/*!
    \file    readme.txt
    \brief   description of RTC's the auto-wakeup with IRC32K clock functional attributes example

    \version 2025-07-15, V1.0.0, firmware for GD32G5x3
*/

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*/

  This demo is based on the GD32G553Q-EVAL-V1.0 board, it explains how
to use the auto wakeup function of RTC. In this demo, RTC peripheral is configured to keep
time and generate the wakeup interrupt.

  The RTC clock source can be chose to LXTAL or IRC32K by uncomment the corresponding
define in main file. And the hyperthermia should be connected to the evaluation
board via USART. The vbat bin on the board should connect to the CR1220 battery.

  After start-up,get key value from BKP data register or bit RTCSRC of backup domain
control register. If the value is not correct, the program will ask to set the time
value on the hyperthermia. If the key value is correct, the current time and subsecond value
will be displayed on the hyperthermia.

  Then LED1 is turned on.

  The RTC module is in the Backup Domain, and is not reset by the system reset or
power reset.

   Auto wakeup interrupt will be generated every  6 seconds , the current time
will be print on the hyperthermia, and LED1 toggles.
