1、64934 #2 RE# 311 63928 中 6 LA 880 64968 低 3 M 330 64021 # 6 932 64994 低 4 FA 349 64103 中 7 SI 988 65030 370 64185 高 1 DO 1046 65058 低 5 SO 392 64260 # 1 DO# 1109 65085 415 64331 高 2 RE 1175 65110 低 6 LA 440 64400 # 2 RE# 1245 65134 466 64463 高 3 M 1318 65157 低 7 SI 494 64524 高 4 FA 1397 65178 中 1 DO
2、 523 64580 1480 65198 554 64633 高 5 SO 1568 65217 中 2 RE 587 64684 1661 65235 622 64732 高 6 LA 1760 65252 中 3 M 659 64777 1865 65268 中 4 FA 698 64820 高 7 SI 1967 65283 下面我们要为这个音符建立一个表格,有助于单片机通过查表的方式来获得相应的数据 低音 0 19 之间,中音在 20 39 之间,高音在 40 59 之间 TABLE: DW 0,63628,63835,64021,64103,64260,64400,64524,0,
3、0 DW 0,63731,63928,0,64185,64331,64463,0,0,0 DW 0,64580,64684,64777,64820,64898,64968,65030,0,0 DW 0,64633,64732,0,64860,64934,64994,0,0,0 DW 0,65058,65110,65157,65178,65217,65252,65283,0,0 DW 0,65085,65134,0,65198,65235,65268,0,0,0 DW 0 2 、音乐的音拍,一个节拍为单位( C 调) 曲调值 DELAY 调 4/4 125ms 62ms 调 3/4 187ms
4、94ms 调 2/4 250ms 对于不同的曲调我们也可以用单片机的另外一个定时 / 计数器来完成。下面就用 AT89S51 单片机产生一首“生日快乐”歌曲来说明单片机如何产生的。在这个程序中用到了两个定时 / 计数器来完成的。其中 T0 用来产生音符频率, T1 用来产生音拍。5 程序框图 6 汇编源程序 KEYBUF EQU 30H STH0 EQU 31H STL0 EQU 32H TEMP EQU 33H ORG 00H LJMP START ORG 0BH LJMP INT_T0 START: MOV TMOD,#01H SETB ET0 SETB EA WAIT:MOV P3,#0
5、FFH CLR P3.4 MOV A,P3 ANL A,#0FH XRL A,#0FH JZ NOKEY1 LCALL DELY10MS CJNE A,#0EH,NK1 MOV KEYBUF,#0 LJMP DK1 NK1: CJNE A,#0DH,NK2 MOV KEYBUF,#1 NK2: CJNE A,#0BH,NK3 MOV KEYBUF,#2 NK3: CJNE A,#07H,NK4 MOV KEYBUF,#3 NK4: NOP DK1:MOV A,KEYBUF MOV DPTR,#TABLE MOVC A,A+DPTR MOV P0,A MOV B,#2 MUL AB MOV TE
6、MP,A MOV DPTR,#TABLE1 MOV STH0,A MOV TH0,A INC TEMP MOV A,TEMP MOV STL0,A MOV TL0,A SETB TR0 DK1A: MOV A,P3 JNZ DK1A CLR TR0 NOKEY1:CLR P3.5 JZ NOKEY2 CJNE A,#0EH,NK5 MOV KEYBUF,#4 LJMP DK2 NK5: CJNE A,#0DH,NK6 MOV KEYBUF,#5 NK6: CJNE A,#0BH,NK7 MOV KEYBUF,#6 NK7: CJNE A,#07H,NK8 MOV KEYBUF,#7 NK8:D
7、K2:DK2A:JNZ DK2A NOKEY2:CLR P3.6 JZ NOKEY3 CJNE A,#0EH,NK9 MOV KEYBUF,#8 LJMP DK3 NK9: CJNE A,#0DH,NK10 MOV KEYBUF,#9 NK10: CJNE A,#0BH,NK11 MOV KEYBUF,#10 NK11: CJNE A,#07H,NK12 MOV KEYBUF,#11 NK12:DK3:DK3A:JNZ DK3A NOKEY3:CLR P3.7 JZ NOKEY4 CJNE A,#0EH,NK13 MOV KEYBUF,#12 LJMP DK4 NK13: CJNE A,#0D
8、H,NK14 MOV KEYBUF,#13 NK14: CJNE A,#0BH,NK15 MOV KEYBUF,#14 NK15: CJNE A,#07H,NK16 MOV KEYBUF,#15 NK16:DK4:DK4A:JNZ DK4A NOKEY4:LJMP WAIT DELY10MS:MOV R6,#10 D1: MOV R7,#248 DJNZ R7,$ DJNZ R6,D1 RET INT_T0:MOV TH0,STH0 MOV TL0,STL0 CPL P1.0 RETI DB 3FH,06H,5BH,4FH,66H,6DH,7DH,07H DB 7FH,6FH,77H,7CH,
9、39H,5EH,79H,71H TABLE1: DW 64021,64103,64260,64400 DW 64524,64580,64684,64777 DW 64820,64898,64968,65030 DW 65058,65110,65157,65178 END 7 C 语言源程序 include unsigned char code table=0x3f,0x06,0x5b,0x4f, 0x66,0x6d,0x7d,0x07, 0x7f,0x6f,0x77,0x7c, 0x39,0x5e,0x79,0x71;unsigned char temp;unsigned char key;u
10、nsigned char i,j;unsigned char STH0;unsigned char STL0;unsigned int code tab=64021,64103,64260,64400, 64524,64580,64684,64777, 64820,64898,64968,65030, 65058,65110,65157,65178;void main(void) TMOD=0x01;ET0=1;EA=1;while(1) P3=0xff;P3_4=0;temp=P3;temp=temp & 0x0f;if (temp!=0x0f) for(i=50;i0;i-) for(j=
11、200;jj-);switch(temp) case 0x0e:key=0;break;case 0x0d:key=1;case 0x0b:key=2;case 0x07:key=3; P1_0=P1_0;P0=tablekey;STH0=tabkey/256;STL0=tabkey%256;TR0=1;while(temp!TR0=0;P3_5=0;key=4;key=5;key=6;key=7;P3_6=0;key=8;key=9;key=10;key=11;P3_7=0;key=12;key=13;key=14;key=15;void t0(void) interrupt 1 using 0 TH0=STH0;TL0=STL0;unsigned char code music_tab =0x30, 0x2B, 0x26 , 0x10, /格式为: 频率常数, 节拍常数, 频率常数, 节拍常数,0x20, 0x1C, 0x18 , 0x18,;
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