本帖最后由 Sam131208 于 2023-11-29 08:57 编辑
RTC唤醒配置为0.5秒唤醒一次，上电后，前三次唤醒，大概1秒多才中断一次。
另外还有未确认的问题，CPU计算任务重的时候，0.5秒的中断，似乎也变为了1秒钟。
在STOP2模式下，0.5秒中断比较稳定，尚未发现问题。
下面时RTC初始化：
中断处理：
- EXTI_ClrITPendBit(EXTI_LINE20);
- if (RTC_GetITStatus(RTC_INT_WUT) != RESET)
- {
- RTC_ClrIntPendingBit(RTC_INT_WUT);
- }
初始化： - RTC_InitType RTC_InitStructure;
- RTC_DateType RTC_DateStructure;
- RTC_TimeType RTC_TimeStructure;
- EXTI_InitType EXTI_InitStructure;
- NVIC_InitType NVIC_InitStructure;
-
- PWR_BackupAccessEnable(ENABLE);
- if (0xA5A5 != BKP_ReadBkpData(0x0000) )
- {
- /* Enable the PWR clock */
- RCC_EnableAPB1PeriphClk(RCC_APB1_PERIPH_PWR, ENABLE);
- RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_AFIO, ENABLE);
- /* Allow access to RTC */
- PWR_BackupAccessEnable(ENABLE);
- /* Disable RTC clock */
- RCC_EnableRtcClk(DISABLE);
- /* Enable the LSE OSC32_IN PC14 */
- RCC_EnableLsi(DISABLE); // LSI is turned off here to ensure that only one clock is turned on
- RCC_ConfigLse(RCC_LSE_ENABLE,0x1FF);
- /****Waite LSE Ready *****/
- while(RCC_GetFlagStatus(RCC_LDCTRL_FLAG_LSERD) == RESET){
-
- };
- RCC_ConfigRtcClk(RCC_RTCCLK_SRC_LSE);
- RCC_EnableRtcClk(ENABLE);
- RTC_WaitForSynchro();
- /* Configure the RTC data register and RTC prescaler */
- RTC_InitStructure.RTC_AsynchPrediv = 0x7F;
- RTC_InitStructure.RTC_SynchPrediv = 0xff;
- RTC_InitStructure.RTC_HourFormat = RTC_24HOUR_FORMAT;
- /* Check on RTC init */
- if (RTC_Init(&RTC_InitStructure) == ERROR)
- {
- }
- RTC_DateStructure.WeekDay = 7;
- RTC_DateStructure.Date = 1;
- RTC_DateStructure.Month = 10;
- RTC_DateStructure.Year = 23;
- if(RTC_SetDate(RTC_FORMAT_BIN, &RTC_DateStructure) == ERROR){
- }
- RTC_TimeStructure.H12 = RTC_AM_H12;
- RTC_TimeStructure.Hours = 0;
- RTC_TimeStructure.Minutes = 0;
- RTC_TimeStructure.Seconds = 0;
- if (RTC_ConfigTime(RTC_FORMAT_BIN, &RTC_TimeStructure) == ERROR){
- }
- /* wake up clock select */
- RTC_ConfigWakeUpClock(RTC_WKUPCLK_RTCCLK_DIV16);
- /* wake up timer value */
- RTC_SetWakeUpCounter(0x400 - 1);
- BKP_WriteBkpData(0x0000, 0xA5A5);
- }
- EXTI_ClrITPendBit(EXTI_LINE20);
- EXTI_InitStructure.EXTI_Line = EXTI_LINE20;
- EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
- EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
- EXTI_InitStructure.EXTI_LineCmd = ENABLE;
- EXTI_InitPeripheral(&EXTI_InitStructure);
- /* Enable the RTC WakeUp Interrupt */
- NVIC_InitStructure.NVIC_IRQChannel = RTC_IRQn;
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
- NVIC_Init(&NVIC_InitStructure);
- /* Enable the RTC Wakeup Interrupt */
- RTC_ClrIntPendingBit(RTC_INT_WUT);
- RTC_ConfigInt(RTC_INT_WUT, ENABLE);
- RTC_EnableWakeUp(ENABLE);
| 
楼主
