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目 录
一、设计电子琴的作用与目的 .....................................................................................................1
二、电子琴设计要求 .....................................................................................................................1
三、电子琴设计所用设备及软件 .................................................................................................2
四、电子琴系统设计方案 .............................................................................................................2
五、电子琴系统硬件设计 .............................................................................................................3
5.1 琴键控制电路 ...................................................................................................................3
5.1.1 矩阵式键盘 .............................................................................................................3
5.1.2 独立式键盘 .............................................................................................................4
5.1.3 方案比较 .................................................................................................................4
5.2 数码管显示电路 ...............................................................................................................5
5.2.1 LED 数码管显示原理 ..........................................................................................5
5.2.2 LED 数码管静态显示 ..........................................................................................5
5.2.3 LED 数码管动态显示 ..........................................................................................6
5.2.4 方案比较 .................................................................................................................7
5.3 音频功放电路 ...................................................................................................................7
5.4 时钟-复位电路..................................................................................................................8
5.4.1 时钟电路 .................................................................................................................8
5.4.2 复位电路 .................................................................................................................8
5.5 电源电路 ...........................................................................................................................9
5.6 整体电路 .........................................................................................................................10
六、电子琴系统软件设计 ...........................................................................................................10
6.1 系统硬件接口定义 .........................................................................................................10
6.2 主函数 .............................................................................................................................10
6.3 初始化函数 .....................................................................................................................11
6.4 数码管显示函数 .............................................................................................................11
6.5 中断函数 .........................................................................................................................11
6.6 键值扫描函数 .................................................................................................................12
6.7 音频处理函数 .................................................................................................................13
七、电子琴设计调试 ...................................................................................................................14
7.1 调试工具 .........................................................................................................................14
7.2 调试结果 .........................................................................................................................14
7.3 电子琴设计中的问题及解决方法 .................................................................................15
八、电子琴设计总结 ...................................................................................................................15
参考文献 .......................................................................................................................................17
附录 1:电子琴系统原理图 ........................................................................................................18
附录 2:源程序 ............................................................................................................................19