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                                样例使用说明
                                Sample Description
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功能描述：
此样例演示了USART的自动波特率检测功能,上位机发送1字节的波特率检测字符0x55，如果
MCU检测成功，则返回字符：Auto BaudRate Test。

Function descriptions:
This example demonstrates the automatic baud rate detection function of USART.
If the MCU detects successfully after the upper computer sends 1 byte baud rate
detection character 0x55, it will returns the string: Auto BaudRate Test.
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测试环境：
测试用板：PY32F002B_STK
MDK版本： 5.28
IAR版本： 9.20
GCC 版本：GNU Arm Embedded Toolchain 10.3-2021.10

Test environment:
Test board: PY32F002B_STK
MDK Version: 5.28
IAR Version: 9.20
GCC Version: GNU Arm Embedded Toolchain 10.3-2021.10
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使用步骤：
1. 编译并下载程序到MCU；
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；
@PrintfConfigStart
STK板        USB转TTL模块
PB4(TX)  -->  RX
PB5(RX)  -->  TX
GND      -->  GND
UART配置为波特率9600，数据位8，停止位1，校验位None
@PrintfConfigEnd
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。
4. 调试助手发送一个字符0x55，MCU反馈字符串：Auto BaudRate Test；

Example execution steps:
1. compile and download the program to MCU and run it;
2. Connect the PC to the STK board through the USB to TTL module, and the connection
method between the STK board and the USB to TTL module is as follows:
@PrintfConfigStart
STK board USB to TTL module
PB4(TX)  -->  RX
PB5(RX)  -->  TX
GND      -->  GND
UART is configured as BaudRate 9600, data bit 8, stop bit 1, and parity None.
@PrintfConfigEnd
3. Open the serial port Assistant on the PC, connect the COM port correctly, and
set the baud rate to 9600.
4. Send a character 0x55 using the serial assistant. The MCU will return the 
string "Auto BaudRate Test".
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注意事项：
如果需要使用按键:
StartKit版本为V1.0,需将StartKit.h中的StartKitVersion 2 注释掉，并打开
StartKitVersion 1
StartKit版本为V1.0以上版本,则无需操作

Notes:
If you need to use buttons:
StartKit version is V1.0, please comment out StartKitVersion 2 in StartKit.h and 
open StartKitVersion 1
If the StartKit version is above V1.0, no operation is required

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