/*!
\file readme.txt
\brief description of the calendar alarm example
\version 2021-10-30, V1.0.0, firmware for GD32W51x
*/
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This demo is based on the GD32W515P-EVAL-V1.0 board, it explains how
to configure the RTC module. In this demo, RTC peripheral is configured to keep
time and generate an alarm interrupt.
The RTC clock source can be chosen to LXTAL or IRC32K by uncomment the corresponding
define in main file. And the HyperTerminal should be connected to the evaluation
board via USART.
After start-up, the program check if the BKP data register is written to a key
value. If the value is not correct, the program will ask to set the time and alarm
value on the HyperTerminal. If the key value is correct, the time and alarm value
will be displayed on the HyperTerminal.
Then LED1 and LED2 is turned on.
The RTC module is in the Backup Domain, and is not reset by the system reset or
power reset.
When the alarm interrupt generated, the LED2 toggled. The alarm is configured to
occur once per minute.
