131 lines
2.5 KiB
C
131 lines
2.5 KiB
C
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sbit beep=P1^0; //连接扬声器
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sbit up=P1^1; //升调键
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sbit down=P1^2; //降调键
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sbit play=P3^2; //播放键，中断
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sbit led=P1^3; //指示灯
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unsigned char CurFreHigh=0x00; //当前频率对应的定时器值-高字节
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unsigned char CurFreLow=0x00; //当前频率对应的定时器值-低字节
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unsigned char temp=0x00; //存储当前按键值，无变化则不重装定时器
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unsigned char fre, len; //播放时的音高，音长
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unsigned char PlayIndex; //用于中断切歌
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unsigned char Playing; //当前播放音乐的序号
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unsigned char key=0; //获取按键值
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void delay(unsigned char i)
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{
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unsigned char j,k;
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while(i--)
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{
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j=0xFF;
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while(j--)
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{
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k=0x20;
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while(k--) if(PlayIndex!=Playing) return;
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}
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}
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}
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void Play(unsigned char index)
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{
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unsigned int i=0; //播放第一曲
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if(index==2) i+=68; //第二曲
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if(index==3) i+=218; //第三曲
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if(index==4) i+=606; //第四曲
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if(index==5) i+=684; //第五曲
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if(index==6) //进入待机
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{
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led=0;
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delay(1);
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led=1;
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delay(2);
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led=0;
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delay(1);
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led=1;
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delay(2);
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led=0;
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beep=1;
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PCON=0x02;
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}
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while(1)
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{
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if(index!=PlayIndex) break;
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fre=music[i++];
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len=music[i++];
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CurFreHigh=FreqTabHigh[fre];
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CurFreLow=FreqTabLow[fre];
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TH0=CurFreHigh;
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TL0=CurFreLow;
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TR0=1;
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if(len==0x00)
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{
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// PlayIndex=0;
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// Playing=0;
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break;
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}
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delay(len);
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TR0=0;
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}
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TR0=0;
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}
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void InitInt() //初始化中断
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{
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TMOD=0x01;
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IT0=1;
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IE=0x83;
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}
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void sound(unsigned char i) //判断是否升降调并播放按键对应的音阶
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{
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up=down=1;
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if((up)&&(!down)) i-=12;
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if((!up)&&(down)) i+=12;
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CurFreHigh=FreqTabHigh[i];
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CurFreLow=FreqTabLow[i];
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TH0=CurFreHigh;
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TL0=CurFreLow;
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TR0=1;
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}
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void Int0() interrupt 0 //播放键按下时
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{
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delay(5);
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led=1;
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PlayIndex=(PlayIndex+1)%7;
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}
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void Timer0() interrupt 1
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{
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TH0=CurFreHigh;
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TL0=CurFreLow;
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if(CurFreLow) beep=~beep;
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}
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void keydown() //扫描按键值
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{
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P2=0xC0;
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key=0;
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if(P2!=0xC0)
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{
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P2=0xC0;
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switch(P2)
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{
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case(0x40): key=1; break;
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case(0x80): key=2; break;
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}
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P2=0x3F;
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switch(P2)
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{
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case(0x1F): break;
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case(0x2F): key+=2;break;
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case(0x37): key+=4;break;
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case(0x3B): key+=6;break;
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case(0x3D): key+=8;break;
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case(0x3E): key+=10;break;
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}
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}
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}
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