/**
  **************************************************************************
  * @file     readme.txt
  * @brief    readme
  **************************************************************************
  */

  this demo is based on the ht32f49395_sk board, in this demo, shows how to use
  rtc peripherals to implement calendar and alarm clock functions. use usart1
  to view calendar information. led3 flashes once when the seconds are updated,
  and led4 turns on when the alarm is generated.
