/**
  ******************************************************************************
  * 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
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  * 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.
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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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2021-3-16       V1.0.0      AE TEAM

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Demo introduction:
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本示例功能：I2C主机收发，通过DMA转存数据。

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测试环境:
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测试用板；
ES-PDS-ES32H040XLQ-V1.0

辅助工具：
多功能接口转换工具ES-DAPLink(ES-Bridge)

辅助软件：
ESBridge上位机软件

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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) 将程序配置的SCL/SDA对应的引脚分别连接ES-DAPLink(ES-Bridge)的SCL/SDA；
3) ES-DAPLink(ES-Bridge)通过USB线缆连接PC，打开上位机软件，“设备操作”选项里选择“打开”；
4) 上位机切换到I2C标签页，按照程序配置参数（主机模式-7bit地址模式-400kHz时钟频率-0x2D从机地址），点击打开；
5) 在线调试，将g_recv_buf加入监视窗，运行程序；
6) 在写数据对话框输入20字节HEX数据，读字节数设置为20；
7) 运行程序，MCU作为I2C主机读取ES-DAPLink(ES-Bridge)的数据存入g_recv_buf，同时将g_recv_buf复制到g_send_buf,
   MCU再把g_send_buf的数据写入ES-DAPLink(ES-Bridge)，并显示在上位机软件上。

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注意：
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1) 测试板与ES-DAPLink(ES-Bridge)需共GND。

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System clock:
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PLL 48MHz

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Pin connection: 
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I2C1_SCL ----- PB10
I2C1_SDA ----- PB11