I am developing an application with STR750 and I use the watchdog timer in watchdog mode.
I have to fix a watchdog issue and find where my application code in some working conditions stops refreshing the watchdog timer.
So I changed the watchdog in timer mode, in order to get a FIQ interrupt when that issue occurs.
The following is my code:
void WDG_Configuration(void)
{
WDG_InitTypeDef WDG_InitStructure;
EIC_FIQInitTypeDef EIC_FIQInitStructure;

WDG_DeInit();
/* Configure the WDG to generate a FIQ interrupt */
WDG_InitStructure.WDG_Mode = WDG_Mode_Timer;
WDG_InitStructure.WDG_Preload = 0xFFFF;
WDG_InitStructure.WDG_Prescaler = 0xFF;
WDG_Init(ampWDG_InitStructure);
/* Enable the WDG */
WDG_Cmd(ENABLE);

WDG_ClearITPendingBit();
/* Enables the WDG End of Count(EC) interrupt */
WDG_ITConfig(ENABLE);

EIC_FIQInitStructure.EIC_FIQChannel = WATCHDOG_FIQChannel;
EIC_FIQInitStructure.EIC_FIQChannelCmd = ENABLE;
EIC_FIQInit(ampEIC_FIQInitStructure);
EIC_ClearFIQPendingBit(WATCHDOG_FIQChannel);
/* Enable the Interrupt controller to manage FIQ channel*/
EIC_FIQCmd(ENABLE);
}
void WdogRefresh( void )
{
WDG_ClearFlag();
WDG_Cmd(ENABLE);
}

void FIQ_Handler(void)
{
unsigned char fiq_pend = (unsigned char)(EIC-gtFIPR);

if( fiq_pend amp 0×02 )
{
/* Clear the FIQ pending bit for Watchdog */
EIC-gtFIPR = 0×00000002 ;
if( (WDG-gtSR amp 0×0001) ampamp (WDG-gtMR amp 0×0001) )
{
/* Clear the EC pending bit */
WDG-gtSR amp= ~0×0001;

/* Stop timer by clearing SC bit in Control register */
WDG-gtCR amp= 0xFFFD;

// endless loop for debbugging purpose
while(1);
}
}

if( fiq_pend amp 0×01 )
{
/* Clear the FIQ pending bit for EXTINT0 */
EIC-gtFIPR = 0×00000001 ;
}
}
Well, when my application start running after watchdog initialization I get a FIQ interrupt for watchdog End of Count. Actually the EC flag in WDG Status Register is high: how can it be possible? Is my WdogRefresh() function wrong?
I have no watchdog reset at application startup when the watchdog timer is in watchdog mode …

Is there any appnote regarding the use of STR75x watchdog timer in timer mode?

Waiting your kind help to resolve this issue … thanks!