Posted on March 27, 2008 at 11:25Hi 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.
