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- void Play(unsigned char *Sound,unsigned char Signature,unsigned Octachord,unsigned int Speed)
- {
- unsigned int NewFreTab[12]; //新的頻率表
- unsigned char i,j;
- unsigned int Point,LDiv,LDiv0,LDiv1,LDiv2,LDiv4,CurrentFre,Temp_T,SoundLength;
- unsigned char Tone,Length,SL,SH,SM,SLen,XG,FD;
- for(i=0;i<12;i++) // 根據調號及升降八度來生成新的頻率表
- {
- j = i + Signature;
- if(j > 11)
- {
- j = j-12;
- NewFreTab[i] = FreTab[j]*2;
- }
- else
- NewFreTab[i] = FreTab[j];
- if(Octachord == 1)
- NewFreTab[i]>>=2;
- else if(Octachord == 3)
- NewFreTab[i]<<=2;
- }
-
- SoundLength = 0;
- while(Sound[SoundLength] != 0x00) //計算歌曲長度
- {
- SoundLength+=2;
- }
- Point = 0;
- Tone = Sound[Point];
- Length = Sound[Point+1]; // 讀出第一個音符和它時時值
-
- LDiv0 = 12000/Speed; // 算出1分音符的長度(幾個10ms)
- LDiv4 = LDiv0/4; // 算出4分音符的長度
- LDiv4 = LDiv4-LDiv4*SOUND_SPACE; // 普通音最長間隔標準
- TR0 = 0;
- TR1 = 1;
- while(Point < SoundLength&&K1==1) //歌曲代碼未放完且暫停鍵未被按下
- {
- SL=Tone%10; //計算出音符
- SM=Tone/10%10; //計算出高低音
- SH=Tone/100; //計算出是否升半
- CurrentFre = NewFreTab[SignTab[SL-1]+SH]; //查出對應音符的頻率
- if(SL!=0)
- {
- if (SM==1) CurrentFre >>= 2; //低音
- if (SM==3) CurrentFre <<= 2; //高音
- Temp_T = 65536-(50000/CurrentFre)*10/(12000000/SYSTEM_OSC);//計算計數器初值
- Sound_Temp_TH0 = Temp_T/256;
- Sound_Temp_TL0 = Temp_T%256;
- TH0 = Sound_Temp_TH0;
- TL0 = Sound_Temp_TL0 + 12; //加12是對中斷延時的補償
- }
- SLen=LengthTab[Length%10]; //算出是幾分音符
- XG=Length/10%10; //算出音符類型(0普通1連音2頓音)
- FD=Length/100;
- LDiv=LDiv0/SLen; //算出連音音符演奏的長度(多少個10ms)
- if (FD==1)
- LDiv=LDiv+LDiv/2;
- if(XG!=1)
- if(XG==0) //算出普通音符的演奏長度
- if (SLen<=4)
- LDiv1=LDiv-LDiv4;
- else
- LDiv1=LDiv*SOUND_SPACE;
- else
- LDiv1=LDiv/2; //算出頓音的演奏長度
- else
- LDiv1=LDiv;
- if(SL==0) LDiv1=0;
- LDiv2=LDiv-LDiv1; //算出不發音的長度
- if (SL!=0)
- {
- TR0=1;
- for(i=LDiv1;i>0;i--) //發規定長度的音
- {
- while(TF1==0);
- TH1 = Sound_Temp_TH1;
- TL1 = Sound_Temp_TL1;
- TF1=0;
- }
- }
- if(LDiv2!=0)
- {
- TR0=0; BeepIO=0;
- for(i=LDiv2;i>0;i--) //音符間的間隔
- {
- while(TF1==0);
- TH1 = Sound_Temp_TH1;
- TL1 = Sound_Temp_TL1;
- TF1=0;
- }
- }
- Point+=2;
- Tone=Sound[Point];
- Length=Sound[Point+1];
- }
- BeepIO = 0;
- }
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