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#include<reg51.h> sbit P14=P1^4; sbit P15=P1^5; sbit P16=P1^6; sbit P17=P1^7; unsigned char keyval; sbit sound=P3^7; unsigned int C; unsigned int f; #define l_dao 262 #define l_re 286 #define l_mi 311 #define l_fa 349 #define l_sao 392 #define l_la 440 #define l_xi 494 #define dao 523 #define re 587 #define mi 659 #define fa 698 #define sao 784 #define la 880 #define xi 987 #define h_dao 1046 #define h_re 1174 #define h_mi 1318 #define h_fa 1396 #define h_sao 1567 #define h_la 1760 #define h_xi 1975 void delay20ms(void) { unsigned char i,j; for(i=0;i<100;i++) for(j=0;j<60;j++) } void delay() { unsigned char i,j; for(i=0;i<250;i++) for(j=0;j<250;j++) ; } void Output_Sound(void) { C=(46083/f)*10; TH0=(8192-C)/32; TL0=(8192-C)%32; TR0=1; delay(); TR0=0; sound=1; keyval=0xff; } void main(void) { EA=1; ET0=1; ET1=1; TR1=1; TMOD=0x10; TH1=(65536-500)/256; TL1=(65536-500)%256; while(1) { switch(keyval) { case 1:f=dao; Output_Sound(); break; case 2:f=l_xi; Output_Sound(); break; case 3:f=l_la; Output_Sound(); break; case 4:f=l_sao; Output_Sound(); break; case 5:f=sao; Output_Sound(); break; case 6:f=fa; Output_Sound(); break; case 7:f=mi; Output_Sound(); break; case 8:f=re; Output_Sound(); break; case 9:f=h_re; Output_Sound(); break; case 10:f=h_dao; Output_Sound(); break; case 11:f=xi; Output_Sound(); break; case 12:f=la; Output_Sound(); break; case 13:f=h_la; Output_Sound(); break; case 14:f=h_sao; Output_Sound(); break; case 15:f=h_fa; Output_Sound(); break; case 16:f=h_mi; Output_Sound(); break; } } } void Time0_serve(void ) interrupt 1 using 1 { TH0=(8192-C)/32; TL0=(8192-C)%32; sound=!sound; } void time1_serve(void) interrupt 3 using 2 { TR1=0; P1=0xf0; if((P1&0xf0)!=0xf0) { delay20ms(); if((P1&0xf0)!=0xf0) { P1=0xfe; if(P14==0) keyval=1; if(P15==0) keyval=2; if(P16==0) keyval=3; if(P17==0) keyval=4; P1=0xfd; if(P14==0) keyval=5; if(P15==0) keyval=6; if(P16==0) keyval=7; if(P17==0) keyval=8; P1=0xfb; if(P14==0) keyval=9; if(P15==0) keyval=10; if(P16==0) keyval=11; if(P17==0) keyval=12; P1=0xf7; if(P14==0) keyval=13; if(P15==0) keyval=14; if(P16==0) keyval=15; if(P17==0) keyval=16; } } TR1=1; TH1=(65536-500)/256; TL1=(65536-500)%256; }
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