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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的自动波特率检测功能。调试助手发送一个字符0x7F，MCU反馈字符
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串：Auto BaudRate Test。
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Function descriptions:
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This sample demonstrates the automatic baud rate detection feature of USART.
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When the debugging assistant sends a character 0x7F, the MCU will respond with
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the string: "Auto BaudRate Test".
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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9600；
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4. 调试助手发送一个字符0x7F，MCU反馈字符串：Auto BaudRate Test；
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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
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COM port with the baud rate set to 9600;
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4. The debugging assistant sends a character 0x7F, and the MCU responds with
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the string "Auto BaudRate Test";
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================================================================================
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注意事项：
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1. 不注释掉宏AUTO_BAUD_MODE0（main.c中），上位机发送1字节的波特率检测0x7F，如果
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MCU检测成功，返回字符：Auto BaudRate Test
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2. 注释掉宏AUTO_BAUD_MODE0（main.c中），上位机发送1字节的波特率检测0x55，如果MCU
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检测成功，返回字符：Auto BaudRate Test
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Notes:
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1. If the AUTO_BAUD_MODE0 macro is not commented out (in main.c), when the host
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computer sends a 1-byte baud rate detection signal 0x7F, the MCU will respond
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with the string: "Auto BaudRate Test".
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2. If the AUTO_BAUD_MODE0 macro is commented out (in main.c), when the host
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computer sends a 1-byte baud rate detection signal 0x55, the MCU will respond
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with the string: "Auto BaudRate Test".
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================================================================================
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