Posted on May 17, 2011 at 14:11Hi clive,
well, here is my IT :
void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
/* 2 bits for Preemption Priority and 2 bits for Sub Priority */
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
NVIC_InitStructure.NVIC_IRQChannel = RTCAlarm_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
void RTCAlarm_IRQHandler(void)
{
if(RTC_GetITStatus(RTC_IT_ALR) != RESET)
{
/* Clear EXTI line17 pending bit */
EXTI_ClearITPendingBit(EXTI_Line17);
/* Check if the Wake-Up flag is set */
if(PWR_GetFlagStatus(PWR_FLAG_WU) != RESET)
{
/* Clear Wake Up flag */
PWR_ClearFlag(PWR_FLAG_WU);
}
/* Wait until last write operation on RTC registers has finished */
RTC_WaitForLastTask();
/* Clear RTC Alarm interrupt pending bit */
RTC_ClearITPendingBit(RTC_IT_ALR);
/* Wait until last write operation on RTC registers has finished */
RTC_WaitForLastTask();
RTC_irq_counter++;
if (RTC_irq_counter == 64)
{
RTC_irq_counter = 0;
current_timestamp++;
LED_TOOGLE();
}
RTC_SetAlarm(RTC_GetCounter()+ 1);
RTC_WaitForLastTask();
}
}
Here is the main loop :
while(1)
{
PWR_EnterSTOPMode(PWR_Regulator_LowPower, PWR_STOPEntry_WFI);
}
And here is the RTC init function :
void RTC_Configuration(void)
{
/* RTC clock source configuration ------------------------------------------*/
/* Allow access to BKP Domain */
PWR_BackupAccessCmd(ENABLE);
/* Reset Backup Domain */
BKP_DeInit();
/* Enable the LSE OSC */
RCC_LSEConfig(RCC_LSE_ON);
/* Wait till LSE is ready */
while(RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET)
{
}
/* Select the RTC Clock Source */
RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE);
/* Enable the RTC Clock */
RCC_RTCCLKCmd(ENABLE);
/* RTC configuration -------------------------------------------------------*/
/* Wait for RTC APB registers synchronisation */
RTC_WaitForSynchro();
/* Set the RTC time base to 64Hz */
RTC_SetPrescaler( ( 32768/64 ) -1);
/* Wait until last write operation on RTC registers has finished */
RTC_WaitForLastTask();
/* Enable the RTC Alarm interrupt */
RTC_ITConfig(RTC_IT_ALR, ENABLE);
/* Wait until last write operation on RTC registers has finished */
RTC_WaitForLastTask();
}
Thanks for help.
V.
