/**
  ******************************************************************************
  * 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.
  *******************************************************************************
  */

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Version history:
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2021-03-16	V1.00	AE TEAM
2022-07-17	V1.01	AE TEAM
1.适配ES-PDS-ES32F3696LX开发板

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Demo introduction:
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本示例功能：读取按键端口的高低电平，如果为高电平则输出到LED端口高电平，如果为低电
平则输出到LED端口低电平。

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测试环境:
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测试用板：
ES-PDS-ES32F3696LX-V1.0

辅助工具：


辅助软件：


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测试步骤：
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1) 编译工程，编译通过后将程序下载到目标芯片；
2) 在线调试，运行程序；
3) 按下按键和松开按键的时候LED端口电平会相应翻转。

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注意：
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System clock:
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外部HOSC 12MHz 3分频后PLL倍频到72MHz.

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Pin connection: 
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KEY  ---- PF7[GPIO_FUNC_1]
LED  ---- PC8[GPIO_FUNC_1]

