1、功能说明

    该测例演示了USARTy与USARTz间通过中断实现的基础通信。
    USARTy发送TxBuffer1数据至USARTz，USARTz接收数据存至RxBuffer2，比较接收数据与发送数据，比较结果存入TransferStatus变量。


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：
        N32H730  
        N32H735   
        N32H735EC
        N32H760
        N32H762
        N32H765
        N32H765EC
        N32H785
        N32H785EC
        N32H787
        

3、使用说明
    系统配置
        1、时钟源：HSI+PLL
        2、系统时钟频率：
            N32H760系列：    600MHz

    USART配置如下：
    - 波特率 = 115200 baud
    - 字长 = 8数据位
    - 1停止位
    - 校验控制禁用
    - 硬件流控制禁用（RTS和CTS信号）
    - 接收器和发送器使能
    
    USART引脚连接如下：    
     - USART3_Tx.PD8 <-------> UART9_Rx.PB8
     - USART3_Rx.PD9 <-------> UART9_Tx.PB9 

    
    测试步骤与现象：
    - Demo在KEIL环境下编译后，下载至MCU
    - 复位运行,串口打印PASSED为测试通过，FAILED为测试异常。


4、注意事项


1. Function description

    This test example demonstrates basic communication between USARTy and USARTz through interrupts.
    USARTy sends TxBuffer1 data to USARTz, and USARTz receives data to RxBuffer2，Compare the received data with the sent data, and store the comparison result into the TransferStatus variable.

  2. Development environment

    Software development environment: KEIL MDK-ARM V5.34
  			                                     IAR EWARM 8.50.1 
 
    Supported chips:
        N32H730  
        N32H735   
        N32H735EC
        N32H760
        N32H762
        N32H765
        N32H765EC
        N32H785
        N32H785EC
        N32H787
        

3. How to use

    USART is configured as follows:
    - Baud rate = 115200 baud
    - Word length = 8 data bits
    - 1 stop bit
    - checksum control disabled
    - Hardware flow control disabled (RTS and CTS signals)
    - Receiver and transmitter enable

   The USART pins are connected as follows:
     - USART3_Tx.PD8 <-------> UART9_Rx.PB8
     - USART3_Rx.PD9 <-------> UART9_Tx.PB9 

    Test steps and phenomena:
    - Demo is compiled in KEIL environment and downloaded to MCU
   - Reset operation, the serial port prints PASSED to indicate that the test has passed, and FAILED to indicate that the test is abnormal.


4. Attention