void rtc_init(void)
{
RCC->APB1ENR|=1<<28; //POWER interface clock enable
PWR->CR|=1<<8; //Access RTC and Backup registers enabled
RCC->APB1ENR|=1<<27; //Backp interface clock enabled
RCC->BDCR|=1<<16; //RESET the entire Backup domain
//BKP->RTCCR|=1<<7;
//RCC->APB2ENR|=1<<4;
//GPIOC->CRH&=0X00FFFFFF;
//GPIOC->CRH|=0xb4000000;
//RCC->BDCR&=~(1<<2);
//RCC->BDCR|=1<<0; //LSEON
//while((RCC->BDCR&0x00000002)==0); //wait LSE ready
//RCC->CSR|=1<<0;
//while((RCC->CSR&(1<<1))==0); //LSI used as RTC clock
RCC->BDCR|=3<<8; //select LSE used as RTC clock
RCC->BDCR|=1<<15; //RTC clock enable
//配置RTC
//RTC->CRL&=~(1<<3);
while((RTC->CRL&(1<<5))==0);
RTC->CRL|=1<<4; // ENTER configuration mode
//RTC->CRH=0; // NO interrupt
//RTC->PRLH=0;
RTC->PRLL=0X7FFF; //RTC->PRL=0X00007FFF,即TR_CLK=1Hz
//RTC->CNTH=0;
//RTC->CNTL=0;
RTC->CRL&=~(1<<4); //Exit configuration mode
while((RTC->CRL&(1<<5))==0);
}
不能成功,望大侠们指正 |
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