单片机课程设计电子音调发生器

1、 单片机课程设计实验报告电子音调发生器姓名： 日期： 2009年6月29日星期一目录（一）实验目的2（二）设计任务及要求2（三）工作原理及设计思路2（四）实现功能设计3（五）软件设计3（六）电路设计35（七）调试36（八）实验体会37（一）实验目的1 了解计算机发声原理。2 熟悉定时器和键盘扫描电路的工作原理及编程方法。（二）设计任务及要求利用实验平台上的开关k0-k7和蜂鸣器设计电子音调发生器，要求：1利用实验平台上开关k0-k7进行音调选择，即拨动不同的开关产生不同的音调，依次拨动K0K7，蜂鸣器发出1234567i八个音调。2编写2支歌曲，并可进行选择播放。（三）工作原理及设计思路音节由

2、不同频率的方波产生，音节与频率的关系如表1所示。要产生音频方波，只要算出某一音频的周期（1/频率），然后将此周期除以2，即为半周期的时间。利用计时器计时此半周期时间，每当计时到后就将输出方波的I/0反相，然后重复计时此半周期时间再对I/O反相，就可在I/O脚得到此频率的方波。在ZKS-03实验仪上，产生方波的I/O脚选用P1.7，通过跳线选择器JP1将单片机的P1.7与蜂鸣器的驱动电路相连。这样P1.7输出不同频率的方波，蜂鸣器便会发出不同的声音。另外，音乐的节拍是由延时实现的，如果1拍为0.4秒，1/4拍是0.1秒。只要设定延时时间，就可求得节拍的时间。延时作为基本延时时间，节拍值只能是它的

3、整数倍， 每个音节相应的定时器初值X可按下法计算： （1/2）*(1/f)=(12/fose)*(216-x)即 x=216-(fose/24f)其中f:音调频率，当晶振fose=11.0592MHz时，音节“1”相应的定时器初值为x,则可得x=63777D=F921H 其它的可同样求得。 表1 音调频率（Hz）X(HEX)1262F9212294F9E13330FA8C4349FAD85392FB686440FBE97494FC5Bi523FC8F（四）实现功能设计实现两个主要功能：电子琴与音乐播放；一个辅助功能：在液晶上显示相关信息。1、电子琴：4*4的矩阵16个按键，按键0实现两个功能的

4、切换，其余按键分别发出音调 低音5、6、7，中音1、2、3、4、5、6、7，高音1、2、3、4、5。发音的同时在液晶显示屏上显示出对应的音调。2、音乐播放：按键0实现两个功能的切换，按键1实现播放类型选择（单曲循环播放、所有循环播放），其余按键分别对应一首歌。目前已经有9首歌。播放的同时，在液晶上显示出歌名。（五）软件设计根据要实现的功能，流程图如下：开始系统初始化判断按键判断按键电子琴液晶显示录音调整时钟功能选择音乐#include <AT89X52.H>#include <intrins.h>#define nop _nop_() #define ucha

5、r unsigned char #define uint unsigned int#define PAI_BASE 15#define MUSIC_NUM 9#define SCAN_CYCLE 500#define BEEP P3_3/*液晶显示相关变量*/sbit LCD_RS = P27; sbit LCD_RW = P26;sbit LCD_EN = P25; static uchar th0_f; /在中断中装载的 T0 的值高 8 位static uchar tl0_f; /在中断中装载的 T0 的值低 8 位static timebuffer,Record_counter,Rec

6、ord_flag=0;static uchar key2,key=16,scounter=0,Record_time;static uchar s_musicCounter=0x00,s_tableCounter;bit Rplay_flag=0;bit K0_flag=0;bit Music_flag0;bit Music_flag=0;bit Freq_flag=0;bit disptime_flag=0;bit musicAutoFlag=0;/sbit BEEP = P3_3; /喇叭输出脚/延时子程序1void delay(int ms) int i; while(ms-) for(

7、i = 0; i< 250; i+) _nop_(); _nop_(); _nop_(); _nop_(); /*/* */*检查LCD忙状态 */*lcd_busy为1时，忙，等待。lcd-busy为0时,闲，可写指令与数据。 */* */*/bit lcd_busy() bit result; LCD_RS = 0; LCD_RW = 1; LCD_EN = 1; _nop_(); _nop_(); _nop_(); _nop_(); result = (bit)(P0&0x80); LCD_EN = 0; return result; /*/* */*写指令数据到LCD *

8、/*RS=L，RW=L，E=高脉冲，D0-D7=指令码。 */* */*/void lcd_wcmd(uchar cmd) while(lcd_busy(); LCD_RS = 0; LCD_RW = 0; LCD_EN = 0; _nop_(); _nop_(); P0 = cmd; _nop_(); _nop_(); _nop_(); _nop_(); LCD_EN = 1; _nop_(); _nop_(); _nop_(); _nop_(); LCD_EN = 0; /*/* */*写显示数据到LCD */*RS=H，RW=L，E=高脉冲，D0-D7=数据。 */* */*/void

9、lcd_wdat(uchar dat) while(lcd_busy(); LCD_RS = 1; LCD_RW = 0; LCD_EN = 0; P0 = dat; _nop_(); _nop_(); _nop_(); _nop_(); LCD_EN = 1; _nop_(); _nop_(); _nop_(); _nop_(); LCD_EN = 0; /*/* */* 设定显示位置 */* */*/void lcd_pos(uchar pos) lcd_wcmd(pos|0x80); /数据指针=80+地址变量/*/* */* LCD初始化设定 */* */*/void lcd_init

10、() delay(15); /等待LCD电源稳定 lcd_wcmd(0x38); /16*2显示，5*7点阵，8位数据 delay(5); lcd_wcmd(0x38); delay(5); lcd_wcmd(0x38); delay(5); lcd_wcmd(0x0c); /显示开，关光标 delay(5); lcd_wcmd(0x06); /移动光标 delay(5); lcd_wcmd(0x01); /清除LCD的显示内容 delay(5);/*/* */* 清屏子程序 */* */*/void lcd_clr() lcd_wcmd(0x01); /清除LCD的显示内容 delay(5)

11、;/静态显示字符串void lcd_string(char *strpoint) /*在当前显示位置显示LCD 字符串*/ register i=0;while(strpointi!=0) lcd_wdat(strpointi);i+;/*/*Constant Tables*/const char code c_music1=0x82,0x01,0x81,0x94,0x84, /*生日快乐歌*/ 0xb4,0xa4,0x04,0x82,0x01,0x81,0x94,0x84,0xc4,0xb4,0x04,0x82,0x01,0x81,0xf4,0xd4,0xb4,0xa4,0x94,0xe2,

12、0x01,0xe1,0xd4,0xb4,0xc4,0xb4,0x04,0x00;const char code c_music2=0x62, 0x52, /*两只蝴蝶*/ 0x64, 0x64, 0x02, 0x52, 0x62, 0x52, 0x44, 0x44, 0x04, 0x22, 0x42, 0x54, 0x52, 0x62, 0x52, 0x42, 0x22, 0x42, 0x14, 0x14, 0x04, 0x62, 0x52, 0x64, 0x64, 0x02, 0x52, 0x62, 0x52, 0x44, 0x44, 0x04, 0x22, 0x42, 0x54, 0x52

13、, 0x62, 0x52, 0x42, 0x22, 0x42, 0x54, 0x54, 0x04, 0x62, 0x82,0x84, 0x84, 0x02, 0x82, 0x92, 0x82,0x64, 0x64, 0x04, 0x52, 0x52,0x54, 0x52, 0x62, 0x52, 0x42, 0x22, 0x91, 0x41,0x42, 0x42, 0x44, 0x44, 0x44, 0x02, 0x82, 0x82, 0x92, 0xb2, 0xa2, 0xa2, 0x92, 0x64, 0x52, 0x62, 0x64, 0x64, 0x02, 0x62, 0x62, 0x

14、82, 0x94, 0x94, 0x02, 0x22, 0x62, 0x52, 0x54, 0x54, 0x04, 0x62, 0x82, 0x82, 0x62, 0x84, 0x02, 0xb2, 0xb2, 0xa2, 0x92, 0xa2, 0x64, 0x02, 0x92, 0x92, 0xa2, 0x92, 0x82, 0x62, 0x52, 0x52, 0x62, 0x52, 0x62, 0x84, 0x84, 0x02, 0x82, 0x82, 0x92, 0x92, 0x82, 0x62, 0x52, 0x52, 0x12, 0x12, 0x22, 0x44, 0x44, 0x

15、44, 0x44, 0x00;const char code c_music3=0x04, 0x42, 0x41, 0x51, 0x62, 0x62, 0x52, 0x41, 0x51, 0x54, 0x02, 0x41, 0x51, /*老鼠爱大米*/ 0x62, 0x62, 0x52, 0x42, 0x44, 0x02, 0x11, 0x21, 0x14, 0x11, 0x11, 0x21, 0x41, 0x44, 0x02, 0x42, 0x42, 0x42, 0x42, 0x41, 0x51, 0x54, 0x42, 0x51, 0x61, 0x62, 0x62, 0x82, 0x91

16、, 0x51, 0x54, 0x62, 0x51, 0x41, 0x42, 0x42, 0x52, 0x61, 0x81, 0x84, 0x02, 0x81, 0x81, 0x92, 0x41, 0x41, 0x42, 0x61, 0x01, 0x52, 0x42, 0x42, 0x51, 0x41, 0x44, 0x44, 0x44, 0x62, 0x61, 0x81, 0x82, 0x81, 0x81, 0x82, 0x81, 0x91, 0x94, 0x62, 0x52, 0x42, 0x42, 0x42, 0x51, 0x61, 0x64, 0x02, 0x61, 0x81, 0x82

17、, 0x82, 0x82, 0x91, 0xb1, 0xb2, 0x92, 0x82, 0x62,0x52, 0x42, 0x42, 0x22, 0x54, 0x02, 0x61, 0x81,0x82, 0x82, 0x81, 0x92, 0x81, 0x94, 0x62, 0x52, 0x42, 0x42, 0x42, 0x51, 0x61, 0x64, 0x02, 0x61, 0x81, 0x82, 0x82, 0x82, 0x91, 0xb1, 0xb2, 0x92, 0x82, 0x61, 0x51, 0x52, 0x52, 0x54, 0x54, 0x41, 0x62, 0x71,

18、0x62, 0x52, 0x54, 0x54, 0x62, 0x51, 0x41, 0x44, 0x62, 0x51, 0x41, 0x44, 0x62, 0x52, 0x62, 0x42, 0x62, 0x91, 0x81, 0x84, 0x02, 0x61, 0x81, 0x92, 0x91, 0x81, 0x82, 0x91, 0x81, 0x84, 0x61, 0x51, 0x42, 0x52, 0x51, 0x61, 0x52, 0x41, 0x51, 0x41, 0x53, 0x62, 0x51, 0x41, 0x44, 0x62, 0x51, 0x41, 0x44, 0x62,

19、0x52, 0x62, 0x42, 0x61, 0x92, 0x81, 0x84, 0x02, 0x61, 0x81, 0x92, 0x92, 0xb2, 0x81, 0x91, 0x82, 0x01, 0x81, 0x61, 0x51, 0x41, 0x54, 0x51, 0x41, 0x51, 0x61, 0x54, 0x62, 0x62, 0x54, 0x02, 0x42, 0x44, 0x44, 0x00;const char code c_music4=0x04, 0x02, 0x41, 0x51, 0x62, 0x61, 0x61, 0x62, 0x52, /*梦醒时分*/ 0x6

20、2, 0x81, 0x61, 0x62, 0x61, 0x81, 0x92, 0x92, 0x92, 0xa2, 0x82, 0x62, 0x62, 0x62, 0x61, 0x51, 0x42, 0x41, 0x41, 0x42, 0x22, 0x62, 0x81, 0x41, 0x44, 0x51, 0x52, 0x01, 0x52, 0x42, 0x81, 0x61, 0x52, 0x52, 0x41, 0x51, 0x62, 0x61, 0x61, 0x62, 0x52, 0x62, 0x81, 0x61, 0x62, 0x61, 0x81, 0x92, 0x91, 0x91, 0x9

21、2, 0xa2, 0x82, 0x62, 0x61, 0x81, 0x81, 0x81, 0x92, 0xb2, 0xb2, 0x92, 0x72, 0x52, 0x52, 0x81, 0x81, 0x92, 0xb2, 0xb2, 0x92, 0xb2, 0xc2, 0xc4, 0xc4, 0x01, 0x81, 0x81, 0x81, 0xd2, 0xd2, 0xd2, 0xd2, 0xd2, 0xc1, 0xc1, 0xc2, 0xb1, 0xa1, 0xb2, 0xb2, 0xb2, 0xc2, 0x62, 0x82, 0x82, 0x81, 0x81, 0x92, 0xb1, 0xb

22、1, 0xb2, 0xb2, 0xc2, 0x91, 0xb1, 0xb2, 0xb1, 0xb1, 0xc2, 0xc1, 0xc1, 0xc2, 0xb2, 0xd2, 0xc1, 0x81, 0x81, 0x81, 0x81, 0x81, 0xd2, 0xd2, 0xd2, 0xf2, 0xd2, 0xc1, 0xc1, 0xc2, 0xb1, 0xa1, 0xb2, 0xb2, 0xb2, 0xc2, 0x62, 0x82, 0x82, 0x81, 0x81, 0x92, 0xb1, 0xb1, 0xb2, 0xb1, 0xb1, 0xc2, 0x91, 0xb1, 0xb2, 0xb

23、1, 0xb1, 0xc2, 0xc1, 0xc1, 0xc2, 0xb2, 0xd4, 0xc2, 0x01, 0xb1, 0xb4, 0xb4, 0xb4, 0xb4, 0x00;const char code c_music5=0x54, 0x64, 0x64, /*大长今*/ 0x64, 0x02, 0x52, 0x44, 0x24, 0x44, 0x44, 0x51, 0x43, 0x44, 0x44, 0x54, 0x64, 0x64, 0x64, 0x02, 0x82, 0x64, 0x64, 0x54, 0x64, 0x64, 0x64, 0x64, 0x84, 0x94, 0

24、x94, 0x94, 0x84, 0x64, 0x64, 0x84, 0x94, 0x81, 0x91, 0x82, 0x84, 0x84, 0x54, 0x64, 0x64, 0x54, 0x02, 0x62, 0x64, 0x54, 0x64, 0x24, 0x41, 0x23, 0x94, 0x94, 0x24, 0x24, 0x24, 0x54, 0x64, 0x64, 0x64, 0x02, 0x52, 0x44, 0x24, 0x44, 0x44, 0x51, 0x43, 0x44, 0x44, 0x54, 0x64, 0x64, 0x64, 0x02, 0x82, 0x64, 0

25、x64, 0x54, 0x64, 0x64, 0x64, 0x64, 0x84, 0x94, 0x94, 0x94, 0x02, 0x82, 0x64, 0x64, 0x84, 0x94, 0x84, 0x84, 0x84, 0x54, 0x64, 0x64, 0x54, 0x02, 0x62, 0x64, 0x54, 0x64, 0x24, 0x41, 0x23, 0x24, 0x24, 0x24, 0x24, 0x24, 0x54, 0x02, 0x42, 0x24, 0x54, 0x02, 0x42, 0x24, 0x54, 0x64, 0x44, 0x54, 0x02, 0x62, 0

26、x84, 0x94, 0x02, 0x82, 0x64, 0x54, 0x02, 0x42, 0x24, 0x24, 0x14, 0x24, 0x41, 0x23, 0x24, 0x24, 0x24, 0x24, 0x24, 0x14, 0x14, 0x14, 0x14, 0x02, 0x22, 0x42, 0x52, 0x62, 0x52, 0x44, 0x02, 0x22, 0x44, 0x44, 0x54, 0x64, 0x64, 0x64, 0x64, 0x64, 0x84, 0x94, 0x02, 0xb2, 0x94, 0x84, 0x84, 0x84, 0x84, 0x61, 0

27、x81, 0x92, 0x04, 0x92, 0x82, 0x64, 0x02, 0x52, 0x64, 0x02, 0x52, 0x62, 0x52, 0x44, 0x44, 0x44, 0x41, 0x23, 0x24, 0x44, 0x54, 0x54, 0x54, 0x54, 0x64, 0x64, 0x44, 0x41, 0x23, 0x24, 0x24, 0x24, 0x24, 0x00;const char code c_music6=0x24, 0x42, 0x52, 0x64, 0x62, 0x92, /*漫步人生路*/ 0x84, 0x62, 0x52, 0x64, 0x0

28、2, 0x62, 0x72, 0x62, 0x62, 0x52, 0x52, 0x42, 0x41, 0x31, 0x22, 0x44, 0x02, 0x52, 0x34, 0x34, 0x24, 0x42, 0x52, 0x64, 0x62, 0x92, 0xa4, 0x82, 0x62, 0x64, 0x02, 0x62, 0x72, 0x62, 0x52, 0x42, 0x32, 0x42, 0x52, 0x62, 0x42, 0x32, 0x22, 0x12, 0x24, 0x24, 0x42, 0x32, 0x42, 0x52, 0x64, 0x52, 0x62,0x74, 0x74

29、, 0x72, 0x81, 0x71, 0x62, 0x52, 0x64, 0x74, 0x84, 0x02, 0x62, 0x94, 0x92, 0x82, 0x94, 0x92, 0xb2, 0x92, 0x82, 0x82, 0x92, 0x64, 0x52, 0x42, 0x54, 0x52, 0x42, 0x54, 0x42, 0x42, 0x82, 0x62, 0x62, 0x52, 0x42, 0x34, 0x62, 0x62, 0x94, 0x92, 0x82, 0x94, 0x92, 0xb2, 0x92, 0x82, 0x82, 0x92, 0x64, 0x52, 0x42

30、, 0x54, 0x42, 0x82, 0x64, 0x52, 0x42, 0x52, 0x61, 0x51, 0x42, 0x32, 0x24, 0x24, 0x00;const char code c_music7=0x02, 0x12, 0x12, 0x22, /*最浪漫的事*/ 0x44, 0x42, 0x42, 0x42, 0x22, 0x22, 0x62, 0x64, 0x64, 0x02, 0x12, 0x24, 0x42, 0x42, 0x42, 0x42, 0x44, 0x62, 0x82, 0x84, 0x84, 0x84, 0x02, 0x82, 0x92, 0x82, 0x92, 0x82, 0x94, 0x82, 0x51, 0x61, 0x62, 0x51, 0x41, 0x44, 0x02, 0x42, 0x42, 0x22, 0x44, 0x42, 0x22, 0x42, 0x64, 0x52, 0x5