嘉兴学院南湖学院本科生毕业设计
0xfd,0x92, //La 0xfd,0xd0, //Si 0xfd,0xee, //Do#
0x00,0x00 //音符之间的间隔，只要间隔时间小于65ms时，
//喇叭不会发出声音，用作拍子之间的短暂停顿
};
/*****生日快乐歌音调表*****/
unsigned char code shengri_tone[]={ 1,0,1,2,1,4,3,0, 1,0,1,2,1,5,4,0,
1,0,1,8,6,4,3,2,0, 7,0,7,6,4,5,4,0 //0代表不发声，即停顿；数字即为音调
};
/*****生日快乐歌节拍表*****/
unsigned char code shengri_beat[]={ 24,1,24,48,48,48,72,5, 24,1,24,48,48,48,72,5, 24,1,24,48,48,48,48,72,5, 24,1,24,48,48,48,72,5 //节拍，即tone表各音调的延时
};
/*****15ms延时子程序，用于节拍*****/ void delay(void) {
unsigned char n=15; while(n--) {
unsigned char i; for(i=0;i<125;i++); } }
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嘉兴学院南湖学院本科生毕业设计
/*****定时器0初始化*****/ void initTimer(void) {
TMOD=0x01; //定时器0，工作方式1;定时器1，工作方式1 TH0=tone1; TL0=tone2; }
/*****定时器0中断服务程序*****/ void timer0(void) interrupt 1 {
TH0=tone1; TL0=tone2;
SPK=~SPK; }
/*****演奏子程序1*****/ void play1(void) {
unsigned char m=0; unsigned char s; unsigned char a=1; while(1) {
EA=0; LED=0;
a=shengri_tone[m];
shumaguan=a;
s=shengri_beat[m]; tone1=yinfu[2*a-2]; tone2=yinfu[2*a-1]; EA=1; while(s--) {
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//取反，以产生方波 //取音符 //取节拍
嘉兴学院南湖学院本科生毕业设计
delay(); }
if((!K1)||(!K2)) //发现按键,立即退出播放
{
EA=0;SPK=0;shumaguan=0x00; m=34; return; } else
LED=1; m++;
if(m>=33) return; //数值是shengri相关表中的元素数量 } }
/*****按键检测*****/ void check_key(void) {
P2=0xff; P3=0xff; //设置为输入状态
switch(P2) //检测按键，输出数码管、载入定时器初值、允许中断
{
case0xfe:shumaguan=0x1;tone1=0xfb;tone2=0xe9;EA=1;break; case0xfd:shumaguan=0x2;tone1=0xfc;tone2=0x5c;EA=1;break; case0xfb:shumaguan=0x3;tone1=0xfc;tone2=0xc1;EA=1;break;
case0xf7:shumaguan=0x4;tone1=0xfc;tone2=0xef;EA=1;break; case0xef:shumaguan=0x5;tone1=0xfd;tone2=0x45;EA=1;break; case0xdf:shumaguan=0x6;tone1=0xfd;tone2=0x92;EA=1;break; case0xbf:shumaguan=0x7;tone1=0xfd;tone2=0xd0;EA=1;break; case0x7f:shumaguan=0x1;tone1=0xfd;tone2=0xee;EA=1;break;
default: EA=0;SPK=0;shumaguan=0x00;//没有键按下则关闭中断和数码管 } switch(P3) {
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嘉兴学院南湖学院本科生毕业设计
case 0xfb:play1();break; } }
/*****主程序*****/ void main(void) {
initTimer(); shumaguan=0x00; TR0=1; ET0=1; SPK=0; while(1) {
check_key(); } }
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