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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的斩波功能，斩波器子模块使用高频载波信号对 AQ 生成的 PWM 波形进
行调制。

Function descriptions:
This sample demonstrates the chopping function of EPWM. The chopper submodule
modulates the PWM waveform generated by AQ using a high-frequency carrier signal.

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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. 下载并运行程序
2. 通过逻辑分析仪捕捉PC6通道的电平，判断pwm输出信号是否正确

Example execution steps:
1.Compile and download the program.
2.Use a logic analyzer to capture the signal level on channel PC6 and determine
whether the PWM output signal is correct.

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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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