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                                样例使用说明
                             Sample Description
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功能描述：
此样例演示某一EPWM触发其他EPWM同步以及移相功能。

Function descriptions:
This sample demonstrates the synchronization and phase-shifting functionality
where one EPWM triggers other EPWMs.

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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、PA8和PC12引脚上的信号,三引脚上输出相同周期，占空比均为
50%的信号，EPWM1计数器值为0的时候触发EPWM2和EPWM3同步，观察到PA8和PC12引脚上
的信号相位同步无偏差；

Example execution steps:
1.Compile and download the program.
2.Use a logic analyzer to capture the signals on pins PC6, PA8, and PC12. All
three pins output signals with the same period and 50% duty cycle. When the
counter value of EPWM1 reaches 0, it triggers the synchronization of EPWM2
and EPWM3. It can be observed that the signals on pins PA8 and PC12 are
phase-synchronized with no phase deviation.

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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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