1、功能说明

    1、通过设定闹钟时间来触发闹钟中断。
    2、通过闹钟标志位来配置IO输出

2、使用环境

    软件开发环境：KEIL MDK-ARM V5.25
    硬件环境：
        1、基于评估板N32A455R-STB V1.1开发
        2、MCU：N32A455VEL7

3、使用说明
    
    系统配置；
        1、RTC时钟源：LSE
        2、闹钟IO输出：PC13
        3、串口配置：
                            - 串口为USART1（TX：PA9  RX：PA10）:
                            - 数据位：8
                            - 停止位：1
                            - 奇偶校验：无
                            - 波特率： 115200 
    使用方法：
        在KEIL下编译后烧录到评估板，上电，串口按照闹钟设定时间(默认1min)进行打印输出。
        设置#define RTC_ALARM_TEST_TYPE RTC_ALARM_TEST_TYPE_OUTPUT，编译后烧录到评估板，
        此时会切换到闹钟输出。

4、注意事项
    无


1. Function description

     1. Trigger the alarm interrupt by setting the alarm time.
     2. Configure the IO output through the alarm flag bit

2. Use environment

     Software development environment: KEIL MDK-ARM V5.25
     Hardware environment:
         1. Developed based on the evaluation board N32A455R-STB V1.1
         2. MCU：N32A455VEL7

3. Instructions for use
    
     System Configuration;
         1. RTC clock source: LSE
         2. Alarm clock IO output: PC13
         3. Serial port configuration:
                             - Serial port is USART1 (TX: PA9 RX: PA10):
                             - Data bits: 8
                             - Stop bit: 1
                             - Parity: none
                             - Baud rate: 115200
     Instructions:
         After compiling under KEIL, burn it to the evaluation board, power on, and the serial port will print out according to the time set by the alarm clock (default 1min).
         Set #define RTC_ALARM_TEST_TYPE RTC_ALARM_TEST_TYPE_OUTPUT, compile and burn to the evaluation board,
         At this point, it will switch to the alarm output.

4. Matters needing attention
     none