/**
  ******************************************************************************
  * 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
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  * Copyright (C) 2021 Shanghai Eastsoft Microelectronics Co., Ltd. ALL rights reserved.
  *******************************************************************************
  */

<--------------------------------------------------------------------------------
Version history:
--------------------------------------------------------------------------------->
2021-3-16	V1.0.0	AE TEAM

<--------------------------------------------------------------------------------
Demo introduction:
--------------------------------------------------------------------------------->
本示例功能：电池和市电同时供电的系统，市电供电时系统全速运行。LVD监测到市电掉电后
立即切换到电池供电，MCU也进入休眠状态，STOP与SLEEP的唤醒端口为PA6。LVD监测到市电恢
复系统立即进入全速运行状态。
<--------------------------------------------------------------------------------
测试环境:
--------------------------------------------------------------------------------->
测试用板；
ES-PDS-ES32F010xDB1

辅助工具：
多功能接口转换工具ESBridge

辅助软件：
ESBridge上位机软件

<--------------------------------------------------------------------------------
测试步骤：
--------------------------------------------------------------------------------->
1) 编译工程，编译通过后将程序下载到目标芯片；
2) 将测试用板对应的VDD和GND引脚分别连接到ESBridge的VCC和GND；
3) 将测试用板与ESLINK2的连接断开，由ESBridge供电
4) 将SW1开关打向BAT一侧
5) 按下测试用板的RESET键
6) 上位机切换到功耗检测标签页，选择“开始”进行功耗监测；
7) LVD检测电源电压高于3.6V：MCU全速运行。PA15持续电平翻转；
8) LVD检测电源电压低于3.6V: MCU进入低功耗状态，PA6产生上升沿，MCU唤醒，对PA15进行
一次电平翻转后MCU继续进入低功耗状态；
<--------------------------------------------------------------------------------
注意：
--------------------------------------------------------------------------------->
1) 测试板与ESBridge需共GND。

<--------------------------------------------------------------------------------
System clock:
--------------------------------------------------------------------------------->
Internal HRC 32MHz

<--------------------------------------------------------------------------------
Pin connection: 
--------------------------------------------------------------------------------->
PMU_EXTI     ---- PA6[GPIO_FUNC_1]
LED          ---- PA15[GPIO_FUNC_1]
