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                                样例使用说明
                             Sample Description
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功能描述：
此样例演示了采用CAN2.0协议、扩展帧、外部回环的轮询方式与PCAN-View的通信功能，MCU
首先自动发送8byte数据0x1~0x8，MCU接收到数据后，自动将接收到数据通过串口打出。

Function descriptions:
This example demonstrates the communication function with PCAN-View using the
CAN2.0 protocol, extended frames, and external loopback polling method. The MCU
first automatically sends 8-byte data 0x1~0x8, and after receiving the data, the
MCU automatically prints the received data through the serial port.
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测试环境：
测试用板：PY32F072E_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: PY32F072E_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；
2. 将CAN_RX（PB8）与CAN_TX（PB9）短接；
3. 复位STK板，观察串口是否打印8byte数据0x1~0x8，如果串口打印，表明外部回环模式
测试成功。

Example execution steps:
1.Compile and download the program;
2.Connect CAN_RX (PB8) and CAN_TX (PB9) short circuit;
3.Reset the STK board and observe whether the serial port prints 8byte data
0x1~0x8. If the serial port prints, it indicates that the external loopback
mode test is successful.
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注意事项：
如果需要使用按键:
StartKit版本为V2.0以下,需将StartKit.h中的StartKitVersion 2 注释掉，并打开
StartKitVersion 1
StartKit版本为V2.0及以上版本,则无需操作
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
PA02(TX)  -->  RX
PA03(RX)  -->  TX
GND       -->  GND
UART配置为波特率115200，数据位8，停止位1，校验位None
@PrintfConfigEnd

Notes:
If you need to use buttons:
StartKit version is below V2.0, you need to comment StartKitVersion 2 in
StartKit.h, and open StartKitVersion 1 
StartKit version is V2.0 and above, no operation is required
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
PA02(TX)  -->  RX
PA03(RX)  -->  TX
GND       -->  GND
UART is configured as BaudRate 115200, data bit 8, stop bit 1, and parity None.
@PrintfConfigEnd
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