GD32F350CBT6 RTC以两倍速度运行怎么回事？

只看该作者 · 2021-7-5 15:05

/*
================================================================================
描述 :RTC初始化
输入 :
输出 :
================================================================================
*/
void drv_rtc_init(void)
{
#ifdef USE_RTC

__IO uint32_t prescaler_a = 0, prescaler_s = 0;

  rcu_periph_clock_enable(RCU_PMU);
  pmu_backup_write_enable();

  #if defined (RTC_CLOCK_SOURCE_IRC40K)
rcu_osci_on(RCU_IRC40K);
rcu_osci_stab_wait(RCU_IRC40K);
rcu_rtc_clock_config(RCU_RTCSRC_IRC40K);

prescaler_s = 0x18F;
prescaler_a = 0x63;
  #elif defined (RTC_CLOCK_SOURCE_LXTAL)
rcu_osci_on(RCU_LXTAL);
rcu_osci_stab_wait(RCU_LXTAL);
rcu_rtc_clock_config(RCU_RTCSRC_LXTAL);
prescaler_s = 0xFF;
prescaler_a = 0x7F;
  #else
#error RTC clock source should be defined.
  #endif /* RTC_CLOCK_SOURCE_IRC40K */
  rcu_periph_clock_enable(RCU_RTC);
  rtc_register_sync_wait();

  if(BKP_VALUE != RTC_BKP0)
  {
rtc_parameter_struct rtc_initpara;
rtc_initpara.rtc_factor_asyn = prescaler_a;
rtc_initpara.rtc_factor_syn = prescaler_s;
rtc_initpara.rtc_year = 0x16;
rtc_initpara.rtc_day_of_week = RTC_SATURDAY;
rtc_initpara.rtc_month = RTC_APR;
rtc_initpara.rtc_date = 0x30;
rtc_initpara.rtc_display_format = RTC_24HOUR;
rtc_initpara.rtc_am_pm = RTC_AM;

rtc_initpara.rtc_hour = 0;
rtc_initpara.rtc_minute = 0;
rtc_initpara.rtc_second = 0;
if(ERROR == rtc_init(&rtc_initpara))
{
   printf("\n\r** RTC time configuration failed! **\n\r");
}
else
{
   printf("\n\r** RTC time configuration success! **\n\r");
   RTC_BKP0 = BKP_VALUE;
}
  }
else
{

printf("RTC continue!\n");
}
#endif
}

以上是初始化代码，我设置了一个时间后，然后每隔5S打印一次获取到的RTC时间，发现RTC时间的间隔是10S，也就是以正常两倍的速度在运行。
以下是串口打印输出的内容。
[15:02:26.941] app sec counter=175s
[15:02:26.941] hour=12, min=55, sec=24
[15:02:26.941] ***2021-07-05 12:55:24
[15:02:26.941] rtc_time=1625460924s
[15:02:26.947]
[15:02:31.940] app sec counter=180s
[15:02:31.950] hour=12, min=55, sec=34
[15:02:31.950] ***2021-07-05 12:55:34

[15:02:31.950] rtc_time=1625460934s