RTC and EXTIT_Line15 interrupt

[shai2]

Posted on March 27, 2008 at 11:25

RTC and EXTIT_Line15 interrupt

[shai2]

Posted on March 27, 2008 at 11:25

Hi all,

I work with STR751 device and i have strange phenomenon with some of the devices.

I configured the RTC EXTIT line 15 and P1.15 as shown below.

The code is work fine but I have some devices thet didn't jump to the WAKUP_IRQHandler (EXTIT_Line15) interrupt after every 10 seconds.

after some testing I found that the RTC_FLAG_Alarm is set after every 10 seconds but EXTIT_ITLine15 pending bit is remain in reset.

I tried to stimulate EXTIT_ITLine15 interrupt by setting P1.15

GPIO_WriteBit(GPIO1, GPIO_Pin_15, Bit_RESET);

GPIO_WriteBit(GPIO1, GPIO_Pin_15, Bit_SET);

GPIO_WriteBit(GPIO1, GPIO_Pin_15, Bit_RESET);

But EXTIT_ITLine15 pending bit is remain in reset.

Did anyone have an idea why the EXTIT_ITLine15 pending bit remain in reset????

///////////////////////////////////////////////////////////

// RTC configuration

// Enable RTC Clock

MRCC_PeripheralClockConfig(MRCC_Peripheral_RTC, ENABLE);

// Wait for RTC registers synchronization

RTC_WaitForSynchro();

// Wait until last write operation on RTC registers has finished

RTC_WaitForLastTask();

// Set RTC prescaler: set RTC period to 1 second

RTC_SetPrescaler(32767);

// Wait until last write operation on RTC registers has finished

RTC_WaitForLastTask();

// Enable the RTC Second interrupt

//RTC_ITConfig(RTC_IT_Second, ENABLE);

RTC_ITConfig((RTC_IT_Second | RTC_IT_Overflow | RTC_IT_Alarm), DISABLE);

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15;

GPIO_Init(GPIO1, &GPIO_InitStructure);

GPIO_WriteBit(GPIO1, GPIO_Pin_15, Bit_RESET);

// Enable EXTIT line 15 (RTC Alarm) on rising edge

EXTIT_ClearITPendingBit(EXTIT_ITLine15);

Init_EXTIT(EXTIT_ITLine15, EXTIT_ITTrigger_Rising, ENABLE);

///////////////////////////////////////////////////////////

void WAKUP_IRQHandler(void)

{

if(RTC_GetFlagStatus(RTC_FLAG_Alarm) != RESET)

{

// Clear the RTC Alarm pending bit

RTC_ClearFlag(RTC_FLAG_Alarm);

SleepCounter++;

if (SleepCounter == NumOfCountToSleep)

{

......

}

// Wait until last write operation on RTC registers has finished

RTC_WaitForLastTask();

// Alarm in 10 seconds

RTC_SetAlarm(RTC_GetCounter() + 10);

// Wait until the write operation is performed

while(RTC_GetFlagStatus(RTC_FLAG_RTOFF) == RESET);

}

// Clear EXTIT line15 pending bit

EXTIT_ClearITPendingBit(EXTIT_ITLine15);

}

Thanks in advance.