1. ˵
    չʾ RT_Thread ϵͳ UART 豸

2. ʹû
    Ӳ̶ӦĿӲƽ̨ 
    壺   N32G4FRH_STB V1.1

3. ʹ˵
    ģ÷:ʱӣI/O 
         1. SystemClock144MHz
         2. GPIOLED1(D1)--PA8
                        USART2: TX--PA2  RX--PA3
                        ־USART1)TX--PA9  RX--PA10ʣ115200

    DemoĲԲ 
         1. سλ
         2. main()洴̣߳test0 ̺߳ test1 ̣߳test0 ߳ڿ D1 250ms˸test1߳в UART 豸ͽչܣ
            ͨڹ߽ USART2  TX  RX ϣϵͨ USART2  TX ݣλͨڹ߷ݵ USART2  RX ϣUSART2 Ὣյͨ TX ٷͳȥ

4. ע
    

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

2. Use environment
    Hardware environment: development hardware platform corresponding to the project 
    Development board:      N32G4FRH_STB V1.1

3. Instructions for use
    Describe the configuration method of related modules; for example: clock, I/O, etc. 
        1. SystemClock: 144MHz
        2. GPIO: LED1(D1)--PA8
                     USART2: TX--PA2  RX--PA3
                     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 250ms flashing, test1 thread is used to test the sending and receiving function of UART device. 
            It is connected to TX and RX of USART2 through serial port tool. After power-on, data will be sent through TX of USART2 first. The upper computer software will send data to RX of USART2 through serial port tool, and USART2 will send the received data through TX again

4. Matters needing attention
    None