电子琴
C语言源程序 #include <AT89X51.H> 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]%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) { 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]%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) { 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; P0=table[key]; 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) { 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; P0=table[key]; STH0=tab[key]/256; STL0=tab[key]%256; TR0=1; temp=temp & 0x0f; while(temp!=0x0f) { temp=P3; temp=temp & 0x0f; } TR0=0; } } } } void t0(void) interrupt 1 using 0 { TH0=STH0; TL0=STL0; P1_0=~P1_0; } | |
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