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Version history:
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2019-10-29	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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通过Shell设置、读取日期/时间/闹钟等参数，具体指令格式参考串口助手打印的内容；闹钟中断响应后系统进入低功耗模式，8秒后RTC唤醒系统。

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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TX/RX引脚分别连接ES-DAPLink(ES-Bridge)的RX/TX；
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UART标签页，配置参数(115200-1-8-无-正常模式)，勾选发送新行，打开串口；
5) 在线调试或复位运行程序，上位机接收框会打印指令模板；
6) 参照模板，发送指令，设置日期、时间和闹钟，读取当前时间，接收框打印对应信息；
7) 当RTC运行到闹钟匹配时间时，系统进入低功耗模式，Shell指令暂时失效，RTC仍正常运行，8s后RTC唤醒系统，Shell功能恢复。

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注意：
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1) 测试板与ES-DAPLink(ES-Bridge)需共GND；
2) 上位机发送指令需勾选“发送新行”选项。

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System clock:
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HRC 24MHz divided by 6, then PLL to 48MHz.

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Pin connection: 
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UART1 TX PC0
UART1 RX PC1