1、功能说明

	1、此例程展示在 RT_Thread 系统创建 WATCHDOG 设备

2、使用环境

	/* 硬件环境：工程对应的开发硬件平台 */
	开发板：N32L43XM-STB N32L40XM-STB V1.1

3、使用说明
	
	/* 描述相关模块配置方法；例如:时钟，I/O等 */
	SystemClock：64MHz
    IWDG时钟源： LSI/32
	GPIO:	       
		LED:	D1--PA8
        KEY:	KEY1--PA4
				KEY2--PA5
	串口:  USART1: TX--PA9  RX--PA10    波特率:115200

	/* 描述Demo的测试步骤和现象 */
	1.编译后下载程序复位运行
    2.本例程创建两个线程，test0线程和test1线程，test0线程用于控制 D1 500ms闪烁，在test1线程中测试 IWDG 设备，查找 IWDG 设备，设置超时时间，启动 IWDG，在空闲时喂狗。

4、注意事项
	无


1. Function description
    This routine shows how to create a WATCHDOG device on the RT_Thread system

2. Use environment
    Hardware environment: development hardware platform corresponding to the project 
    Development board:      N32L43XM-STB N32L40XM-STB V1.1

3. Instructions for use
    Describe the configuration method of related modules; for example: clock, I/O, etc. 
        1. SystemClock：64MHz
    	2.IWDG时钟源： LSI/32
	3.GPIO:	       LED:	D1--PA8
        Log(USART1): TX--PA9 RX--PA10 Baud rate: 115200

    Describe the test steps and phenomena of Demo 
        1. After compiling, download the program to reset and run;
        2. This routine creates two threads in main(), test0 thread and test1 thread, test0 thread is used to control D1 500ms flashing, test1 thread is used to test the IWDG device, 
            find the IWDG device, set the timeout, start the IWDG, and feed the dog when idle

4. Attention
    None.