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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ADC模块的Vrefint采样功能， ， ，
通过串口打印出来。
Function descriptions:
This example demonstrates the Vrefint sampling function of the ADC module. By
sampling the value of Vrefint, the VCC value is calculated and printed through
the serial port.
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测试环境：
测试用板：
MDK版本：
IAR版本：
GCC 版本：
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. 编译下载程序到MCU， ；
2. 串口每隔1s打印VCC的电压值。
Example execution steps:
1. Compile and download the program and run it;
2. The serial port prints the voltage value of the VCC every 1 second.
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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；
STK板 USB转TTL模块
PA02(TX) --> RX
PA03(RX) --> TX
GND --> GND
Notes:
Connect the PC to the STK board through the USB to TTL module, the connection
between the STK board and the USB to TTL module is as follows:
STK board USB to TTL module
PA02(TX) --> RX
PA03(RX) --> TX
GND --> GND
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