1、功能说明

    /* 简单描述工程功能 */
        这个例程配置并演示CAN在环回测试模式下收发CAN报文情况


2、使用环境

        软件开发环境：
        IDE工具：KEIL MDK-ARM 5.26
    
        硬件环境：
        开发板 N32L43XML-STB_V1.0


3、使用说明
    
    /* 描述相关模块配置方法；例如:时钟，I/O等 */
        SystemClock：108MHz
        USART：TX - PA9， RX - PA10，波特率115200
        CAN： RX - PA11，TX - PA12，波特率500K，环回测试模式

    /* 描述Demo的测试步骤和现象 */
        1.编译后下载程序复位运行；
        2.查看串口打印信息，CAN把发送的报文当做接收的报文并保存，
          每隔一段时间串口打印:“Check RX Message Passed”表示回环测试通过。


4、注意事项


1. Function description

	/* Briefly describe the project function */
	This routine configures and demonstrates CAN sending and receiving CAN messages in loopback test mode


2. Use environment

	Software development environment:
	IDE tool: KEIL MDK-ARM 5.26
    
	Hardware environment:
	Development Board N32L43XML-STB_V1.0


3. Instructions for use

	/* Describe related module configuration methods; for example: clock, I/O, etc. */
	SystemClock: 108MHz
	USART: TX - PA9, RX - PA10, baud rate 115200
	CAN: RX - PA11, TX - PA12, baud rate 500K, loopback test mode

	/* Describe the test steps and phenomena of the Demo */
	1. After compiling, download the program to reset and run;
	2. Check the serial port printing information, CAN regards the sent message as the received message and saves it, 
	and serial port printing every other period of time:"Check RX Message Passed"indicates that the loopback test is passed;


4. Attention

