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/** ************************************************************************** * @file readme.txt * @version v2.0.4 * @date 2022-04-02 * @brief readme ************************************************************************** */ this demo is based on the at-start 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.