熊绪胜硬件课程设计报告 - 华中科技大学电子与信息工程系.doc

基于MSP430的电子琴
硬件课程设计
个人报告
项目名称: 基于MSP430的电子琴

姓名: 熊绪胜
姓名: 电信提高0901班
学号: U200913668
指导教师: 汪小燕老师
2012 年 7 月 5 日

课题名称:基于MSP430的电子琴
【摘要】本次课程设计基于MSP430设计一个电子琴装置,该装置能产生不同的音调,对应电子琴的各个琴键的声音。通过按键能够控制音调的各个属性, 例如音阶、音量、节拍等,以模拟电子琴的参数设置,同时该装置具有播放一整段乐曲的功能。
电子琴的每个乐音对应不同频率的声音信号,我们的思路是利用MSP430的DAC转换电路将预先设定的乐谱信息转化成对应频率的音频信号输出到扬声器,通过矩阵键盘的中断控制DAC的各个参数,从而调节每个音调的属性,以模拟出设置音阶、音量、节拍的功能。
通过编程手段可以达到连续DAC转换输出连续不同的音调,这样就能播放一整段的乐曲。DAC模块输出的信号是很稳定、纯净的但音频信号,能保证乐音的音质清晰,但由于DAC转换的信号比较微弱,所以通过一个功率放大器,可以调节声音大小,完成音量调节的设计。
【关键词】: MSP430 电子琴界面
[Abstract] The course design is based on the MSP430 design a keyboard device, the device can produce a different tone, corresponding to the sound of keyboard keys. The button can control the pitch of each property, such as scale, volume, tempo and other parameters to simulate the keyboard settings, the device has a function to play a whole section of music.
The keyboard music corresponding to the signals of different frequencies of sound, our idea is that the DAC conversion circuit using the MSP430 will be pre-set music information into the corresponding frequency of the audio signal output to the speaker through the matrix of the keyboard interrupt control various parameters of the DAC , thereby regulating the properties of each pitch to simulate the function of a set of scales, volume, tempo.
Can be achieved by programming means consecutive DAC conversion output for different tone, so you can play a whole song. The DAC module output signal is very stable, pure audio signal to ensure the sound quality of the music is clear, DAC conversion signal is relatively weak, so a power amplifier, you can adjust the loudness of sound, complete the design volume adjustment.
目录
基于MSP430的电子琴 1
硬件课程设计 1
个人报告 1
4
MSP-FET430UIF简介 5
poser S) 6
6
实现的基本功能 6
7
7
7
7
8
项目综述 9
5. 系统软件设计与实现 9
键盘扫描模块 9
LCD显示模块 16
音阶调节模块 19
22
测试结果 22
遇到问题 24
7