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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TIM1的编码器接口模式。TIM1配置为编码器接口模式3，PA8和PA9配置为通道1
和通道2,当PA8输入信号的上升沿在前，PA9输入信号上升沿在后时TIM1向上计数，反之向下
计数。开启通道1和通道2的捕获中断，在中断中打印当前CNT值。

Function descriptions:
This sample demonstrates the encoder interface mode of TIM1. TIM1 is configured 
in encoder interface mode 3, with PA8 and PA9 configured as channel 1 and 
channel 2, respectively. When the rising edge of the input signal on PA8 occurs 
before the rising edge of the input signal on PA9, TIM1 counts up; otherwise, 
it counts down. The capture interrupts for channel 1 and channel 2 are enabled, 
and the current CNT value is printed in the interrupt.
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测试环境：
测试用板：PY32F403_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: PY32F403_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. 编译下载程序到MCU，并运行
2. 在PA8和PA9输入相位不同的脉冲
3. 连接串口打印当前计数值（不断累加或递减，由输入脉冲时序决定）

Example execution steps:
1.Compile and download the program to the MCU, and then run it.
2.Input pulse signals with different phases on PA8 and PA9.
3.Connect a serial port to print the current count value (it will increment 
or decrement based on the timing of the input pulses).
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注意事项：
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；
STK板        USB转TTL模块
PA02(TX)  -->  RX
PA03(RX)  -->  TX
GND       -->  GND

Notes:
The PC is connected to the STK board through the USB-to-TTL module. The 
connection between the STK board and the USB-to-TTL module is as follows
STK board USB to TTL module
PA02(TX)  -->  RX
PA03(RX)  -->  TX
GND       -->  GND
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