WDT->FEED = 0x55;

return;
}

void WDT_IRQHandler(void)
{

//UARTSendOne(0x13);
if (LoadCG==0)
{
NVIC_SystemReset();
}

   NVIC_DisableIRQ(WDT_IRQn);// Disable the watchdog- interrupt flag cannot
// be cleared except by reset

   LPC_WDT->MOD &= ~WDTOF;/* clear the time-out interrupt flag */
                                //reset to zero watchdog timeout flag//
   LPC_WDT->MOD &= ~WDINT;/* clear the time-out flag and interrupt flag */
   //wdt_counter++;
   LPC_WDT->FEED = 0xAA;/* Feeding sequence */
   LPC_WDT->FEED = 0x55;
   //WDTFeed();

}

Re: stuck in WD interrupt

lpcware — Thu, 16 Jun 2016 01:40:58 GMT

Content originally posted in LPCWare by Ex-Zero on Tue Jul 12 04:20:45 MST 2011

Quote: 12345
Program stuck in WD interrupt handler!
How can I jump out from the WD interrupt handler?

1. Start with standard:
[INDENT]

/*****************************************************************************
** Function name:        WDTHandler
**
** Descriptions:        Watchdog timer interrupt handler
**
** parameters:            None
** Returned value:        None
** 
*****************************************************************************/
void WDT_IRQHandler(void)
{
  LPC_WDT->MOD &= ~WDTOF;        /* clear the time-out interrupt flag */
  wdt_counter++;
}

[/INDENT]2. Avoid nonsense like:
[INDENT]

LPC_WDT->MOD=0x00;
LPC_WDT->MOD=WDEN;

[/INDENT]and
[INDENT]

LPC_WDT->MOD &= ~WDINT; /* clear the time-out flag and interrupt flag */

[/INDENT]

Re: stuck in WD interrupt

lpcware — Thu, 16 Jun 2016 01:40:59 GMT

Content originally posted in LPCWare by NXP_USA on Tue Jul 12 15:23:39 MST 2011
The watchdog interrupt flag cannot be cleared once it has timed out, so the interrupt will continue to be called repeatedly.

Re: stuck in WD interrupt

lpcware — Thu, 16 Jun 2016 01:41:00 GMT

Content originally posted in LPCWare by martinho on Tue Jul 12 22:45:12 MST 2011

Quote: NXP_USA
The watchdog interrupt flag cannot be cleared once it has timed out, so the interrupt will continue to be called repeatedly.

But you can disable the WDT Interrupt in the NVIC.

By the way the WDT Interrupt mode is only there for debugging the watchdog behavior of you code. If you need a periodical interrupt use one of the timers!