在RTC调试过程中,出现ALR寄存器数据复位不保存的情况,而CNT可以保存.按手册上讲,这两个寄存器都在后备域中,在未发生后备域复位的情况下,这些数据应该不保存才对啊,而现在ALR不保存,CNT却可以,这是为何??以下先贴初始化程序,后贴图,望有人能解决及回答.
程序如下 ：
main()
{
u32 temp;
RCC_init();
Gpio_int();
Usart_int();
BKP_init();
Timer_init();
NVIC_init();
USART_Start_Recieive(USART1,USART1_datas);
while(1)
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void BKP_init(void)
{
/* Enable PWR and BKP clocks */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR | RCC_APB1Periph_BKP, ENABLE);
/* Allow access to BKP Domain in order to enable rtc registers*/
PWR_BackupAccessCmd(ENABLE);
/* Clear Tamper pin Event(TE) pending flag */
BKP_ClearFlag();
/* Enable Tamper pin */
BKP_TamperPinCmd(DISABLE);
if(BKP_ReadBackupRegister(BKP_DR1) != 0xA6A7)
{ /* Backup data register value is not correct or not yet programmed (when
the first time the program is executed) */
/* RTC Configuration */
GPIO_CPLBits(GPIOC,GPIO_Pin_6);
RTC_init();
RTC_WaitForLastTask(); RTC_SetAlarm(80); RTC_WaitForLastTask();
BKP_WriteBackupRegister(BKP_DR1, 0xA6A7);
}
else
{
/* Wait for RTC registers synchronization */
RTC_WaitForLastTask();
//RTC_SetAlarm(BKP_ReadBackupRegister(BKP_DR2));
RTC_WaitForLastTask();
RTC_WaitForSynchro();
/* Enable the RTC Second */
RTC_ITConfig(RTC_IT_SEC, ENABLE);
/* Wait until last write operation on RTC registers has finished */
RTC_WaitForLastTask();
}
}
void RTC_init(void)
{
/* Enable PWR and BKP clocks */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR | RCC_APB1Periph_BKP, ENABLE);
/* Allow access to BKP Domain in order to enable rtc registers*/
PWR_BackupAccessCmd(ENABLE);
//Reset Backup Domain,此执令会将备份域数据清零,建议初始化时屏蔽掉
BKP_DeInit();
#ifdef RTCClockSource_LSI
RCC_LSICmd(ENABLE); /* Enable LSI */
while(RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET); /* Wait till LSI is ready */
RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI); /* Select LSI as RTC Clock Source */
#elif defined RTCClockSource_LSE
RCC_LSEConfig(RCC_LSE_ON); /* Enable LSE */
while(RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET); /* Wait till LSE is ready */
RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE);/* Select LSE as RTC Clock Source */
#endif
/* Enable RTC Clock */
RCC_RTCCLKCmd(ENABLE);
#ifdef RTCClockOutput_Enable
/* Disable the Tamper Pin */
BKP_TamperPinCmd(DISABLE); /* To output RTCCLK/64 on Tamper pin, the tamper
functionality must be disabled */
BKP_RTCCalibrationClockOutputCmd(ENABLE); /* Enable RTC Clock Output on Tamper Pin */
#endif
/* Wait for RTC registers synchronization */
RTC_WaitForSynchro();
RTC_WaitForLastTask();
/* Enable the RTC Second */
RTC_ITConfig(RTC_IT_SEC, ENABLE);
/* Set RTC prescaler: set RTC period to 1sec */
#ifdef RTCClockSource_LSI
RTC_SetPrescaler(39999); /* RTC period = RTCCLK/RTC_PR = (40.000 KHz)/(39999+1) */
#elif defined RTCClockSource_LSE
RTC_SetPrescaler(32767); /* RTC period = RTCCLK/RTC_PR = (32.768 KHz)/(32767+1) */
#endif
/* Wait until last write operation on RTC registers has finished */
RTC_WaitForLastTask();
}
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