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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EPWM 输出基本 PWM 信号功能，动作限定(AQ)子模块根据设置好的周期、比较
器的值生成不同占空比的PMW信号。

Function descriptions:
This sample demonstrates the basic PWM signal output function of EPWM.
The Action Qualifier (AQ) submodule generates PWM signals with different duty
cycles based on the configured period and comparator values.

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测试环境：
测试用板：PY32F420_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: PY32F420_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. 通过逻辑分析仪捕捉PC6、PC7引脚的电平，PC6引脚上信号占空比为25%，PC7引脚上信号
占空比为75%；

Example execution steps:
1.Compile and download the program.
2.Use a logic analyzer to monitor the signal levels on pins PC6 and PC7.
Verify that the signal on pin PC6 has a 25% duty cycle, while the signal on pin
PC7 has a 75% duty cycle.

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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；
@PrintfConfigStart
STK板        USB转TTL模块
PA2(TX)  -->  RX
PA3(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:
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
PA2(TX)  -->  RX
PA3(RX)  -->  TX
GND       -->  GND
UART is configured as BaudRate 115200, data bit 8, stop bit 1, and parity None.
@PrintfConfigEnd
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