RTC 唤醒深度睡眠模式

只看该作者 · 2023-6-23 17:27

本帖最后由小小蚂蚁举千斤于 2023-6-23 17:32 编辑

一、RTC 自动唤醒
系统上电后，LED1 闪烁。当 Tamper 按键按下后，产生 EXTI 中断，在此中断中开启 RTC 自动唤醒功能；退出 EXTI 中断后，MCU 进入进入深度睡眠模式 1 且 LED1 停止闪烁。当自动唤醒时间到达后，产生 RTC 自动唤醒事件并将系统从深度睡眠模式 1 唤醒，LED 继续闪烁。由于事先开启了 RTC 自动唤醒中断，在唤醒后将进入 RTC 唤醒中断，在中断中关闭自动唤醒功能。
RTC 自动唤醒相关配置如下：
1. RTC 自动唤醒配置

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void rtc_configuration(void)

{

rtc_parameter_struct rtc_initpara;

__IO uint32_t prescaler_a = 0x7F, prescaler_s = 0xFF;

/* enable PMU and BKPI clocks */

rcu_periph_clock_enable(RCU_PMU);

rcu_periph_clock_enable(RCU_BKP);

/* allow access to BKP domain */

pmu_backup_write_enable();

rcu_periph_clock_enable(RCU_RTC);

/* enable LXTAL */

rcu_osci_on(RCU_LXTAL);

/* wait for LXTAL stabilization flag */

rcu_osci_stab_wait(RCU_LXTAL);

rcu_lxtal_clock_monitor_enable();

/* configure the RTC clock source selection */

rcu_rtc_clock_config(RCU_RTCSRC_LXTAL);

rtc_register_sync_wait();

/* setup RTC time value */

rtc_initpara.factor_asyn = prescaler_a;

rtc_initpara.factor_syn = prescaler_s;

rtc_initpara.year = 0x16;

rtc_initpara.day_of_week = RTC_WEDNESDAY;

rtc_initpara.month = RTC_SEP;

rtc_initpara.date = 0x07;

rtc_initpara.display_format = RTC_24HOUR;

rtc_initpara.am_pm = RTC_AM;

rtc_initpara.hour = 0x09;

rtc_initpara.minute = 0x28;

rtc_initpara.second = 0;

rtc_init(&rtc_initpara);

/* EXTI line 20 configuration */

nvic_irq_enable(RTC_WKUP_IRQn, 2);

exti_flag_clear(EXTI_20);

exti_init(EXTI_20, EXTI_INTERRUPT, EXTI_TRIG_RISING);

rtc_flag_clear(RTC_STAT_WTF);

/* wakeup clock configuration */

rtc_wakeup_clock_set(WAKEUP_CKSPRE);

rtc_wakeup_timer_set(2);

rtc_interrupt_enable(RTC_INT_WAKEUP);

rtc_wakeup_disable();

}

只看该作者 · 2023-6-23 17:29

2. RTC 自动唤醒中断处理

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void RTC_WKUP_IRQHandler(void)

{

if(RESET != rtc_flag_get(RTC_FLAG_WT)) {

/* clear EXTI line 20 pending and rtc wakeup flag */

rtc_flag_clear(RTC_FLAG_WT);

exti_flag_clear(EXTI_20);

/* disable rtc auto wakeup function */

rtc_wakeup_disable();

}

}

3. 按键中断处理

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void EXTI10_15_IRQHandler(void)

{

if(SET == exti_interrupt_flag_get(EXTI_13)) {

/* clear EXTI line 13 pending flag */

exti_interrupt_flag_clear(EXTI_13);

enter_deepsleep_flag = 1;

/* enable RTC auto wakeup function */

rtc_wakeup_enable();

}

}

只看该作者 · 2023-6-23 17:31

本帖最后由小小蚂蚁举千斤于 2023-6-23 17:33 编辑

二、RTC 闹钟唤醒
系统上电后，LED1 闪烁。当 Tamper 按键按下后，产生 EXTI 中断，在此中断中更新 RTC 闹钟时间并开启闹钟功能；退出 EXTI 中断后，MCU 进入进入深度睡眠模式 1 且 LED1 停止闪烁。当闹钟时间到达后，产生 RTC 闹钟事件并将系统从深度睡眠模式 1 唤醒，LED 继续闪烁。。由于事先开启了 RTC 闹钟 0 中断，在唤醒后将进入 RTC 闹钟中断，在中断中关闭闹钟0 功能。
RTC 闹钟唤醒相关配置如下：

1. RTC 闹钟唤醒配置

复制

void rtc_configuration(void)

{

rtc_parameter_struct rtc_initpara;

__IO uint32_t prescaler_a = 0x7F, prescaler_s = 0xFF;

/* enable PMU and BKPI clocks */

rcu_periph_clock_enable(RCU_PMU);

rcu_periph_clock_enable(RCU_BKP);

/* allow access to BKP domain */

pmu_backup_write_enable();

rcu_periph_clock_enable(RCU_RTC);

/* enable LXTAL */

rcu_osci_on(RCU_LXTAL);

/* wait for LXTAL stabilization flag */

rcu_osci_stab_wait(RCU_LXTAL);

rcu_lxtal_clock_monitor_enable();

/* configure the RTC clock source selection */

rcu_rtc_clock_config(RCU_RTCSRC_LXTAL);

rtc_register_sync_wait();

/* setup RTC time value */

rtc_initpara.factor_asyn = prescaler_a;

rtc_initpara.factor_syn = prescaler_s;

rtc_initpara.year = 0x16;

rtc_initpara.day_of_week = RTC_WEDNESDAY;

rtc_initpara.month = RTC_SEP;

rtc_initpara.date = 0x07;

rtc_initpara.display_format = RTC_24HOUR;

rtc_initpara.am_pm = RTC_AM;

rtc_initpara.hour = 0x09;

rtc_initpara.minute = 0x28;

rtc_initpara.second = 0;

rtc_init(&rtc_initpara);

/* RTC alarm configuration */

rtc_alarm_struct rtc_alarm;

rtc_alarm_disable(RTC_ALARM0);

rtc_alarm.alarm_mask = RTC_ALARM_DATE_MASK | RTC_ALARM_HOUR_MASK |

RTC_ALARM_MINUTE_MASK;

rtc_alarm.weekday_or_date = RTC_ALARM_DATE_SELECTED;

rtc_alarm.alarm_day = 0x31;

rtc_alarm.am_pm = RTC_AM;

rtc_alarm.alarm_hour = 0x09;

rtc_alarm.alarm_minute = 0x28;

rtc_alarm.alarm_second = 0x00;

rtc_alarm_config(RTC_ALARM0, &rtc_alarm);

/* EXTI line 17 configuration */

nvic_irq_enable(RTC_Alarm_IRQn, 0);

exti_flag_clear(EXTI_17);

exti_init(EXTI_17, EXTI_INTERRUPT, EXTI_TRIG_RISING);

rtc_flag_clear(RTC_STAT_ALRM0F);

/* enable alram 0 interrupt */

rtc_interrupt_enable(RTC_INT_ALARM0);

rtc_alarm_disable(RTC_ALARM0);

}

只看该作者 · 2023-6-23 17:32

2. RTC 闹钟中断处理

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void RTC_Alarm_IRQHandler(void)

{

if(RESET != rtc_flag_get(RTC_FLAG_ALARM0)) {

/* clear EXTI line 20 pending and rtc alarm flag */

rtc_flag_clear(RTC_FLAG_ALARM0);

exti_flag_clear(EXTI_17);

/* disable rtc alarm 0 function */

rtc_alarm_disable(RTC_ALARM0);

}

}

3. 按键中断处理

复制

void EXTI10_15_IRQHandler(void)

{

if(SET == exti_interrupt_flag_get(EXTI_13)) {

/* clear EXTI line 13 pending flag */

exti_interrupt_flag_clear(EXTI_13);

enter_deepsleep_flag = 1;

/* update rtc alarm time*/

rtc_alarm_update(0x03);

}

}