1、功能说明
    此例程展示了如何在CM7与CM4内核之间使用内置的DCMU的轮询方式来来信号同步。

2、使用环境

    软件开发环境：KEIL MDK-ARM V5.34
                  IAR EWARM 8.50.1 
    芯片支持：
          N32H785 系列
          N32H785xxxxEC 系列
          N32H787 系列


3、使用说明

    系统配置
        1、时钟源：HSI+PLL
        2、系统时钟频率：
           M7核 600MHz  M4核 300MHz
        3、GPIO：
            PA2(D2)为推挽输出功能
            
    使用方法：
        1、编译后将CM7和CM4的工程程序分别下载到开发板并复位运行;
        2、可观察到D2间隔100ms循环闪烁，然后发送数据信号;
        3、CM4接收到数据信号之后，D1间隔300ms循环闪烁，然后发送数据信号;
        4、CM7接收到数据信号之后，D1间隔100ms循环闪烁，依次循环......
        

4、注意事项
    无
    
1. Function description

    This example shows how to use the built-in DCMU polling method for signal synchronization between the CM7 and CM4 cores.

2. Development environment

    Software development environment: KEIL MDK-ARM V5.34
                                      IAR EWARM 8.50.1 
    Supported chips:
          N32H785 series
          N32H785xxxxEC series
          N32H787 series

3. How to use

    System Configuration:
        1. Clock source: HSI+PLL
        2. System Clock frequency: 
           M7 Core：600MHz  M4 Core：300MHz
           
        3.GPIO:         
            PA2 (D2) is selected as push-pull output function

     Instructions:
        1. After compiling, download the program of CM7 and CM4 projects respectively and reset, the program start running；
        2. It can be observed that D1 blinks cyclically at an interval of 100ms, and then send the message semaphore.
        3. After CM4 receives the message semaphore, D1 blinks in 300ms interval, and then send the message semaphore;
        4. After CM7 receives the message semaphore, D1 blinks cyclically at 100ms intervals, and so on. ......

4. Attention
    None

