Posted on June 26, 2014 at 15:07Hi,
I am using STM32l151vbt6 MCU and I am trying to configure RTC Alarm for ever 15th minute that is 0, 15, 30 and 45th minute of the every hour. I can configure the Alarm and it will work for the first time, If I try to set it again after the alarm occurs, it would set to previous alarm state. If i reset the MCU i can set the alarm and it will wake the controller from the stop mode when the alarm occurs, Please let me know how can i set the next alarm without resetting the MCU.
Alarm Configure Code:
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
/* 8(hour) and 19(day) are masked and there is no effect on the alarm */
RTC_AlarmTypeDef RTC_AlarmStructure =
{
0,
0,
0,
RTC_H12_AM,
(RTC_AlarmMask_DateWeekDay | RTC_AlarmMask_Hours),
RTC_AlarmDateWeekDaySel_Date,
19
};
const uint32_t alarm_interval[4] = { 15, 30, 45, 0 };
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
RTC_Read();
RTC_AlarmStructure.RTC_AlarmTime.RTC_Minutes = alarm_interval[RTC_current_time.minute / 15];
RTC_Alarm_Config(&RTC_AlarmStructure);
void RTC_Alarm_Config(RTC_AlarmTypeDef *RTC_AlarmStructure)
{
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
EXTI_InitTypeDef EXTI_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
RTC_AlarmCmd(RTC_Alarm_A, DISABLE);
/* EXTI configuration */
EXTI_ClearITPendingBit(EXTI_Line17);
EXTI_InitStructure.EXTI_Line = EXTI_Line17;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
/* Enable the RTC Alarm Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = RTC_Alarm_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
RTC_SetAlarm(RTC_Format_BIN, RTC_Alarm_A, RTC_AlarmStructure);
/* Clear RTC AlarmA Flags */
RTC_ClearITPendingBit(RTC_IT_ALRA);
/* Enable AlarmA interrupt */
RTC_ITConfig(RTC_IT_ALRA, ENABLE);
/* Enable the alarmA */
RTC_AlarmCmd(RTC_Alarm_A, ENABLE);
}
Alarm ISR:
EXTI_ClearITPendingBit(EXTI_Line17);
if(RTC_GetITStatus(RTC_IT_ALRA) != RESET)
{
/* Clear RTC AlarmA Flags */
RTC_ClearITPendingBit(RTC_IT_ALRA);
}
#rtc-alarm
