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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DAC的软件触发功能,通道PA4能够输出1/2的供电电压值。

Function descriptions:
This example demonstrates the software triggering function of DAC,channel PA4
can output 1/2 of the power supply voltage value.
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测试环境：
测试用板：PY32F403_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: PY32F403_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. 测量PA4，PA4输出1.65V电压(VCC供电电压为3.3V)。

Example execution steps:
1. Compile and download the program;
2. Measure PA4, PA4 outputs a voltage of 1.65V (VCC supply voltage is 3.3V)
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注意事项：
如果需要使用按键:
StartKit版本为V2.0以下,需将StartKit.h中的StartKitVersion 2 注释掉，并打开
StartKitVersion 1
StartKit版本为V2.0及以上版本,则无需操作
请注意部分型号不支持DAC，具体型号参考数据手册

Notes:
If you need to use buttons:
StartKit version is below V2.0, you need to comment StartKitVersion 2 in
StartKit.h, and open StartKitVersion 1 
StartKit version is V2.0 and above, no operation is required
Please note that some models do not support DAC. Please refer to the data manual 
for specific models

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