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 0,63628,63835,64021,64103,64260,64400,64524,0,0
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)
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
图4.22.2
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,#0FFH
CLR P3.4
MOV A,P3
ANL A,#0FH
XRL A,#0FH
JZ NOKEY1
LCALL DELY10MS
MOV A,P3
ANL A,#0FH
XRL A,#0FH
JZ NOKEY1
MOV A,P3
ANL A,#0FH
CJNE A,#0EH,NK1
MOV KEYBUF,#0
LJMP DK1
NK1: CJNE A,#0DH,NK2
MOV KEYBUF,#1
LJMP DK1
NK2: CJNE A,#0BH,NK3
MOV KEYBUF,#2
LJMP DK1
1NK3: CJNE A,#07H,NK4
MOV KEYBUF,#3
LJMP DK1
NK4: NOP
DK1:
MOV A,KEYBUF
MOV DPTR,#TABLE
MOVC A,@A+DPTR
MOV P0,A
MOV A,KEYBUF
MOV B,#2
MUL AB
MOV TEMP,A
MOV DPTR,#TABLE1
MOVC A,@A+DPTR
MOV STH0,A
MOV TH0,A
INC TEMP
MOV A,TEMP
MOVC A,@A+DPTR
MOV STL0,A
MOV TL0,A
SETB TR0
DK1A: MOV A,P3
ANL A,#0FH
XRL A,#0FH
JNZ DK1A
CLR TR0
NOKEY1:
MOV P3,#0FFH
CLR P3.5
MOV A,P3
ANL A,#0FH
XRL A,#0FH
JZ NOKEY2
LCALL DELY10MS
MOV A,P3
ANL A,#0FH
XRL A,#0FH
JZ NOKEY2
MOV A,P3
ANL A,#0FH
CJNE A,#0EH,NK5
MOV KEYBUF,#4
LJMP DK2
NK5: CJNE A,#0DH,NK6
MOV KEYBUF,#5
LJMP DK2
NK6: CJNE A,#0BH,NK7
MOV KEYBUF,#6
LJMP DK2
NK7: CJNE A,#07H,NK8
MOV KEYBUF,#7
LJMP DK2
NK8: NOP
DK2:
MOV A,KEYBUF
MOV DPTR,#TABLE
MOVC A,@A+DPTR
MOV P0,A
MOV A,KEYBUF
MOV B,#2
MUL AB
MOV TEMP,A
MOV DPTR,#TABLE1
MOVC A,@A+DPTR
MOV STH0,A
MOV TH0,A
INC TEMP
MOV A,TEMP
MOVC A,@A+DPTR
MOV STL0,A
MOV TL0,A
SETB TR0
DK2A: MOV A,P3
ANL A,#0FH
XRL A,#0FH
JNZ DK2A
CLR TR0
NOKEY2:
MOV P3,#0FFH
CLR P3.6
MOV A,P3
ANL A,#0FH
XRL A,#0FH
JZ NOKEY3
LCALL DELY10MS
MOV A,P3
ANL A,#0FH
XRL A,#0FH
JZ NOKEY3
MOV A,P3
ANL A,#0FH
CJNE A,#0EH,NK9
MOV KEYBUF,#8
LJMP DK3
NK9: CJNE A,#0DH,NK10
MOV KEYBUF,#9
LJMP DK3
NK10: CJNE A,#0BH,NK11
MOV KEYBUF,#10
LJMP DK3
NK11: CJNE A,#07H,NK12
MOV KEYBUF,#11
LJMP DK3
NK12: NOP
DK3:
MOV A,KEYBUF
MOV DPTR,#TABLE
MOVC A,@A+DPTR
MOV P0,A
MOV A,KEYBUF
MOV B,#2
MUL AB
MOV TEMP,A
MOV DPTR,#TABLE1
MOVC A,@A+DPTR
MOV STH0,A
MOV TH0,A
INC TEMP
MOV A,TEMP
MOVC A,@A+DPTR
MOV STL0,A
MOV TL0,A
SETB TR0
DK3A: MOV A,P3
ANL A,#0FH
XRL A,#0FH
JNZ DK3A
CLR TR0
NOKEY3:
MOV P3,#0FFH
CLR P3.7
MOV A,P3
ANL A,#0FH
XRL A,#0FH
JZ NOKEY4
LCALL DELY10MS
MOV A,P3
ANL A,#0FH
XRL A,#0FH
JZ NOKEY4
MOV A,P3
ANL A,#0FH
CJNE A,#0EH,NK13
MOV KEYBUF,#12
LJMP DK4
NK13: CJNE A,#0DH,NK14
MOV KEYBUF,#13
LJMP DK4
NK14: CJNE A,#0BH,NK15
MOV KEYBUF,#14
LJMP DK4
NK15: CJNE A,#07H,NK16
MOV KEYBUF,#15
LJMP DK4
NK16: NOP
DK4:
MOV A,KEYBUF
MOV DPTR,#TABLE
MOVC A,@A+DPTR
MOV P0,A
MOV A,KEYBUF
MOV B,#2
MUL AB
MOV TEMP,A
MOV DPTR,#TABLE1
MOVC A,@A+DPTR
MOV STH0,A
MOV TH0,A
INC TEMP
MOV A,TEMP
MOVC A,@A+DPTR
MOV STL0,A
MOV TL0,A
SETB TR0
DK4A: MOV A,P3
ANL A,#0FH
XRL A,#0FH
JNZ DK4A
CLR TR0
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
TABLE: DB 3FH,06H,5BH,4FH,66H,6DH,7DH,07H
DB 7FH,6FH,77H,7CH,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;
unsigned 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;i>0;i--)
for(j=200;j>0;j--);
temp=P3;
temp=temp & 0x0f;
if (temp!=0x0f)
{
temp=P3;
temp=temp & 0x0f;
switch(temp)
{
case 0x0e:
key=0;
break;
case 0x0d:
key=1;
break;
case 0x0b:
key=2;
break;
case 0x07:
key=3;
break;
}
temp=P3;
P1_0=~P1_0;
P0=table[key];
STH0=tab[key]/256;
STL0=tab[key]%6;
TR0=1;
temp=temp & 0x0f;
while(temp!=0x0f)
{
temp=P3;
temp=temp & 0x0f;
}
TR0=0;
}
}
P3=0xff;
P3_5=0;
temp=P3;
temp=temp & 0x0f;
if (temp!=0x0f)
{
for(i=50;i>0;i--)
for(j=200;j>0;j--);
temp=P3;
temp=temp & 0x0f;
if (temp!=0x0f)
{
temp=P3;
temp=temp & 0x0f;
switch(temp)
{
case 0x0e:
key=4;
break;
case 0x0d:
key=5;
break;
case 0x0b:
key=6;
break;
case 0x07:
key=7;
break;
}
temp=P3;
P1_0=~P1_0;
P0=table[key];
STH0=tab[key]/256;
STL0=tab[key]%6;
TR0=1;
temp=temp & 0x0f;
while(temp!=0x0f)
{
temp=P3;
temp=temp & 0x0f;
}
TR0=0;
}
}
P3=0xff;
P3_6=0;
temp=P3;
temp=temp & 0x0f;
if (temp!=0x0f)
{
for(i=50;i>0;i--)
for(j=200;j>0;j--);
temp=P3;
temp=temp & 0x0f;
if (temp!=0x0f)
{
temp=P3;
temp=temp & 0x0f;
switch(temp)
{
case 0x0e:
key=8;
break;
case 0x0d:
key=9;
break;
case 0x0b:
key=10;
break;
case 0x07:
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