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================================================================================
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样例使用说明
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Sample Description
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================================================================================
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功能描述：
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此样例演示了USART的DMA方式发送和接收数据，USART配置为115200，数据位8，停止位1，
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校验位None,下载并运行程序后，打印提示信息，然后通过上位机下发12个数据，例如
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0x1~0xC,则MCU会把接收到的数据再次发送到上位机，然后打印结束信息。
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Function descriptions:
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This example demonstrates how to use USART to send an amount of data in DMA
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mode USART configuration is 115200 baud rate, data bit 8, stop bit 1, check bit
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None. After download and run the program,Print the prompt message, and then send
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12 data through the upper computer, such as 0x1~0xC, the MCU will send the
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received data to the upper computer again, Then print the end message
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================================================================================
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测试环境：
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测试用板：PY32F403_STK
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MDK版本：5.28
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IAR版本：9.20
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GCC版本：GNU Arm Embedded Toolchain 10.3-2021.10
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Test environment:
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Test board: PY32F403_STK
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MDK Version: 5.28
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IAR Version: 9.20
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GCC Version: GNU Arm Embedded Toolchain 10.3-2021.10
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================================================================================
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使用步骤：
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1. 编译并下载程序到MCU；
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2. 通过USB转TTL模块连接PC与STK板，STK板与USB转TTL模块的连线方式如下：
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STK板 USB转TTL模块
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PA02(TX) --> RX
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PA03(RX) --> TX
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GND --> GND
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3. PC端打开串口调试助手，正确连接上通讯COM口，波特率设置为115200；
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4. 按下复位按键，MCU会发送aTxStartMessage数组内的数据到上位机，提示输入12个数据。
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5. 上位机发送12个数据到MCU，MCU会反馈同样的12个数据给上位机。同时发送aTxEndMessage
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数组内数据到上位机，提示样例执行结束。
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6. 观察开发板上的指示灯，长亮表示通信正常，反之通信异常。
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Example execution steps:
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1. Compile and download the program to the MCU;
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2. Connect the PC and STK board with a USB to TTL module. The connection between
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the STK board and the USB to TTL module is as follows:
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STK board USB to TTL module
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PA02(TX) --> RX
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PA03(RX) --> TX
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GND --> GND
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3. Open a serial debugging assistant on the PC and connect to the appropriate COM
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port with the baud rate set to 115200;
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4. When the reset button is pressed, the MCU sends the data in the aTxStartMessage
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array to the host computer, prompting for 12 data inputs.
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5. The host computer sends 12 data to the MCU and the MCU feeds back the same 12
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data to the host computer. Also send the data in the aTxEndMessage array to the
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host computer to signal the end of the sample execution.
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6. Observe the indicator light on the development board, a long light means that
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the communication is normal, and vice versa, the communication is abnormal.
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================================================================================
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注意事项：
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Notes:
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================================================================================
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