RTC — 日历演示

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#include "gd32f30x.h"
#include "gd32f307c_eval.h"
#include "rtc.h"
#include <stdio.h>

int main(void)
{
    /* COM0 config */
    gd_eval_com_init(EVAL_COM0);

    /* NVIC config */
    nvic_configuration();

    /* enable PMU and BKPI clocks */
    rcu_periph_clock_enable(RCU_BKPI);
    rcu_periph_clock_enable(RCU_PMU);

    /* allow access to BKP domain */
    pmu_backup_write_enable();
    if(RESET != (RCU_BDCTL & RCU_BDCTL_BKPRST)) {
        rcu_bkp_reset_disable();
    }

    printf( "\r\n This is a RTC demo...... \r\n" );

    /* get RTC clock entry selection */
    RTCSRC_FLAG = GET_BITS(RCU_BDCTL, 8, 9);

    if ((0xA5A5 != bkp_read_data(BKP_DATA_0)) || (0x00 == RTCSRC_FLAG)){
        /* backup data register value is not correct or not yet programmed
        or RTC clock source is not configured (when the first time the program 
        is executed or data in RCU_BDCTL is lost due to Vbat feeding) */
        printf("\r\nThis is a RTC demo!\r\n");
        printf("\r\n\n RTC not yet configured....");

        /* RTC configuration */
        rtc_configuration();

        printf("\r\n RTC configured....");

        /* adjust time by values entred by the user on the hyperterminal */
        time_adjust();

        bkp_write_data(BKP_DATA_0, 0xA5A5);
    }else{
        /* check if the power on reset flag is set */
        if (rcu_flag_get(RCU_FLAG_PORRST) != RESET){
            printf("\r\n\n Power On Reset occurred....");
        }else if (rcu_flag_get(RCU_FLAG_SWRST) != RESET){
            /* check if the pin reset flag is set */
            printf("\r\n\n External Reset occurred....");
        }

        /* allow access to BKP domain */
        rcu_periph_clock_enable(RCU_PMU);
        pmu_backup_write_enable();

        printf("\r\n No need to configure RTC....");
        /* wait for RTC registers synchronization */
        rtc_register_sync_wait();

        /* enable the RTC second */
        rtc_interrupt_enable(RTC_INT_SECOND);

        /* wait until last write operation on RTC registers has finished */
        rtc_lwoff_wait();
    }

#ifdef RTCCLOCKOUTPUT_ENABLE
    /* enable PMU and BKPI clocks */
    rcu_periph_clock_enable(RCU_BKPI);
    rcu_periph_clock_enable(RCU_PMU);
    /* allow access to BKP domain */
    pmu_backup_write_enable();

    /* disable the tamper pin */
    bkp_tamper_detection_disable();

    /* enable RTC clock output on tamper Pin */
    bkp_rtc_calibration_output_enable();
#endif

    /* clear reset flags */
    rcu_all_reset_flag_clear();

    /* display time in infinite loop */
    time_show();

    while (1){
    }
}