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Форум разработчиков электроники ELECTRONIX.ru > Микроконтроллеры (MCs) > ARM

Antonov

May 14 2015, 08:41

Здравствуйте.

Может, кто-нибудь пробовал выводить сигнал об RTC alarm на порт. Как я понял, он должен выводится на PC13 (МК stm32L), но у меня не получается. Привожу свой код.

CODE

void RTC_alarm_config(void)
{
  EXTI_InitTypeDef EXTI_InitStructure;
  RTC_AlarmTypeDef RTC_AlarmStructure;
  NVIC_InitTypeDef NVIC_InitStructure;
  
  RTC_AlarmCmd(RTC_Alarm_A, DISABLE);
	
  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);
	
  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);
 
  // time independent date
  RTC_AlarmStructure.RTC_AlarmMask = RTC_AlarmMask_DateWeekDay; 
  RTC_AlarmStructure.RTC_AlarmTime.RTC_H12 = RTC_HourFormat_24;
  RTC_AlarmStructure.RTC_AlarmTime.RTC_Hours = 15;
  RTC_AlarmStructure.RTC_AlarmTime.RTC_Minutes = 0;
  RTC_AlarmStructure.RTC_AlarmTime.RTC_Seconds = 5;
  RTC_AlarmStructure.RTC_AlarmDateWeekDay = 1;
  RTC_AlarmStructure.RTC_AlarmDateWeekDaySel = RTC_AlarmDateWeekDaySel_WeekDay;
  RTC_SetAlarm(RTC_Format_BIN, RTC_Alarm_A, &RTC_AlarmStructure);
	
  //RTC_AlarmSubSecondConfig(RTC_Alarm_A, 0xFF, RTC_AlarmSubSecondMask_SS14_5);
  RTC_OutputConfig(RTC_Output_AlarmA, RTC_OutputPolarity_Low);

  /* Enable AlarmA interrupt */
  RTC_ITConfig(RTC_IT_ALRA, ENABLE);
  
  /* Enable the alarmA */
  RTC_AlarmCmd(RTC_Alarm_A, ENABLE);
	
  RTC_ClearITPendingBit(RTC_IT_ALRA);
}

CODE

  rtc_init();
  RTC_alarm_config();
	
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOC, ENABLE);
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; //(_OUT, _AF, _AN)
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_400KHz; //(_2MHz, _10MHz, 40MHz)
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; //(_NOPULL, _UP)
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13; //(_0 ... _15)
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //(_PP - push/pull, _OD - open drain)
  GPIO_Init(GPIOC, &GPIO_InitStructure);
  GPIO_PinAFConfig(GPIOC, GPIO_PinSource13, GPIO_AF_RTC_AF1);

Прерывание по alarm работает, но ножка PC13 не дергается.

Dr.Alex

May 14 2015, 09:26

Хотел было привести свой код для стм32ф4, но он чё-то оказался мало похожим.. :-\

Antonov

May 14 2015, 09:51

Нашел в reference manual:

The selection of the RTC AFO_ALARM output is performed through the RTC_TAFCR register as follows: ALARMOUTTYPE is used to select whether the RTC AFO_ALARM output is configured in push-pull or open-drain mode.

ALARMOUTTYPE: RTC_ALARM output type
0: ALARM_AF0 is an open-drain output
1: ALARM_AF0 is a push-pull output

В библиотеке от ST - RTC_OutputTypeConfig(RTC_OutputType_PushPull);

Так теперь работает:

CODE

  RTC_AlarmCmd(RTC_Alarm_A, DISABLE);
	
  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);
	
  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);
 
  // time independent date
  RTC_AlarmStructure.RTC_AlarmMask = RTC_AlarmMask_DateWeekDay; 
  RTC_AlarmStructure.RTC_AlarmTime.RTC_H12 = RTC_HourFormat_24;
  RTC_AlarmStructure.RTC_AlarmTime.RTC_Hours = 15;
  RTC_AlarmStructure.RTC_AlarmTime.RTC_Minutes = 0;
  RTC_AlarmStructure.RTC_AlarmTime.RTC_Seconds = 5;
  RTC_AlarmStructure.RTC_AlarmDateWeekDay = 1;
  RTC_AlarmStructure.RTC_AlarmDateWeekDaySel = RTC_AlarmDateWeekDaySel_WeekDay;
  RTC_SetAlarm(RTC_Format_BIN, RTC_Alarm_A, &RTC_AlarmStructure);
	
  //RTC_AlarmSubSecondConfig(RTC_Alarm_A, 0xFF, RTC_AlarmSubSecondMask_SS14_5);
  RTC_OutputConfig(RTC_Output_AlarmA, RTC_OutputPolarity_High);
  RTC_OutputTypeConfig(RTC_OutputType_PushPull);
 
  /* Enable AlarmA interrupt */
  RTC_ITConfig(RTC_IT_ALRA, ENABLE);
  RTC_AlarmCmd(RTC_Alarm_A, ENABLE);
  RTC_ClearITPendingBit(RTC_IT_ALRA);

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