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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EPWM互补输出刹车功能，跳闸区子模块根据输入信号电平对 AQ 生成的 PWM 波
形电平进行强制设置。

Function descriptions:
This sample demonstrates the EPWM complementary output braking function.
The trip zone submodule forcibly sets the PWM waveform level generated by AQ
based on the input signal level.  

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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. 从PA0引脚输入高低电平，通过逻辑分析仪捕捉PC6和PC7引脚上的信号，当PA0输入高电平，
PC6和PC7引脚正常输出互补信号，当PA0输入低电平，PC6和PC7引脚均输出低电平；

Example execution steps:
1.Compile and download the program.
2.Apply high or low level input to pin PA0, and capture the signals on pins PC6
and PC7 using a logic analyzer. When a high level is input at PA0, pins PC6 and
PC7 normally output complementary signals. When a low level is input at PA0,
both pins PC6 and PC7 output low levels.

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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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