/**
  ******************************************************************************
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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  * Copyright (C) 2021 Shanghai Eastsoft Microelectronics Co., Ltd. ALL rights reserved.
  *******************************************************************************
  */

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Version history:
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2023-6-2	V1.00	AE TEAM

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Demo introduction:
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本示例功能：将内部Ldo1.66v输出到PB2(AIN15)，ADC采样AIN15后，反推当前的参考电压（本列参考电压为VDD），
变量g_adc_result参考电压值，单位mV，通过串口打印输出。

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测试环境:
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测试用板；
ES-PDS-ES32F010xDB1

辅助工具：
ES-LinkII

辅助软件：
串口调试助手

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测试步骤：
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1) 编译工程，编译通过后用ES-LinkII将程序下载到目标芯片；
2) 打开串口调试助手(115200-1-N)，复位模板板，在串口调试助手上可查看当前ADC参考电压值

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注意：
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System clock:
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Internal HRC 32MHz

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Pin connection: 
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USART0_TX ---- PA13[GPIO_FUNC_3]
USART0_RX ---- PA14[GPIO_FUNC_3]
