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Version history:
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2021-3-16	V1.00	AE TEAM
2022-7-27	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：I2C从机收发，中断方式。

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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：
多功能接口转换工具ES-DAPLink(ES-Bridge)

辅助软件：
ES-Bridge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) 点击“写读数据”，上位机写入芯片数据并存在g_recv_buf里，再将g_recv_buf读出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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External HOSC[12MHz] divided by 3, then PLL to 72MHz.

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Pin connection: 
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SCL ---- PB10[GPIO_FUNC_5]
SDA ---- PB11[GPIO_FUNC_5]