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#include <AT89X51.H> void key1(); unsigned char temp; unsigned char key; unsigned char i; unsigned char j; unsigned char STH0; unsigned char STL0; unsigned char dis; unsigned int code tab[]= {64021,64103,64260,64400, 64524,64580,64684,64777, 64820,64898,64968,65030, 65058,65110,65157,65178}; unsigned char code table[]= //共阳极 { 0xc0,0xf9,0xa4,0xb0, 0x99,0x92,0x82,0xf8, 0x80,0x90,0x88,0x83, 0xc6,0xa1,0x86,0x8e, 0xbf}; void main(void){ TMOD=0x01; ET0=1; EA=1; while(1){P0=table[dis]; dis=key; P3=0xff; key1(); } } void t0(void) interrupt 1 using 0 { //定时器T0中断服务函数 TH0=STH0; TL0=STL0; P1_0=~P1_0; //产生方波 } void key1() { P3_4=0; temp=P3; temp=temp & 0x0f; if (temp!=0x0f) { //从第一行开始扫描键盘 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; STH0=tab[key]/256; //计算音符对应的定时器计数值 STL0=tab[key]%256; 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){ //扫描键盘第二行 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; STH0=tab[key]/256; STL0=tab[key]%256; 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){ //扫描键盘第三行 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: key=11; break; } temp=P3; P1_0=~P1_0; STH0=tab[key]/256; STL0=tab[key]%256; TR0=1; temp=temp & 0x0f; while(temp!=0x0f){ temp=P3; temp=temp & 0x0f; } TR0=0; } } P3=0xff; P3_7=0; temp=P3; temp=temp & 0x0f; if (temp!=0x0f){ //扫描键盘第四行 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=12; break; case 0x0d: key=13; break; case 0x0b: key=14; break; case 0x07: key=15; break; } temp=P3; P1_0=~P1_0; STH0=tab[key]/256; STL0=tab[key]%256; TR0=1; temp=temp & 0x0f; while(temp!=0x0f){ temp=P3; temp=temp & 0x0f; } TR0=0; } } }