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在原有基础上添加了闹钟设置，当设置好闹钟时，需要打开闹钟开关，闹钟开关打开时，在首屏上会有闹钟标志显示。
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java book with lot of example
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arm开发优化指南源代码2，arm开发人员的参考宝典。
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a very good book about programming Embedded system in C
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