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                                样例使用说明
                             Sample Description
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功能描述：
此样例演示了通过轮询方式计算sin、cos的值。


Function descriptions:
This example demonstrates calculating the values of sin and cos through polling.
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测试环境：
测试用板：PY32M031_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: PY32M031_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. 程序运行后，观察打印的sin、cos值（sin(PI/6) = 1/2，cos(PI/6) = 0.866）

Example execution steps:
1. compile and download the program to MCU and run it;
2. After the program runs, observe the printed sin and cos values
   (sin (PI/6)=1/2, cos (PI/6)=0.866)
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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
PA02(TX)  -->  RX
PA03(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 PC and STK board through USB to TTL module and the connection method
is as follows
@PrintfConfigStart
STK board    USB to TTL moudle
PA02(TX)  -->  RX
PA03(RX)  -->  TX
GND      -->  GND
UART is configured as BaudRate 115200, data bit 8, stop bit 1, and parity None.
@PrintfConfigEnd
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