【正文】 選 delay_50us(2)。 //開外部中斷1中斷 EA=1。j0。另外，我還在焊接單片機(jī)電路的過程中，學(xué)到了許多焊接方面的知識與技巧。 //P0口送數(shù)據(jù) P2=0x07。 if(temp2 == count)//節(jié)拍 { count = 0。 }}void timer0init(void) { TMOD = 0x01。 }} 播放及顯示程序分析音樂播放的過程，其為不同頻率聲音的組合，當(dāng)一組恰當(dāng)頻率聲音組合按照一定的先后順序與節(jié)拍播放時，即可產(chǎn)生音樂。 //每組解碼后的值存入ircode } irprocok=1。 ET0=1。圖33 紅外信號脈沖寬度圖上述“0”和“1”組成的32位二進(jìn)制碼經(jīng)38kHz的載頻進(jìn)行二次調(diào)制以提高發(fā)射效率，達(dá)到降低電源功耗的目的。除非E1和E2置低且E3置高，否則74HC138將保持所有輸出為高。這就大大占用了處理器的處理時間，消耗了處理器的處理能力，還浪費了處理器的功耗。(2)外部時鐘方式。播放電路主要用蜂鳴器來播放不同的音樂曲目。本設(shè)計利用AT89S52單片機(jī)及少數(shù)外圍電路控制音樂播放，產(chǎn)生兩首不同的歌曲。主要采用單片機(jī)為控制核心，以紅外信號為通信手段，通信蜂鳴器發(fā)聲，來完成音樂播放器的功能。有規(guī)律的振動發(fā)出的聲音叫“樂音”。本設(shè)計中使用常見的家用紅外遙控器進(jìn)行控制，使用其中的2兩個數(shù)字鍵（對應(yīng)功能選擇2兩首歌曲），音量加、減兩個按鍵（對應(yīng)功能上一曲、下一曲），頻道加、減兩個按鍵（對應(yīng)功能暫停、結(jié)束播放），以及確定鍵（對應(yīng)功能播放歌曲）。單片機(jī)的時鐘可由兩種方式產(chǎn)生，即內(nèi)部時鐘方式和外部時鐘方式。所以數(shù)據(jù)信號應(yīng)該滿足載波信號的頻率盡量接近帶通濾波器的中心頻率（38KHZ）；脈沖長度在300us以上；數(shù)據(jù)的編碼類型相兼容。 緩沖寄存器又稱緩沖器，它分輸入緩沖器和輸出緩沖器兩種。首先進(jìn)行正確的紅外解碼，然后根據(jù)解碼后的鍵值進(jìn)行播放歌曲與顯示按鍵值。 //碼組位數(shù)unsigned char irreceok。j4。 } irdata[bitnum]=irtime。unsigned char code song[] ={ //祝你平安0x26,0x20,0x20,0x20,0x20,0x20,0x26,0x10,0x20,0x10,0x20,0x80,0x26,0x20,0x30,0x20,0x30,0x20,0x39,0x10,0x30,0x10,0x30,0x80,0x26,0x20,0x20,0x20,0x20,0x20,0x1c,0x20,0x20,0x80,0x2b,0x20,0x26,0x20,0x20,0x20,0x2b,0x10,0x26,0x10,0x2b,0x80,0x26,0x20,0x30,0x20,0x30,0x20,0x39,0x10,0x26,0x10,0x26,0x60,0x40,0x10,0x39,0x10,0x26,0x20,0x30,0x20,0x30,0x20,0x39,0x10,0x26,0x10,0x26,0x80,0x26,0x20,0x2b,0x10,0x2b,0x10,0x2b,0x20,0x30,0x10,0x39,0x10,0x26,0x10,0x2b,0x10,0x2b,0x20,0x2b,0x40,0x40,0x20,0x20,0x10,0x20,0x10,0x2b,0x10,0x26,0x30,0x30,0x80,0x18,0x20,0x18,0x20,0x26,0x20,0x20,0x20,0x20,0x40,0x26,0x20,0x2b,0x20,0x30,0x20,0x30,0x20,0x1c,0x20,0x20,0x20,0x20,0x80,0x1c,0x20,0x1c,0x20,0x1c,0x20,0x30,0x20,0x30,0x60,0x39,0x10,0x30,0x10,0x20,0x20,0x2b,0x10,0x26,0x10,0x2b,0x10,0x26,0x10,0x26,0x10,0x2b,0x10,0x2b,0x80,0x18,0x20,0x18,0x20,0x26,0x20,0x20,0x20,0x20,0x60,0x26,0x10,0x2b,0x20,0x30,0x20,0x30,0x20,0x1c,0x20,0x20,0x20,0x20,0x80,0x26,0x20,0x30,0x10,0x30,0x10,0x30,0x20,0x39,0x20,0x26,0x10,0x2b,0x10,0x2b,0x20,0x2b,0x40,0x40,0x10,0x40,0x10,0x20,0x10,0x20,0x10,0x2b,0x10,0x26,0x30,0x30,0x80,0x00, //八月桂花遍地開0x18,0x30,0x1C,0x10,0x20,0x40,0x1C,0x10,0x18,0x10,0x20,0x10,0x1C,0x10,0x18,0x40,0x1C,0x20,0x20,0x20,0x1C,0x20,0x18,0x20,0x20,0x80,0xFF,0x20,0x30,0x1C,0x10,0x18,0x20,0x15,0x20,0x1C,0x20,0x20,0x20,0x26,0x40,0x20,0x20,0x2B,0x20,0x26,0x20,0x20,0x20,0x30,0x80,0xFF,0x20,0x20,0x1C,0x10,0x18,0x10,0x20,0x20,0x26,0x20,0x2B,0x20,0x30,0x20,0x2B,0x40,0x20,0x20,0x1C,0x10,0x18,0x10,0x20,0x20,0x26,0x20,0x2B,0x20,0x30,0x20,0x2B,0x40,0x20,0x30,0x1C,0x10,0x18,0x20,0x15,0x20,0x1C,0x20,0x20,0x20,0x26,0x40,0x20,0x20,0x2B,0x20,0x26,0x20,0x20,0x20,0x30,0x80,0x20,0x30,0x1C,0x10,0x20,0x10,0x1C,0x10,0x20,0x20,0x26,0x20,0x2B,0x20,0x30,0x20,0x2B,0x40,0x20,0x15,0x1F,0x05,0x20,0x10,0x1C,0x10,0x20,0x20,0x26,0x20,0x2B,0x20,0x30,0x20,0x2B,0x40,0x20,0x30,0x1C,0x10,0x18,0x20,0x15,0x20,0x1C,0x20,0x20,0x20,0x26,0x40,0x20,0x20,0x2B,0x20,0x26,0x20,0x20,0x20,0x30,0x30,0x20,0x30,0x1C,0x10,0x18,0x40,0x1C,0x20,0x20,0x20,0x26,0x40,0x13,0x60,0x18,0x20,0x15,0x40,0x13,0x40,0x18,0x80,0x00}。 if (temp1 == 0xFF) //休止符 { TR0 = 0。 //送往數(shù)碼管的數(shù)void irwork(void) //把解碼后的數(shù)據(jù)轉(zhuǎn)成16進(jìn)制的兩位數(shù){ disp[0]=ircode[2]/16。(5) 按下頻道“+”，對應(yīng)碼值02，數(shù)碼管顯示02，蜂鳴器暫停播放曲目2。 //解碼后數(shù)據(jù)uchar disp[2]。 //定時器0 定時方式2 8位自動重裝 TH0=0x00。 //解碼數(shù)據(jù)為1 則高位或1 則高位置1 } k++。 //中斷計數(shù)清0 addr = l * 217。 //關(guān)閉位選 if(temp2 == count) //節(jié)拍 { count = 0。 } if(ircode[2]==0x0aamp。 return。 } if(ircode[2]==0x17amp。 //返回主函數(shù)播放qumu[n] } } if(ircode[2]==0x05amp。 play(qumu[0])。 bitnum++。 irreceok=1。 play(qumu[0])。shuaxin==1) //播放下一曲 { if(l==0) //當(dāng)前播放曲目0 { shuaxin=0。shuaxin==1) //曲目0 { shuaxin=0。 n=0。shuaxin==1) //停止播放 { shuaxin=0。 } } } if(irreceok) //接收完成 { irproc()。 if (temp1 == 0xFF) //休止符 { TR0 = 0。 //每組解碼后的值存入ircode } irprocok=1。 ET0=1。 //曲目數(shù)組unsigned char code song[] ={ //祝你平安0x26,0x20,0x20,0x20,0x20,0x20,0x26,0x10,0x20,0x10,0x20,0x80,0x26,0x20,0x30,0x20,0x30,0x20,0x39,0x10,0x30,0x10,0x30,0x80,0x26,0x20,0x20,0x20,0x20,0x20,0x1c,0x20,0x20,0x80,0x2b,0x20,0x26,0x20,0x20,0x20,0x2b,0x10,0x26,0x10,0x2b,0x80,0x26,0x20,0x30,0x20,0x30,0x20,0x39,0x10,0x26,0x10,0x26,0x60,0x40,0x10,0x39,0x10,0x26,0x20,0x30,0x20,0x30,0x20,0x39,0x10,0x26,0x10,0x26,0x80,0x26,0x20,0x2b,0x10,0x2b,0x10,0x2b,0x20,0x30,0x10,0x39,0x10,0x26,0x10,0x2b,0x10,0x2b,0x20,0x2b,0x40,0x40,0x20,0x20,0x10,0x20,0x10,0x2b,0x10,0x26,0x30,0x30,0x80,0x18,0x20,0x18,0x20,0x26,0x20,0x20,0x2