================================================================================
                                样例使用说明
                             Sample Description
================================================================================
功能描述：
此样例演示EPWM外部信号触发不同EPWM同步以及移相功能。

Function descriptions:
This sample demonstrates the external signal-triggered synchronization and
phase-shifting functions of different EPWMs.

================================================================================
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
================================================================================
使用步骤：
1. 编译并下载程序；
2. 通过逻辑分析仪捕捉PC6和PA8引脚上的信号,两引脚上输出相同周期，占空比均为50%的
信号，PA0引脚未输入同步触发脉冲前，两信号相位未同步；
3. 从PA0引脚输入同步触发脉冲，通过逻辑分析仪捕捉PC6和PA8引脚上的信号，观察到此时
PC6和PA8引脚上的信号发生同步，且两信号相位相差60°；
4. 通过改变LL_EPWM_SetPhaseShift(EPWM2, (100 - 1)*60U/360U);中的60U，可以改变
移相比例；

Example execution steps:
1.Compile and download the program.
2.Use a logic analyzer to capture the signals on pins PC6 and PA8. Both pins
output signals with the same period and 50% duty cycle. Before a synchronization
trigger pulse is applied to pin PA0, the phases of the two signals are not
synchronized.
3.Apply a synchronization trigger pulse to pin PA0. Use a logic analyzer to
capture the signals on pins PC6 and PA8. It can be observed that the signals
on these two pins become synchronized, with a 60° phase difference between them.
4.By modifying the value of 60U in the function call
LL_EPWM_SetPhaseShift(EPWM2, (100 - 1)*60U/360U), the phase shift ratio can
be adjusted.
================================================================================
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
================================================================================