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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输出三路频率为10Hz占空比分别为25%、50%、75%的PWM波形以及他们
的互补信号，并实现了250ns的死区和刹车功能。

Function descriptions:
This sample demonstrates the generation of three PWM waveforms with 
frequencies of 10Hz and duty cycles of 25%, 50%, and 75% using TIM1. 
It also generates their complementary signals. It also generates their 
complementary signals and implements a 250ns dead-time and brake function.
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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. 将PA6引脚接低电平。
3. 使用逻辑分析仪观察引脚PA7/PA8/PA9/PA10/PB4/PB5的波形；
4. 将PA6引脚接高电平，PWM停止输出。

Example execution steps:
1.Compile and download the program to the MCU, and then run it.
2.Set pin PA6 to the low logic level.
3.Use a logic analyzer to observe the waveforms on pins PA7/PA8/PA9/PA10/PB4/PB5.
4.Set pin PA6 to a high logic level to stop PWM output.
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注意事项：
PA8  -> CH1  占空比：25%
PA9  -> CH2  占空比：50%
PA10 -> CH3  占空比：75%
PA7  -> CH1N
PB4  -> CH2N
PB5  -> CH3N

Notes:
PA8 -> CH1 Duty cycle: 25%
PA9 -> CH2 Duty cycle: 50%
PA10 -> CH3 Duty cycle: 75%
PA7 -> CH1N
PB4 -> CH2N
PB5 -> CH3N
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