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                                样例使用说明
                             Sample Description
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功能描述：
此样例演示了使用TIM1 PWM2模式输出三路频率为10Hz占空比分别为25%、50%、75%的PWM波
形。

Function descriptions:
This example demonstrates the use of TIM1 PWM2 mode to output three PWM waves 
with a frequency of 10Hz and a duty cycle of 25%, 50% and 75%, respectively.
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测试环境：
测试用板：PY32F072_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: PY32F072_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. 使用逻辑分析仪观察引脚PA8/PA9/PA10的波形

Example execution steps:
1.Compile and download the program to the MCU and run it.
2. Use the logic analyzer to observe the waveform of pin PA8/PA9/PA10
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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
PA8  -> CH1  占空比：75%
PA9  -> CH2  占空比：50%
PA10 -> CH3  占空比：25%

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
PA8  -> CH1  Duty cycle: 75%
PA9  -> CH2  Duty cycle: 50%
PA10 -> CH3  Duty cycle: 25%
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