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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 输出高分辨率 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，同时使用高分辨率(HR)功能精细定位边沿。

Function descriptions:
This sample demonstrates the high-resolution PWM signal output capability of
EPWM. The Action Qualifier (AQ) submodule generates PWM signals with varying
duty cycles based on configured period and comparator values, while utilizing
the high-resolution (HR) feature to achieve precise edge positioning.

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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通道的电平，观察输出PWM信号相较于AQ子模块输出的基本PWM信
号上升沿推后了1/120MHz*(127/255)= 4ns

Example execution steps:
1.Compile and download the program.
2.Use a logic analyzer to capture the signal level on channel PC6 and observe
that the output PWM signal has a rising edge delayed by 1/120MHz*(127/255)= 4ns
compared to the basic PWM signal generated by the AQ submodule.

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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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